{"id":20245,"date":"2023-11-02T10:08:15","date_gmt":"2023-11-02T04:38:15","guid":{"rendered":"https:\/\/apboardsolutions.in\/?p=20245"},"modified":"2023-11-03T17:43:08","modified_gmt":"2023-11-03T12:13:08","slug":"ap-7th-class-science-important-questions-9th-lesson","status":"publish","type":"post","link":"https:\/\/apboardsolutions.in\/ap-7th-class-science-important-questions-9th-lesson\/","title":{"rendered":"AP 7th Class Science Important Questions 9th Lesson Heat, Temperature and Climate"},"content":{"rendered":"

These AP 7th Class Science Important Questions<\/a> 9th Lesson Heat, Temperature and Climate will help students prepare well for the exams.<\/p>\n

AP Board 7th Class Science 9th Lesson Important Questions and Answers Heat, Temperature and Climate<\/h2>\n

Question 1.
\nWhat is heat?
\nAnswer:
\nHeat is a form of energy which flows from hotter body (higher energy) to cooler body (lower energy).<\/p>\n

Question 2.
\nHow is heat measured?
\nAnswer:
\nHeat is measured in Joules or calories with calorimeter.<\/p>\n

Question 3.
\nWhat is temperature?
\nAnswer:
\nThe degree of hotness or coldness is called temperature.<\/p>\n

Question 4.
\nHow do we call the variations of hotness, coldness?
\nAnswer:
\nThe variations of hotness, coldness can be termed as degree of hotness and coldness.<\/p>\n

\"AP<\/p>\n

Question 5.
\nWhat are the units of temperature?
\nAnswer:
\nTemperature is measured in degrees of Celsius, degrees of Fahrenheit or Kelvin using a thermometer.<\/p>\n

Question 6.
\nWhat is the SI unit of temperature?
\nAnswer:
\nThe SI unit of temperature is kelvin (K).<\/p>\n

Question 7.
\nWrite the different modes of transfer of heat?
\nAnswer:<\/p>\n

    \n
  1. Conduction of heat<\/li>\n
  2. Convection of heat<\/li>\n
  3. Radiation of heat.<\/li>\n<\/ol>\n

    Question 8.
    \nWhat is conduction?
    \nAnswer:
    \nThe process of transfer of heat from hotter to colder end through the conductor is called conduction.<\/p>\n

    Question 9.
    \nWhat is convection of heat?
    \nAnswer:
    \nThe process of transfer of heat from source of heat to surface by the motion of par\u00acticles is called \u201cconvection of heat\u201d.<\/p>\n

    Question 10.
    \nWhat is radiation of heat?
    \nAnswer:
    \nThe process of transfer of heat in the form of waves is called radiation.<\/p>\n

    Question 11.
    \nWhat is thermal contact?
    \nAnswer:
    \nThe contact which transfers heat by any mode is called Thermal contact.<\/p>\n

    \"AP<\/p>\n

    Question 12.
    \nWhat is the condition for conduction of heat?
    \n(OR)
    \nWhen does conduction take place?
    \nAnswer:
    \nConduction takes place, only when the conductor is in touch (contact) with the source of heat. The contact which transfers heat by any mode is called Thermal contact. Conduction doesn\u2019t take place without thermal contact.<\/p>\n

    Question 13.
    \nWhat are called convectional currents?
    \nAnswer:
    \nHeat is transferred by means of currents called convectional currents.<\/p>\n

    Question 14.
    \nHow does heat transfer in liquids and gases?
    \nAnswer:
    \nIn liquids and gases heat is transmitted by mode of convection of heat.<\/p>\n

    Question 15.
    \nWhat is a medium?
    \nAnswer:
    \nThe material which helps in transfer of heat from one place to another is called a medium. Solid, liquid and gaseous substances act as medium for transfer of heat.<\/p>\n

    Question 16.
    \nHow does heat transfer if there is no medium?
    \nAnswer:
    \nHeat transfer, in the form of waves from one place to another. It does not require any medium.<\/p>\n

    Question 17.
    \nWrite one application of radiation of heat.
    \n(OR)
    \nHow does a thermal scanner work?
    \nAnswer:
    \nThe thermal scanner receives the heat in the form of radiation to measure our body temperature.<\/p>\n

    Question 18.
    \nWhat happens if we heat and cool a metal?
    \nAnswer:
    \nThe metal expands on heating and contracts on cooling.<\/p>\n

    \"AP<\/p>\n

    Question 19.
    \nWhich device is used to measure the temperature?
    \nAnswer:
    \nThermometers are used to measure temperature. .<\/p>\n

    Question 20.
    \nBased on which principle a Thermometer does work?
    \nAnswer:
    \nThermometer works on the expansion of liquids (mercury).<\/p>\n

    Question 21.
    \nWhere the thermometers are used?
    \nAnswer:
    \nPeople use thermometers in homes, hospitals, automobiles, industries and restaurants etc., to measure temperatures of different objects and substances.<\/p>\n

    Question 22.
    \nWhich is essential for our healthy living? (OR) Why should we protect environment?
    \nAnswer:
    \nA clean environment is essential for heaithy living. So, we want a concrete plan to protect environment.<\/p>\n

    Question 23.
    \nWhy does alcohol use in thermometer? (OR)How can a alcohol thermometer mea-sures very low temperatures?
    \nAnswer:
    \nThe freezing point of alcohol is less than -100\u00b0C. So, it can be used to measure very low temperatures.<\/p>\n

    Question 24.
    \nWrite the different types of thermometers?
    \nAnswer:
    \nThe different types of thermometers are Clinical Thermometer, Laboratory Thermometer, Digital Thermometer and Six\u2019s makimum and minimum thermometer.<\/p>\n

    Question 25.
    \nWhich instrument is used to measure the maximum (highest) and minimum (lowest) temperatures of a place in a day?
    \nAnswer:
    \nSix\u2019s maximum and minimum thermometer is one of the Meteorological Instruments used to measure maximum (highest) and minimum (lowest) temperatures of a place in a day.<\/p>\n

    Question 26.
    \nWhat is the normal temperature of the human body?
    \nAnswer:
    \nThe normal temperature,of the human body is 37\u00b0C or 98.4\u00b0F.<\/p>\n

    Question 27.
    \nWhy does smoke and hot air move up?
    \nAnswer:
    \nSmoke and hot air moves up because it expands and becomes lighter. . .<\/p>\n

    Question 28.
    \nWhat is the use of ventilators in our house?
    \nAnswer:
    \nSmoke and hot air moves up because it expands and becomes lighter through ventila\u00actors and exhaust fans on the upper parts of the wall.<\/p>\n

    Question 29.
    \nWhat happens to the air on heating?
    \nAnswer:
    \nOn heating, the air expands, occupying more space and becomes lighter.<\/p>\n

    \"AP<\/p>\n

    Question 30.
    \nWhat happens when air is compressed?
    \nAnswer:
    \nThe air pressure becomes more when air is compressed.<\/p>\n

    7th Class Science 9th Lesson Heat, Temperature and Climate Short Questions and Answers<\/h3>\n

    Question 1.
    \nWhen do we feel hot and cool?
    \nAnswer:<\/p>\n

      \n
    1. The heat when heat energy flows from hotter body to our body. We feel hot. Here we gain heat energy from the hotter body.<\/li>\n
    2. We feel cool, when heat energy flows from our body to colder body. Here, we lose heat energy.<\/li>\n<\/ol>\n

      Question 2.
      \nHow does heat flow? How do we determine its direction?
      \nAnswer:<\/p>\n

        \n
      1. Heat flows from a body of high temperature to a body of low temperature.<\/li>\n
      2. This direction is determined by temperature. ‘<\/li>\n<\/ol>\n

        Question 3.
        \nHow do we written degree of Celsius, degree of Fahrenheit and Kelvin?
        \nAnswer:<\/p>\n

          \n
        1. Degree Celsius: Celsius is written as \u00b0C and read as degree Celsius.<\/li>\n
        2. Degree Fahrenheit: Fahrenheit is written as \u00b0F and read as degree fahrenheit.<\/li>\n
        3. Kelvin is written as K and read as Kelvin.<\/li>\n<\/ol>\n

          Question 4.
          \nWhat is Air pressure? How does it measure? What are the effects of the air pres-sure?
          \nAnswer:
          \nAir pressure:
          \nThe force applied by air on any surface in contact is called \u201cair pressure\u201d.<\/p>\n

          Measuring of air pressure:
          \nAir pressure is measured in height of mercury level in centimeters, and it is measured with a barometer. Now a days aneroid barometers are used to measure air pressure.<\/p>\n

          Effects of air pressure:
          \nThe air pressure becomes more when it is compressed. When air expands and rises up it creates low pressure, which drives the air high pressure from surrounding to move and occupy that place.<\/p>\n

          \"AP<\/p>\n

          Question 5.
          \nWhy are cooking utensils made of metals while their handles are made of plastic or wood?
          \nAnswer:<\/p>\n

            \n
          1. Some materials allow heat through them, this property is called conductivity.<\/li>\n
          2. We use metals to make cooking vessels because they allow heat through them.<\/li>\n
          3. We use material which does not allow heat to pass through as handles.<\/li>\n
          4. So, cooking utensils made of metals while their handles are made of plastic or wood.<\/li>\n<\/ol>\n

            Question 6.
            \nWrite four applications of expansion of metals on heating.
            \nAnswer:<\/p>\n

              \n
            1. The electric power lines (wires) are held loose on poles<\/li>\n
            2. Rollers are kept under the beams of metal bridges<\/li>\n
            3. Mercury is used in thermometers<\/li>\n
            4. Small gaps are left between rails in railway tracks<\/li>\n<\/ol>\n

              Question 7.
              \nWrite the different modes of transfer of heat?
              \nAnswer:
              \nTransfer of heat is in different types of materials. Heat gets transferred in three different modes, They are<\/p>\n

                \n
              1. Conduction of heat<\/li>\n
              2. Convection of heat<\/li>\n
              3. Radiation of heat<\/li>\n<\/ol>\n

                1) Conduction of heat:
                \nThis process of transfer of heat from hotter to colder end through the conductor is called conduction. This mode of transfer of heat happens more in solid conductors.<\/p>\n

                2) Convection of heat:
                \nThis process of transfer of heat from source of heat to surface by the motion of particles is called \u201cconvection of heat\u201d. In liquids and gases heat is transmitted by mode of convection of heat.<\/p>\n

                3) Radiation of heat:
                \nThis process of transfer of heat in the form of waves is called radiation. Radiation does not need any material medium. Sun\u2019s heat transfers to earth in the form of radiation.<\/p>\n

                Question 8.
                \nWrite the differences between good conductors and poor conductors?
                \nAnswer:<\/p>\n\n\n\n\n\n\n\n
                Good conductors<\/td>\nPoor conductors<\/td>\n<\/tr>\n
                1) The materials which allow heat to pass through them are called conductors of heat.<\/td>\n1) The materials which do not allow heat to pass through them easily are poor conductors of heat.<\/td>\n<\/tr>\n
                2) Example: Aluminum, iron and copper etc.<\/td>\n2) Example : Water, air, clothes, glass, cork, plastic, wood etc.<\/td>\n<\/tr>\n
                3) Heat can pass.<\/td>\n3) Heat cannot pass.<\/td>\n<\/tr>\n
                4) These are used to prepare cooking cooking vessels.<\/td>\n4) These are used to prepare handles of vessels.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                Question 9.
                \nHow does a thermos flask work?
                \n(OR)
                \nDescribe working of a thermos flask.
                \nAnswer:<\/p>\n

                  \n
                1. Thermos flaSk has a two layered glass container and the air between these layers is removed to create vacuum.<\/li>\n
                2. The inner silver coating protects the contents (tea, coffee, milk) poured in the flask from losing heat through radiation.<\/li>\n
                3. As there is no medium between the walls of the flask. Neither conduction nor con-vection of heat takes place.<\/li>\n
                4. As a result, heat is not transferred outside the flask so it is retained inside the flask for a few hours.<\/li>\n<\/ol>\n

                  Question 10.
                  \nWhat is the reason for in the expansion of rails, mercury in thermometer, air inside the puri etc?
                  \nAnswer:<\/p>\n

                    \n
                  1. This is due to increase in the energy of particles present in these substances.<\/li>\n
                  2. Particles of substances occupy more space when they get heated.<\/li>\n
                  3. This is the reason for in the expansion of rails, mercury in thermometer, air inside the puri etc.<\/li>\n<\/ol>\n

                    Question 11.
                    \nHow does hot air balloon work?
                    \nAnswer:<\/p>\n

                      \n
                    1. Warm air is lighter than cold air.<\/li>\n
                    2. This property of air is used in flying of hot air balloons,<\/li>\n
                    3. It contains a bag which is called as envelope, and it is filled with heated air.<\/li>\n
                    4. There is a basket under the envelope which carries passengers and a source of heat.<\/li>\n<\/ol>\n

                      \"AP<\/p>\n

                      Question 12.
                      \nWhy mercury is used in thermometers?
                      \nAnswer:
                      \nMercury is used in thermometers, because it has the best properties to measure temperature.
                      \nThose are<\/p>\n

                        \n
                      1. It’s expansion is uniform.<\/li>\n
                      2. It is bpaque and shining.<\/li>\n
                      3. It does not stick to the sides of glass tube.<\/li>\n
                      4. It is a good conductor of heat.<\/li>\n
                      5. It has a high boiling point (357\u00b0C) and a low freezing point (-39\u00b0C). Hence a wide range of temperatures can be measured using a mercury.<\/li>\n<\/ol>\n

                        Question 13.
                        \nWhy alcohol is used in thermometers?
                        \nAnswer:
                        \nAlcohol is used in thermometers, because it has the best properties to measure temperature. Those are<\/p>\n

                          \n
                        1. The freezing point of alcohol is less than -100\u00b0C.<\/li>\n
                        2. So, it can be used to measure very low temperatures.<\/li>\n
                        3. It\u2019s expansion per degree Celsius rise in temperature is very large.<\/li>\n
                        4. It can be colored brightly and hence is easily visible.<\/li>\n<\/ol>\n

                          Question 14.
                          \nWhat are the melting point of ice and boiling point of water in different scales?
                          \nAnswer:
                          \n1) Celsius scale :
                          \nMelting point of ice is 0\u00b0C and boiling point of water is 100\u00b0C<\/p>\n

                          2) Fahrenheit scale :
                          \nMelting point of ice is 32\u00b0F and boiling point of water is 212\u00b0F<\/p>\n

                          3) Kelvin scale :
                          \nMelting point bf ice is 273K and boiling point of water is 373K<\/p>\n

                          Question 15.
                          \nWrite the Formulas for temperature conversion 1) Celsius to Fahrenheit 2) Celsius to Kelvin.
                          \nAnswer:
                          \n\"AP<\/p>\n

                          Question 16.
                          \nExplain two applications of transfer of heat.
                          \nAnswer:
                          \nThermal scanning:
                          \nThe thermal scanner receives the heat in the form of radiation to measure our body temperature.<\/p>\n

                          Thermos flask:
                          \nIt has a two layered glass container and the air between these layers is removed to create vacuum. The inner silver coating protects the contents (tea, coffee, milk) poured in the flask from losing heat through radiation. As there is no medium between the walls of the flask. Neither conduction nor convection of heat takes place. As a result, heat is not transferred outside the flask so it is retained inside the flask for a few hours.<\/p>\n

                          Question 17.
                          \nFill in the table with suitable answers.
                          \n\"AP
                          \nAnswer:
                          \n\"AP<\/p>\n

                          Question 18.
                          \nWhat is the use of a Clinical Thermometer? How it convenient to record the reading?
                          \nAnswer:<\/p>\n

                            \n
                          1. Clinical Thermometer is used in hospitals to measure the temperature of the human body.<\/li>\n
                          2. It has a kink that prevents the mercury from flowing back into the bulb when it was taken out of the patient\u2019s mouth.<\/li>\n
                          3. This helps to record the temperature conveniently.<\/li>\n<\/ol>\n

                            Question 19.
                            \nWhere a Laboratory Thermometer is used? How it is better than the clinical ther-mometer?
                            \n(OR)
                            \nDescribes laboratory Thermometer.
                            \nAnswer:<\/p>\n

                              \n
                            1. Laboratory Thermometer is used in school labs, industries etc. to measure temperature. It has no kink.<\/li>\n
                            2. It is made of a long stem and the bulb of mercury, so it can measure higher tempera-tures than clinical thermometer.<\/li>\n<\/ol>\n

                              Question 20.
                              \nHow does a Digital Thermometer work?
                              \nAnswer:<\/p>\n

                                \n
                              1. Digital Thermometer works without Mercury.<\/li>\n
                              2. It has a display which shows readings directly.<\/li>\n
                              3. It is very easy to use it, we can use it by just pressing on\/off button present on it.<\/li>\n
                              4. Even children can also handle this one.<\/li>\n<\/ol>\n

                                Question 21.
                                \nHow do you use a clinical thermometer and a laboratory thermometer?
                                \nAnswer:
                                \nClinical thermometer<\/p>\n

                                  \n
                                1. Wash the clinical thermometer properly with an antiseptic solution.<\/li>\n
                                2. To lower the mercury level, hold the thermometer firmly and give some jerks.<\/li>\n
                                3. Ensure that it falls below 35\u00b0C. Now place the bulb of the thermometer under your tongue.<\/li>\n
                                4. After one or two minutes, take the thermometer out and note the reading.<\/li>\n
                                5. This is your body temperature.<\/li>\n
                                6. Don\u2019t hold the thermometer by the bulb while reading it.<\/li>\n<\/ol>\n

                                  A Laboratory thermometer:<\/p>\n

                                    \n
                                  1. Take cold or hot water in a bowl. Place the mercury bulb of the thermometer in the water so that the bulb immerses in it.<\/li>\n
                                  2. Wait for some time till the mercury level shows a constant reading.<\/li>\n
                                  3. Note down that reading.<\/li>\n<\/ol>\n

                                    \"AP<\/p>\n

                                    Question 22.
                                    \nHow does sunstroke occur?
                                    \n(OR)
                                    \nWhat happens when humidity increases in the air?
                                    \nAnswer:<\/p>\n

                                      \n
                                    1. Evaporation of sweat from our body makes us cool to maintain our body temperature.<\/li>\n
                                    2. In summer, the humidity of air is high. Due to high humidity and temperature, it becomes difficult to evaporate the sweat from our body to cool It down.<\/li>\n
                                    3. But still our body losses water.<\/li>\n
                                    4. High temperatures, along with humidity sometimes may cause heat stroke or sun\u00acstroke.<\/li>\n<\/ol>\n

                                      Question 23.
                                      \nWhat is the first aid for sunstroke?
                                      \nAnswer:
                                      \nFirst Aid for sunstroke :<\/p>\n

                                        \n
                                      1. Call 108 immediately. Move the victim to a cool ventilated place.<\/li>\n
                                      2. Then loosen his dress and remove extra clothing. Put a cold wet towel on his head, back of the neck, on the grain and under the armpits.<\/li>\n
                                      3. Fan air over the patient while wetting their skin with water from a sponge or wet cloth. Give plenty of cool, lightly salted water to drink often but in small sips.<\/li>\n
                                      4. Help the person stay calm without any anxiety.<\/li>\n<\/ol>\n

                                        Question 24.
                                        \nWhat is weather of a place? What are its measuring components?
                                        \nAnswer:<\/p>\n

                                          \n
                                        1. The day-to-day variations in the components like temperature, humidity, rainfall, wind speed are called weather.<\/li>\n
                                        2. Maximum and minimum temperature of a day, air pressure, rainfall, wind speed and humidity are called measuring components of weather.<\/li>\n<\/ol>\n

                                          Question 25.
                                          \nHow do Meteorologists decide the climate of the place?
                                          \nAnswer:<\/p>\n

                                            \n
                                          1. Meteorologists (scientists who study and work on weather) record weather every day. .<\/li>\n
                                          2. These records of the weather have been preserved for the past several decades.<\/li>\n
                                          3. They help us to determine the weather pattern of a place.<\/li>\n
                                          4. The average weather pattern taken over a long period, say 25 years or more, is called the climate of the place.<\/li>\n<\/ol>\n

                                            Question 26.
                                            \nWhy does climate affect pur life style? What are its measuring components?
                                            \nAnswer:<\/p>\n

                                              \n
                                            1. Climate of a place remains unchanged for a long period of time. So, it affects our lifestyle.<\/li>\n
                                            2. The measuring components of climate are maximum and minimum temperature of a day, air pressure, rainfall, wind speed and humidity.<\/li>\n<\/ol>\n

                                              Question 27.
                                              \nWhat are the differences between weather and climate?
                                              \nAnswer:<\/p>\n\n\n\n\n\n\n\n
                                              Weather<\/td>\nClimate<\/td>\n<\/tr>\n
                                              Weather keeps on changing rapidly.<\/td>\nClimate of a place remains unchanged for a long period of time.<\/td>\n<\/tr>\n
                                              It affects our daily life.<\/td>\nIt affects our life style<\/td>\n<\/tr>\n
                                              Atmospheric conditions in a speciiic area and time.<\/td>\nAtmospheric conditions of a place for a long period of time.<\/td>\n<\/tr>\n
                                              It is not constant.<\/td>\nIt remains constant for 25 years or more.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                                              Question 28.
                                              \nHow weather and climate is effected our life?
                                              \nAnswer:<\/p>\n

                                                \n
                                              1. Daily weather and long-term climatic conditions influence the life style of humans and other living things directly and indirectly.<\/li>\n
                                              2. Some of them are diet, clothing, housing, occupations etc.<\/li>\n<\/ol>\n

                                                Question 29.
                                                \nDoctor put the thermometer in the mouth of Karthikeya\u2019s sister, Neha. By seeing this Karthikeya got some doubts and asked doctor. What could be those doubts?
                                                \nAnswer:<\/p>\n

                                                  \n
                                                1. What is in the thermometer?<\/li>\n
                                                2. How does it show the temperature?<\/li>\n
                                                3. How can you say Neha got the fever?<\/li>\n
                                                4. How much time shall it place in the mouth?<\/li>\n<\/ol>\n

                                                  Question 30.
                                                  \nGuess what will happen if we use the clinical thermometer to measure the temperature of the ice cubes or boiling water?
                                                  \nAnswer:
                                                  \nWe cannot measure too low and too high temperatures by using a clinical thermometer. It is made for clinical use only, so by using this we can measure from 35\u00b0C to 42\u00b0C only. If we measure temperature of boiling water or ice cubes it will break or it does not work.<\/p>\n

                                                  Question 31.
                                                  \nGuess what will happen if a low air pressure is formed in your area?
                                                  \nAnswer:
                                                  \nIf a low air pressure is formed in our area, air blow from high air pressure area to occupy the low air pressure area. Sometimes this wind causes damage to roofs, trees etc.<\/p>\n

                                                  \"AP<\/p>\n

                                                  Question 32.
                                                  \nKalyan said that the climate was changed by being seen the dark clouds in the sky. Is the word climate correct in his statement?
                                                  \nAnswer:
                                                  \nNo. climate is different from weather. The changes occur during the period of some hours is called changing in weather. Climate is average weather conditions of a long period. So he had to use weather instead of climate in his statement.<\/p>\n

                                                  Question 33.
                                                  \nWhat will happen, if there is no kink in the clinical thermometer?
                                                  \nAnswer:
                                                  \nThe kink prevents the mercury from flowing back into the bulb when it was taken out of the patient\u2019s mouth. This helps to record the temperature conveniently. If there is no kink the level of the mercury will fall down in the gap of taking out from the patient and seeing the reading. So, it may show incorrect reading.<\/p>\n

                                                  Question 34.
                                                  \nWhat is your observation in the activity of metal spoon with fixed pins and a candle and write the reason.
                                                  \nAnswer:
                                                  \nI will observe the dropping of pins one after another from the flame end of the spoon. This is due to the transfer of heat from the end kept in the flame (hotter end) towards your hand (colder end) through a spoon (metal).<\/p>\n

                                                  Question 35.
                                                  \nWhat are your observations in the activity of expansion of metal on heating?
                                                  \nAnswer:
                                                  \nI will observe movement in the straw. The needle rolls on the second block of wood because of the expansion of the cycle spoke. If we remove the candles the needle rolls back causing movement in the straw opposite to the previous motion.<\/p>\n

                                                  Question 36.
                                                  \nRead the graph and answer the following questions.
                                                  \n\"AP
                                                  \n1. Which component was shown in the graph?
                                                  \nAnswer:
                                                  \nTemperature<\/p>\n

                                                  2. On which day the maximum temperatures recorded?
                                                  \nAnswer:
                                                  \nOn the dates, 1-12-2020 and 2-12-2020 the maximum temperature was recorded.<\/p>\n

                                                  Question 37.
                                                  \nTake a glass and keep a postcard oh it. Wave your notebook above the post card to displace the air just above the postcard. What is your observation? What is the reason for it?
                                                  \nAnswer:
                                                  \nThe moving air creates low pressure. Hence the postcard lifts up due to the higher pressure on the card from air inside the glass.<\/p>\n

                                                  Question 38.
                                                  \nObserve the figure and give answers to the following questions.
                                                  \n1. What mode of transfer of heat is observed in the spoon?
                                                  \n2. What is the source of heat?
                                                  \n3. What will happen after some time?
                                                  \n4. What is the medium here?
                                                  \n\"AP
                                                  \nAnswer:
                                                  \n1. Conduction of heat is observed in the spoon
                                                  \n2. Candle is the source of heat.
                                                  \n3. All the pins will fall down.
                                                  \n4. Metal in the spoon is the medium (solid)<\/p>\n

                                                  Question 39.
                                                  \nFill in the table with suitable answers.<\/p>\n\n\n\n\n\n\n\n
                                                  Component in the weather<\/td>\nUnits<\/td>\nDevice to measure<\/td>\n<\/tr>\n
                                                  Temperature<\/td>\nKelvin or \u00b0C or \u00b0F<\/td>\n<\/td>\n<\/tr>\n
                                                  Air pressure<\/td>\nMercury level in centimeters<\/td>\n<\/td>\n<\/tr>\n
                                                  <\/td>\nMillimeters<\/td>\nRain gauge<\/td>\n<\/tr>\n
                                                  Humidity<\/td>\nGrams per cubic meter.<\/td>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                                                  Answer:<\/p>\n\n\n\n\n\n\n\n
                                                  Component in the weather<\/td>\nUnits<\/td>\nDevice to measure<\/td>\n<\/tr>\n
                                                  Temperature<\/td>\nKelvin or C or \u00b0F<\/td>\nThermometer<\/td>\n<\/tr>\n
                                                  Air pressure<\/td>\nMercury level in centimeters<\/td>\nBarometer<\/td>\n<\/tr>\n
                                                  Rain fall<\/td>\nMillimeters<\/td>\nRain gauge.<\/td>\n<\/tr>\n
                                                  Humidity<\/td>\nGrams per cubic meter.<\/td>\nHygrometer<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                                                  Question 40.
                                                  \nFill in the table with suitable answers.<\/p>\n\n\n\n\n\n\n\n\n
                                                  Phenomenon<\/td>\nExamples<\/td>\n<\/tr>\n
                                                  Convection<\/td>\n1) Milk 2)…………………. 3) …………………….<\/td>\n<\/tr>\n
                                                  Conduction<\/td>\n1) Metal spoon 2)………. 3) \u2026\u2026\u2026\u2026\u2026\u2026<\/td>\n<\/tr>\n
                                                  Radiation<\/td>\n1) Sun to earth 2)………. 3) \u2026\u2026\u2026\u2026\u2026\u2026.<\/td>\n<\/tr>\n
                                                  Insulators<\/td>\n1) Rubber 2)…………….. 3) \u2026\u2026\u2026\u2026\u2026\u2026<\/td>\n<\/tr>\n
                                                  Conductors<\/td>\n1) Iron spoke 2)…………. 3) \u2026\u2026\u2026\u2026\u2026\u2026<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                                                  Answer:<\/p>\n\n\n\n\n\n\n\n\n
                                                  Phenomenon<\/td>\nExamples<\/td>\n<\/tr>\n
                                                  Convection<\/td>\n1) Milk 2) Eater 3)oil<\/td>\n<\/tr>\n
                                                  Conduction<\/td>\n1) Metal spoon 2)copper vessel 3)nail<\/td>\n<\/tr>\n
                                                  Radiation<\/td>\n1) Sun to earth 2) flask inner to outer 3) sun to moon<\/td>\n<\/tr>\n
                                                  Insulators<\/td>\n1) Rubber 2) glass 3) water<\/td>\n<\/tr>\n
                                                  Conductors<\/td>\n1) Iron spoke 2) vessels 3) copper wire<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                                                  Question 41.
                                                  \nDraw the diagram of mercury laboratory thermometer.
                                                  \nAnswer:
                                                  \n\"AP<\/p>\n

                                                  Question 42.
                                                  \nDraw the diagram of alcohol laboratory thermometer.
                                                  \nAnswer:
                                                  \n\"AP<\/p>\n

                                                  Question 43.
                                                  \nDraw the diagram of a thermos flask and label its inner parts.
                                                  \nAnswer:
                                                  \n\"AP<\/p>\n

                                                  44. Draw the diagram showing the arrangement of apparatus to show the expansion of liquids on heating?
                                                  \nAnswer:
                                                  \n\"AP<\/p>\n

                                                  45. Draw the diagram of Six minimum and maximum temperatures and label the parts.
                                                  \nAnswer:
                                                  \n\"AP<\/p>\n

                                                  7th Class Science 9th Lesson Heat, Temperature and Climate Long Questions and Answers<\/h3>\n

                                                  Question 1.
                                                  \nCompare different modes of transfer of heat.
                                                  \nAnswer:<\/p>\n\n\n\n\n\n\n\n\n
                                                  Conduction<\/td>\nConvection<\/td>\nRadiation<\/td>\n<\/tr>\n
                                                  1) The process of transfer of heat from hotter to colder end through the conductor is called conduction of heat.<\/td>\nThe process of transfer of heat from source of heat to surface by the motion of particles is called convection of heat.<\/td>\nThe process of transfer of heat in the form of waves is called radiation.<\/td>\n<\/tr>\n
                                                  2) In solids heat is transmitted by mode of conduction of heat.<\/td>\nIn liquids and gases heat is transmitted by mode of convection of heat.<\/td>\nRadiation does not need any material medium<\/td>\n<\/tr>\n
                                                  3) Ex: metals<\/td>\nEx: water, milk<\/td>\nEx : Sun\u2019s heat to earth<\/td>\n<\/tr>\n
                                                  4) No movement in the particles.<\/td>\nMovement in the particles.<\/td>\nNo movement in the particles<\/td>\n<\/tr>\n
                                                  5) It needs thermal contact.<\/td>\nIt does not need thermal contact.<\/td>\nIt does not need thermal contact.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                                                  Question 2.
                                                  \nWrite about different types of thermometers.
                                                  \nAnswer:
                                                  \nClinical thermometer:<\/p>\n

                                                    \n
                                                  1. Wash the clinical thermometer properly with an antiseptic solution.<\/li>\n
                                                  2. To lower the mercury level, hold the thermometer firmly and give some jerks.<\/li>\n
                                                  3. Ensure that it falls below 35\u00b0C. Now place the bulb of the thermometer under your tongue.<\/li>\n
                                                  4. After one or two minutes, take the thermometer out and note the reading.<\/li>\n
                                                  5. This is your body temperature.<\/li>\n
                                                  6. Don\u2019t hold the thermometer by the bulb while reading it.<\/li>\n<\/ol>\n

                                                    Laboratory thermometer:<\/p>\n

                                                      \n
                                                    1. Take cold or hot water in a bowl. Place the mercury bulb of the thermometer in the water so that the bulb immerses in it.<\/li>\n
                                                    2. Wait for some time till the mercury level shows a constant reading.<\/li>\n
                                                    3. Note down that reading.<\/li>\n<\/ol>\n

                                                      Digital Thermometer:<\/p>\n

                                                        \n
                                                      1. It works without mercury.<\/li>\n
                                                      2. It has a display which shows readings directly.<\/li>\n
                                                      3. It is very easy to use it.<\/li>\n
                                                      4. We can use it by just pressing on\/off button present on it.<\/li>\n
                                                      5. Even children can also handle this one.<\/li>\n<\/ol>\n

                                                        Six\u2019s maximum and minimum thermometer:<\/p>\n

                                                          \n
                                                        1. It is one of the Meteorological Instruments used to measure maximum (highest) and minimum (lowest) temperatures of a place in a day.<\/li>\n
                                                        2. It has a cylindrical \u2018Bulb A\u2019, and \u2018Bulb B\u2019 connected through a \u2018U-shaped tube\u2019 con\u00actaining mercury.<\/li>\n
                                                        3. Bulb A contains alcohol, and bulb B contains alcohol and its vapours.<\/li>\n
                                                        4. When the temperature increases, the alcohol in the bulb A expands and pushes the mercury in the U tube, this makes indicator(M) to move up.<\/li>\n
                                                        5. This indicates the maximum temperature of the day.<\/li>\n
                                                        6. When the temperature decreases, alcohol in the bulb A contracts and pulls the mercury back.<\/li>\n
                                                        7. This makes indicator (N) to move up.<\/li>\n
                                                        8. This indicates the minimum temperature of the day.<\/li>\n
                                                        9. After taking readings the indicators M and N are brought to their original places by using a magnet.<\/li>\n<\/ol>\n

                                                          \"AP<\/p>\n

                                                          Question 3.
                                                          \nWhat is humidity? How does it measure? How does it affect or body? What is the first aid of sunstroke?
                                                          \nAnswer:
                                                          \nHumidityAll the evaporated water from different water bodies go into air. This water vapour present in the air is called humidity.<\/p>\n

                                                          Measurement of humidity:
                                                          \nHygrometer is used to measure humidity in air and it is expressed in grams per cubic meter.<\/p>\n

                                                          Effects of humidity:
                                                          \nEvaporation of sweat from our body makes us cool to maintain our body temperature. In summer, the humidity of air is high. Due to high humidity and temperature, it becomes difficult to evaporate the sweat from our body to cool it down. But, still our body losses water. High temperatures, along with humidity sometimes may cause heat stroke or sunstroke.<\/p>\n

                                                          First Aid for sunstroke:
                                                          \nCall 108 immediately. Move the person out of the heat. Fan while spraying water to cool him. Let the person drink water to rehydrate.<\/p>\n

                                                          Question 4.
                                                          \nRead the following table and answer the questions.
                                                          \n\"AP
                                                          \ni) At what temperature, the ice melts? Express in Celsius.
                                                          \nii) Which measurements are given in the table?
                                                          \niii) Convert, 100\u00b0C into Fahrenheit and kelvin scale.
                                                          \niv) What are the SI units of temperature?
                                                          \nAnswer:
                                                          \ni) 0\u00b0C .
                                                          \nii) Measurements of temperature are given.
                                                          \niii) 100\u00b0C =212\u00b0F =373K
                                                          \niv) Kelvin<\/p>\n

                                                          Question 5.
                                                          \nHow do you appreciate the weather reports?
                                                          \nAnswer:<\/p>\n

                                                            \n
                                                          1. The day-to-day variations in the components like temperature, humidity, rainfall, , wind speed are called weather.<\/li>\n
                                                          2. It keeps on changing and changes are very fast too.<\/li>\n
                                                          3. One day it may be dry and sunny and the next day it may rain.<\/li>\n
                                                          4. It gives the information about atmospheric conditions in a specific area and time.<\/li>\n
                                                          5. We can get details of weather from weather reports and you can see these symbols on television, newspapers and in weather forecasting.<\/li>\n
                                                          6. Weather forecasting is the application of science and technology to predict the conditions of the atmosphere using components of weather for a given location and time.<\/li>\n
                                                          7. Weather reports are very useful to farmers, fishermen etc.<\/li>\n
                                                          8. So I appreciate the weather reports.<\/li>\n<\/ol>\n

                                                            Question 6.
                                                            \nHow do you appreciate the properties of the mercury and alcohol as they are used in the thermometers?
                                                            \nAnswer:
                                                            \nProperties of mercury:<\/p>\n

                                                              \n
                                                            1. Its expansion is uniform.<\/li>\n
                                                            2. It is opaque and shining.<\/li>\n
                                                            3. It does not stick to the sides of glass tube.<\/li>\n
                                                            4. It is a good conductor of heat.<\/li>\n
                                                            5. It has a high boiling point (357\u00b0C) and a low freezing point (-39\u00b0C).<\/li>\n<\/ol>\n

                                                              Hence a wide range of temperatures can be measured using mercury.<\/p>\n

                                                              Properties of alcohol:<\/p>\n

                                                                \n
                                                              1. The freezing point of alcohol is less than -100\u00b0C. So, it can be used to measure very low temperatures.<\/li>\n
                                                              2. It\u2019s expansion per degree Celsius rise in temperature is very large.<\/li>\n
                                                              3. It can be coloured brightly and hence is easily visible.<\/li>\n<\/ol>\n

                                                                Hence a wide range of temperatures can be measured using alcohol. Clinical ther-mometers, laboratory thermometers, six minimum and maximum thermometers etc. are made with alcohol or mercury or both.<\/p>\n

                                                                Hence I appreciate the properties of the mercury and alcohol as they are used in the thermometers<\/p>\n

                                                                AP Board 7th Class Science 9th Lesson 1 Mark Bits Questions and Answers Heat, Temperature and Climate<\/h3>\n

                                                                I. Multiple Choice Questions<\/span><\/p>\n

                                                                Choose the correct answer and write its letters in the brackets.<\/p>\n

                                                                1. It is a form of energy that flows from a hotter body to a cooler body.
                                                                \nA) Heat
                                                                \nB) Light
                                                                \nC) Sound
                                                                \nD) Electricity
                                                                \nAnswer:
                                                                \nA) Heat<\/p>\n

                                                                2. When heat energy flows from our body to Lassi. Here,
                                                                \nA) Lassi loss Heat energy
                                                                \nB) Body lose heat energy
                                                                \nC) Body gain heat energy
                                                                \nD) A and C
                                                                \nAnswer:
                                                                \nB) Body lose heat energy<\/p>\n

                                                                3. Joules are units of
                                                                \nA) Humidity
                                                                \nB) Climate
                                                                \nC) Heat
                                                                \nD) Air pressure
                                                                \nAnswer:
                                                                \nC) Heat<\/p>\n

                                                                \"AP<\/p>\n

                                                                4. The degree of hotness or coldness is called ………..
                                                                \nA) Humidity
                                                                \nB) Temperature
                                                                \nC) Heat
                                                                \nD) Air pressure
                                                                \nAnswer:
                                                                \nD) Air pressure<\/p>\n

                                                                5. Temperature is measured in…….
                                                                \nA) Degrees of Celsius
                                                                \nB) Degrees of Fahrenheit
                                                                \nC) Kelvin
                                                                \nD) All
                                                                \nAnswer:
                                                                \nD) All<\/p>\n

                                                                6. The SI unit of temperature is ………….
                                                                \nA) Degrees of Celsius
                                                                \nB) Degrees of Fahrenheit
                                                                \nC) Kelvin
                                                                \nD) All
                                                                \nAnswer:
                                                                \nC) Kelvin<\/p>\n

                                                                7. Kelvin is written as
                                                                \nA) \u00b0C
                                                                \nB) \u00b0F
                                                                \nC) \u00b0K
                                                                \nD) K
                                                                \nAnswer:
                                                                \nD) K<\/p>\n

                                                                8. Which is correct?
                                                                \ni) Heat is the degrees of hotness or coldness.
                                                                \nii) Heat is measured in joules
                                                                \nA) i only
                                                                \nB) ii only
                                                                \nC) both i & ii
                                                                \nD) both are incorrect
                                                                \nAnswer:
                                                                \nB) ii only<\/p>\n

                                                                9. Cooking utensils are made of ………..
                                                                \nA) conductors
                                                                \nB) insulators
                                                                \nC) fuels
                                                                \nD) none of the above
                                                                \nAnswer:
                                                                \nA) conductors<\/p>\n

                                                                10. Handles of cooking vessels are made of …………….
                                                                \nA) conductors
                                                                \nB) insulators
                                                                \nC) fuels
                                                                \nD) none of the above
                                                                \nAnswer:
                                                                \nB) insulators<\/p>\n

                                                                11. A: Metals are used to make cooking vessels.
                                                                \nR: Metals allow heat through them.
                                                                \nWhich is correct?
                                                                \nA) A & R are correct and R supports A
                                                                \nB) A & R are correct but R does not support A
                                                                \nC) A is correct but R is wrong
                                                                \nD) R is Correct but A is wrong
                                                                \nAnswer:
                                                                \nA) A & R are correct and R supports A<\/p>\n

                                                                12. The ability of a material to conduct heat is called …………..
                                                                \nA) Thermal conductivity
                                                                \nB) Thermal resistivity
                                                                \nC) Thermometer
                                                                \nD) None
                                                                \nAnswer:
                                                                \nA) Thermal conductivity<\/p>\n

                                                                13. It is not a good conductor.
                                                                \nA) Copper
                                                                \nB) Steel
                                                                \nC) Plastic
                                                                \nD) Cast iron
                                                                \nAnswer:
                                                                \nC) Plastic<\/p>\n

                                                                \"AP<\/p>\n

                                                                14. Insulator is….
                                                                \nA) Water
                                                                \nB) Glass
                                                                \nC) Plastic
                                                                \nD) All
                                                                \nAnswer:
                                                                \nD) All<\/p>\n

                                                                15. Heat cannot pass in the mode of
                                                                \nA) Conduction
                                                                \nB) Convection of heat
                                                                \nC) Radiation of heat
                                                                \nD) None
                                                                \nAnswer:
                                                                \nD) None<\/p>\n

                                                                16. In which heat is transferred from one end to another end by the mode of conduction.
                                                                \nA) Steel spoon
                                                                \nB) Water
                                                                \nC) A and B
                                                                \nD) Sun to earth
                                                                \nAnswer:
                                                                \nA) Steel spoon<\/p>\n

                                                                17. This mode of transfer of heat happens more in solid conductors
                                                                \nA) Conduction
                                                                \nB) Convection of heat
                                                                \nC) Radiation of heat
                                                                \nD) None
                                                                \nAnswer:
                                                                \nA) Conduction<\/p>\n

                                                                18. This process of transfer of heat from source of heat to surface by the motion of particles
                                                                \nA) Conduction
                                                                \nB) Convection of heat
                                                                \nC) Radiation of heat
                                                                \nD) all
                                                                \nAnswer:
                                                                \nB) Convection of heat<\/p>\n

                                                                19. This is not a medium of heat energy.
                                                                \nA) Solid
                                                                \nB) Liquid
                                                                \nC) Gas
                                                                \nD) None
                                                                \nAnswer:
                                                                \nD) None<\/p>\n

                                                                20. This mode of transfer of heat doesn\u2019t require any media.
                                                                \nA) Conduction
                                                                \nB) Convection of heat
                                                                \nC) Radiation of heat
                                                                \nD) All
                                                                \nAnswer:
                                                                \nC) Radiation of heat<\/p>\n

                                                                21. The process of transfer of heat in the form of waves is called
                                                                \nA) Conduction
                                                                \nB) Convection of heat
                                                                \nC) Radiation of heat
                                                                \nD) All
                                                                \nAnswer:
                                                                \nC) Radiation of heat<\/p>\n

                                                                22. Which instrument can control the transfer of heat (loss of heat)?
                                                                \nA) Thermos flask
                                                                \nB) Thermometer
                                                                \nC) Thermal scanner
                                                                \nD) All
                                                                \nAnswer:
                                                                \nA) Thermos flask<\/p>\n

                                                                \"AP<\/p>\n

                                                                23. The flask retains hot inside the flask for
                                                                \nA) a few hours
                                                                \nB) ever
                                                                \nC) never
                                                                \nD) a few weeks.
                                                                \nAnswer:
                                                                \nA) a few hours<\/p>\n

                                                                24. Thermos flask was invented by
                                                                \nA) Sir James cook
                                                                \nB) Sir James Chadwick
                                                                \nC) Sir James Dewar
                                                                \nD) Sir James watts
                                                                \nAnswer:
                                                                \nC) Sir James Dewar<\/p>\n

                                                                25. Which of the following expands on heating and contracts on cooling?
                                                                \nA) Solid
                                                                \nB) Liquid
                                                                \nC) Gas
                                                                \nD) All
                                                                \nAnswer:
                                                                \nD) All<\/p>\n

                                                                26. Air on cooling
                                                                \nA) contracts
                                                                \nB) occupy less space.
                                                                \nC) expand
                                                                \nD) A and B
                                                                \nAnswer:
                                                                \nD) A and B<\/p>\n

                                                                27. Warm air is lighten than cold air. This property of air is used in
                                                                \nA) hot air balloons
                                                                \nB) kites
                                                                \nC) rockets
                                                                \nD) all
                                                                \nAnswer:
                                                                \nA) hot air balloons<\/p>\n

                                                                28. Thermometer contains bulb of
                                                                \nA) mercury
                                                                \nB) alcohol
                                                                \nC) A or B
                                                                \nD) silver
                                                                \nAnswer:
                                                                \nC) A or B<\/p>\n

                                                                29. Mercury is a in room temperature.
                                                                \nA) solid
                                                                \nB) liquid
                                                                \nC) gas
                                                                \nD) all
                                                                \nAnswer:
                                                                \nA) solid<\/p>\n

                                                                30. This is not a property of the mercury .
                                                                \nA) Its expansion is uniform.
                                                                \nB) It is a good conductor of heat.
                                                                \nC) It easily sticks to the sides of glass tube.
                                                                \nD) It has a high boiling point.
                                                                \nAnswer:
                                                                \nC) It easily sticks to the sides of glass tube.<\/p>\n

                                                                \"AP<\/p>\n

                                                                31. The boiling point and a freezing point of the mercury are
                                                                \nA) -39\u00b0C and 357\u00b0C
                                                                \nB) 357\u00b0C and-39\u00b0C
                                                                \nC)100\u00b0C and 0\u00b0C
                                                                \nD) none
                                                                \nAnswer:
                                                                \nB) 357\u00b0C and-39\u00b0C<\/p>\n

                                                                32. A: The freezing point of alcohol is more than -100\u00b0C.
                                                                \nR: Alcohol can be used to measure very low temperatures.
                                                                \nA) A & R are correct and R supports A
                                                                \nB) A & R are correct but R does not support A
                                                                \nC) A is correct but R is wrong
                                                                \nD) R is correct but A is wrong
                                                                \nAnswer:
                                                                \nD) R is correct but A is wrong<\/p>\n

                                                                33. Number of divisions in Fahrenheit scale is
                                                                \nA) 100
                                                                \nB) 212
                                                                \nC) 180
                                                                \nD) 32
                                                                \nAnswer:
                                                                \nC) 180<\/p>\n

                                                                34. Number of divisions in Kelvin scale is
                                                                \nA) 100
                                                                \nB) 212
                                                                \nC) 180
                                                                \nD) 32
                                                                \nAnswer:
                                                                \nA) 100<\/p>\n

                                                                35. Number of divisions in Celsius scale is
                                                                \nA) 100
                                                                \nB) 212
                                                                \nC) 180
                                                                \nD) 32
                                                                \nAnswer:
                                                                \nA) 100<\/p>\n

                                                                36. Which prevents the mercury from flowing back into the bulb in clinical thermometer.
                                                                \nA) Capillary
                                                                \nB) Kink
                                                                \nC) Bulb
                                                                \nD) Magnet
                                                                \nAnswer:
                                                                \nB) Kink<\/p>\n

                                                                37. Laboratory thermometer can measure higher temperatures than clinical thermometer because, it has
                                                                \nA) long bulb
                                                                \nB) long stem
                                                                \nC) short bulb
                                                                \nD) short stem
                                                                \nAnswer:
                                                                \nB) long stem<\/p>\n

                                                                38. This thermometer can work without Mercury.
                                                                \nA) Six max and min thermometer
                                                                \nB) Digital Thermometer
                                                                \nC) Clinical thermometer
                                                                \nD)All
                                                                \nAnswer:
                                                                \nB) Digital Thermometer<\/p>\n

                                                                39. Who invented Six’s maximum and minimum thermometer in 1780?
                                                                \nA) Sir James cook
                                                                \nB) James watt
                                                                \nC) Sir James Dewar
                                                                \nD) James Six
                                                                \nAnswer:
                                                                \nD) James Six<\/p>\n

                                                                \"AP<\/p>\n

                                                                40. The correct order is
                                                                \ni) After one or two minutes, take the thermometer out and note the reading,
                                                                \nii) Place the bulb of the thermometer under your friend\u2019s tongue.
                                                                \niii) Wash the clinical thermometer properly with an antiseptic solution.
                                                                \niv) To lower the mercury level, hold the thermometer firmly and give some jerks.
                                                                \nA) iv, ii, i, iii
                                                                \nB) iv, iii, ii, i
                                                                \nC) iii, iv, ii, i
                                                                \nD) ii, iii, iv, i
                                                                \nAnswer:
                                                                \nC) iii, iv, ii, i<\/p>\n

                                                                41. The normal temperature of the human body is
                                                                \nA) 37\u00b0C
                                                                \nB) 98.4\u00b0F
                                                                \nC) 310K
                                                                \nD) all
                                                                \nAnswer:
                                                                \nD) all<\/p>\n

                                                                42. Ventilators are working on
                                                                \nA) Air expands on heating
                                                                \nB) Air contracts on heating
                                                                \nC) Metal expands on heating
                                                                \nD) Air contracts on cooling
                                                                \nAnswer:
                                                                \nA) Air expands on heating<\/p>\n

                                                                43. Which is used to measure the air pressure?
                                                                \nA) Hygrometer
                                                                \nB) Thermometer
                                                                \nC) Barometer
                                                                \nD) Rain gauge
                                                                \nAnswer:
                                                                \nC) Barometer<\/p>\n

                                                                44. A: If roofs were weak, they could be lifted and blown away.
                                                                \nR: The moving air creates high pressure.
                                                                \nA) A & R are correct and R supports A
                                                                \nB) A & R are correct but R does not support A
                                                                \nC) A is correct but R is wrong
                                                                \nD) R is correct but A is wrong
                                                                \nAnswer:
                                                                \nC) A is correct but R is wrong<\/p>\n

                                                                45. Rain fall is measured with a
                                                                \nA) hygrometer
                                                                \nB) thermometer
                                                                \nC) barometer
                                                                \nD) rain gauge
                                                                \nAnswer:
                                                                \nD) rain gauge<\/p>\n

                                                                46. This is not a measuring component of weather
                                                                \nA) humidity
                                                                \nB) temperature
                                                                \nC) wind speed
                                                                \nD) none
                                                                \nAnswer:
                                                                \nD) none<\/p>\n

                                                                47. Humidity is measured in
                                                                \nA) g\/cubic meter
                                                                \nB) mm\/cubic meter
                                                                \nC) \u00b0C
                                                                \nD) m\/\u00b0C
                                                                \nAnswer:
                                                                \nA) g\/cubic meter<\/p>\n

                                                                48. In summer, the humidity of air is
                                                                \nA) low
                                                                \nB) high
                                                                \nC) no change
                                                                \nD) zero
                                                                \nAnswer:
                                                                \nB) high<\/p>\n

                                                                49. High temperatures, along with humidity sometimes may cause
                                                                \nA) kwashiorkor
                                                                \nB) beriberi
                                                                \nC) corona
                                                                \nD) sunstroke
                                                                \nAnswer:
                                                                \nD) sunstroke<\/p>\n

                                                                50. It gives the information about atmospheric conditions in a specific area and time.
                                                                \nA) Weather
                                                                \nB) Climate
                                                                \nC) A and B
                                                                \nD) None
                                                                \nAnswer:
                                                                \nA) Weather<\/p>\n

                                                                51. This deals with a long period.
                                                                \nA) Weather
                                                                \nB) Climate
                                                                \nC) A and B
                                                                \nD) None
                                                                \nAnswer:
                                                                \nB) Climate<\/p>\n

                                                                52. It affects our lifestyle
                                                                \nA) Weather
                                                                \nB) Climate
                                                                \nC) A and B
                                                                \nD) None
                                                                \nAnswer:
                                                                \nB) Climate<\/p>\n

                                                                \"AP<\/p>\n

                                                                53. Which phenomenon measures atmospheric conditions in a specific area and time?
                                                                \nA) Weather
                                                                \nB) Climate
                                                                \nC) A and B
                                                                \nD) None
                                                                \nAnswer:
                                                                \nA) Weather<\/p>\n

                                                                II. Fill in the blanks<\/span><\/p>\n

                                                                1. Heat is a form of energy that flows from a ………………. body to a ………………. body.
                                                                \n2. Heat is measured in ………………. with calorimeter
                                                                \n3. Heat flows from a body of high temperature to a body of low temperature. This direction is determined by ………………. .
                                                                \n4. The degree of ………………. is called ‘temperature’.
                                                                \n5. Degree of Celsius is written as ………………. .
                                                                \n6. Degree of Fahrenheit is written as ………………. .
                                                                \n7. Some materials allow heat through them, this property is called ………………. .
                                                                \n8. Water, air, clothes, glass, cork, plastic, wood etc. are some examples of ………………. .
                                                                \n9. This process of transfer of heat from hotter to colder end through the conductor’ is called ………………. .
                                                                \n10. The contact which transfers heat by any mode is called ………………. .
                                                                \n11. Water is a ………………. of heat.
                                                                \n12. Heat is transferred by means of ………………. called convectional currents.
                                                                \n13. The materials which help in transfer of heat from one place to another are called ………………. .
                                                                \n14. Sun\u2019s heat transfers to earth in the form of ………………. .
                                                                \n15. The thermal scanner receives the heat in the form of ………………. to measure our body temperature.
                                                                \n16. The inner ………………. in thermos flask protects the contents (tea, coffee, milk) poured in the flask from losing heat through radiation.
                                                                \n17. As there is ………………. between the walls of the flask; neither conduction nor convection of heat takes place.
                                                                \n18. Particles of substances occupies ………………. space when they get heated.
                                                                \n19. Small gaps left between rails in railway tracks, because metal ………………. on heat
                                                                \n20. ………………. are used to measure temperature.
                                                                \n21. The principle involved in working of a thermometer is ………………. .
                                                                \n22. The melting point of ice is ………………. \u00b0C
                                                                \n23. The melting point of ice and boiling point of water in Fahrenheit are ………………. .
                                                                \n24. The melting point of ice and boiling point of water in SI units are ………………. .
                                                                \n25. The formula to convert Celsius to Kelvin is ………………. .
                                                                \n26. The formula to convert Celsius to Fahrenheit is ………………. .
                                                                \n27. ………………. is used in hospitals to measure the temperature of the human body.
                                                                \n28. Clinical Thermometer has a ………………. that prevents the mercury from flowing back into the bulb when it was taken out of the patient\u2019s mouth.
                                                                \n29. After taking readings in six max and min thermometer the indicators I<sub>2<\/sub> and I<sub>1<\/sub> are brought to their original places by using ………………. .
                                                                \n30. The normal temperature of the human body is ………………. .
                                                                \n31. Smoke and hot air moves up because it ………………. on heating and becomes lighter.
                                                                \n32. The force applied by air oh any surface in contact is called ………………. .
                                                                \n33. The air pressure becomes ………………. when it is compressed.
                                                                \n34. When air expands and raises up it creates ………………. .
                                                                \n35. ………………. drives the air high pressure from surrounding to move and occupy that place.
                                                                \n36. Air pressure is measured in height of ………………. level in centimeters
                                                                \n37. ………………. is measured in millimeters by using a rain gauge.
                                                                \n38. The water vapour present in the air is called ………………. .
                                                                \n39. ………………. is used to measure humidity in air and it is expressed in grams per cubic meter.
                                                                \n40. Evaporation of ………………. from our body makes us cool to maintain our body temperature.
                                                                \n41. The day-to-day variations in the components like temperature, humidity, rainfall, wind speed are called ………………. .
                                                                \n42. ………………. forecasting is the application of science and technology to predict the conditions of the atmosphere using components of weather for a given location and time.
                                                                \n43. It is easier to know about weather with the help of ………………. than tables.
                                                                \n44. ………………. study and work on weather and record weather every day.
                                                                \n45. The average weather pattern taken over a long period, say 25 years or more, is called the ………………. of the place.
                                                                \n46. Expansion of IMD is ………………. .
                                                                \n47. The abnormal variation in the components of climate is called ………………. .
                                                                \nAnswer:<\/p>\n

                                                                  \n
                                                                1. hotter, cooler<\/li>\n
                                                                2. Joules or calories<\/li>\n
                                                                3. temperature<\/li>\n
                                                                4. hotness or coldness<\/li>\n
                                                                5. \u00b0C<\/li>\n
                                                                6. \u00b0F<\/li>\n
                                                                7. conductivity<\/li>\n
                                                                8. insulators<\/li>\n
                                                                9. conduction<\/li>\n
                                                                10. Thermal contact<\/li>\n
                                                                11. poor conductor<\/li>\n
                                                                12. currents<\/li>\n
                                                                13. medium<\/li>\n
                                                                14. radiation<\/li>\n
                                                                15. radiation<\/li>\n
                                                                16. silver coating<\/li>\n
                                                                17. no medium or vacuum<\/li>\n
                                                                18. more<\/li>\n
                                                                19. expand<\/li>\n
                                                                20. Thermometers<\/li>\n
                                                                21. expansion of liquids on heating<\/li>\n
                                                                22. 0<\/li>\n
                                                                23. 32\u00b0F, 212\u00b0F<\/li>\n
                                                                24. 273K, 373K<\/li>\n
                                                                25. K \u00b0C + 273<\/li>\n
                                                                26. \"AP<\/li>\n
                                                                27. Clinical Thermometer<\/li>\n
                                                                28. kink<\/li>\n
                                                                29. a magnet<\/li>\n
                                                                30. 37\u00b0C or 98.4\u00b0F<\/li>\n
                                                                31. expands<\/li>\n
                                                                32. air pressure<\/li>\n
                                                                33. more<\/li>\n
                                                                34. low pressure<\/li>\n
                                                                35. Low pressure<\/li>\n
                                                                36. mercury<\/li>\n
                                                                37. Rainfall<\/li>\n
                                                                38. Humidity<\/li>\n
                                                                39. Hygrometer<\/li>\n
                                                                40. Sweat<\/li>\n
                                                                41. weather<\/li>\n
                                                                42. Weather<\/li>\n
                                                                43. graphs<\/li>\n
                                                                44. Meteorologists<\/li>\n
                                                                45. Climate<\/li>\n
                                                                46. Indian Meteorological Department<\/li>\n
                                                                47. climate change<\/li>\n<\/ol>\n

                                                                  III. Match the following<\/span><\/p>\n

                                                                  1.<\/p>\n\n\n\n\n\n\n\n
                                                                  Group – A<\/td>\nGroup – B<\/td>\n<\/tr>\n
                                                                  1) heat<\/td>\na) cm of mercury level<\/td>\n<\/tr>\n
                                                                  2) temperature<\/td>\nb) Kelvin<\/td>\n<\/tr>\n
                                                                  3) air pressure<\/td>\nc) mm<\/td>\n<\/tr>\n
                                                                  4) rain fall<\/td>\nd) Joule<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                                                                  Answer:<\/p>\n\n\n\n\n\n\n\n
                                                                  Group – A<\/td>\nGroup – B<\/td>\n<\/tr>\n
                                                                  1) heat<\/td>\nd) Joule<\/td>\n<\/tr>\n
                                                                  2) temperature<\/td>\nb) Kelvin<\/td>\n<\/tr>\n
                                                                  3) air pressure<\/td>\na) cm of mercury level<\/td>\n<\/tr>\n
                                                                  4) rain fall<\/td>\nc) mm<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                                                                  2.<\/p>\n\n\n\n\n\n\n\n
                                                                  Group – A<\/td>\nGroup – B<\/td>\n<\/tr>\n
                                                                  1) humidity<\/td>\na) barometer<\/td>\n<\/tr>\n
                                                                  2) temperature<\/td>\nb) hygrometer<\/td>\n<\/tr>\n
                                                                  3) air pressure<\/td>\nc) rain gauge<\/td>\n<\/tr>\n
                                                                  4) rainfall<\/td>\nd) thermometer<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                                                                  Answer:<\/p>\n\n\n\n\n\n\n\n
                                                                  Group – A<\/td>\nGroup – B<\/td>\n<\/tr>\n
                                                                  1) humidity<\/td>\nb) hygrometer<\/td>\n<\/tr>\n
                                                                  2) temperature<\/td>\nd) thermometer<\/td>\n<\/tr>\n
                                                                  3) air pressure<\/td>\na) barometer<\/td>\n<\/tr>\n
                                                                  4) rainfall<\/td>\nc) rain gauge<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                                                                  3.<\/p>\n\n\n\n\n\n\n\n
                                                                  Group – A<\/td>\nGroup – B<\/td>\n<\/tr>\n
                                                                  1) water<\/td>\na) radiation<\/td>\n<\/tr>\n
                                                                  2) heat<\/td>\nb) convection<\/td>\n<\/tr>\n
                                                                  3) metal<\/td>\nc) expansion<\/td>\n<\/tr>\n
                                                                  4) vacuum<\/td>\nd) conduction<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                                                                  Answer:<\/p>\n\n\n\n\n\n\n\n
                                                                  Group – A<\/td>\nGroup – B<\/td>\n<\/tr>\n
                                                                  1) water<\/td>\nb) convection<\/td>\n<\/tr>\n
                                                                  2) heat<\/td>\nc) expansion<\/td>\n<\/tr>\n
                                                                  3) metal<\/td>\nd) conduction<\/td>\n<\/tr>\n
                                                                  4) vacuum<\/td>\na) radiation<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                                                                  4.<\/p>\n\n\n\n\n\n\n\n
                                                                  Group – A<\/td>\nGroup – B<\/td>\n<\/tr>\n
                                                                  1) nail<\/td>\na) clinical thermometer<\/td>\n<\/tr>\n
                                                                  2) cloth<\/td>\nb) lab thermometer<\/td>\n<\/tr>\n
                                                                  3) mercury<\/td>\nc) conductor<\/td>\n<\/tr>\n
                                                                  4) alcohol<\/td>\nd) insulator<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                                                                  Answer:<\/p>\n\n\n\n\n\n\n\n
                                                                  Group – A<\/td>\nGroup – B<\/td>\n<\/tr>\n
                                                                  1) nail<\/td>\nc) conductor<\/td>\n<\/tr>\n
                                                                  2) cloth<\/td>\nd) insulator<\/td>\n<\/tr>\n
                                                                  3) mercury<\/td>\na) clinical thermometer<\/td>\n<\/tr>\n
                                                                  4) alcohol<\/td>\nb) lab thermometer<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                                                                  5.<\/p>\n\n\n\n\n\n\n\n
                                                                  Group – A<\/td>\nGroup – B<\/td>\n<\/tr>\n
                                                                  1) weather<\/td>\na) low pressure<\/td>\n<\/tr>\n
                                                                  2) climate<\/td>\nb) long period<\/td>\n<\/tr>\n
                                                                  3) wind<\/td>\nc) water vapour<\/td>\n<\/tr>\n
                                                                  4) humidity<\/td>\nd) rapid change<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                                                                  Answer:<\/p>\n\n\n\n\n\n\n\n
                                                                  Group – A<\/td>\nGroup – B<\/td>\n<\/tr>\n
                                                                  1) weather<\/td>\nd) rapid change<\/td>\n<\/tr>\n
                                                                  2) climate<\/td>\nb) long period<\/td>\n<\/tr>\n
                                                                  3) wind<\/td>\na) low pressure<\/td>\n<\/tr>\n
                                                                  4) humidity<\/td>\nc) water vapour<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                                                                  6.<\/p>\n\n\n\n\n\n\n\n
                                                                  Group – A<\/td>\nGroup – B<\/td>\n<\/tr>\n
                                                                  1) gas expansion<\/td>\na) alcohol thermometer<\/td>\n<\/tr>\n
                                                                  2) liquid expansion<\/td>\nb) parachute<\/td>\n<\/tr>\n
                                                                  3) solid expansion<\/td>\nc) railway rails<\/td>\n<\/tr>\n
                                                                  4) gas contraction<\/td>\nd) LPG cylinder<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                                                                  Answer:<\/p>\n\n\n\n\n\n\n\n
                                                                  Group – A<\/td>\nGroup – B<\/td>\n<\/tr>\n
                                                                  1) gas expansion<\/td>\nb) parachute<\/td>\n<\/tr>\n
                                                                  2) liquid expansion<\/td>\na) alcohol thermometer<\/td>\n<\/tr>\n
                                                                  3) solid expansion<\/td>\nc) railway rails<\/td>\n<\/tr>\n
                                                                  4) gas contraction<\/td>\nd) LPG cylinder<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                                                                  7.<\/p>\n\n\n\n\n\n\n\n
                                                                  Group – A<\/td>\nGroup – B<\/td>\n<\/tr>\n
                                                                  1) Kelvin<\/td>\na) \u00b0F<\/td>\n<\/tr>\n
                                                                  2) Fahrenheit<\/td>\nb) K<\/td>\n<\/tr>\n
                                                                  3) Celsius<\/td>\nc) J<\/td>\n<\/tr>\n
                                                                  4) Heat<\/td>\nd) \u00b0c<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                                                                  Answer:<\/p>\n\n\n\n\n\n\n\n
                                                                  Group – A<\/td>\nGroup – B<\/td>\n<\/tr>\n
                                                                  1) Kelvin<\/td>\nb) K<\/td>\n<\/tr>\n
                                                                  2) Fahrenheit<\/td>\na) \u00b0F<\/td>\n<\/tr>\n
                                                                  3) Celsius<\/td>\nd) \u00b0c<\/td>\n<\/tr>\n
                                                                  4) Heat<\/td>\nc) J<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                                                                  Do You Know?<\/span><\/p>\n

                                                                  \u2192 Heat is measured In Joules or Calories with calorimeter.<\/p>\n

                                                                  \u2192 Warm air is lighter than cold air. This property of air is used in flying of hot air balloons. It contains a bag which is called as envelope, and it is filled with heated air. There is a basket under the envelope which carries passengers and a source of heat.<\/p>\n

                                                                  \u2192 Formulas for temperature conversion<\/p>\n

                                                                  1) Celsius to Fahrenheit \"AP
                                                                  \n2) Celsius to Kelvin C=K – 273<\/p>\n

                                                                  \u2192 Now a days cameras have been developed to detect heat. Those are called thermal- cameras.<\/p>\n

                                                                  \"AP<\/p>\n

                                                                  \u2192 The Indian Meteorological Department (IMD) studies climate of our country. 23rd March is celebrated as World Meteorological Day.<\/p>\n","protected":false},"excerpt":{"rendered":"

                                                                  These AP 7th Class Science Important Questions 9th Lesson Heat, Temperature and Climate will help students prepare well for the exams. AP Board 7th Class Science 9th Lesson Important Questions and Answers Heat, Temperature and Climate Question 1. What is heat? Answer: Heat is a form of energy which flows from hotter body (higher energy) … Read more<\/a><\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":""},"categories":[13],"tags":[],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/apboardsolutions.in\/wp-json\/wp\/v2\/posts\/20245"}],"collection":[{"href":"https:\/\/apboardsolutions.in\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/apboardsolutions.in\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/apboardsolutions.in\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/apboardsolutions.in\/wp-json\/wp\/v2\/comments?post=20245"}],"version-history":[{"count":1,"href":"https:\/\/apboardsolutions.in\/wp-json\/wp\/v2\/posts\/20245\/revisions"}],"predecessor-version":[{"id":20246,"href":"https:\/\/apboardsolutions.in\/wp-json\/wp\/v2\/posts\/20245\/revisions\/20246"}],"wp:attachment":[{"href":"https:\/\/apboardsolutions.in\/wp-json\/wp\/v2\/media?parent=20245"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/apboardsolutions.in\/wp-json\/wp\/v2\/categories?post=20245"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/apboardsolutions.in\/wp-json\/wp\/v2\/tags?post=20245"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}