7th Class Science Heat Question Bank

done Heat Total Questions - 40

• question_answer1)
  Which of the following conditions enables heat to flow from one body to another identical body?
  A)
   The difference in the temperatures of the two bodies done clear
  B)
   The difference in the pressures exerted on the two bodies done clear
  C)
   The difference in the densities of the two bodies done clear
  D)
   The difference in the sizes of the two bodies done clear
  View Solution play_arrow

• question_answer2)
  When you heat water in a pot, it boils. What can you infer from the above observation?
  A)
   Heat is a form of energy. done clear
  B)
   Water can boil by itself. done clear
  C)
   Water develops heat on its own. done clear
  D)
   Water is a universal solvent. done clear
  View Solution play_arrow

• question_answer3)
  What must be done to enable mercury in a glass thermometer to respond quickly to changes in temperature?
  A)
   The bore should be narrow. done clear
  B)
   The wall of stem should be thin. done clear
  C)
   The bulb should contain a lot of mercury. done clear
  D)
   The wall of glass bulb should be thin. done clear
  View Solution play_arrow

• question_answer4)
  Why do cooking vessels usually have copper bottoms?
  A)
   Copper has low melting point. done clear
  B)
   Copper is an insulator of heat. done clear
  C)
   Copper is a good conductor of heat. done clear
  D)
   Copper is cheap. done clear
  View Solution play_arrow

• question_answer5)
  For the effective radiation of heat by an electric room heater, which of the following needs to be done?
  A)
   Keep it clean. done clear
  B)
   Polish it to shine. done clear
  C)
   Paint it green. done clear
  D)
   Paint it black. done clear
  View Solution play_arrow

• question_answer6)
  What is the measure of the degree of hotness or coldness of a body called?
  A)
   Heat energy      done clear
  B)
   Celsius done clear
  C)
          Kelvin                   done clear
  D)
          Temperature done clear
  View Solution play_arrow

• question_answer7)
  Why are two thin blankets piled together warmer than a single one of the same total thickness as the two?
  A)
   Air is enclosed in between them. done clear
  B)
   The outer thin blanket transfers heat faster. done clear
  C)
   Air acts as medium to transfer the energy. done clear
  D)
   There is a decrease in the sensation of touch. done clear
  View Solution play_arrow

• question_answer8)
  Conduction of heat does not take place in
  A)
   copper.                               done clear
  B)
   iron.                      done clear
  C)
   aluminium.    done clear
  D)
          vacuum. done clear
  View Solution play_arrow

• question_answer9)
  Why are asbestos sheets used for laying the roofs of some houses?
  A)
   They are good conductors of heat. done clear
  B)
   They are bad conductors of heat. done clear
  C)
   They are costly. done clear
  D)
   They have nice look. done clear
  View Solution play_arrow

• question_answer10)
  Why is mercury widely used in clinical thermometers?

  (i) Mercury is easily available in pure form.

  (ii) Mercury is opaque.

  (iii) Mercury has a constant coefficient of expansion.

  A)
   Only (i) and (ii) done clear
  B)
   Only (ii) and (iii) done clear
  C)
          Only (i) and (iii) done clear
  D)
          (i), (ii) and (iii) done clear
  View Solution play_arrow

• question_answer11)
  Why is it hotter over the top of a fire than at the same distance on the sides?
  A)
   Due to convection of heat done clear
  B)
   Due to conduction of heat done clear
  C)
   Due to radiation of heat done clear
  D)
   Due to conduction, convection and radiation of heat done clear
  View Solution play_arrow

• question_answer12)
  Which of the following is NOT a scale of temperature?
  A)
   Kelvin scale done clear
  B)
   Celsius scale done clear
  C)
   Fahrenheit scale done clear
  D)
   Richter scale done clear
  View Solution play_arrow

• question_answer13)
  How many parts does a Celsius scale have?
  A)
   100                                        done clear
  B)
   273                        done clear
  C)
   180                        done clear
  D)
          50                          done clear
  View Solution play_arrow

• question_answer14)
  What is the range of a clinical thermometer?
  A)
  \[0-100{{\,}^{o}}C\]      done clear
  B)
  \[32-214{{\,}^{o}}F\]      done clear
  C)
  \[0-273\text{ }{{\,}^{o}}C\]       done clear
  D)
         \[35-42\text{ }{{\,}^{o}}C\]                          done clear
  View Solution play_arrow

• question_answer15)
  Identify the normal human body temperature.
  A)
  \[32{{\,}^{o}}F\]                               done clear
  B)
  \[212{{\,}^{o}}F\]             done clear
  C)
         \[100.4{{\,}^{o}}F\]         done clear
  D)
         \[~98.4{{\,}^{o}}F\]          done clear
  View Solution play_arrow

• question_answer16)
  X is the mode of transmission of heat that takes place by the movement of hot particles. Identify X.
  A)
   Conduction        done clear
  B)
   Convection        done clear
  C)
          Radiation            done clear
  D)
          Expansion                          done clear
  View Solution play_arrow

• question_answer17)
  By which mode of transmission of heat does air get heated up?
  A)
   Conduction        done clear
  B)
   Convection        done clear
  C)
          Radiation            done clear
  D)
          Diffusion done clear
  View Solution play_arrow

• question_answer18)
  In cold countries, why are steam pipes covered with asbestos or glass wool?
  A)
   To prevent bursting due to expansion done clear
  B)
   To prevent heat loss due to conduction done clear
  C)
   To prevent radiation done clear
  D)
   All of the above done clear
  View Solution play_arrow

• question_answer19)
  Windows having double glass panes with some space between them is called double glazing. Why do windows in cold countries have double glazing?
  A)
   For the conduction of heat done clear
  B)
   For the insulation of heat done clear
  C)
   For the radiation of heat done clear
  D)
   All of the above done clear
  View Solution play_arrow

• question_answer20)
  Which of these phenomena is caused due to convection?
  A)
   Ventilation         done clear
  B)
   Trade winds      done clear
  C)
          Ocean currents done clear
  D)
          All of the above               done clear
  View Solution play_arrow

• question_answer21)
  Which of the following is a good conductor of heat?
  A)
   Plastic                                  done clear
  B)
   Water  done clear
  C)
                          Glass                    done clear
  D)
          Copper done clear
  View Solution play_arrow

• question_answer22)
  What is the mode by which heat is transferred in solid substances?
  A)
   Conduction        done clear
  B)
   Convection        done clear
  C)
   Radiation            done clear
  D)
          Insulation done clear
  View Solution play_arrow

• question_answer23)
  Which of the following is a bad conductor of heat?
  A)
   Wood                                   done clear
  B)
   Aluminium         done clear
  C)
          Iron                       done clear
  D)
          Bronze                 done clear
  View Solution play_arrow

• question_answer24)
  When two objects are in thermal contact, how is the heat from one body to the other body transferred?
  A)
   Conduction        done clear
  B)
   Convection        done clear
  C)
          Radiation            done clear
  D)
          Insulation done clear
  View Solution play_arrow

• question_answer25)
  How is heat conducted in solids?
  A)
   From a high pressure to a low pressure region done clear
  B)
   From a colder to a hotter region done clear
  C)
   From a hotter to a colder region done clear
  D)
   From a low pressure to a high pressure region done clear
  View Solution play_arrow

• question_answer26)
  Which is the best conductor of heat?
  A)
   Silver                                    done clear
  B)
   Iron                       done clear
  C)
   Aluminium           done clear
  D)
   Copper                                done clear
  View Solution play_arrow

• question_answer27)
  Why are tea cups never made of metals?
  A)
   Metals are good conductors of heat. done clear
  B)
   Metals are lustrous. done clear
  C)
   Metals are expensive. done clear
  D)
   Metals have high melting point. done clear
  View Solution play_arrow

• question_answer28)
  In which of the following is the rate of heat transfer more?
  A)
   Glass                                    done clear
  B)
   Copper                done clear
  C)
          Plastic                  done clear
  D)
          Wood done clear
  View Solution play_arrow

• question_answer29)
  Rooms are fitted with ventilators to let hot air out. What is the phenomenon involved in the above?
  A)
   Conduction        done clear
  B)
          Convection                        done clear
  C)
          Radiation                            done clear
  D)
          Condensation done clear
  View Solution play_arrow

• question_answer30)
  What enables birds to glide effortlessly in the air?
  A)
   Conduction of heat in the air done clear
  B)
          Radiation through the atmosphere done clear
  C)
          Convection currents of air done clear
  D)
          More sugar in their body cells done clear
  View Solution play_arrow

• question_answer31)
  When we touch a steel rod and a sheet of paper simultaneously, why do we feel that the steel rod is colder than the sheet of paper?
  A)
   Steel, being a good conductor, absorbs heat from our body. done clear
  B)
          Paper being a good conductor, absorbs more heat from our body. done clear
  C)
          Heat flows from steel to our body. done clear
  D)
          Heat flows from the paper to our body. done clear
  View Solution play_arrow

• question_answer32)
  What is the energy conversion taking place in an electric heater?
  A)
   Chemical energy is converted to electrical energy. done clear
  B)
          Electrical energy is converted to chemical energy. done clear
  C)
          Heat energy is converted to electrical energy. done clear
  D)
          Electrical energy is converted to heat energy. done clear
  View Solution play_arrow

• question_answer33)
  Which of the following statements is true about convection?
  A)
   In solids, heat is transferred only by convection. done clear
  B)
          Convection occurs in cold liquids. done clear
  C)
          Convection requires a medium for transmission. done clear
  D)
          Heat flows from the cold end to the hot end in a substance. done clear
  View Solution play_arrow

• question_answer34)
  Riaz needs a box which can absorb the heat from the sun very fast but lose it very slowly. How should the outer and the inner surface of the box be colored so that he gets the best result?
  A)
   Outer-Silver/Inner-Silver done clear
  B)
          Outer-Black/Inner-Black done clear
  C)
          Outer - Silver, Inner ? Black done clear
  D)
          Outer - Black, Inner ? Silver done clear
  View Solution play_arrow

• question_answer35)
  Which part of a thermos flask prevents loss of heat through radiation?
  A)
   Vacuum done clear
  B)
          Cork stopper done clear
  C)
          Double glass walls done clear
  D)
          Shiny/silvery wall done clear
  View Solution play_arrow

• question_answer36)
  A What happens when the temperature of a substance is increased?
  A)
   Kinetic energy of the molecules of the substance increases. done clear
  B)
          Kinetic energy of the molecules of the substance decreases. done clear
  C)
          The amplitude of vibrations of molecules of the substance about their mean position decreases. done clear
  D)
          It does not cause any change. done clear
  View Solution play_arrow

• question_answer37)
  What is temperature?
  A)
   The rate of expansion of an object done clear
  B)
          The loss of heat energy done clear
  C)
          The volume of a gas occupied done clear
  D)
          The degree of hotness or coldness of a body done clear
  View Solution play_arrow

• question_answer38)
  Why do solar panels have black surfaces?
  A)
   Because they are good absorbers of heat done clear
  B)
          Because they are bad absorbers of heat done clear
  C)
          Because they are good reflectors of heat done clear
  D)
          Because they are bad radiators of heat done clear
  View Solution play_arrow

• question_answer39)
  There are four cups made of different materials: Silver, aluminium, wood and copper. In which of them will tea remain warm for a longer time?
  A)
   Silver cup                            done clear
  B)
          Aluminium cup done clear
  C)
          Wooden cup     done clear
  D)
          Copper cup done clear
  View Solution play_arrow

• question_answer40)
  The base of a cooking vessel is usually black and dull. Why is it made this way?
  A)
  Black is a favorite color of most of the consumers. done clear
  B)
  Dull surface prevent slipping of vessels. done clear
  C)
  Black and dull surfaces are good absorbers of heat. done clear
  D)
  Black and dull surfaces are good reflectors of heat. done clear
  View Solution play_arrow