JEE Main & Advanced Physics Transmission of Heat Question Bank

done Convection Total Questions - 13

• question_answer1)
  It is hotter for the same distance over the top of a fire than it is in the side of it, mainly because [NCERT 1976, 79, 80; AIIMS 2000]
  A)
             Air conducts heat upwards done clear
  B)
             Heat is radiated upwards done clear
  C)
             Convection takes more heat upwards done clear
  D)
             Convection, conduction and radiation all contribute significantly transferring heat upwards done clear
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• question_answer2)
  One likes to sit under sunshine in winter season, because
  A)
             The air surrounding the body is hot by which body gets heat done clear
  B)
             We get energy by sun done clear
  C)
             We get heat by conduction by sun done clear
  D)
             None of the above done clear
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• question_answer3)
  Air is bad conductor of heat or partly conducts heat, still vacuum is to be placed between the walls of the thermos flask because
  A)
             It is difficult to fill the air between the walls of thermos flask done clear
  B)
             Due to more pressure of air, the thermos can get crack done clear
  C)
             By convection, heat can flow through air done clear
  D)
             On filling the air, there is no advantage done clear
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• question_answer4)
  While measuring the thermal conductivity of a liquid, we keep the upper part hot and lower part cool, so that [CPMT 1985; MP PMT/PET 1988]
  A)
             Convection may be stopped done clear
  B)
             Radiation may be stopped done clear
  C)
             Heat conduction is easier downwards done clear
  D)
             It is easier and more convenient to do so done clear
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• question_answer5)
  For proper ventilation of building, windows must be open near the bottom and top of the walls so as to let pass
  A)
             In more air done clear
  B)
             In cool air near the bottom and hot air out near the roof done clear
  C)
             In hot air near the roof and cool air out near the bottom done clear
  D)
             Out hot air near the roof done clear
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• question_answer6)
  The layers of atmosphere are heated through [MP PET 1986]
  A)
             Convection                            done clear
  B)
             Conduction done clear
  C)
             Radiation                                done clear
  D)
             (b) and (c) both done clear
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• question_answer7)
    Mode of transmission of heat, in which heat is carried by the moving particles, is               [KCET 1999]
  A)
             Radiation                                done clear
  B)
             Conduction done clear
  C)
             Convection                            done clear
  D)
             Wave motion done clear
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• question_answer8)
  In a closed room, heat transfer takes place by    [BHU 2001]
  A)
             Conduction                            done clear
  B)
             Convection done clear
  C)
             Radiation                                done clear
  D)
             All of these done clear
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• question_answer9)
  In heat transfer, which method is based on gravitation [CBSE PMT 2000]
  A)
             Natural convection             done clear
  B)
             Conduction done clear
  C)
             Radiation                                done clear
  D)
             Stirring of liquids done clear
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• question_answer10)
  When fluids are heated from the bottom, convection currents are produced because [UPSEAT 2000]
  A)
             Molecular motion of fluid becomes aligned done clear
  B)
             Molecular collisions take place within the fluid done clear
  C)
             Heated fluid becomes more dense than the cold fluid above it done clear
  D)
             Heated fluid becomes less dense than the cold fluid above it done clear
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• question_answer11)
  If a liquid is heated in weightlessness, the heat is transmitted through   [RPMT1996]
  A)
             Conduction done clear
  B)
             Convection done clear
  C)
             Radiation done clear
  D)
             Neither, because the liquid cannot be heated in weightlessness done clear
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• question_answer12)
  The rate of loss of heat from a body cooling under conditions of forced convection is proportional  to its  heat capacity  surface area  absolute temperature  excess of temperature over that of surrounding : state if  [NCERT 1982]
  A)
             A, B, C are correct               done clear
  B)
             Only A and C are correct done clear
  C)
             Only B and D are correct done clear
  D)
             Only D is correct done clear
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• question_answer13)
  In which of the following process, convection does not take place primarily  [IIT-JEE (Screening) 2005]
  A)
             Sea and land breeze done clear
  B)
             Boiling of water done clear
  C)
             Warming of glass of bulb due to filament done clear
  D)
             Heating air around a furnace done clear
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