JEE Main & Advanced Physics Transmission of Heat Question Bank

done Radiation General Kirchoff's law Black body Total Questions - 38

• question_answer1)
  On a clear sunny day, an object at temperature T is placed on the top of a high mountain. An identical object at the same temperature is placed at the foot of mountain. If both the objects are exposed to sun-rays for two hours in an identical manner, the object at the top of the mountain will register a temperature                                         [CPMT 1988]
  A)
             Higher than the object at the foot done clear
  B)
             Lower than the object at the foot done clear
  C)
             Equal to the object at the foot done clear
  D)
             None of the above done clear
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• question_answer2)
  The velocity of heat radiation in vacuum is  [EAMCET 1982; KCET 1998]
  A)
             Equal to that of light          done clear
  B)
             Less than that of light done clear
  C)
             Greater than that of light done clear
  D)
             Equal to that of sound done clear
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• question_answer3)
  In which process, the rate of transfer of heat is maximum [EAMCET 1977; MP PMT 1994; MH CET 2001]
  A)
             Conduction done clear
  B)
             Convection done clear
  C)
             Radiation done clear
  D)
             In all these, heat is transferred with the same velocity done clear
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• question_answer4)
  Which of the following is the correct device for the detection of thermal radiation            [Manipal MEE 1995, UPSEAT 2000]
  A)
             Constant volume thermometer done clear
  B)
             Liquid-in-glass thermometer done clear
  C)
             Six's maximum and minimum thermometer done clear
  D)
             Thermopile done clear
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• question_answer5)
   A thermos flask is polished well                             [AFMC 1996]
  A)
             To make attractive             done clear
  B)
             For shining done clear
  C)
             To absorb all radiations from outside done clear
  D)
             To reflect all radiations from outside done clear
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• question_answer6)
  Heat travels through vacuum by        [AIIMS 1998; CPMT 2003]
  A)
             Conduction                            done clear
  B)
             Convection done clear
  C)
             Radiation                                done clear
  D)
             Both (a) and (b) done clear
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• question_answer7)
  The energy supply being cut-off, an electric heater element cools down to the temperature of its surroundings, but it will not cool further because                                    [CPMT 2001]
  A)
             Supply is cut off  done clear
  B)
             It is made of metal done clear
  C)
             Surroundings are radiating done clear
  D)
             Element & surroundings have same temp. done clear
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• question_answer8)
  We consider the radiation emitted by the human body. Which of the following statements is true            [CBSE PMT 2003]
  A)
             The radiation is emitted only during the day done clear
  B)
             The radiation is emitted during the summers and absorbed during the winters done clear
  C)
             The radiation emitted lies in the ultraviolet region and hence is not visible done clear
  D)
             The radiation emitted is in the infra-red region done clear
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• question_answer9)
  The earth radiates in the infra-red region of the spectrum. The spectrum is correctly given by  [RPET 2002; AIEEE 2003]
  A)
             Wien?s law                             done clear
  B)
             Rayleigh jeans law done clear
  C)
             Planck?s law of radiation  done clear
  D)
             Stefan?s law of radiation done clear
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• question_answer10)
  Infrared radiation is detected by                             [AIEEE 2002]
  A)
             Spectrometer                       done clear
  B)
             Pyrometer done clear
  C)
             Nanometer                           done clear
  D)
             Photometer done clear
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• question_answer11)
  Pick out the statement which is not true              [KCET 2002]
  A)
             IR radiations are used for long distance photography done clear
  B)
             IR radiations arise due to inner electron transitions in atoms done clear
  C)
             IR radiations are detected by using a bolometer done clear
  D)
             Sun is the natural source of IR radiation done clear
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• question_answer12)
  A hot and a cold body are kept in vacuum separated from each other. Which of the following cause decrease in temperature of the hot body                                  [AFMC 2005]
  A)
             Radiation done clear
  B)
             Convection done clear
  C)
             Conduction done clear
  D)
             Temperature remains unchanged done clear
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• question_answer13)
  Good absorbers of heat are                                [J & K CET 2002]
  A)
             Poor emitters                       done clear
  B)
             Non-emitters done clear
  C)
             Good emitters                     done clear
  D)
             Highly polished done clear
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• question_answer14)
  For a perfectly black body, its absorptive power is [MP PMT 1989, 92; RPMT 2001; RPET 2001, 03; AFMC 2003]
  A)
             1     done clear
  B)
             0.5 done clear
  C)
             0     done clear
  D)
             Infinity done clear
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• question_answer15)
  Certain substance emits only the wavelengths \[{{\lambda }_{1}},\ {{\lambda }_{2}},\ {{\lambda }_{3}}\] and \[{{\lambda }_{4}}\] when it is at a high temperature. When this substance is at a colder temperature, it will absorb only the following wavelengths                                                                 [MP PET 1990]
  A)
             \[{{\lambda }_{1}}\]           done clear
  B)
             \[{{\lambda }_{2}}\] done clear
  C)
             \[{{\lambda }_{1}}\] and \[{{\lambda }_{2}}\]            done clear
  D)
             \[{{\lambda }_{1}},\ {{\lambda }_{2}},\ {{\lambda }_{3}}\] and \[{{\lambda }_{4}}\] done clear
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• question_answer16)
  As compared to the person with white skin, the person with black skin will experience                  [CPMT 1988]
  A)
             Less heat and more cold  done clear
  B)
             More heat and more cold done clear
  C)
             More heat and less cold   done clear
  D)
             Less heat and less cold done clear
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• question_answer17)
  Relation between emissivity \[e\] and absorptive power \[a\] is (for black body)
  A)
             \[e=a\]                                    done clear
  B)
             \[e=\frac{1}{a}\] done clear
  C)
             \[e={{a}^{2}}\]                     done clear
  D)
             \[a={{e}^{2}}\] done clear
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• question_answer18)
  Which of the following statements is wrong     [BCECE 2001]
  A)
             Rough surfaces are better radiators than smooth surface done clear
  B)
             Highly polished mirror like surfaces are very good radiators done clear
  C)
             Black surfaces are better absorbers than white ones done clear
  D)
             Black surfaces are better radiators than white done clear
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• question_answer19)
  Half part of ice block is covered with black cloth and rest half is covered with white cloth and then it is kept in sunlight. After some time clothes are removed to see the melted ice. Which of the following statements is correct
  A)
             Ice covered with white cloth will melt more done clear
  B)
             Ice covered with black cloth will melt more done clear
  C)
             Equal ice will melt under both clothes done clear
  D)
             It will depend on the temperature of surroundings of ice done clear
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• question_answer20)
  If between wavelength \[\lambda \]and \[\lambda +d\lambda \], \[{{e}_{\lambda }}\]and \[{{a}_{\lambda }}\] be the emissive and absorptive powers of a body and \[{{E}_{\lambda }}\] be the emissive power of a perfectly black body, then according to Kirchoff's law, which is true                                     [RPMT 1998; MP PET 1991]
  A)
             \[{{e}_{\lambda }}={{a}_{\lambda }}={{E}_{\lambda }}\]     done clear
  B)
             \[{{e}_{\lambda }}{{E}_{\lambda }}={{a}_{\lambda }}\] done clear
  C)
             \[{{e}_{\lambda }}={{a}_{\lambda }}{{E}_{\lambda }}\]       done clear
  D)
             \[{{e}_{\lambda }}{{a}_{\lambda }}{{E}_{\lambda }}\]= constant done clear
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• question_answer21)
  When \[p\]calories of heat is given to a body, it absorbs \[q\] calories; then the absorbtion power of body will be
  A)
             \[p/q\]                                    done clear
  B)
             \[q/p\] done clear
  C)
             \[{{p}^{2}}/{{q}^{2}}\]      done clear
  D)
             \[{{q}^{2}}/{{p}^{2}}\] done clear
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• question_answer22)
  Distribution of energy in the spectrum of a black body can be correctly represented by                  [MP PMT 1989]
  A)
             Wien's law                             done clear
  B)
             Stefan's law done clear
  C)
             Planck's law                           done clear
  D)
             Kirchhoff's law done clear
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• question_answer23)
  In rainy season, on a clear night the black seat of a bicycle becomes wet because
  A)
             It absorbs water vapour done clear
  B)
             Black seat is good absorber of heat done clear
  C)
             Black seat is good radiator of heat energy done clear
  D)
             None of the above done clear
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• question_answer24)
  There is a rough black spot on a polished metallic plate. It is heated upto 1400 K approximately and then at once taken in a dark room. Which of the following statements is true  [NCERT 1984; CPMT 1998]
  A)
             In comparison with the plate, the spot will shine more done clear
  B)
             In camparison with the plate, the spot will appear more black done clear
  C)
             The spot and the plate will be equally bright done clear
  D)
             The plate and the black spot can not be seen in the dark room done clear
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• question_answer25)
  At a certain temperature for given wave length, the ratio of emissive power of a body to emissive power of black body in same circumstances is known as                        [RPMT 1997]
  A)
             Relative emissivity              done clear
  B)
             Emissivity done clear
  C)
             Absorption coefficient      done clear
  D)
             Coefficient of reflection done clear
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• question_answer26)
   The cause of Fraunhoffer lines is [RPMT 1996; EAMCET 2001]
  A)
             Reflection of radiations by chromosphere done clear
  B)
             Absorption of radiations by chromosphere done clear
  C)
             Emission of radiations by chromosphere done clear
  D)
             Transmission of radiations by chromosphere done clear
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• question_answer27)
  Two thermometers A and B are exposed in sun light. The valve of A is painted black, But that of B is not painted. The correct statement regarding this case is [BHU (Med.) 1999; MH CET 1999]
  A)
             Temperature of A will rise faster than B but the final temperature will be the same in both done clear
  B)
             Both A and B show equal rise in beginning done clear
  C)
             Temperature of A will remain more than B done clear
  D)
             Temperature of B will rise faster done clear
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• question_answer28)
  There is a black spot on a body. If the body is heated and carried in dark room then it glows more. This can be explained on the basis of                                                                 [RPET 2000]
  A)
             Newton?s law of cooling  done clear
  B)
             Wien?s law done clear
  C)
             Kirchoff?s law                        done clear
  D)
             Stefan?s done clear
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• question_answer29)
  When red glass is heated in dark room it will seem [RPET 2000]
  A)
             Green                                      done clear
  B)
             Purple done clear
  C)
             Black                                         done clear
  D)
             Yellow done clear
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• question_answer30)
  A hot body will radiate heat most rapidly if its surface is [UPSEAT 1999, 2000]
  A)
             White & polished                done clear
  B)
             White & rough done clear
  C)
             Black & polished                  done clear
  D)
             Black & rough done clear
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• question_answer31)
  A body, which emits radiations of all possible wavelengths, is known as                                 [CPMT 2001; Pb. PET 2002]
  A)
             Good conductor                  done clear
  B)
             Partial radiator done clear
  C)
             Absorber of photons         done clear
  D)
             Perfectly black-body done clear
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• question_answer32)
  Which of the following is the example of ideal black body [AIEEE 2002; CBSE PMT 2002]
  A)
              Kajal                                        done clear
  B)
             Black board done clear
  C)
             A pin hole in a box              done clear
  D)
             None of these done clear
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• question_answer33)
  An ideal black body at room temperature is thrown into a furnace. It is observed that     [IIT-JEE (Screening) 2002]
  A)
             Initially it is the darkest body and at later times the brightest done clear
  B)
             It is the darkest body at all times done clear
  C)
             It cannot be distinguished at all times done clear
  D)
             Initially it is the darkest body and at later times it cannot be distinguished done clear
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• question_answer34)
  Absorption co-efficient of an open window is... [KCET 2004]
  A)
             Zero                                          done clear
  B)
             0.5 done clear
  C)
             1     done clear
  D)
             0.25 done clear
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• question_answer35)
  Which of the prism is used to see infra-red spectrum of light  [RPMT 2000]
  A)
             Rock-salt                                 done clear
  B)
             Nicol done clear
  C)
             Flint                                          done clear
  D)
             Crown done clear
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• question_answer36)
  Which of the following statement is correct      [RPMT 2001]
  A)
             A good absorber is a bad emitter done clear
  B)
             Everybody absorbs and emits radiations at every temperature       done clear
  C)
             The energy of radiations emitted from a black body is same for all wavelengths      done clear
  D)
             The law showing the relation of temperatures with the wavelength of maximum emission from an ideal black body is Plank?s law done clear
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• question_answer37)
  A piece of blue glass heated to a high temperature and a piece of red glass at room temperature, are taken inside a dimly lit room then                                                         [KCET 2005]
  A)
             The blue piece will look blue and red will look as usual done clear
  B)
             Red look brighter red and blue look ordinary blue done clear
  C)
             Blue shines like brighter red compared to the red piece done clear
  D)
             Both the pieces will look equally red. done clear
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• question_answer38)
  Which of the following law states that ?good absorbers of heat are good emitters?                                          [Orissa JEE 2005]
  A)
             Stefan?s law                          done clear
  B)
             Kirchoff?s law done clear
  C)
             Planck?s law                           done clear
  D)
             Wein?s law done clear
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