JEE Main & Advanced Physics Transmission of Heat Question Bank

done Topic Test - Transmission of Heat (3-5-21) Total Questions - 40

• question_answer1)
  The length of the two rods made up of the same metal and having the same area of cross-section are 0.6 m and 0.8 m respectively. The temperature between the ends of first rod is \[{{90}^{o}}C\] and \[{{60}^{o}}C\]and that for the other rod is 150 and \[{{110}^{o}}C\]. For which rod the rate of conduction will be greater
  A)
  First done clear
  B)
  Second done clear
  C)
  Same for both done clear
  D)
  None of the above done clear
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• question_answer2)
  The dimensions of thermal resistance are
  A)
  \[{{M}^{-1}}{{L}^{-2}}{{T}^{3}}K\] done clear
  B)
  \[M{{L}^{2}}{{T}^{-2}}{{K}^{-1}}\] done clear
  C)
  \[M{{L}^{2}}{{T}^{-3}}K\] done clear
  D)
  \[M{{L}^{2}}{{T}^{-2}}{{K}^{-2}}\] done clear
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• question_answer3)
  The quantity of heat which crosses unit area of a metal plate during conduction depends upon
  A)
  The density of the metal done clear
  B)
  The temperature gradient perpendicular to the area done clear
  C)
  The temperature to which the metal is heated done clear
  D)
  The area of the metal plate done clear
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• question_answer4)
  In order that the heat flows from one part of a solid to another part, what is required
  A)
  Uniform density  done clear
  B)
  Density gradient done clear
  C)
  Temperature gradient       done clear
  D)
  Uniform temperature done clear
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• question_answer5)
  Two rods having thermal conductivity in the ratio of 5 : 3 having equal lengths and equal cross-sectional area are joined by face to face. If the temperature of the free end of the first rod is \[100{}^\circ C\] and free end of the second rod is \[{{20}^{o}}C\]. Then temperature of the junction is
  A)
  \[70{}^\circ C\] done clear
  B)
  \[50{}^\circ C\] done clear
  C)
  \[50{}^\circ C\] done clear
  D)
  \[90{}^\circ C\] done clear
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• question_answer6)
  A wall has two layers A and B made of different materials. The thickness of both the layers is the same. The thermal conductivity of A and B are \[{{K}_{A}}\] and \[{{K}_{B}}\] such that \[{{K}_{A}}=3{{K}_{B}}\]. The temperature across the wall is \[20{}^\circ C\]. In thermal equilibrium
  A)
  The temperature difference across \[A=15{}^\circ C\] done clear
  B)
  The temperature difference across \[A=5{}^\circ C\] done clear
  C)
  The temperature difference across A is \[10{}^\circ C\] done clear
  D)
  The rate of transfer of heat through A is more than that through B. done clear
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• question_answer7)
  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_answer8)
  The rate of loss of heat from a body cooling under conditions of forced convection is proportional  to its [A] heat capacity [B] surface area [C] absolute temperature [D] excess of temperature over that of surrounding : state if
  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_answer9)
  Which of the following is the correct device for the detection of thermal radiation        
  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_answer10)
  Good absorbers of heat are                     
  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_answer11)
  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
  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_answer12)
  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     
  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_answer13)
  The wavelength of maximum emitted energy of a body at 700 K is 4.08 \[\mu m\]. If the temperature of the body is raised to 1400 K, the wavelength of maximum emitted energy will be            
  A)
  \[1.02\ \mu m\] done clear
  B)
  16.32\[\mu m\] done clear
  C)
  8.16\[\mu m\] done clear
  D)
  2.04\[\mu m\] done clear
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• question_answer14)
  On increasing the temperature of a substance gradually, which of the following colours will be noticed by you
  A)
  White done clear
  B)
  Yellow  done clear
  C)
  Green done clear
  D)
  Red       done clear
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• question_answer15)
  The radiation energy density per unit wavelength at a temperature T has a maximum at a wavelength \[{{\lambda }_{0}}\]. At temperature \[2T\], it will have a maximum at a wavelength
  A)
  4\[{{\lambda }_{0}}\] done clear
  B)
  2\[{{\lambda }_{0}}\] done clear
  C)
  \[{{\lambda }_{0}}\]/2 done clear
  D)
  \[{{\lambda }_{0}}\]/4 done clear
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• question_answer16)
  A metal ball of surface area \[200\ c{{m}^{2}}\] and temperature \[{{527}^{o}}C\] is surrounded by a vessel at \[{{27}^{o}}C\]. If the emissivity of the metal is 0.4, then the rate of loss of heat from the ball is \[(\sigma =5.67\times {{10}^{-8}}J/{{m}^{2}}\ -s-{{k}^{4}})\]                 
  A)
  108 joules approx. done clear
  B)
  168 joules approx. done clear
  C)
  182 joules approx. done clear
  D)
  192 joules approx. done clear
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• question_answer17)
  The temperatures of two bodies A and B are \[{{727}^{o}}C\] and \[{{127}^{o}}C\]. The ratio of rate of emission of radiations will be
  A)
  727/127 done clear
  B)
  625/16 done clear
  C)
  1000/400 done clear
  D)
  100/16 done clear
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• question_answer18)
  If the temperature of the sun (black body) is doubled, the rate of energy received on earth will be increased by a factor of            
  A)
  2 done clear
  B)
  4 done clear
  C)
  8 done clear
  D)
  16 done clear
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• question_answer19)
  Two spheres made of same material have radii in the ratio 1: 2 Both are at same temperature. Ratio of heat radiation energy emitted per second by them is
  A)
  1 : 2 done clear
  B)
  1 : 8 done clear
  C)
  1 : 4 done clear
  D)
  1 : 16 done clear
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• question_answer20)
  A black body radiates energy at the rate of \[1\times {{10}^{5}}J/s\times {{m}^{2}}\] at temperature of \[227{}^\circ C\]. The temperature to which it must be heated so that it radiates energy at rate of \[1\times {{10}^{9}}J\text{/}s{{m}^{2}}\], is         
  A)
  5000 K done clear
  B)
  5000\[{}^\circ C\] done clear
  C)
  500 K done clear
  D)
  500\[{}^\circ C\] done clear
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• question_answer21)
  The ratio of radiant energies radiated per unit surface area by two bodies is 16 : 1, the temperature of hotter body is 1000K, then the temperature of colder body will be
  A)
  250 K done clear
  B)
  500 K done clear
  C)
  1000 K done clear
  D)
  62.5 K done clear
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• question_answer22)
  In Newton's experiment of cooling, the water equivalent of two similar calorimeters is 10 gm each. They are filled with 350 gm of water and 300 gm of a liquid (equal volumes) separately. The time taken by water and liquid to cool from \[{{70}^{o}}C\] to \[{{60}^{o}}C\] is 3 min and 95 sec respectively. The specific heat of the liquid will be
  A)
  \[0.3\,Cal\text{/}gm\times {}^\circ C\] done clear
  B)
  \[0.6\,Cal\text{/}gm\times {}^\circ C\] done clear
  C)
  \[0.6\,Cal\text{/}gm\times {}^\circ C\] done clear
  D)
  \[0.8\,Cal\text{/}gm\times {}^\circ C\] done clear
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• question_answer23)
  A container contains hot water at \[{{100}^{o}}C\]. If in time \[{{T}_{1}}\] temperature falls to \[{{80}^{o}}C\] and in time \[{{T}_{2}}\] temperature falls to \[{{60}^{o}}C\] from \[{{80}^{o}}C\], then
  A)
  \[{{T}_{1}}={{T}_{2}}\] done clear
  B)
  \[{{T}_{1}}>{{T}_{2}}\] done clear
  C)
  \[{{T}_{1}}<{{T}_{2}}\] done clear
  D)
  None done clear
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• question_answer24)
  A body takes 5 minute to cool from \[80{}^\circ C\] to \[50{}^\circ C\]. How much time it will take to cool from \[60{}^\circ C\] to \[30{}^\circ C\], if room temperature is \[20{}^\circ C\].
  A)
  40 minute done clear
  B)
  9 minute done clear
  C)
  30 minute done clear
  D)
  20 minute done clear
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• question_answer25)
  Two rods A and B are of equal lengths. Their ends are kept between the same temperature and their area of cross-sections are \[{{A}_{1}}\]and \[{{A}_{2}}\]and thermal conductivities \[{{K}_{1}}\] and \[{{K}_{2}}\]. The rate of heat transmission in the two rods will be equal, if
  A)
  \[{{K}_{1}}{{A}_{2}}={{K}_{2}}{{A}_{1}}\] done clear
  B)
  \[{{K}_{1}}{{A}_{1}}={{K}_{2}}{{A}_{2}}\] done clear
  C)
  \[{{K}_{1}}={{K}_{2}}\] done clear
  D)
  \[{{K}_{1}}A_{1}^{2}={{K}_{2}}A_{2}^{2}\] done clear
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• question_answer26)
  Two identical plates of different metals are joined  to form a single plate whose thickness is double the thickness of each plate. If the coefficients of conductivity of each plate are 2 and 3 respectively, then the conductivity of composite plate will be
  A)
  5 done clear
  B)
  2.4 done clear
  C)
  1.5 done clear
  D)
  1.2 done clear
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• question_answer27)
  Two bars of thermal conductivities K and 3K and lengths \[1cm\] and \[2cm\] respectively have equal cross-sectional area, they are joined lengths wise as shown in the figure. If the temperature at the ends of this composite bar is \[{{0}^{o}}C\] and \[{{K}^{2}}/l\] respectively (see figure), then the temperature \[\varphi \]of the interface is
  A)
  \[{{50}^{o}}C\] done clear
  B)
  \[\frac{100}{3}{{\ }^{o}}C\] done clear
  C)
  \[{{60}^{o}}C\] done clear
  D)
  \[\frac{200}{3}{{\ }^{o}}C\] done clear
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• question_answer28)
  The lengths and radii of two rods made of same material are in the ratios 1 : 2 and 2 : 3 respectively. If the temperature difference between the ends for the two rods be the same, then in the steady state, the amount of heat flowing per second through them will be in the ratio    
  A)
  1: 3 done clear
  B)
  4 : 3 done clear
  C)
  8 : 9 done clear
  D)
  3 : 2 done clear
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• question_answer29)
  Which of the following circular rods. (given radius r and length l) each made of the same material as whose ends are maintained at the same temperature will conduct most heat
  A)
  \[r=2{{r}_{0}};\ l=2{{l}_{0}}\] done clear
  B)
  \[r=2{{r}_{0}};\ l={{l}_{0}}\] done clear
  C)
  \[r={{r}_{0}};\ l={{l}_{0}}\] done clear
  D)
  \[r={{r}_{0}};\ l=2{{l}_{0}}\] done clear
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• question_answer30)
  Mode of transmission of heat, in which heat is carried by the moving particles, is        
  A)
  Radiation done clear
  B)
  Conduction done clear
  C)
  Convection done clear
  D)
  Wave motion done clear
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• question_answer31)
  In which of the following process, convection does not take place primarily                
  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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• question_answer32)
  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
  A)
  Radiation done clear
  B)
  Convection done clear
  C)
  Conduction done clear
  D)
  Temperature remains unchanged done clear
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• question_answer33)
  A hot body will radiate heat most rapidly if its surface is
  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_answer34)
  If the temperature of the sun becomes twice its present temperature, then      
  A)
  Radiated energy would be predominantly in infrared done clear
  B)
  Radiated energy would be predominantly in ultraviolet done clear
  C)
  Radiated energy would be predominantly in X-ray region done clear
  D)
  Radiated energy would become twice the present radiated energy done clear
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• question_answer35)
  The maximum wavelength of radiations emitted at 900 K is \[4\mu m\]. What will be the maximum wavelength of radiations emitted at 1200 K
  A)
  \[3\mu m\] done clear
  B)
  \[0.3\mu m\] done clear
  C)
  \[1\mu m\] done clear
  D)
  \[1\,\,m\] done clear
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• question_answer36)
  A black body radiates energy at the rate of \[E\] \[W\text{/}{{m}^{2}}\] at a high temperature TK. When the temperature is reduced to \[\frac{T}{2}K\], the radiant energy will be
  A)
  \[\frac{E}{16}\] done clear
  B)
  \[\frac{E}{4}\] done clear
  C)
  \[4E\] done clear
  D)
  \[16E\] done clear
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• question_answer37)
  The radiant energy from the sun incident normally at the surface of earth is \[20\ kcal/{{m}^{2}}min\]What would have been the radiant energy incident normally on the earth, if the sun had a temperature twice of the present one
  A)
  \[160\ kcal/{{m}^{2}}\ min\] done clear
  B)
  \[40\ kcal/{{m}^{2}}\ min\] done clear
  C)
  \[320\ kcal/{{m}^{2}}\ min\] done clear
  D)
  \[80\ kcal/{{m}^{2}}\ min\] done clear
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• question_answer38)
  Two black metallic spheres of radius 4m, at 2000 K  and 1m at 4000 K  will have ratio of energy radiation as
  A)
  1 : 1 done clear
  B)
  4 : 1 done clear
  C)
  1 : 4 done clear
  D)
  2 : 1 done clear
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• question_answer39)
  Two spheres of same material have radius 1m and 4 m and temperature 4000K and 2000K respectively. The energy radiated per second by the first sphere is
  A)
  Greater than that by the second done clear
  B)
  Less than that by the second done clear
  C)
  Equal in both cases done clear
  D)
  The information is incomplete done clear
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• question_answer40)
  A black body of surface area \[10\,c{{m}^{2}}\] is heated to \[127{}^\circ C\] and is suspended in a room at temperature \[27{}^\circ C\]. The initial rate of loss of heat from the body at the room temperature will be            
  A)
  2.99 W done clear
  B)
  1.89 W done clear
  C)
  1.18 W done clear
  D)
   0.99 W done clear
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