Physics - Thermal Properties of Matter

Question - 1

Heat given to a system can be associated with 

  • A kinetic energy of random motion of molecules
  • B kinetic energy of orderly motion of molecules
  • C total kinetic energy of random and orderly motion of molecules
  • D kinetic energy of random motion in some cases and kinetic energy of orderly motion in other

Question - 2

At what temperature (in o C), the fahrenheit and celsius scale gives same reading? 

  • A 40
  • B -40
  • C 8
  • D -8

Question - 3

A bimetallic strip is made of aluminium and steel \(\left( { \alpha }_{ Al }>{ \alpha }_{ steel } \right) \) on heating, the strip will 

  • A remain straight
  • B get twisted 
  • C get twisted
  • D bend with aluminium on concave side

Question - 4

If a piece of metal is heated to temperature \(\theta \) and then allowed to cool in a room which is at temperature \(\theta _0\), the graph between the temperature T of the metal and time t will be closed to

  • A
  • B
  • C
  • D

Question - 5

The radius of metal sphere at room temperature T is R and the coefficient of linear expansion of the metal is \(\alpha \) . The sphere is heated a little by a temperature T so that, new temperature is \(T+\Delta T.\) The increase in volume of sphere is approximately 

  • A \(2\pi R\alpha \Delta T\)
  • B \(\pi { R }^{ 2 }\alpha \Delta T\)
  • C \(4\pi { R }^{ 3 }\alpha \Delta T/3\)
  • D \(4\pi { R }^{ 3 }\alpha \Delta T\)

Question - 6

Which one of the following would raise the temperature of 40 g of water at 20o C most mixed with? 

  • A 20 g of water at 40o C
  • B 30 g of water at 30o C
  • C 10 g of water at 60o C
  • D 4 g of water at 100o C

Question - 7

A black body is at 2000 K, it emits maximum energy at a wavelength 1\(\mu m\)The temperature, it emits at wavelength of 2\(\mu m\)  is 

  • A 1000 K
  • B 2000 K
  • C 500 K
  • D 100 K

Question - 8

A star emits wavelength 289.8 nm of maximum intensity. Then, radiant intensity of state is \((\sigma =5.67\times { 10 }^{ -8 }W/{ m }^{ 2 }/{ k }^{ 4 },\) Wein's constant, b=2898X10-6 mK)

  • A 5.67X1016 W/m2
  • B 5.67X1014 W/m2
  • C 5.67X1010 W/m2
  • D 5.67X108 W/m2

Question - 9

Wein's displacement law for emission of radiation can be written as 

  • A \({ \lambda }_{ max }\)  is inversely proportional to square of absolute temperature (T2)
  • B \({ \lambda }_{ max }\) is inversely proportional to absolute temperature (T)
  • C \({ \lambda }_{ max }\) is directly proportional to absolute temperature (T)
  • D \({ \lambda }_{ max }\) is inversely proportional to square of absolute temperature (T2 )

Question - 10

If temperature of black body increases from 300 K to 900 K, then the rate of energy radiation increase by 

  • A 81
  • B 3
  • C 9
  • D 2
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