CBSE  /  Class 11  /  Physics  /  Kinetic Theory

  • 1. 
    One mole of an ideal gas requires 207 J heat to raise the temperature by 10 K, when heated at constant pressure. If the same gas is heated at constant volume to raise the temperature by 10K, then heat required is

  • 96.6 J
  • 124 J
  • 198.8 J
  • 215.4 J

  • 2. 
    If 2 kcal, of heat is supplied to a system cause to change the internal energy of a gas is 5030 J, and external work done is 3350 J, then what is mechanical equivalent of heat?

  • 41.90 J/kcal
  • 4190 J/cal
  • 4.19 J/kcal
  • 4.19 J/cal

  • 3. 
    For a gas, the r.m.s. speed at 800K is

  • Half the value at 200 K
  • Double the value at 200 K
  • Same as at 200 K
  • Four times the value at 200 K

  • 4. 
    The specific heat of a gas

  • Has only one value
  • Has two values CP and CV
  • Is proportional to the square root of its absolute temperature
  • Can have any value between 0 and infinity

  • 5. 
    Average kinetic energy of molecules is

  • Directly proportional to square root of temperature
  • Directly proportional to absolute temperature
  • Independent of absolute temperature
  • Inversely proportional to absolute temperature

  • 6. 
    The temperature of a gas is -68°C. to what temperature should it be heated, so that the r.m.s. velocity of the molecules be doubled?

  • 357°C
  • 457°C
  • 547°C
  • 820°C

  • 7. 
    Following gases are kept at the same temperature. Which gas possesses maximum r.m.s. speed?

  • Oxygen
  • Nitrogen
  • Hydrogen
  • Carbon dioxide

  • 8. 
    Which of the following is the unit of specific

  • J kg/°c
  • J/kg°c
  • kg°c/J
  • J kg/°c²

  • 9. 
    According to kinetic theory of gases, at absolute zero of temperature

  • Water freezes
  • Liquid helium freezes
  • Molecular motion stops
  • Liquid hydrogen freezes

  • 10. 
    The average kinetic energy of the molecules of a gas at 27°C is 9 10-20 J. what is its average K.E. at 227°C?

  • 5 10-20 J
  • 10 10-20 J
  • 15 10-20 J
  • 20 10-20 J
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