CBSE  /  Class 11  /  Physics  /  Thermodynamics

  • 1. 
    The translational kinetic energy of gas molecules at temperature T for one mole of a gas is

  • (3/2) RT
  • (9/2) RT
  • (1/3) RT
  • (5/2) RT

  • 2. 
    Which of the following parameters dose not characterize the thermodynamic state of matter?

  • work
  • volume
  • pressure
  • Temperature

  • 3. 
    The temperatures of inside and outside of a refrigerator are 273 K and 303 K respectively. Assuming, that the refrigerator cycle is reversible, for every joule of work done, the heat delivered to the surrounding will be nearly:

  • 10 J
  • 20 J
  • 30 J
  • 50 J

  • 4. 
    A Carnot engine whose sink is at 300 K has an efficiency of 40%. By how much should the temperature of source be increased, so as to increase its efficiency by 50% of original efficiency?

  • 275 K
  • 325 K
  • 250 K
  • 380 K

  • 5. 
    For a diatomic gas change in internal energy for a unit change in temperature for constant pressure and constant volume is U1 and U2 respectively. What is the ratio of U1 and U2?

  • 5 : 3
  • 3 : 5
  • 1 : 1
  • 5 : 7

  • 6. 
    Which of the following parameters dose not characterize the thermodynamic state of matter?

  • work
  • volume
  • pressure
  • Temperature

  • 7. 
    The translational kinetic energy of gas molecules at temperature T for one mole of a gas is

  • (3/2) RT
  • (9/2) RT
  • (1/3) RT
  • (5/2) RT

  • 8. 
    Heat cannot by itself flow from a body at lower temperature to a body at higher temperature is a statement as a conseqence of

  • conservation of mass
  • conservation of momentum
  • first law of thermodynamics
  • second law of thermodynamics

  • 9. 
    Which of the following statements is correct for any thermodynamic system?

  • The internal energy changes in all processes.
  • Internal energy and entropy are state functions.
  • The change in entropy can never be zero.
  • The work done in an adiabatic process is always zero.

  • 10. 
    During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its absolute temperature. The ratio Cp/Cv for the gas is

  • 2
  • 3/2
  • 4/3
  • 5/3
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