Mini Quiz on Thermodynamics....

1.

An electric heater supplies heat to a system at a rate of 100W. If system performs work at a rate of 75 joules per second.Then the rate at which the internal energy increasing is

50W

25W

75W

12.5W

2.

Two Samples of Gas initially at the same temperature and pressure are compressed to half their original volume one isothermally and the other adiabatically, the final pressure will be

greater for adiabatic compression

less for adiabatic compression

same for both cases

none of these

3.

One of the Most efficient Engines ever Developed operates between 2100K and 700K.its actual efficiency is 40%. This is n% of its maximum possible efficiency where n is

40

60

66.37

33.37

4.

One mole of an ideal monoatomic gas heated at a constant pressure of one atom from 0 degreeC to 100 degree C. The change in internal energy is

8.3 * 102J

8.5 * 102J

20.8* 102J

12.48* 102J

5.

The slopes of isothermal and adiabatic curves are relate d as

isothermal curve slope = adiabatic curve slope

isothermal curve slope =gamma* adiabatic curve slope

adiabatic curve slope = Gamma*isothermal curve slope

adiabatic curve slope = 1/2*isothermal curve slope

6.

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

2

5/3

3/2

4/3

7.

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