Question # 1

Real gases strictly obey gas law at:

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High pressure and low temperatures

Low pressures and high temperatures

High pressures and high temperatures

None of these

In thermodynamics, internal energy is the function of

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temperature

pressure

state

none of them

Which quantity is important in stating the entropy of the system

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initial entropy

final entropy

change in entropy

none of them

Hydrogen and helium of same volume V at same temperature T and same pressure P are mixed to have same volume V. The resulting pressure of the mixtures will be

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R/2

P

2P

Depending on the relative mass of the gases

Efficiency of carnot engine is independent of the

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temperature of sink

temperature of source

nature of the working substances

none of them

Maximum density of H₂O is at the temperature

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32°F

39.2°F

42°F

4°F

The value of E₀in coulomb's law is:

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9 x 10⁹Nm²C^-2

8.85 x 10^-12C²N^-1m^-2

8.85 x 10^-12Nm²C^-2

9 x 10⁹C²N^-1m^-2

Melting point of ice

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Increases with increasing pressure

Decreases with increasing pressure

Is independent of pressure

Is proportional to pressure

The highest efficiency of a heat engine whose low temperature is 17°C and the high temperature is 200°C is

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70%

100%

35%

38%

The process which is carried out at constant temperature is known as

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adiabatic process

isothermal process

isochoric process

none of them

An isochoric process is one which take place at

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Constant internal energy

Constant entropy

Constant volume

Constant pressure

A real gas can be approximated to an ideal gas at

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Low density

High pressure

High density

Low temperature

In the reverse process, the working substance passes through the same stages as in the direct process and

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thermal effects at each stage are exactly reversed

mechanical effects at each stage are exactly reversed

thermal and mechanical effects at each stage remain the same

thermal and mechanical effects at each stage are exactly reversed

The product of the pressure and volume of an ideal gas is

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A constant

Approximately equal to the universal gas constant

Directly proportional to its temperature

Inversely proportional to its temperature

Gas constant per molecule is called:

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Universal gas constant

Stefen's constant

Boltzmann constant

Gravitation constant

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