Engineering Thermodynamics
The variables which control the physical properties of a perfect gas are

Volume occupied by the gas
Temperature of the gas
All of these
Pressure exerted by the gas

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Engineering Thermodynamics
According to Avogadro's law, for a given pressure and temperature, each molecule of a gas

Occupies volume inversely proportional to its specific weight
Occupies volume proportional to its specific weight
Occupies volume inversely proportional to its molecular weight
Occupies same volume

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Engineering Thermodynamics
The specific heat at constant volume is

The amount of heat required to raise the temperature of unit mass of gas through one degree, at constant volume
Any one of the above
The amount of heat required to raise the temperature of unit mass of gas through one degree, at constant pressure
The amount of heat required to raise the temperature of 1 kg of water through one degree

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