Engineering Thermodynamics
Gases have

No value of specific heat
Under some conditions one value and sometimes two values of specific heat
Two values of specific heat
Only one value of specific heat

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Engineering Thermodynamics
First law of thermodynamics

Enables to determine change in internal energy of the system
Provides relationship between heat, work and internal energy
Does not enable to determine change in entropy
All of these

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Engineering Thermodynamics
An isolated system is one in which

Mass crosses the boundary but not the energy
Both energy and mass cross the boundaries of the system
Mass does not cross boundaries of the system, though energy may do so
Neither mass nor energy crosses the boundaries of the system

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