Engineering Thermodynamics
Gases have

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

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Engineering Thermodynamics
According to Kelvin-Planck’s statement of second law of thermodynamics,

It is possible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
It is impossible to construct a device which operates in a cyclic process and produces no effect other than the transfer of heat from a cold body to a hot body
None of these

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Engineering Thermodynamics
According to First law of thermodynamics,

Total internal energy of a system during a process remains constant
Total energy of a system remains constant
Work-done by a system is equal to the heat transferred by the system
Internal energy, enthalpy and entropy during a process remain constant

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