Engineering Thermodynamics
The condition of perfect vacuum, i.e., absolute zero pressure can be attained at

A negative pressure and 0°C temperature
A temperature of - 273.16°C
A temperature of 0°C
A temperature of 273 °K

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Engineering Thermodynamics
According to First law of thermodynamics,

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

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Engineering Thermodynamics
Gases have

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

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Engineering Thermodynamics
The condition for the reversibility of a cycle is

The working parts of the engine must be friction free
All of these
The pressure and temperature of the working substance must not differ, appreciably, from those of the surroundings at any stage in the process
All the processes, taking place in the cycle of operation, must be extremely slow

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