Engineering Thermodynamics
A gas is compressed in a cylinder by a movable piston to a volume one half its original volume. During the process 300 kJ heat left the gas and internal energy remained same. The work done on gas in Nm will be

3000 Nm
300 Nm
30 Nm
300,000 Nm

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Engineering Thermodynamics
According to First law of thermodynamics,

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
Total internal energy of a system during a process remains constant

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