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Q.
A quantity of air $(\gamma=1.4)$ at $27^{\circ} C$ is compressed suddenly, the temperature of the air system will
AMUAMU 2002
Solution:
From first law of thermodynamics
$\Delta U=Q-W$
where $\Delta U$ is change in internal energy, $W$ the work and $Q$ the energy.
When air is compressed, it means work is done on the system, so internal energy increases, it means temperature increases.