NEET UG PHYSICS MCQ: THERMODYNAMICS

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In the certain process, 400 cal of heat are supplied to a system and at the same time 105 J of mechanical work was done on the system. The increase in its internal energy is

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Correct option: D

425 cal

Option D (425 cal) is correct because it is the increase in internal energy calculated using the first law of thermodynamics:

\Delta U = Q - W

, where W is negative when work is done on the system.

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