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NEET levelSingle correct optionDifficulty 1 of 3td114

A gas in an insulated cylinder is compressed by a piston, and $500 J$ of work is done on the gas. What is the change in internal energy of the gas?

A $- 500 J$
B $+ 500 J$
C $0$
D $+ 1000 J$

Answer: B

The cylinder is insulated, so the process is adiabatic and

q = 0

. With

w = + 500 J

(work done on the system),

Δ U = q + w = 0 + 500 = + 500 J

.

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