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NEET levelSingle correct optionDifficulty 1 of 3td169

A fixed amount of ideal gas in a rigid closed vessel absorbs $500 J$ of heat. Which statement is correct?

A $Δ U = 0$ and $w = + 500 J$
B $Δ U = + 500 J$ and $w = 0$
C $Δ U = + 500 J$ and $w = - 500 J$
D $Δ U = 0$ and $w = - 500 J$

Answer: B

The volume is fixed, so

P Δ V = 0

and

w = 0

. Then

Δ U = q + w = + 500 J

; all the heat raises the internal energy.

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