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Q.

In free expansion process.
a) Work is done on the system
b) work is done by the system
c) work done is zero.

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a

c only

b

a only

c

b (or) c

d

b only

answer is C.

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Detailed Solution

$Δ Q = 0 in free expansion$

$Δ U = 0$ in free expansion
From 1st law of thermodynamics

$\begin{array}{l} Δ Q = Δ U + Δ W \\ 0 = 0 + Δ W \\ Δ W = 0 \end{array}$

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