Question

In a closed insulated container, a liquid is stirred with a paddle to increase its temperature. In this process, which of the following is TRUE?

Options

• ∆U = W = Q = 0

• ∆U ≠ 0, Q = W = 0

• ∆U = W ≠ 0, Q = 0

• ∆U = Q ≠ 0, W = 0

Answer 1

∆U = W ≠ 0, Q = 0

Explanation:

As the system is closed and insulated, no heat can enter or leave the system, i.e. Q = 0;

∴ ∆U = Q + W = 0 + W