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A liquid when kept inside a thermally insulated closed vessel at 25°C was mechanically stirred from outside. What will be the correct option for the following thermodynamic parameters ?

1. Δ U > 0, q = 0, w > 0
2. Δ U = 0, q = 0, w = 0
3. Δ U < 0, q = 0, w > 0
4. Δ U = 0, q < 0, w > 0

Correct answer: Δ U > 0, q = 0, w > 0

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