Ques. 1JEE Main 2025, 22 January (Morning Shift)
A liquid when kept inside a thermally insulated closed vessel at 25 was mechanically stirred from outside. What will be the correct option for the following thermodynamic parameters ?
- U = 0, q < 0, w > 0
- U > 0, q = 0, w > 0
- U = 0, q = 0, w = 0
- U < 0, q = 0, w > 0
Answer
(2) U > 0, q = 0, w > 0
Solution
Insulated vessel q = 0; stirring does work on the liquid w > 0
U = q + w = w > 0
Answer: (2)