Question

In a closed insulated container, a liquid is stirred with a paddle to increase the temperature, which of the following is true?

• A. $\Delta E=\Delta W\ne 0,q=0$
• B. $\Delta E=W=0,q\ne 0$
• C. $\Delta E=0,W=q\ne 0$
• D. $W=0,\Delta E=q\ne 0$

Answer 1

The correct option is A $\Delta E=\Delta W\ne 0,q=0$

In closed insulated container a liquid is stirred with a paddle to increase the temperature, therefore, it behaves as an adiabatic process, $q=0$.

Hence, from the first law of thermodynamics:

$\Delta E=q+W;$ $\because q=0$

$\Delta E=W$ but not equal to zero.

Hence, the correct answer is option $\text{B}$.