Question

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

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

Answer 1

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

$△E=q+W$

$q=0(\because$ temperature is to increase, no heat should enter or leave the system)

$△E=q+W$ $=0+W$ or $△E=W$

$\therefore W\ne 0,q=0$

Hence, the correct option is $\text{A}$