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

Answer: (A)

$\Delta E=\Delta W\ne 0,\,\,q=0$

Answer 2

In closed insulated container a liquid is stirred with a paddle to increase the temperature, therefore, it behaves as adiabatic process, so, for it $q=0$ Hence, from first law of thermodynamics $\Delta E=q +W \text { If } q=0$ Then $\Delta E=W$