• # question_answer In a closed insulated container, a liquid is stirred with a paddle to increase the temperature, which of the following is true? A) $\Delta E=W\ne 0,\,\,q=0$         B) $\Delta E=W=\,\,q\ne 0$ C) $\Delta E=0,\,W=\,q\ne 0$         D) $W=0,\,\,\Delta \text{E}\,\text{=}\,\,\text{q}\ne \text{0}$

Internal energy depend upon temperature and according to first law of thermodynamics total energy of an isolated system remains same, i.e., in a system of constant mass, energy can neither be created nor destroyed by any physical or chemical change but can be transformed from one form to another. $\Delta E=\,\,q+w$ For closed insulated container, $\operatorname{q}= 0$, so, $\Delta E = +w$, as work is done by the system.