| A: First law of thermodynamics specifies the conditions under which a body can use its heat energy to produce the work. |
| B: Second law of thermodynamics states that heat always flows from hot body to cold body the itself. |
A) Both A and B are true
B) both A and B are false
C) A is true but B is false
D) A is false B is true
Correct Answer: A
Solution :
According to first law of thermodynamics. Amount of heat energy Q taken or given to a thermodynamic system is equal to the sum of work done by or on the system W and change in its internal energy \[\text{ }\!\!\Delta\!\!\text{ U}\text{.}\] \[\text{Q = W + }\!\!\Delta\!\!\text{ U}\] Second law of thermodynamics stats that heat cannot be made to flow from cold body to a hot body without any external aid of machine but heat can flow from a hot body to a cold body by itself.
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