Directions for: The questions consist of two statements each, printed as assertion and reason. While answering these questions you are required to choose any one of the following five responses A. If both the Assertion and the Reason are true and the Reason is a correct explanation of the Assertion. B. If both the Assertion and the Reason are true but the Reason is not a correct explanation of Assertion. C. If the Assertion is true but the Reason is false. D. If both the Assertion and the Reason are false. E. If Assertion is false but Reason is true.
Assertion : First law of thermodynamics does not forbid flow of heat from lower temperature to higher temperature, Reason: Hear supplied to a system always equal to the increase in its internal energy.A) A
B) B
C) C
D) D
E) E
Correct Answer: B
Solution :
First law of thermodynamics tells only about the conversion of mechanical energy into the heat and vice-versa. It does not put any condition as to why heat cannot flow from lower temperature to highter temperature. First law of thermodynamics given \[dQ=dU+dW\] If heat is supplied as such its volume does not change f.e., dU = 0, then whole of the heat energy supplied to the system will increase in its internal energy only.
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