Question

Assertion : It is not possible for a system, unaided by an external agency to transfer heat from a body at lower temperature to another body at a higher temperature.

Reason : It is not possible to violate the second low of thermodynamics.

(a) Both A and R are true and R is the correct explanation of A

(b) Both A and R are true but R is not correct explanation of A

(c) A is true but R is false

(d) A and R are false

Answer 1

Correct option (a) Both A and R are true and R is the correct explanation of A

Explanation :

Second law of thermodynamics can be explained with the help of example of refrigerator as we know that in refrigerator, the working substance extracts heat from colder body and rejects a large amount of heat to a hotter body with the help of an external agency i.e.,the electric supply of the refrigerator. No refrigerator can ever work without external supply of electric energy to it.