question_answer

Assertion             :       Work done by a gas in isothermal  expansion is more than the work done by the gas in the same expansion, adiabatically. Reason                 :       Temperature remains constant in isothermal expansion and not in adiabatic expansion.

A)             If both assertion and reason are true and the reason is the correct explanation of the assertion.

B)             If both assertion and reason are true but reason is not the correct explanation of the assertion.

C)             If assertion is true but reason is false.

D)             If the assertion and reason both are false.

E)             If assertion is false but reason is true.

Correct Answer: B

Solution :

           As we know, in thermodynamic processes work done = Area covered by P-V diagram with volume axis.  Hence, according to following graph.       (Area)1 < (Area)2 Þ Wadi < Wiso Also in isothermal changes temperature remains same but in adiabatic changes temperature also changes.