JEE Main 2015 Physics question

PhysicsThermodynamicsJEE Main 2015

A solid body of constant heat capacity 1 J is being heated by keeping it in contact with reservoirs in two ways: (i) Sequentially keeping in contact with 2 reservoirs such that each reservoir supplies the same amount of heat. (ii) Sequentially keeping in contact with 8 reservoirs such that each reservoir supplies the same amount of heat. In both, cases the body is brought from initial temperature 100 K to final temperature 200 K. Entropy change of the body in the two cases respectively is: Note: This question was awarded as a bonus since temperatures were given in centigrade instead of in Kelvin. Proper corrections are made in the question to avoid it.

Answer: (3)

Solution

Entropy is a state function, so the entropy change of the body depends only on its initial and final temperatures, not on how many reservoirs were used: $Δ S =

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Question ID VK-115144