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Physics Thermodynamics Mix MCQ (Single Correct)

Two insulting cylinders A and B fitted with pistons contain equal amounts of an ideal diatomic gas at temperature 300K. The piston A is free to move, while that of B is held fixed. The same amount of heat is given to the gas in each cylinder. If the rise in temperature of the gas in A is 30K. Then the rise in temperature of the gas in B is.

A
30K
B
18K
C
50K
D
42K

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Verified by Experts
The correct answer is:
D

A is free to move; therefore, heat will be supplied at constant pressure.

B is held fixed, therefore, heat will be supplied at constant volume.

But

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