NEET Physics Thermodynamics Questions Solved


Two cylinders A and B fitted with pistons contain equal amounts of an ideal diatomic gas at 300 K. The piston of 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 30 K, then the rise in temperature of the gas in B is 

(1) 30 K

(2) 18 K

(3) 50 K

(4) 42 K

(4) In both cylinders A and B the gases are diatomic (γ = 1.4). Piston A is free to move i.e. it is isobaric process. Piston B is fixed i.e. it is isochoric process. If same amount of heat ΔQ is given to both then

(ΔQ)isobaric=(ΔQ)isochoricμCp(ΔT)A=μCv(ΔT)B

(ΔT)B=CpCv(ΔT)A=γ(ΔT)A=1.4×30=42K.

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