STANDARDPhysics-Thermodynamics
STANDARD Physics First Law of Thermodynamics MCQ Question
Type: MCQ-conceptual-Medium-Class 11
Heat is supplied to a diatomic gas at pressure. The ratio of ΔQ : ΔU : W is
A
5 : 3 : 2
B
7 : 5 : 2
C
2 : 3 : 5
D
2 : 5 : 7
Correct Answer
Option B
Detailed Explanation
For a diatomic gas, C_v = 5/2 R, C_p = 7/2 R. ΔQ = nC_pΔT = n(7/2)RΔT, ΔU = nC_vΔT = n(5/2)RΔT, W = ΔQ - ΔU = nRΔT. Therefore, ΔQ : ΔU : W = 7 : 5 : 2.
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