STANDARDPhysics-Thermodynamics
STANDARD Physics First Law of Thermodynamics MCQ Question
Type: MCQ-numerical-Medium-Class 11
A sample of ideal gas (γ = 1.4) is heated at constant pressure. If 100 J of heat is supplied to the gas the work done by the gas is
A
28.57 J
B
56.54 J
C
38.92 J
D
65.38 J
Correct Answer
Option A
Detailed Explanation
The work done by the gas is calculated using the formula dW = dQ - dU = n(Cₚ - Cᵥ)dT. Given γ = Cₚ/Cᵥ = 1.4, we find dW = 100 × (2/7) = 28.57 J.
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