NEET2026Physics-Thermodynamics
NEET 2026 Physics First Law of Thermodynamics MCQ Question
Type: MCQ-conceptual-Medium-Class 11
An electric heater supplies heat to a system at a rate of 100 W. If the system performs work at a rate of 75 J/s, then the rate at which internal energy increases will be:
A
75 W
B
100 W
C
125 W
D
25 W
Correct Answer
Option D
Detailed Explanation
Using the law of thermodynamics for an electric heater, Q = ΔU + W. Given dQ/dt = 100 W and dW/dt = 75 W, we find d(ΔU)/dt = 25 W.
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