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JAMB Physics 2025 Objective — Question 20

Question 20 of 40 from the Joint Admissions and Matriculation Board (JAMB) Physics 2025 Objective paper, with the correct answer and a full explanation.

According to the first law of thermodynamics, when a system receives heat Q and does work W, the increase in internal energy ΔU equals:

A. Q − WCorrect
B. Q + W
C. W − Q
D. QW

Explanation

First law: ΔU=Q-W.

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