Chemistry-First Law
NEET Chemistry First Law MCQ Question
Type: MCQ-numerical-Easy-Class 11
Calculate the change in internal energy (ΔU) for a system where 50 J of heat is added and 30 J of work is done by the system.
A
ΔU = 80 J
B
ΔU = 20 J
C
ΔU = -20 J
D
ΔU = -80 J
Correct Answer
Option B
Detailed Explanation
According to the first law of thermodynamics, ΔU = q + w. Here, q = 50 J and w = -30 J (since work is done by the system), so ΔU = 50 J - 30 J = 20 J.
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