NEET2025Physics-First Law of Thermodynamics
NEET 2025 Physics First Law of Thermodynamics MCQ Question
Type: MCQ-conceptual-Medium-Class 11
Two gases A and B are filled at the same pressure in separate cylinders with movable pistons of radius rₐ and rᵦ, respectively. On supplying an equal amount of heat to both the systems reversibly under constant pressure, the pistons of gas A and B are displaced by 16 cm and 9 cm, respectively. If the change in their internal energy is the same, then the ratio rₐ/rᵦ is equal to
A
4/3
B
3/4
C
2/√3
D
√3/2
Correct Answer
Option B
Detailed Explanation
Using the relation for work done W = PΔV and the fact that ΔU is the same, the ratio of radii can be found using the displacement and pressure relation.
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