RE-NEET 2026 Physics Volume Expansion MCQ Question
The temperature of a metallic sphere of radius R is increased by a small amount ΔT. If the linear coefficient of thermal expansion of the metal is α, the approximate increase in the volume of the sphere is:
3πR³αΔT
4πR³αΔT
6πR³αΔT
2πR³αΔT
Correct Answer
Detailed Explanation
The volume expansion is given by ΔV = 3αVΔT for a sphere, where V = 4/3πR³. Thus, the increase in volume is approximately 6πR³αΔT.
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