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Home› UPSC CSE› Prelims GS Paper I› 2013 questions› Question 97

UPSC CSE Prelims

Subject: Physics Chapter: Basic Concepts

2013 PYQ

Question 97

Ball bearings are used in bicycles, cars, etc., because

Choose one answer Athe actual area of contact between the wheel and axle is increased Bthe effective area of contact between the wheel and axle is increased Cthe effective area of contact between the wheel and axle is reduced DNone of the above statements is correct

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Correct answer: C

Correct Option: C Explanation: Ball bearings substitute rolling contact for sliding friction between moving machine parts, lowering resistance and wear. Option-wise Analysis: A: Incorrect - Wrong: increasing sliding-contact area is not why bearings reduce friction. B: Incorrect - Wrong: greater effective contact does not explain their low rolling resistance. C: Correct - Correct in the exam’s simplified account: effective contact is reduced and rolling replaces sliding. D: Incorrect - Wrong: option C best captures the bearing’s friction-reduction role.

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