Ball bearings are used in bicycles, cars, etc., because
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
Answer & Solution
Correct answer: B. the effective area of contact between the wheel and axle is increased
UPSC CSE Prelims 2013 (GS-I, Set A), Q.88. Official answer key: B.
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