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UPSC 2013: Ball bearings are used in bicycles, cars, etc., because
(a)the actual area of contact between the wheel and axle is increased
(b)the effective area of contact between the wheel and axle is increased
(c)the effective area of contact between the wheel and axle is reduced
(d)None of the above statements is correct
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Not attemptedCorrect Answer: (c) the effective area of contact between the wheel and axle is reduced
Ball bearings place hard steel balls between the wheel and axle so that the members roll over one another; rolling friction involves only small point contacts whose area is far smaller than the sliding contact in a plain bearing. The drastic reduction in the effective area of contact lowers frictional resistance, which is why option (c) is correct. ([britannica.com](https://www.britannica.com/science/rolling-friction?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 2013 Science & Technology question?▼
The correct answer is option (c): the effective area of contact between the wheel and axle is reduced. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Physics question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2013, GS Paper 1, as Question 88. It falls under Science & Technology > Physics.
What is the difficulty level of this UPSC question?▼
This question is rated "easy". It tests basic recall and most well-prepared aspirants should answer it correctly.
How many UPSC Prelims questions have been asked from Physics?▼
UPSC has asked 104 questions from Physics (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.