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Q. Ball bearings are used in bicycles, cars, etc., because
  • (A) The effective area of contact between the wheel and axle is increased
  • (B) The actual 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 these
✅ Correct Answer: (C) The effective area of contact between the wheel and axle is reduced

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Ram Sharma
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