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Sci & Tech - NCERT Summary

Quick practice

Question 1 of 5

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

None of the statements is correct

D

The effective area of contact between the wheel and axle is reduced 

Concepts

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