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

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Q: 63 (IAS/2013)
Ball bearings are used in bicycles, cars, etc., because
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question_subject: 

Science

question_exam: 

IAS

stats: 

0,67,46,10,29,67,7

keywords: 

{'ball bearings': [0, 0, 0, 1], 'effective area': [0, 0, 0, 1], 'wheel': [0, 0, 0, 1], 'axle': [0, 0, 0, 1], 'bicycles': [0, 0, 0, 1]}