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Pulley and Wheels

Pick Odd one ...

Question

Pick Odd one out -
Lubricant, wheel, ball bearings, grooved tyres, streamlined shape

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Solution

Explanation:
Lubricant, ball bearings, wheel(circular shape) and streamlined shape are use to reduce friction.
Whereas,grooved tyres (roughness is increased) are used to increase friction.
Hence, the correct answer is Grooved Tyres.

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