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Q.

 We put engine oil in cars to:

Which among the following options can complete the sentence.

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a

Increase friction

b

Show off 

c

Decrease friction

d

Clean the car

answer is C.

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Detailed Solution

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Car engines require fast movement and hence less friction is needed. 

When we put engine oil in the engine, a layer of oil gets deposited on the moving parts of the engine. Due to this, the irregular surfaces of the moving parts do not come in contact directly and hence the friction is reduced.


 

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