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Q.

Consider the two statements
Statement (A) :   Frictional force can be zero even though the contacting surfaces is rough
Statement (B) :   Even though there is no relative motion between surfaces, friction force may exist between them

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a

Both A and B are false 

b

Both A and B are true

c

A is false but B is true

d

A is true B is false

answer is A.

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Detailed Solution

If there is no tendency of relative motion frictional force will be zero. 
If the applied force is not enough relative motion will be absent, but there will be a frictional force.

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