Directions: These questions consists of two statements each printed as Assertion and Reason. While answering these questions you are required to choose any one of the following four responses Assertion : A body of mass 10 kg is placed on a rough inclined surface ( μ = 0.7). The surface is inclined to horizontal at angle 30°. Acceleration of the body down the plane will be zero.Reason : Force of friction is zero.

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If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.

If both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.

If Assertion is true but Reason is false.

If Assertion is false but Reason is true.

answer is C.

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Detailed Solution

mgsinθ=10×10×12=50 Nffriction =μmgcosθ=0.7×10×10×32=60.62 NSince, μmgcosθ is more, block will remain stationary.

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