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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a
If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
b
If both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.
c
If Assertion is true but Reason is false.
d
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.