Strength of Materials MCQs with Answers | Strength of Materials Quiz

101 If rain is falling in the opposite direction of the movement of a pedestrain, he has to hold his umbrella

A more inclined when moving

B less inclined when moving

C more inclined when standing

D less inclined when standing

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Answer: less inclined when standing

102 Limiting force of friction is the

A tangent of angle between normal-reaction and the resultant of normal reaction and limiting friction

B ratio of limiting friction and normal reaction

C the friction force acting when the body is just about to move

D the friction force acting when the body is in motion

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Answer: the friction force acting when the body is just about to move

103 Coulomb friction is the friction between

A bodies having relative motion

B two dry surfaces

C two lubricated surfaces

D solids and liquids

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Answer: bodies having relative motion

104 Tangent of angle of friction is equal to

A kinetic friction

B limiting friction

C angle of repose

D coefficient of friction

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Answer: coefficient of friction

105 Kinetic friction is the

A tangent of angle between normal reac-tion and the resultant of normal reac-tion and the limiting friction

B ratio of limiting friction and normal reaction

C the friction force acting when the body is just about to move

D the friction force acting when the body is in motion

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Answer: the friction force acting when the body is in motion

106 A semi-circular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi-cricular disc and horizontal surface is i. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will

A remain horizontal

B slant up towards direction of pull

C slant down towards direction of pull

D None of the above

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