Theory of Machine
The angle of inclination of the plane, at which the body begins to move down the plane is called

Angle of projection
None of these
Angle of friction
Angle of repose

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Theory of Machine
Kinematic pairs are those which have

Point or line contact between the two elements when in motion
Surface contact between the two elements when in motion
Elements of pairs not held together mechanically
Two elements that permit relative motion

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