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
Angle of repose
None of these
Angle of friction

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Theory of Machine
A body is said to be under forced vibrations, when

None of these
There is a reduction in amplitude after every cycle of vibration
A body vibrates under the influence of external force
No external force acts on a body, after giving it an initial displacement

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Theory of Machine
The relation l = (2/3).(j + 2) apply only to kinematic chains in which lower pairs are used. This may be used to kinematic chains in which higher pairs are used, but each higher pair may be taken as equivalent to

Any one of these
Two lower pairs and two additional links
Two lower pairs and one additional link
One lower pair and two additional links

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