Theory of Machine
The acceleration of a particle at any instant has two components i.e. radial component and tangential component. These two components will be

Perpendicular to each other
Opposite to each other
Inclined at 45°
Parallel to each other

ANSWER DOWNLOAD EXAMIANS APP

Theory of Machine
Lower pairs are those which have

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

ANSWER DOWNLOAD EXAMIANS APP