Theory of Machine
Lower pairs are those which have

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

ANSWER DOWNLOAD EXAMIANS APP

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

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

ANSWER DOWNLOAD EXAMIANS APP