Theory of Machine
The two elements of a pair are said to form a higher pair, when they

Are kept in contact by the action of external forces, when in motion
Have a line or point contact when in motion
Permit relative motion
Have a surface contact when in motion

ANSWER DOWNLOAD EXAMIANS APP

Theory of Machine
The steering of a ship means

Movement of a complete ship up and down in vertical plane about transverse axis
Turning of a complete ship in a curve towards right or left, while it moves forward
None of these
Rolling of a complete ship sideways

ANSWER DOWNLOAD EXAMIANS APP