Theory of Machine
The steering of a ship means

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
Movement of a complete ship up and down in vertical plane about transverse axis

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Theory of Machine
Lower pairs are those which have

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

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