Theory of Machine
Torsional vibrations are said to occur when the particles of a body moves

Parallel to its axis
None of these
In a circle about its axis
Perpendicular to its axis

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Theory of Machine
The steering of a ship means

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

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