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Engineering Mechanics

Engineering Mechanics
A screw jack used for lifting the loads is

A reversible machine
A non-reversible machine
An ideal machine
None of these

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Engineering Mechanics
On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be

Upwards at its upper end
Zero at its upper end
Perpendicular to the wall at its upper end
Downwards at its upper end

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Engineering Mechanics
The center of percussion of a solid cylinder of radius ‘r’ resting on a horizontal plane will be

r/A
2r/3
r/2
3r/2

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Engineering Mechanics
If tension in the cable supporting a lift moving downwards is half the tension when it is moving upwards, the acceleration of the lift is

g/2
None of these
g/4
g/3

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Engineering Mechanics
A force while acting on a body may

Change its motion
Give rise to the internal stresses in it
Balance the forces, already acting on it
All of these

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Engineering Mechanics
Coefficient of friction depends upon

Area of contact only
Nature of surface only
Both (A) and (B)
None of these

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