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Engineering Mechanics

Engineering Mechanics
The unit of force in S.I. system of units is

Kilogram
Watt
Newton
Dyne

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Engineering Mechanics
Work done is said to be zero, when

None of these
Either (A) or (B)
Some force acts on a body, but displacement is zero
No force acts on a body but some displacement takes place

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Engineering Mechanics
The time of flight of a projectile on downward inclined plane depends upon

Angle of inclination of the plane
Angle of projection
None of these
Both (A) and (B)

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Engineering Mechanics
If ‘P’ is the force acting on the body, ‘m’ is the mass of the body and ‘a’ is the acceleration of the body, then according to Newton's second law of motion,

P × m.a = 0
P + m.a = 0
P - m.a = 0
P/m.a = 0

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Engineering Mechanics
A smooth cylinder lying on its convex surface remains in __________ equilibrium.

Neutral
Unstable
None of these
Stable

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Engineering Mechanics
The center of gravity of a semi-circle lies at a distance of __________ from its base measured along the vertical radius.

3r/4π
8r/3
4r/ 3π
3r/ 8

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