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Engineering Mechanics

Engineering Mechanics
The velocity of a body on reaching the ground from a height h, is

√(2gh)
√(gh)
2.√(gh)
2g.√h

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Engineering Mechanics
If a body is acted upon by a number of coplanar non-concurrent forces, it may

All of these
Move in any one direction rotating about itself
Rotate about itself without moving
Be completely at rest

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Engineering Mechanics
The unit of angular velocity is

Both (B) and (C)
m/min
rad/s
Revolutions/min

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Engineering Mechanics
If a given force (or a given system of forces) acting on a body __________ the position of the body, but keeps it in equilibrium, then its effect is to produce internal stress in the body.

None of these
Changes periodically
Does not change
Change

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Engineering Mechanics
A spherical body is symmetrical about its perpendicular axis. According to Routh's rule, the moment of inertia of a body about an axis passing through its centre of gravity is (where, M = Mass of the body, and S = Sum of the squares of the two semi-axes.)

None of these
MS/5
MS/3
MS/4

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Engineering Mechanics
Efficiency of a screw jack is given by (where α = Helix angle, and φ = Angle of friction.)

tan(α + φ)/tanα
tan(α - φ)/tanα
None of these
tanα/tan (α + φ)

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