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Engineering Mechanics

Engineering Mechanics
The moment of inertia of a thin rod of mass 'm' and length 'l', about an axis through its centre of gravity and perpendicular to its length is

ml2/12
ml2/8
ml2/ 6
ml2/4

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Engineering Mechanics
A machine having an efficiency less than 50%, is known as

Ideal machine
Neither reversible nor non-reversible machine
Reversible machine
Non-reversible machine

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Engineering Mechanics
The forces, which meet at one point and their lines of action also lie on the same plane, are known as

Coplanar concurrent forces
Non-coplanar concurrent forces
Coplanar non-concurrent forces
Non-coplanar non-concurrent forces

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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.)

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

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Engineering Mechanics
In a screw jack, the effort required to lower the load is __________ the effort required to raise the same load.

Equal to
More than
None of these
Less than

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Engineering Mechanics
A rubber ball is dropped from a height of 2 m. If there is no loss of velocity after rebounding, the ball will rise to a height of

3 m
2 m
4 m
1 m

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