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Engineering Mechanics

Engineering Mechanics
Mass moment of inertia of a thin rod about its one end is ___________ the mass moment of inertia of the same rod about its mid-point

Same as
Twice
Four times
Thrice

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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
Less than
More than
None of these

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Engineering Mechanics
A block of mass 20 kg lying on a rough horizontal plane is connected by a light string passing over a smooth pulley to another mass 5 kg, which can move freely in the Vertical direction, as shown in the below figure. The tension in the string will ___________ with the increase in coefficient of friction.

Increase
Not be effected
None of these
Decrease

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

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

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Engineering Mechanics
When the lift is moving upwards with some acceleration, the pressure exerted by a man is __________ to its acceleration.

Cube root
Inversely proportional
None of these
Directly proportional

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Engineering Mechanics
The center of gravity of a quadrant of a circle lies along its central radius (r) at a distance of

0.8 r
0.5 r
0.6 r
0.7 r

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