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Engineering Mechanics

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

More than
Equal to
Less than
None of these

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Engineering Mechanics
Two forces are acting at an angle of 120°. The bigger force is 40 N and the resultant is perpendicular to the smaller one. The smaller force is

20 N
None of the listed here
40 N
120 N

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

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

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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

Thrice
Same as
Four times
Twice

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Engineering Mechanics
The unit of moment of inertia of an area is

m4
kg-m-s2
kg-m2
kg/m2

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Engineering Mechanics
An ideal machine is one whose efficiency is

Between 80 and 90%
Between 60 and 70 %
Between 70 and 80%
1

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