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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.

None of these
Equal to
More than
Less than

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Engineering Mechanics
The resultant of two equal forces ‘P’ making an angle ‘θ’, is given by

2P tanθ/2
2P cosθ/2
2P cotθ/2
2P sinθ/2

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Engineering Mechanics
A ladder is resting on a smooth ground and leaning against a rough vertical wall. The force of friction will act

Away from the wall at its upper end
Towards the wall at its upper end
Upward at its upper end
Downward at its upper end

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Engineering Mechanics
The moment of inertia of a thin disc of mass ‘m’ and radius ‘r’, about an axis through its center of gravity and perpendicular to the plane of the disc is

mr²/8
mr²/2
mr²/4
mr²/6

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Engineering Mechanics
The units of moment of inertia of mass are

kg/m²
kg/m
kg-m²
m²/kg

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Engineering Mechanics
The unit of work in S.I. units is

kg-m
erg
Newton
joule

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