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Engineering Mechanics

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

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

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Engineering Mechanics
Moment of inertia of a rectangular section having width (b) and depth (d) about an axis passing through its C.G. and parallel to the width (b), is

db³/36
bd³/12
bd³/36
db³/12

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Engineering Mechanics
On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be

Upwards at its upper end
Downwards at its upper end
Zero at its upper end
Perpendicular to the wall at its upper end

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Engineering Mechanics
The acceleration of a body sliding down an inclined surface is

g cosθ
g tanθ
None of these
g sinθ

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Engineering Mechanics
An ideal machine is one whose efficiency is

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

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Engineering Mechanics
The centre of percussion of the homogeneous rod of length ‘L’ suspended at the top will be

3L/4
L/3
L/2
2L/3

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MORE MCQ ON Engineering Mechanics

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