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Engineering Mechanics

Engineering Mechanics
The coefficient of friction depends upon

Nature of surfaces
Area of contact
All of these
Shape of the surfaces

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Engineering Mechanics
Mass moment of inertia of a uniform thin rod of mass M and length (l) about its mid-point and perpendicular to its length is

(1/12) Ml²
(1/3) Ml²
(3/4) Ml²
(2/3) Ml²

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

Newton
joule
kg-m
erg

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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
db³/12
bd³/36
bd³/12

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Engineering Mechanics
In ideal machines, mechanical advantage is __________ velocity ratio.

Equal to
None of these
Less than
Greater than

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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

mr²/2
mr²/4
mr²/8
mr²/6

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