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Engineering Mechanics

Engineering Mechanics
The moment of inertia of a thin rod of mass 'm' and length 'l', about an axis through its centre of gravity and perpendicular to its length is

ml2/8
ml2/12
ml2/ 6
ml2/4

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Engineering Mechanics
The time of flight (t) of a projectile on an upward inclined plane is(where u = Velocity of projection, α = Angle of projection, and β = Inclination of the plane with the horizontal.)

t = 2u sin (α - β)/g cos β
t = 2u sin (α + β)/g cos β
t = g cos β/2u sin (α - β)
t = g cos β/2u sin (α + β)

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Engineering Mechanics
The forces, which meet at one point and their lines of action also lie on the same plane, are known as

Coplanar concurrent forces
Non-coplanar non-concurrent forces
Coplanar non-concurrent forces
Non-coplanar concurrent forces

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Engineering Mechanics
Three forces acting on a rigid body are represented in magnitude, direction and line of action by the three sides of a triangle taken in order. The forces are equivalent to a couple whose moment is equal to

Half the area of the triangle
Area of the triangle
Twice the area of the triangle
None of these

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Engineering Mechanics
The moment of inertia of a square of side (a) about an axis through its center of gravity is

a4/12
a4/8
a4/4
a4/36

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

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

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MORE MCQ ON Engineering Mechanics

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