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Engineering Mechanics

Engineering Mechanics
Moment of inertia of a triangular section of base (b) and height (h) about an axis passing through its C.G. and parallel to the base, is

bh3/4
bh3/36
bh3/12
bh3/8

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Engineering Mechanics
In actual machines, mechanical advantage is _________ velocity ratio.

Equal to
Greater than
Less than
None of these

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Engineering Mechanics
The periodic time of one oscillation for a simple pendulum is (where l = Length of the pendulum.)

(1/2π). √(l/g)
None of these
(1/2π). √(g/l)
2π. √(l/g)

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Engineering Mechanics
If rain is falling in the opposite direction of the movement of a pedestrian, he has to hold his umbrella

Less inclined when standing
More inclined when moving
More inclined when standing
Less inclined when moving

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Engineering Mechanics
Two balls of equal mass and of perfectly elastic material are lying on the floor. One of the balls with velocity ‘v’ is made to strike the second ball. Both the balls after impact will move with a velocity

v
v/4
v/8
v/2

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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

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

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