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Engineering Mechanics

Engineering Mechanics
The velocity of a body on reaching the ground from a height h, is

2.√(gh)
√(2gh)
2g.√h
√(gh)

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Engineering Mechanics
The moment of inertia of a rectangular section 3 cm wide and 4 cm deep about X-X axis is

9 cm4
16 cm4
12 cm4
20 cm4

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Engineering Mechanics
According to parallel axis theorem, the moment of inertia of a section about an axis parallel to the axis through center of gravity (i.e. IP) is given by(where, A = Area of the section, IG = Moment of inertia of the section about an axis passing through its C.G., and h = Distance between C.G. and the parallel axis.)

IP = IG - Ah2
IP = Ah2 / IG
IP = IG + Ah2
IP = IG / Ah2

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Engineering Mechanics
The efficiency of a lifting machine is the ratio of

Work done by the machine to the work done on the machine
Output to the input
All of these
Mechanical advantage to the velocity ratio

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Engineering Mechanics
A force while acting on a body may

Give rise to the internal stresses in it
All of these
Balance the forces, already acting on it
Change its motion

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Engineering Mechanics
The force required to move the body up the plane will be minimum if it makes an angle with the inclined plane __________ the angle of friction.

None of these
Greater than
Less than
Equal to

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MORE MCQ ON Engineering Mechanics

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