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Engineering Mechanics

Engineering Mechanics
The moment of inertia of a square of side a about its diagonal is

a⁴/12
a⁴/16
a²/8
a³/12

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Engineering Mechanics
The range of a projectile is maximum, when the angle of projection is

90°
45°
30°
60°

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Engineering Mechanics
Coefficient of friction depends upon

None of these
Nature of surface only
Both (A) and (B)
Area of contact only

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Engineering Mechanics
An ideal machine is one whose efficiency is

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

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Engineering Mechanics
The velocity ratio for the first system of pulleys is (where n is the number of pulleys.)

n
n²
2n
2n - 1

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Engineering Mechanics
A framed structure is perfect, if the number of members are __________ (2j - 3), where j is the number of joints.

Greater than
Equal to
Less than
None of these

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