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Engineering Mechanics

Engineering Mechanics
The ratio of static friction to dynamic friction is always

Less than one
Equal to one
None of these
Greater than one

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Engineering Mechanics
On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be

Perpendicular to the wall at its upper end
Downwards at its upper end
Zero at its upper end
Upwards at its upper end

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Engineering Mechanics
The resultant of the two forces ‘P’ and ‘Q’ is ‘R’. If ‘Q’ is doubled, the new resultant is perpendicular to ‘P’. Then

Q = 2R
None of the listed here
P = Q
Q = R

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Engineering Mechanics
If u₁ and u₂ are the velocities of two moving bodies in the same direction before impact and v₁ and v₂ are their velocities after impact, then coefficient of restitution is given by

(u₁ - u₂)/(v₁ - v₂)
(u₂ + u₁)/(v₂ + v₁)
(v₂ - v₁)/(u₁ - u₂)
(v₁ - v₂)/(u₁ - u₂)

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Engineering Mechanics
The maximum efficiency of a lifting machine is

m/V.R.
1/(m × V.R.)
1/m
V.R./m

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Engineering Mechanics
The range of projectile will be maximum for a given velocity of projectile, when the angle of projection (α) is

β/2
45° + β/2
30° + β/2
60° + β/2

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MORE MCQ ON Engineering Mechanics

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