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Engineering Mechanics MCQ Questions & Answers

Engineering Mechanics MCQs : This section focuses on the "Engineering Mechanics". These Multiple Choice Questions (MCQs) should be practiced to improve the Engineering Mechanics skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.




Question 1

A body of weight W is required to move up on rough inclined plane whose angle of inclination with the horizontal is α. The effort applied parallel to the plane is given by(where μ = tanφ = Coefficient of friction between the plane and the body.)

A. P = W tanα
B. P = W tan(α + φ)
C. P = W (sinα + μcosα)
D. P = W (cosα + μsinα)

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Question 2

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.

A. equal to
B. less than
C. greater than

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Question 3

When a rigid body is suspended vertically, and it oscillates with a small amplitude under the action of the force of gravity, the body is known as

A. simple pendulum
B. compound pendulum
C. torsional pendulum
D. second's pendulum

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Question 4

The force which acts along the radius of a circle and directed away from the centre of the circle is called centrifugal force.

A. Agree
B. Disagree

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Question 5

The term 'force' may be defined as an agent which produces or tends to produce, destroys or tends to destroy motion.

A. Agree
B. Disagree

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Question 6

If a number of forces are acting at a point, theirresultant will be inclined at an angle θ with the horizontal, such that

A. tan θ = ∑H/∑V
B. tan θ = ∑V/∑H
C. tan θ = ∑Vx∑H

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Question 7

One watt is equal to

A. 0.1 joule/s
B. 1 joule/s
C. 10 joules/s
D. 100 joules/s

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Question 8

According to principle of conservation of energy, the total momentum of a system of masses in any direction remains constant unless acted upon by an external force in that direction.

A. TRUE
B. FALSE

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Question 9

The triangle law of forces states that if two forces acting simultaneously on a particle, be represented in magnitude and direction by the two sides of a triangle taken in order, then their resultant may be represented in magnitude and direction by the third side of a triangle, taken in opposite order.

A. TRUE
B. FALSE

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Question 10

If two bodies having masses m1 and m2 (m1>m2) have equal kinetic energies, the momentum of body having mass m1 is __________ the momentum of body having mass m2.

A. equal to
B. less than
C. greater than

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Question 11

Work done is said to be zero, when

A. some force acts on a body, but displacement is zero
B. no force acts on a body but some displacement takes place
C. either (a) or (b)
D. none of the above

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Question 12

The angle of inclination of a vehicle when moving along a circular path __________ upon its mass.

A. depends
B. does not depend

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Question 13

The centre of gravity of an equilateral triangle with each side a, is __________ from any of the three sides.

A. 3a/2
B. 23a
C. a/23
D. 32a

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Question 14

The velocity ratio in case of an inclined plane inclined at angle θ to the horizontal and weight being pulled up the inclined plane by vertical effort is

A. sin θ
B. cos θ
C. tan θ
D. cosec θ

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Question 15

A body will begin to move down an inclined plane if the angle of inclination of the plane is __________ the angle of friction.

A. equal to
B. less than
C. greater than

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Question 16

The friction experienced by a body, when in motion, is known as

A. rolling friction
B. dynamic friction
C. limiting friction
D. static friction

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Question 17

The unit of angular acceleration is

A. N-m
B. m/s
C. m/s2
D. rad/s2

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Question 18

The distance, between the point of projection and the point where the projectile strikes the ground, is known as range.

A. Correct
B. Incorrect

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Question 19

If the resultant of two equal forces has the same magnitude as either of the forces, then the angle between the two forces is

A. 30°
B. 60°
C. 90°
D. 120°

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Question 20

Moment of inertia of a circular section about an axis perpendicular to the section is

A. πd3/16
B. πd3/32
C. πd4/32
D. πd4/64

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Question 21

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

A. v
B. v/2
C. v/4
D. v/8

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Question 22

When a particle moves along a circular path with uniform velocity, there will be no tangential acceleration.

A. Correct
B. Incorrect

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Question 23

The maximum frictional force, which comes into play, when a body just begins to slide over the surface of the other body, is known as

A. static friction
B. dynamic friction
C. limiting friction
D. coefficient of friction

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Question 24

The angle between two forces when the resultant is maximum and minimum respectively are

A. 0° and 180°
B. 180° and 0°
C. 90° and 180°
D. 90° and 0°

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Question 25

two like parallel forces are acting at a distance of 24 mm apart and their resultant is 20 N. It the line of action of the resultant is 6 mm from any given force, the two forces are

A. 15 N and 5 N
B. 20 N and 5 N
C. 15 N and 15 N
D. none of these

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Question 26

The bodies which rebound after impact are called

A. inelastic bodies
B. elastic bodies
C. neither elastic nor inelastic bodies
D. none of these

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Question 27

The coefficient of restitution for elastic bodies is one.

A. Correct
B. Incorrect

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Question 28

Static friction is always __________ dynamic friction.

A. equal to
B. less than
C. greater than

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Question 29

The path of the projectile is a parabola.

A. TRUE
B. FALSE

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Question 30

Which of the following is an equation of linear motion?(where, u and v = Initial and final velocity of the body, a = Acceleration of the body, and s = Displacement of the body in time t seconds.)

A. v = u + a.t
B. s = u.t + 1/2 a.t2
C. v2 = u2+2a.s
D. all of these

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Question 31

A smooth cylinder lying on its convex surface remains in __________ equilibrium.

A. stable
B. unstable
C. neutral

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Question 32

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

A. bh3/4
B. bh3/8
C. bh3/12
D. bh3/36

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Question 33

During elastic impact, the relative velocity of the two bodies after impact is __________ the relative velocity of the two bodies before impact.

A. equal to
B. equal and opposite to
C. less than
D. greater than

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Question 34

A redundant frame is also called __________ frame.

A. perfect
B. imperfect
C. deficient

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Question 35

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

A. 30°
B. 45°
C. 60°
D. 90°

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Question 36

A resultant force is a single force which produces the same effect as produced by all the given forces acting on a body.

A. TRUE
B. FALSE

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Question 37

Coefficient of friction is the ratio of the limiting friction to the normal reaction between the two bodies.

A. Yes
B. No

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Question 38

The range of projectile on a downward inclined plane is __________ the range on upward inclined plane for the same velocity of projection and angle of projection.

A. less than
B. more than
C. equal to

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Question 39

The mechanical advantage of a lifting machine is the ratio of

A. distance moved by effort to the distance moved by load
B. load lifted to the effort applied
C. output to the input
D. all of the above

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Question 40

The total time taken by a projectile to reach maximum height and to return back to the ground, is known as time of flight.

A. Yes
B. No

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Question 41

If two blocks of equal mass are attached to the two ends of a light string and one of the blocks is placed over a smooth horizontal plane while the other is hung freely after passing over a smooth pulley, then the two blocks will have some motion.

A. Agree
B. Disagree

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Question 42

The algebraic sum of the resolved parts of a number of forces in a given direction is equal to the resolved part of their resultant in the same direction. This is known as

A. principle of independence of forces
B. principle of resolution of forces
C. principle of transmissibility of forces
D. none of these

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