R4RIN – MCQs, Mock Tests | Engineering Mechanical Engineering Engineering MCQS -Mechanics Section-1

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

1. rolling friction
2. dynamic friction
3. limiting friction
4. static friction

✅ Correct Answer: 2

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

1. v
2. v/2
3. v/4
4. v/8

✅ Correct Answer: 2

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

1. sin θ
2. cos θ
3. tan θ
4. cosec θ

✅ Correct Answer: 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.)

1. P = W tanα
2. P = W tan(α + φ)
3. P = W (sinα + μcosα)
4. P = W (cosα + μsinα)

✅ Correct Answer: 3

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

1. 30°
2. 60°
3. 90°
4. 120°

✅ Correct Answer: 4

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

1. stable
2. unstable
3. neutral
4. None of these

✅ Correct Answer: 2

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

1. πd3/16
2. πd3/32
3. πd4/32
4. πd4/64

✅ Correct Answer: 3

The unit of angular acceleration is

1. N-m
2. m/s
3. m/s2
4. rad/s2

✅ Correct Answer: 4

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

1. bh3/4
2. bh3/8
3. bh3/12
4. bh3/36

✅ Correct Answer: 4

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.)

1. v = u + a.t
2. s = u.t + 1/2 a.t2
3. v2 = u2+2a.s
4. all of these

✅ Correct Answer: 4

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

1. 30°
2. 45°
3. 60°
4. 90°

✅ Correct Answer: 2

The mechanical advantage of a lifting machine is the ratio of

1. distance moved by effort to the distance moved by load
2. load lifted to the effort applied
3. output to the input
4. all of the above

✅ Correct Answer: 2

Static friction is always __________ dynamic friction.

1. equal to
2. less than
3. greater than
4. None of these

✅ Correct Answer: 3

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

1. equal to
2. less than
3. greater than
4. None of these

✅ Correct Answer: 3

The bodies which rebound after impact are called

1. inelastic bodies
2. elastic bodies
3. neither elastic nor inelastic bodies
4. none of these

✅ Correct Answer: 2

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

1. static friction
2. dynamic friction
3. limiting friction
4. coefficient of friction

✅ Correct Answer: 3

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

1. principle of independence of forces
2. principle of resolution of forces
3. principle of transmissibility of forces
4. none of these

✅ Correct Answer: 2

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

1. 0° and 180°
2. 180° and 0°
3. 90° and 180°
4. 90° and 0°

✅ Correct Answer: 1

A redundant frame is also called __________ frame.

1. perfect
2. imperfect
3. deficient
4. none of these

✅ Correct Answer: 2

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

1. simple pendulum
2. compound pendulum
3. torsional pendulum
4. second's pendulum

✅ Correct Answer: 2

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

1. equal to
2. equal and opposite to
3. less than
4. . greater than

✅ Correct Answer: 2

Work done is said to be zero, when

1. some force acts on a body, but displacement is zero
2. no force acts on a body but some displacement takes place
3. either (a) or (b)
4. none of the above

✅ Correct Answer: 3

One watt is equal to

1. 0.1 joule/s
2. 1 joule/s
3. 10 joules/s
4. 100 joules/s

✅ Correct Answer: 4

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

1. 15 N and 5 N
2. 20 N and 5 N
3. 15 N and 15 N
4. none of these

✅ Correct Answer: 1

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.

1. equal to
2. less than
3. greater than
4. none of these

✅ Correct Answer: 3