MECHANICAL ENGINEERING (ENGINEERING MECHANICS) MCQs

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

rolling friction

dynamic friction

limiting friction

static friction

Correct! Wrong!

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

v/2

v/4

v/8

Correct! Wrong!

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

sin θ

cos θ

tan θ

cosec θ

Correct! Wrong!

The mechanical advantage of a lifting machine is the ratio of

distance moved by effort to the distance moved by load

load lifted to the effort applied

output to the input

all of the above

Correct! Wrong!

Static friction is always __________ dynamic friction

equal to

less than

greater than

none

Correct! Wrong!

The bodies which rebound after impact are called

inelastic bodies

elastic bodies

neither elastic nor inelastic bodies

none of these

Correct! Wrong!

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

principle of independence of forces

principle of resolution of forces

principle of transmissibility of forces

none of these

Correct! Wrong!

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

0° and 180°

180° and 0°

90° and 180°

90° and 0°

Correct! Wrong!

A redundant frame is also called __________ frame.

perfect

imperfect

deficient

none

Correct! Wrong!

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

simple pendulum

compound pendulum

torsional pendulum

second's pendulum

Correct! Wrong!

Work done is said to be zero, when

some force acts on a body, but displacement is zero

no force acts on a body but some displacement takes place

either (a) or (b)

none of the above

Correct! Wrong!

One watt is equal to

0.1 joule/s

1 joule/s

10 joules/s

100 joules/s

Correct! Wrong!

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.

equal to

less than

greater than

none

Correct! Wrong!

The point, through which the whole weight of the body acts, irrespective of its position, is known as

moment of inertia

centre of gravity

centre of percussion

centre of mass

Correct! Wrong!

The rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction in which the force acts. This statement is known as

Newton's first law of motion

Newton's second law of motion

Newton's third law of motion

none of these

Correct! Wrong!

The minimum force required to slide a body of weight W on a rough horizontal plane is

W sin θ

W cos θ

W tan θ

none of these

Correct! Wrong!

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

a2/8

a3/12

a4/12

a4/16

Correct! Wrong!

The maximum efficiency of a lifting machine is

1/m

V.R./m

m/V.R.

1/(m x V.R.)

Correct! Wrong!

The acceleration of a particle moving with simple harmonic motion, at any instant is given by

ω.y

ω2.y

ω2 /y

ω3.y

Correct! Wrong!

A machine having an efficiency less than 50%, is known as

reversible machine

non-reversible machine

neither reversible nor non-reversible machine

ideal machine

Correct! Wrong!

Varingon's theorem of moments states that if a number of coplaner forces acting on a particle are in equilibrium, then

their algebraic sum is zero

their lines of action are at equal distances

the algebraic sum of their moments about any point in their plane is zero

the algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point.

Correct! Wrong!

The centre of gravity of a right circular solid cone is at a distance of __________ from its base, measured along the vertical axis.(where h = Height of a right circular solid cone.)

h/2

h/3

h/4

h/6

Correct! Wrong!

A rubber ball is dropped from a height of 2 m. If there is no loss of velocity after rebounding, the ball will rise to a height of

Correct! Wrong!

When the spring of a watch is wound, it will possess

strain energy

kinetic energy

heat energy

electrical energy

Correct! Wrong!

The rate of doing work is known as

potential energy

kinetic energy

power

none of these

Correct! Wrong!

Moment of inertia of a circular section about its diameter (d) is

πd^3/16

πd^3/32

πd^4/32

πd^4/64

Correct! Wrong!

The static friction

bears a constant ratio to the normal reaction between the two surfaces

is independent of the area of contact, between the two surfaces

always acts in a direction, opposite to that in which the body tends to move

all of the above

Correct! Wrong!

The velocity of a particle moving with simple harmonic motion is __________ at the mean position.

zero

minimum

maximum

none

Correct! Wrong!

The total energy possessed by a system of moving bodies

is constant at every instant

varies from point to point

is maximum in the start and minimum at the end

is minimum in the start and maximum at the end

Correct! Wrong!

For a self locking machine, the efficiency must be

equal to 50%

less than 50%

greater than 50%

100%

Correct! Wrong!

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

P = Q

Q = R

Q = 2R

none of these

Correct! Wrong!

Three forces acting on a rigid body are represented in magnitude, direction and line of action by the three sides of a triangle taken in order. The forces are equivalent to a couple whose moment is equal to

area of the triangle

twice the area of the triangle

half the area of the triangle

none of these

Correct! Wrong!

If tension in the cable supporting a lift moving downwards is half the tension when it is moving upwards, the acceleration of the lift is

g/2

g/3

g/4

none of these

Correct! Wrong!

The resultant of two forces P and Q (such that P > Q) acting along the same straight line, but in opposite direction, is given by

P + Q

P - Q

P / Q

Q / P

Correct! Wrong!

The law of motion involved in the recoil of gun is

Newton's first law of motion

Newton's second law of motion

Newton's third law of motion

none of these

Correct! Wrong!

The forces, which meet at one point and their lines of action also lie on the same plane, are known as

coplaner concurrent forces

coplaner non-concurrent forces

non-coplaner concurrent forces

non-coplaner non-concurrent forces

Correct! Wrong!

The angle of inclination of the plane at which the body begins to move down the plane, is called

angle of friction

angle of repose

angle of projection

none of these

Correct! Wrong!

The force applied on a body of mass 100 kg to produce an acceleration of 5 m/s2, is

20N

100N

500N

none of these

Correct! Wrong!

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

equal to

less than

greater than

either (b) or (c)

Correct! Wrong!

Which of the following statement is correct?

The algebraic sum of the forces, constituting the couple is zero.

The algebraic sum of the forces, constituting the couple, about any point is the same.

A couple cannot be balanced by a single force but can be balanced only by a couple of opposite sense.

all of the above

Correct! Wrong!

MECHANICAL ENGINEERING (ENGINEERING MECHANICS) MCQs

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

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

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

The mechanical advantage of a lifting machine is the ratio of

Static friction is always __________ dynamic friction

The bodies which rebound after impact are called

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

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

A redundant frame is also called __________ frame.

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

Work done is said to be zero, when

One watt is equal to

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.

The point, through which the whole weight of the body acts, irrespective of its position, is known as

The rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction in which the force acts. This statement is known as

The minimum force required to slide a body of weight W on a rough horizontal plane is

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

The maximum efficiency of a lifting machine is

The acceleration of a particle moving with simple harmonic motion, at any instant is given by

A machine having an efficiency less than 50%, is known as

Varingon's theorem of moments states that if a number of coplaner forces acting on a particle are in equilibrium, then

The centre of gravity of a right circular solid cone is at a distance of __________ from its base, measured along the vertical axis.(where h = Height of a right circular solid cone.)

A rubber ball is dropped from a height of 2 m. If there is no loss of velocity after rebounding, the ball will rise to a height of

When the spring of a watch is wound, it will possess

The rate of doing work is known as

Moment of inertia of a circular section about its diameter (d) is

The static friction

The velocity of a particle moving with simple harmonic motion is __________ at the mean position.

The total energy possessed by a system of moving bodies

For a self locking machine, the efficiency must be

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

Three forces acting on a rigid body are represented in magnitude, direction and line of action by the three sides of a triangle taken in order. The forces are equivalent to a couple whose moment is equal to

If tension in the cable supporting a lift moving downwards is half the tension when it is moving upwards, the acceleration of the lift is

The resultant of two forces P and Q (such that P > Q) acting along the same straight line, but in opposite direction, is given by

The law of motion involved in the recoil of gun is

The forces, which meet at one point and their lines of action also lie on the same plane, are known as

The angle of inclination of the plane at which the body begins to move down the plane, is called

The force applied on a body of mass 100 kg to produce an acceleration of 5 m/s2, is

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

Which of the following statement is correct?

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