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

non-coplaner non-concurrent forces

The moment of a force

is the turning effect produced by a force, on the body, on which it acts

is equal to the product of force acting on the body and the perpendicular distance of a point and the line of action of the force

is equal to twice the area of the traingle, whose base is the line representing the force and whose vertex is the point, about which the moment is taken

A lead ball with a certain velocity is made to strike a wall, it falls down, but rubber ball of same mass and with same velocity strikes the same wall, it rebounds. Select the correct reason from the following:

the change in momentum suffered by rubber ball is less than the lead ball

both the balls undergo an equal change in momentum

the change in momentum suffered by rubber ball is more than the lead ball

the change in momentum suffered by rubber ball is less than the lead ball

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

neither reversible nor non-reversible machine

Which of the following statement is correct in connection with projectiles?

A path, traced by a projectile in the space, is known as trajectory.

The velocity with which a projectile is projected, is known as the velocity of projection.

The angle, with the horizontal, at which a projectile is projected is known as angle of projection.

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

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.

606 + Mcqs in Engineering Mechanics in Mechanical Engineering Page 1 McqOptions

1.	The , which meet at one point and their lines of action also lie on the same plane, are known as
A.	coplaner concurrent forces
B.	coplaner non-concurrent forces
C.	non-coplaner concurrent forces
D.	non-coplaner non-concurrent forces
Answer» B. coplaner non-concurrent forces

Discussion

2.	The amount by which the outer edge of the rail is raised, is known as super-elevation.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

3.	The potential energy stored by a spring in compression, is called strain energy.
A.	Yes
B.	No
Answer» B. No

Discussion

4.	The moment of a force
A.	is the turning effect produced by a force, on the body, on which it acts
B.	is equal to the product of force acting on the body and the perpendicular distance of a point and the line of action of the force
C.	is equal to twice the area of the traingle, whose base is the line representing the force and whose vertex is the point, about which the moment is taken
D.	all of the above
Answer» E.

Discussion

5.	In a single threaded worm and worm wheel, the number of teeth on the worm is 50. The diameter of the effort wheel is 100 mm and that of load drum is 50 mm. The velocity ratio is
A.	50
B.	100
C.	150
D.	200
Answer» C. 150

Discussion

6.	The total motion possessed by a body, is called
A.	impulsive force
B.	mass
C.	weight
D.	momentum
Answer» E.

Discussion

7.	The angle of inclination of the plane at which the body begins to move down the plane, is called
A.	angle of friction
B.	angle of repose
C.	angle of projection
D.	none of these
Answer» B. angle of repose

Discussion

8.	The moment of the force about as shown in the below figure is
A.	x
B.	x
C.	x
D.	x
Answer» D. x

Discussion

9.	The angle which the normal reaction makes with the resultant reaction is called angle of friction.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

10.	In a framed structure, as shown in the below figure, the force in the member is __________ the force in member .
A.	half
B.	equal to
C.	double
Answer» B. equal to

Discussion

11.	A lead ball with a certain velocity is made to strike a wall, it falls down, but rubber ball of same mass and with same velocity strikes the same wall, it rebounds. Select the correct reason from the following:
A.	both the balls undergo an equal change in momentum
B.	the change in momentum suffered by rubber ball is more than the lead ball
C.	the change in momentum suffered by rubber ball is less than the lead ball
D.	none of the above
Answer» C. the change in momentum suffered by rubber ball is less than the lead ball

Discussion

12.	If the resultant of a number of forces acting on a body is zero, then the body will not be in equilibrium.
A.	Yes
B.	No
Answer» C.

Discussion

13.	The friction experienced by a body, when at rest, is known as
A.	static friction
B.	dynamic friction
C.	limiting friction
D.	coefficient of friction
Answer» B. dynamic friction

Discussion

14.	The moment of inertia of a solid sphere of mass and radius is
A.	2
B.	/3
C.	2
D.	/5
E.	/2
Answer» C. 2

Discussion

15.	The matter contained in a body, is called
A.	impulsive force
B.	mass
C.	weight
D.	momentum
Answer» C. weight

Discussion

16.	The centre of percussion is below the centre of gravity of the body and is at a distance equal to
A.	/
B.	/
C.	/
D.	x
Answer» D. x

Discussion

17.	If a number of coplaner forces acting at a point be in equilibrium, the sum of clockwise moments must be __________ the sum of anticlockwise moments, about any point.
A.	equal to
B.	less than
C.	greater than
Answer» B. less than

Discussion

18.	The forces, which do not meet at one point, but their lines of action lie on the same plane, are known as coplaner non-concurrent forces.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

19.	If three forces acting at a point be represented in magnitude and direction by the three sides of a triangle, taken in order, the forces shall be in equilibrium.
A.	True
B.	False
Answer» B. False

Discussion

20.	Moment of inertia of a hollow circular section, as shown in the below figure about an axis perpendicular to the section, is __________ than that about - axis.
A.	two times
B.	same
C.	half
Answer» B. same

Discussion

21.	The amplitude is always __________ radius of the circle.
A.	equal to
B.	less than
C.	greater than
Answer» B. less than

Discussion

22.	When a body falls freely under gravitational force, it possesses __________ weight.
A.	no
B.	minimum
C.	maximum
Answer» B. minimum

Discussion

23.	The centre of gravity of a quadrant of a circle lies along its central radius () at a distance of
A.	0.5
B.	0.6
C.	0.7
D.	0.8
Answer» C. 0.7

Discussion

24.	A machine having an efficiency greater than 50%, is known as
A.	reversible machine
B.	non-reversible machine
C.	neither reversible nor non-reversible machine
D.	ideal machine
Answer» B. non-reversible machine

Discussion

25.	Moment of inertia of a triangular section of base () and height () about an axis passing through its vertex and parallel to the base, is __________ than that passing through its C.G. and parallel to the base.
A.	nine times
B.	six times
C.	four times
D.	two times
Answer» B. six times

Discussion

26.	If a body is thrown upwards, then the gravitational acceleration is taken as zero.
A.	Correct
B.	Incorrect
Answer» C.

Discussion

27.	An ideal machine is one whose efficiency is
A.	between 60 and 70 %
B.	between 70 and 80%
C.	between 80 and 90%
D.	100%
Answer» E.

Discussion

28.	Moment of inertia is the
A.	second moment of force
B.	second moment of area
C.	second moment of mass
D.	all of these
Answer» E.

Discussion

29.	When the lift is moving upwards with some acceleration, the pressure exerted by a man is __________ proportional to its acceleration.
A.	directly
B.	inversely
Answer» B. inversely

Discussion

30.	Two forces are acting at an angle of 120°. The bigger force is 40N and the resultant is perpendicular to the smaller one. The smaller force is
A.	20 N
B.	40 N
C.	80 N
D.	none of these
Answer» B. 40 N

Discussion

31.	The centre of gravity a -section 100 mm x 150 mm x 50 mm from its bottom is
A.	50mm
B.	75mm
C.	87.5mm
D.	125mm
Answer» D. 125mm

Discussion

32.	Which of the following statement is correct in connection with projectiles?
A.	A path, traced by a projectile in the space, is known as trajectory.
B.	The velocity with which a projectile is projected, is known as the velocity of projection.
C.	The angle, with the horizontal, at which a projectile is projected is known as angle of projection.
D.	all of the above
Answer» E.

Discussion

33.	The acceleration of a body sliding down an inclined surface is
A.	sin θ
B.	cos θ
C.	tan θ
D.	none of these
Answer» B. cos θ

Discussion

34.	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
A.	area of the triangle
B.	twice the area of the triangle
C.	half the area of the triangle
D.	none of these
Answer» C. half the area of the triangle

Discussion

35.	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
A.	/2
B.	/3
C.	/4
D.	none of these
Answer» E.

Discussion

36.	If the masses of both the bodies, as shown in the below figure, are doubled, then the acceleration in the string will be
A.	same
B.	half
C.	double
Answer» B. half

Discussion

37.	If the body falls freely under gravity, then the gravitational acceleration is taken as
A.	+8.9 m/s
B.	-8.9 m/s
C.	+9.8 m/s
D.	-9.8 m/s
Answer» D. -9.8 m/s

Discussion

38.	A framed structure, as shown in the below figure, is a
A.	perfect frame
B.	deficient frame
C.	redundant frame
D.	none of the above
Answer» B. deficient frame

Discussion

39.	The polygon law of forces states that if a number of forces, acting simultaneously on a particle, be represented in magnitude and direction by the sides a polygon taken in order, then their resultant is represented in magnitude and direction by the closing side of the polygon, taken in opposite direction.
A.	Correct
B.	Incorrect
Answer» B. Incorrect

Discussion

40.	A smooth cylinder lying on a __________ is in neutral equilibrium.
A.	curved surface
B.	convex surface
C.	horizontal surface
Answer» D.

Discussion

41.	Varingon's theorem of moments states that if a number of coplaner forces acting on a particle are in equilibrium, then
A.	their algebraic sum is zero
B.	their lines of action are at equal distances
C.	the algebraic sum of their moments about any point in their plane is zero
D.	the algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point.
Answer» E.

Discussion

42.	The radius of gyration is the distance where the whole mass (or area) of a body is assumed to be concentrated.
A.	Correct
B.	Incorrect
Answer» B. Incorrect

Discussion

43.	If three coplaner forces acting on a point are in equilibrium, then each force is proportional to the sine, of the angle between the other two.
A.	Correct
B.	Incorrect
Answer» B. Incorrect

Discussion

44.	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
A.	1m
B.	2m
C.	3m
D.	4m
Answer» C. 3m

Discussion

45.	In a framed structure, as shown in the below figure, the force in the member is tensile in nature.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

46.	An irregular body may have more than one centre of gravity.
A.	Yes
B.	No
Answer» C.

Discussion

47.	The rate of doing work is known as
A.	potential energy
B.	kinetic energy
C.	power
D.	none of these
Answer» D. none of these

Discussion

48.	In a wormed geared pulley block, if the number of teeth on the worm wheel is doubled, then its velocity ratio is also doubled.
A.	True
B.	False
Answer» B. False

Discussion

49.	The centre of oscillation and centre of suspension for a compound pendulum are interchangeable.
A.	True
B.	False
Answer» B. False

Discussion

50.	The unit of work in S.I. units is
A.	newton
B.	erg
C.	kg-m
D.	joule
Answer» E.

Discussion

Explore topic-wise MCQs in Mechanical Engineering.

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

The amount by which the outer edge of the rail is raised, is known as super-elevation.

The potential energy stored by a spring in compression, is called strain energy.

The moment of a force

In a single threaded worm and worm wheel, the number of teeth on the worm is 50. The diameter of the effort wheel is 100 mm and that of load drum is 50 mm. The velocity ratio is

The total motion possessed by a body, is called

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

The moment of the force about as shown in the below figure is

The angle which the normal reaction makes with the resultant reaction is called angle of friction.

In a framed structure, as shown in the below figure, the force in the member is __________ the force in member .

A lead ball with a certain velocity is made to strike a wall, it falls down, but rubber ball of same mass and with same velocity strikes the same wall, it rebounds. Select the correct reason from the following:

If the resultant of a number of forces acting on a body is zero, then the body will not be in equilibrium.

The friction experienced by a body, when at rest, is known as

The moment of inertia of a solid sphere of mass and radius is

The matter contained in a body, is called

The centre of percussion is below the centre of gravity of the body and is at a distance equal to

If a number of coplaner forces acting at a point be in equilibrium, the sum of clockwise moments must be __________ the sum of anticlockwise moments, about any point.

The forces, which do not meet at one point, but their lines of action lie on the same plane, are known as coplaner non-concurrent forces.

If three forces acting at a point be represented in magnitude and direction by the three sides of a triangle, taken in order, the forces shall be in equilibrium.

Moment of inertia of a hollow circular section, as shown in the below figure about an axis perpendicular to the section, is __________ than that about - axis.

The amplitude is always __________ radius of the circle.

When a body falls freely under gravitational force, it possesses __________ weight.

The centre of gravity of a quadrant of a circle lies along its central radius () at a distance of

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

Moment of inertia of a triangular section of base () and height () about an axis passing through its vertex and parallel to the base, is __________ than that passing through its C.G. and parallel to the base.

If a body is thrown upwards, then the gravitational acceleration is taken as zero.

An ideal machine is one whose efficiency is

Moment of inertia is the

When the lift is moving upwards with some acceleration, the pressure exerted by a man is __________ proportional to its acceleration.

Two forces are acting at an angle of 120°. The bigger force is 40N and the resultant is perpendicular to the smaller one. The smaller force is

The centre of gravity a -section 100 mm x 150 mm x 50 mm from its bottom is

Which of the following statement is correct in connection with projectiles?

The acceleration of a body sliding down an inclined surface is

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

If the masses of both the bodies, as shown in the below figure, are doubled, then the acceleration in the string will be

If the body falls freely under gravity, then the gravitational acceleration is taken as

A framed structure, as shown in the below figure, is a

A smooth cylinder lying on a __________ is in neutral equilibrium.

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

The radius of gyration is the distance where the whole mass (or area) of a body is assumed to be concentrated.

If three coplaner forces acting on a point are in equilibrium, then each force is proportional to the sine, of the angle between the other two.

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

In a framed structure, as shown in the below figure, the force in the member is tensile in nature.

An irregular body may have more than one centre of gravity.

The rate of doing work is known as

In a wormed geared pulley block, if the number of teeth on the worm wheel is doubled, then its velocity ratio is also doubled.

The centre of oscillation and centre of suspension for a compound pendulum are interchangeable.

The unit of work in S.I. units is