33 + Mcqs in Engineering Mechanics Page 1 McqOptions

1.	If two bodies having masses m 1 and m 2 ( m 1 > m 2 ) have equal kinetic energies, the momentum of body having mass m 1 is __________ the momentum of body having mass m 2 .
A.	equal to
B.	less than
C.	greater than
D.	-
Answer» D. -

Discussion

2.	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
Answer» B. 20 N and 5 N

Discussion

3.	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
C.	-
D.	-
Answer» B. Disagree

Discussion

4.	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
Answer» D. none of the above

Discussion

5.	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
C.	-
D.	-
Answer» B. Disagree

Discussion

6.	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
C.	-
D.	-
Answer» B. False

Discussion

7.	A redundant frame is also called __________ frame.
A.	perfect
B.	imperfect
C.	deficient
D.	-
Answer» C. deficient

Discussion

8.	The path of the projectile is a parabola.
A.	True
B.	False
C.	-
D.	-
Answer» B. False

Discussion

9.	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
C.	-
D.	-
Answer» B. Disagree

Discussion

10.	The angle between two forces when the resultant is maximum and minimum respectively are
A.	0Â° and 180Â°
B.	180Â° and 0Â°
C.	90Â° and 180Â°
D.	90Â° and 0Â°
Answer» B. 180Â° and 0Â°

Discussion

11.	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
C.	-
D.	-
Answer» B. False

Discussion

12.	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
Answer» C. principle of transmissibility of forces

Discussion

13.	The centre of gravity of an equilateral triangle with each side a , is __________ from any of the three sides.
A.	3 a /2
B.	2 3 a
C.	a /2 3
D.	3 2 a
Answer» D. 3 2 a

Discussion

14.	The distance, between the point of projection and the point where the projectile strikes the ground, is known as range.
A.	Correct
B.	Incorrect
C.	-
D.	-
Answer» B. Incorrect

Discussion

15.	When a particle moves along a circular path with uniform velocity, there will be no tangential acceleration.
A.	Correct
B.	Incorrect
C.	-
D.	-
Answer» B. Incorrect

Discussion

16.	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
D.	-
Answer» D. -

Discussion

17.	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
C.	-
D.	-
Answer» B. No

Discussion

18.	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
Answer» C. output to the input

Discussion

19.	The range of a projectile is maximum, when the angle of projection is
A.	30Â°
B.	45Â°
C.	60Â°
D.	90Â°
Answer» C. 60Â°

Discussion

20.	In the shown figure, if the angle of inclination of the plane is increased, then acceleration of the system will
A.	increase
B.	decrease
C.	remain the same
D.	-
Answer» C. remain the same

Discussion

21.	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
D.	-
Answer» B. less than

Discussion

22.	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 . t 2
C.	v 2 = u 2 +2 a . s
D.	all of these
Answer» E.

Discussion

23.	If the masses of both the bodies, as shown in the below figure, are reduced to 50 percent, then tension in the string will be
A.	same
B.	half
C.	double
D.	-
Answer» C. double

Discussion

24.	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.	bh 3 /4
B.	bh 3 /8
C.	bh 3 /12
D.	bh 3 /36
Answer» E.

Discussion

25.	A body of weight W is required to move up on rough inclined plane whose angle of inclination with the horizontal is ?. The effort applied parallel to the plane is given by(where ? = tan? = Coefficient of friction between the plane and the body.)
A.	P = W tan?
B.	P = W tan(? + ?)
C.	P = W (sin? + ?cos?)
D.	P = W (cos? + ?sin?)
Answer» D. P = W (cos? + ?sin?)

Discussion

26.	Moment of inertia of a circular section about an axis perpendicular to the section is
A.	? d 3 /16
B.	? d 3 /32
C.	? d 4 /32
D.	? d 4 /64
Answer» D. ? d 4 /64

Discussion

27.	Coefficient of friction is the ratio of the limiting friction to the normal reaction between the two bodies.
A.	Yes
B.	No
C.	-
D.	-
Answer» B. No

Discussion

28.	A smooth cylinder lying on its convex surface remains in __________ equilibrium.
A.	stable
B.	unstable
C.	neutral
D.	-
Answer» C. neutral

Discussion

29.	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.	30Â°
B.	60Â°
C.	90Â°
D.	120Â°
Answer» E.

Discussion

30.	The angle of inclination of a vehicle when moving along a circular path __________ upon its mass.
A.	depends
B.	does not depend
C.	-
D.	-
Answer» C. -

Discussion

31.	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
D.	-
Answer» C. equal to

Discussion

32.	The coefficient of restitution for elastic bodies is one.
A.	Correct
B.	Incorrect
C.	-
D.	-
Answer» C. -

Discussion

33.	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
C.	-
D.	-
Answer» C. -

Discussion

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If two bodies having masses m 1 and m 2 ( m 1 > m 2 ) have equal kinetic energies, the momentum of body having mass m 1 is __________ the momentum of body having mass m 2 .

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

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

Work done is said to be zero, when

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

A redundant frame is also called __________ frame.

The path of the projectile is a parabola.

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

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

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

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

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

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

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

The mechanical advantage of a lifting machine is the ratio of

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

In the shown figure, if the angle of inclination of the plane is increased, then acceleration of the system will

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.

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.)

If the masses of both the bodies, as shown in the below figure, are reduced to 50 percent, then tension in the string will be

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

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

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

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

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

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

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.

The coefficient of restitution for elastic bodies is one.

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.