4791 + Mcqs in Mechanical Engineering Page 47 McqOptions

2301.	Onejoule is equal to
A.	0.1 N-m
B.	1 N-m
C.	10 N-m
D.	100 N-m
Answer» C. 10 N-m

Discussion

2302.	Whenever a force acts on a body and the body undergoes a displacement, then
A.	work is said to be done
B.	power is being transmitted
C.	body has kinetic energy of translation
D.	none of these
Answer» B. power is being transmitted

Discussion

2303.	When a particle moves along a straight path, there will be centripetal acceleration as well as tangential acceleration.
A.	Correct
B.	Incorrect
Answer» C.

Discussion

2304.	The acceleration of a particle moving with simple harmonic motion is __________ at themean position.
A.	zero
B.	minimum
C.	maximum
Answer» B. minimum

Discussion

2305.	The velocity of a particle moving with simple harmonic motion is __________ at the mean position.
A.	zero
B.	minimum
C.	maximum
Answer» D.

Discussion

2306.	A framed structure is imperfect, if the number of members are __________ (2j - 3).
A.	equal to
B.	less than
C.	greater than
D.	either (b) or (c)
Answer» E.

Discussion

2307.	The total energy possessed by a system of moving bodies
A.	is constant at every instant
B.	varies from point to point
C.	is maximum in the start and minimum at the end
D.	is minimum in the start and maximum at the end
Answer» B. varies from point to point

Discussion

2308.	The static friction
A.	bears a constant ratio to the normal reaction between the two surfaces
B.	is independent of the area of contact, between the two surfaces
C.	always acts in a direction, opposite to that in which the body tends to move
D.	all of the above
Answer» E.

Discussion

2309.	The maximum height of a projectile on a horizontal plane, is
A.	<img src="/_files/images/mechanical-engineering/engineering-mechanics/43-222-1.png">
B.	<img src="/_files/images/mechanical-engineering/engineering-mechanics/43-222-2.png">
C.	<img src="/_files/images/mechanical-engineering/engineering-mechanics/43-222-3.png">
D.	<img src="/_files/images/mechanical-engineering/engineering-mechanics/43-222-4.png">
Answer» B. <img src="/_files/images/mechanical-engineering/engineering-mechanics/43-222-2.png">

Discussion

2310.	In a framed structure, as shown in the below figure, the force in the member CD is tensile in nature.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

2311.	An irregular body may have more than one centre of gravity.
A.	Yes
B.	No
Answer» C.

Discussion

2312.	The unit of work in S.I. units is
A.	newton
B.	erg
C.	kg-m
D.	joule
Answer» E.

Discussion

2313.	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

2314.	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

2315.	A block ot mass 20 kg lying on a rough horizontal plane is connected by a light string passing over a smooth pulley to another mass 5 kg, which can move freely in the Vertical direction, as shown in the below figure. The tension in the string will __________ with the increase in coefficient of friction.
A.	increase
B.	decrease
C.	not be effected
Answer» B. decrease

Discussion

2316.	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

2317.	A smooth cylinder lying on a __________ is in neutral equilibrium.
A.	curved surface
B.	convex surface
C.	horizontal surface
Answer» D.

Discussion

2318.	The velocity of a particle (v) moving with simple harmonic motion, at any instant is given by(where r = Amplitude of motion, and y = Displacement of the particle from mean position.)
A.	<img src="/_files/images/mechanical-engineering/engineering-mechanics/45-249-1.png">
B.	<img src="/_files/images/mechanical-engineering/engineering-mechanics/45-249-2.png">
C.	<img src="/_files/images/mechanical-engineering/engineering-mechanics/45-249-3.png">
D.	<img src="/_files/images/mechanical-engineering/engineering-mechanics/45-249-4.png">
Answer» C. <img src="/_files/images/mechanical-engineering/engineering-mechanics/45-249-3.png">

Discussion

2319.	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

2320.	Coplaner concurrent forces are those forces which
A.	meet at one point, but their lines of action do not lie on the same plane
B.	do not meet at one point and their lines of action do not lie on the same plane
C.	meet at one point and their lines of action also lie on the same plane
D.	do not meet at one point, but their lines of action lie on the same plane
Answer» D. do not meet at one point, but their lines of action lie on the same plane

Discussion

2321.	Mass moment of inertia of a thin rod about its one end is __________ the mass moment of inertia of the same rod about its mid-point
A.	same as
B.	twice
C.	thrice
D.	four times
Answer» E.

Discussion

2322.	Moment of inertia of a hollow rectangular section as shown in the below figure about Y-Y axis, is not the same as that about X-X axis.
A.	Yes
B.	No
Answer» B. No

Discussion

2323.	The angle of the inclined plane at which a body just begins to slide down the plane, is called helix angle.
A.	True
B.	False
Answer» C.

Discussion

2324.	The loss of kinetic energy due to direct impact of two bodies __________ upon the value of coefficient of restitution.
A.	depends
B.	does not depend
Answer» B. does not depend

Discussion

2325.	Moment of inertia of a rectangular section having width (b) and depth (d) about an axis passing through its C.G. and parallel to the width (b), is
A.	<img src="/_files/images/mechanical-engineering/engineering-mechanics/31-87-1.png">
B.	<img src="/_files/images/mechanical-engineering/engineering-mechanics/31-87-2.png">
C.	<img src="/_files/images/mechanical-engineering/engineering-mechanics/31-87-3.png">
D.	<img src="/_files/images/mechanical-engineering/engineering-mechanics/31-87-4.png">
Answer» C. <img src="/_files/images/mechanical-engineering/engineering-mechanics/31-87-3.png">

Discussion

2326.	Vectors method for the resultant force is also called polygon law of forces.
A.	Correct
B.	Incorrect
Answer» B. Incorrect

Discussion

2327.	Two equal and opposite parallel forces whose lines of action are different form a couple.
A.	Correct
B.	Incorrect
Answer» B. Incorrect

Discussion

2328.	When a person, on a bicycle, drives round a curve, he has to lean __________ to maintain equilibrium.
A.	inward
B.	outward
Answer» B. outward

Discussion

2329.	A circular hole of 50 mm diameter is cut out from a circular disc of 100 mm diameter as shown in the below figure. The centre of gravity of the section will lie
A.	in the shaded area
B.	in the hole
C.	at
D.	<b>O</b>
Answer» B. in the hole

Discussion

2330.	The centre of gravity of a right angled triangle lies at its geometrical centre.
A.	Correct
B.	Incorrect
Answer» C.

Discussion

2331.	The unit of power in S.I. units is
A.	horsepower
B.	joule
C.	watt
D.	kg-m
Answer» D. kg-m

Discussion

2332.	When two elastic bodies collide with each other,
A.	the two bodies will momentarily come to rest after collision
B.	the two bodies tend to compress and deform at the surface of contact
C.	the two bodies begin to regain their original shape
D.	all of the above
Answer» E.

Discussion

2333.	The centre of gravity of a triangle lies at a point where its medians intersect each other.
A.	True
B.	False
Answer» B. False

Discussion

2334.	The range of projectile will be maximum for a given velocity of projectile, when the angle of projection ( ) is
A.	/2
B.	30 + /2
C.	45 + /2
D.	60 + /2
Answer» D. 60 + /2

Discussion

2335.	If the number of pulleys in a system is equal to its velocity ratio, then it is a __________ system of pulleys
A.	first
B.	second
C.	third
Answer» C. third

Discussion

2336.	In order to double the period of simple pendulum, the length of the string should be
A.	halved
B.	doubled
C.	quadrupled
Answer» D.

Discussion

2337.	The moment of inertia of a square of side a about its base is a4/ 3.
A.	True
B.	False
Answer» B. False

Discussion

2338.	The law of motion involved in the recoil of gun is
A.	Newton's first law of motion
B.	Newton's second law of motion
C.	Newton's third law of motion
D.	none of these
Answer» D. none of these

Discussion

2339.	When a particle moves along a circular path, its acceleration has two components, one is normal component and the other is tangential component of acceleration.
A.	True
B.	False
Answer» B. False

Discussion

2340.	A machine which is not capable of doing any work in the reversed direction, after the effort is removed, is called a reversible machine.
A.	True
B.	False
Answer» C.

Discussion

2341.	The time of flight (t) of a projectile on a horizontal plane is given by
A.	<img src="/_files/images/mechanical-engineering/engineering-mechanics/42-218-1.png">
B.	<img src="/_files/images/mechanical-engineering/engineering-mechanics/42-218-2.png">
C.	<img src="/_files/images/mechanical-engineering/engineering-mechanics/42-218-3.png">
D.	<img src="/_files/images/mechanical-engineering/engineering-mechanics/42-218-4.png">
Answer» B. <img src="/_files/images/mechanical-engineering/engineering-mechanics/42-218-2.png">

Discussion

2342.	If a pendulum is taken 1 km below the earth surface in a mine, it will __________ in time.
A.	gain
B.	loose
Answer» B. loose

Discussion

2343.	A machine which is capable of doing work in the reversed direction, after the effort is removed, is called a non-reversible machine.
A.	Yes
B.	No
Answer» C.

Discussion

2344.	The force, by which the body is attracted, towards the centre of the earth, is called
A.	impulsive force
B.	mass
C.	weight
D.	momentum
Answer» D. momentum

Discussion

2345.	The time taken by a particle for one complete oscillation is known as periodic time.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

2346.	One joule means that
A.	work is done by a force of 1 N when it displaces a body through 1m
B.	work is done by a force of 1 kg when it displaces a body through 1 m
C.	work is done by a force of 1 dyne when it displaces a body through 1 cm
D.	work is done by a force of 1 g when it displaces a body through 1 cm
Answer» B. work is done by a force of 1 kg when it displaces a body through 1 m

Discussion

2347.	A non-reversible machine is also called a self-locking machine.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

2348.	The velocity ratio of a first system of pulleys with 4 pulleys is
A.	4
B.	8
C.	16
D.	20
Answer» D. 20

Discussion

2349.	In actual machines, mechanical advantage is __________ velocity ratio.
A.	equal to
B.	less than
C.	greater than
Answer» C. greater than

Discussion

2350.	If u1 and u2 are the velocities of two moving bodies in the same direction before impact and v1 and v2 are their velocities after impact, then coefficient of restitution is given by
A.	<img src="/_files/images/mechanical-engineering/engineering-mechanics/50-300-1.png">
B.	<img src="/_files/images/mechanical-engineering/engineering-mechanics/50-300-2.png">
C.	<img src="/_files/images/mechanical-engineering/engineering-mechanics/50-300-3.png">
D.	<img src="/_files/images/mechanical-engineering/engineering-mechanics/50-300-4.png">
Answer» C. <img src="/_files/images/mechanical-engineering/engineering-mechanics/50-300-3.png">

Discussion

Explore topic-wise MCQs in Engineering.

Onejoule is equal to

Whenever a force acts on a body and the body undergoes a displacement, then

When a particle moves along a straight path, there will be centripetal acceleration as well as tangential acceleration.

The acceleration of a particle moving with simple harmonic motion is __________ at themean position.

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

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

The total energy possessed by a system of moving bodies

The static friction

The maximum height of a projectile on a horizontal plane, is

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

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

The unit of work in S.I. units is

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 rate of doing work is known as

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

The velocity of a particle (v) moving with simple harmonic motion, at any instant is given by(where r = Amplitude of motion, and y = Displacement of the particle from mean position.)

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

Coplaner concurrent forces are those forces which

Mass moment of inertia of a thin rod about its one end is __________ the mass moment of inertia of the same rod about its mid-point

Moment of inertia of a hollow rectangular section as shown in the below figure about Y-Y axis, is not the same as that about X-X axis.

The angle of the inclined plane at which a body just begins to slide down the plane, is called helix angle.

The loss of kinetic energy due to direct impact of two bodies __________ upon the value of coefficient of restitution.

Moment of inertia of a rectangular section having width (b) and depth (d) about an axis passing through its C.G. and parallel to the width (b), is

Vectors method for the resultant force is also called polygon law of forces.

Two equal and opposite parallel forces whose lines of action are different form a couple.

When a person, on a bicycle, drives round a curve, he has to lean __________ to maintain equilibrium.

A circular hole of 50 mm diameter is cut out from a circular disc of 100 mm diameter as shown in the below figure. The centre of gravity of the section will lie

The centre of gravity of a right angled triangle lies at its geometrical centre.

The unit of power in S.I. units is

When two elastic bodies collide with each other,

The centre of gravity of a triangle lies at a point where its medians intersect each other.

The range of projectile will be maximum for a given velocity of projectile, when the angle of projection ( ) is

If the number of pulleys in a system is equal to its velocity ratio, then it is a __________ system of pulleys

In order to double the period of simple pendulum, the length of the string should be

The moment of inertia of a square of side a about its base is a4/ 3.

The law of motion involved in the recoil of gun is

When a particle moves along a circular path, its acceleration has two components, one is normal component and the other is tangential component of acceleration.

A machine which is not capable of doing any work in the reversed direction, after the effort is removed, is called a reversible machine.

The time of flight (t) of a projectile on a horizontal plane is given by

If a pendulum is taken 1 km below the earth surface in a mine, it will __________ in time.

A machine which is capable of doing work in the reversed direction, after the effort is removed, is called a non-reversible machine.

The force, by which the body is attracted, towards the centre of the earth, is called

The time taken by a particle for one complete oscillation is known as periodic time.

One joule means that

A non-reversible machine is also called a self-locking machine.

The velocity ratio of a first system of pulleys with 4 pulleys is

In actual machines, mechanical advantage is __________ velocity ratio.

If u1 and u2 are the velocities of two moving bodies in the same direction before impact and v1 and v2 are their velocities after impact, then coefficient of restitution is given by