A number of forces acting simultaneously on a particle of a body

may be replaced by a single force through C.G. of the body

may not be replaced by a single force

may be replaced by a single force

may be replaced by a single force through C.G. of the body

A heavy ladder resting on a floor and against a vertical wall may not be in equilibrium, if

floor and wall both are rough surfaces.

floor is smooth and the wall is rough

floor is rough and the wall is smooth

floor and wall both are smooth surfaces

floor and wall both are rough surfaces.

The following statement is one of the laws of Dynamic friction

The force of friction always acts in a direction opposite to that in which a body is moving

The magnitude of the kinetic friction bears a constant ratio to the normal reaction between two surfaces. The ratio being slightly less than that in the case of limiting friction

For moderate speeds the force of friction remains constant but decreases slightly with the increase of speed

The velocity of a moving body, is

a scalar as well as a vector quantity

When a body moves round a fixed axis, it has

a rotary motion and translatory motion.

P is the force acting on a body whose mass is m and acceleration is f. The equation P - mf = 0, is known as

equation of dynamic equilibrium

To double the period of oscillation of a simple pendulum

the mass of its bob should be doubled

the mass of its bob should be quadrupled

its lenght should be quadrupled

Principle of Transmissibility of Forces states that, when a force acts upon a body, its effect is

minimum if it acts at the C.G. of the body

maximum if it acts at the centre of gravity of the body

different at different points on its line of

same at every point on its line of action

minimum if it acts at the C.G. of the body

Pick up the correct statement from the following. The kinetic energy of a body

before impact is equal to that after impact

before impact is less than that after impact

before impact is more than that after impact

A particle executes a simple harmonic motion. While passing through the mean position, the particle possesses

maximum kinetic energy and maximum potential energy

maximum kinetic energy and minimum potential energy

maximum kinetic energy and maximum potential energy

minimum kinetic energy and maximum potential energy

minimum kinetic, energy and minimum potential energy

A point subjected to a number of forces will be in equilibrium, if

algebraic sum of the forces is zero

sum of resolved parts in any two directions at right angles, are both zero

algebraic sum of the forces is zero

two resolved parts in any two directions at right angles are equal

algebraic sum of the moments of the forces about the point is zero

The force acting on a point on the surface of a rigid body may be considered to act

at any point on the surface normal to the line of action of the force.

at the centre of gravity of the body

on any point on the line of action of the force

at any point on the surface normal to the line of action of the force.

Kinetic friction may be defined as

angle between normal reaction and resultant of normal reaction and limiting friction

friction force acting when the body is just about to move

friction force acting when the body is in motion

angle between normal reaction and resultant of normal reaction and limiting friction

ratio of limiting friction and normal reaction.

A ball which is thrown upwards, returns to the ground describing a parabolic path during its flight

speed of the ball remains constant

vertical component of velocity remains constant

horizontal component of velocity remains constant

speed of the ball remains constant

kinetic energy of the ball remains constant.

For a particle moving with a simple harrmonic motion, the frequency is

inversely proportional to its angular velocity

directly proportional to periodic time

inversely proportional to periodic time

inversely proportional to its angular velocity

directly proportional to its angular velocity

A Second's pendulum gains 2 minutes a day. To make it to keep correct time its length

is not changed but weight of the bob is increased

is not changed but weight of the bob is decreased

The angle of friction is :

The force of friction at which the body is just about to move.

The ratio of the friction and the normal reaction

The force of friction when the body is in motion

The angle between the normal reaction and the resultant of normal raction and limiting friction

The force of friction at which the body is just about to move.

Newtons's Law of Motion is :

Every body continues in its state of rest or of uniform motion, in a straight line, unless it is acted upon by some external force

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

To every action, there is always an equal and opposite reaction

267 + Mcqs in Applied Mechanics in Civil Engineering Page 4 McqOptions

151.	A number of forces acting simultaneously on a particle of a body
A.	may not be replaced by a single force
B.	may be replaced by a single force
C.	may be replaced by a single force through C.G. of the body
D.	may be replaced by a couple
Answer» C. may be replaced by a single force through C.G. of the body

Discussion

152.	A heavy ladder resting on a floor and against a vertical wall may not be in equilibrium, if
A.	floor is smooth and the wall is rough
B.	floor is rough and the wall is smooth
C.	floor and wall both are smooth surfaces
D.	floor and wall both are rough surfaces.
Answer» D. floor and wall both are rough surfaces.

Discussion

153.	A particle is dropped from the top of a tower 60 m high and another is projected upwards from the foot of the tower to meet the first particle at a height of 15.9 m. The velocity of projection of the second particle is
A.	16 m/sec
B.	18 m/sec
C.	20 m/sec
D.	22 m/sec.
Answer» D. 22 m/sec.

Discussion

154.	The angle of projection for a range is equal to the distance through which the particle would have fallen in order to acquire a velocity equal to the velocity of projection, will be
A.	30¬∞
B.	45¬∞
C.	60¬∞
D.	75¬∞.
Answer» E.

Discussion

155.	One end of a light string 4 m in length is fixed to a point on a smooth wall and the other end fastened to a point on the surface of a smooth sphere of diameter 2.25 m and of weight 100 kg. The tension in the string is
A.	17.5 kg
B.	19.5 kg
C.	22.5 kg
D.	25 kg.
Answer» D. 25 kg.

Discussion

156.	The instantaneous centre of a member lies at the point of intersection of two lines drawn at the ends of the member such that the lines are inclined to the direction of motion of the ends at
A.	30¬∞
B.	45¬∞
C.	60¬∞
D.	90¬∞
Answer» E.

Discussion

157.	The velocity of a body fallen from height h, on reaching the ground is given by
A.	v = 2gh
B.	v = 2gh2
C.	v = 2gh
D.	v = 1/2gh
Answer» D. v = 1/2gh

Discussion

158.	Œº is coefficient of friction. A wheeled vehicle travelling on a circular level track will slip and overturn simultaneously if the ratio of its wheel distance to the height of its centroid, is
A.	Œº
B.	2Œº
C.	3Œº
D.	Œº.
Answer» C. 3Œº

Discussion

159.	The following statement is one of the laws of Dynamic friction
A.	The force of friction always acts in a direction opposite to that in which a body is moving
B.	The magnitude of the kinetic friction bears a constant ratio to the normal reaction between two surfaces. The ratio being slightly less than that in the case of limiting friction
C.	For moderate speeds the force of friction remains constant but decreases slightly with the increase of speed
D.	all the above.
Answer» E.

Discussion

160.	The velocity of a moving body, is
A.	a vector quantity
B.	a scalar quantity
C.	a scalar as well as a vector quantity
D.	none of these.
Answer» B. a scalar quantity

Discussion

161.	When a body moves round a fixed axis, it has
A.	a rotary motion
B.	a circular motion
C.	a translatory
D.	a rotary motion and translatory motion.
Answer» C. a translatory

Discussion

162.	P is the force acting on a body whose mass is m and acceleration is f. The equation P - mf = 0, is known as
A.	equation of dynamics
B.	equation of dynamic equilibrium
C.	equation of statics
D.	none of these.
Answer» B. equation of dynamic equilibrium

Discussion

163.	To double the period of oscillation of a simple pendulum
A.	the mass of its bob should be doubled
B.	the mass of its bob should be quadrupled
C.	its lenght should be quadrupled
D.	its length should be doubled.
Answer» D. its length should be doubled.

Discussion

164.	Principle of Transmissibility of Forces states that, when a force acts upon a body, its effect is
A.	maximum if it acts at the centre of gravity of the body
B.	different at different points on its line of
C.	same at every point on its line of action
D.	minimum if it acts at the C.G. of the body
Answer» D. minimum if it acts at the C.G. of the body

Discussion

165.	The acceleration of a particle moving along the circumference of a circle with a uniform speed, is directed
A.	radially
B.	tangentially at that point
C.	away from the centre
D.	towards the centre.
Answer» C. away from the centre

Discussion

166.	The ratio of the moment of inertia of a rectangle about its centroidal axis to the moment of inertia about its base, is
A.	43556
B.	43497
C.	43558
D.	2
Answer» B. 43497

Discussion

167.	Two shots fired simultaneously from the top and bottom of a vertical tower with elevations of 30¬∞ and 45¬∞ respectively strike a target simultaneously. If horizontal distance of the target from the tower is 1000 m, the height of the tower is
A.	350 m
B.	375 m
C.	400 m
D.	425 m.
Answer» E.

Discussion

168.	From a solid cylinder of height 8 cm and radius 4 cm, a right circular cone is scooped out on the same base and having the same height as that of the cylinder. The c.g. of the remainder is at a height of
A.	4.5 cm
B.	5.0 cm
C.	5.25 cm
D.	5.5 cm.
Answer» C. 5.25 cm

Discussion

169.	The point about which combined motion of rotation and translation of a rigid body takes place, is known as
A.	Virtual centre
B.	Instantaneous centre
C.	Instantaneous axis
D.	Point of rotation
Answer» C. Instantaneous axis

Discussion

170.	A train weighing 196 tonnes experiences a frictional resistance of per tonne. The speed of the train at the top of a down gradient 1 in 78.4 is 36 km/hour. The speed of the train after running 1 km down the slope, is
A.	510 m/sec
B.	105 m/sec
C.	53 m/sec
D.	35 m/sec.
Answer» B. 105 m/sec

Discussion

171.	A rigid body suspended Vertically at a point and oscillating with a small amplitude under the action of the force of gravity, is called
A.	simple pendulum
B.	compour pendulum
C.	Second's pendulum
D.	none of these.
Answer» C. Second's pendulum

Discussion

172.	Pick up the correct statement from the following. The kinetic energy of a body
A.	before impact is equal to that after impact
B.	before impact is less than that after impact
C.	before impact is more than that after impact
D.	remains constant
Answer» D. remains constant

Discussion

173.	A particle executes a simple harmonic motion. While passing through the mean position, the particle possesses
A.	maximum kinetic energy and minimum potential energy
B.	maximum kinetic energy and maximum potential energy
C.	minimum kinetic energy and maximum potential energy
D.	minimum kinetic, energy and minimum potential energy
Answer» B. maximum kinetic energy and maximum potential energy

Discussion

174.	If two forces of 3 kg and 4 kg act at right angles to each other, their resultant force will be equal to
A.	7 kg
B.	1 kg
C.	5 kg
D.	1/7 kg
Answer» D. 1/7 kg

Discussion

175.	The equation of motion of a particle starting from rest along a straight line is x = t3 - 3l2 + 5. The ratio of the velocities after 5 sec and 3 sec will be
A.	2
B.	3
C.	4
D.	5
Answer» E.

Discussion

176.	The reaction RB of the roller support B of the beam shown in below figure is
A.	10.8 t
B.	10.6 t
C.	10.4 t
D.	10.2 t.
Answer» B. 10.6 t

Discussion

177.	M.I. of solid sphere, is
A.	2/3 Mr2
B.	2/5 Mr2
C.	Mr2
D.	œÄr4/2
Answer» D. œÄr4/2

Discussion

178.	A point subjected to a number of forces will be in equilibrium, if
A.	sum of resolved parts in any two directions at right angles, are both zero
B.	algebraic sum of the forces is zero
C.	two resolved parts in any two directions at right angles are equal
D.	algebraic sum of the moments of the forces about the point is zero
Answer» B. algebraic sum of the forces is zero

Discussion

179.	The Centre of gravity of a 10 x 15 x 5 cm T section from its bottom, is
A.	7.5 cm
B.	5.0 cm
C.	8.75 cm
D.	7.85 cm
Answer» D. 7.85 cm

Discussion

180.	The ratio of the reactions RA and RB of a simply supported beam shown in below figure is
A.	0.5
B.	0.4
C.	0.67
D.	1
Answer» E.

Discussion

181.	A 50 kg boy climbs up a 8 m rope in gymnasiam in 10 sec. The average power developed by the boy is approximately
A.	400 watts
B.	500 watts
C.	4000 watts
D.	none of these.
Answer» B. 500 watts

Discussion

182.	The force acting on a point on the surface of a rigid body may be considered to act
A.	at the centre of gravity of the body
B.	on the periphery of the body
C.	on any point on the line of action of the force
D.	at any point on the surface normal to the line of action of the force.
Answer» D. at any point on the surface normal to the line of action of the force.

Discussion

183.	From the circular plate of a diameter 6 cm is cut out a circular plate whose diameter is equal to radius of the plate. The c.g. of the remainder shifts from the original position through
A.	0.25 cm
B.	0.50 cm
C.	0.75 cm
D.	1.00 cm.
Answer» C. 0.75 cm

Discussion

184.	Time required to stop a car moving with a velocity 20 m/sec within a distance of 40 m, is
A.	2 sec
B.	3 sec
C.	4 sec
D.	5 sec
Answer» D. 5 sec

Discussion

185.	The reaction at the support B of the beam shown in below figure is
A.	1.6 t
B.	9.6 t
C.	8.5 t
D.	0.5 t.
Answer» D. 0.5 t.

Discussion

186.	Kinetic friction may be defined as
A.	friction force acting when the body is just about to move
B.	friction force acting when the body is in motion
C.	angle between normal reaction and resultant of normal reaction and limiting friction
D.	ratio of limiting friction and normal reaction.
Answer» C. angle between normal reaction and resultant of normal reaction and limiting friction

Discussion

187.	The rotational velocity of a satellite is increased by 450 m per second if its launch is done from equator
A.	eastward
B.	northward
C.	westward
D.	southward
Answer» B. northward

Discussion

188.	A ball which is thrown upwards, returns to the ground describing a parabolic path during its flight
A.	vertical component of velocity remains constant
B.	horizontal component of velocity remains constant
C.	speed of the ball remains constant
D.	kinetic energy of the ball remains constant.
Answer» C. speed of the ball remains constant

Discussion

189.	The motion of a bicycle wheel is
A.	translatory
B.	rotary
C.	rotary and translatory
D.	curvilinear
Answer» D. curvilinear

Discussion

190.	A Seconds pendulum executes
A.	0.5 beat per second
B.	1.0 beat per second
C.	2.0 beats per second
D.	2.5 beats per second
Answer» D. 2.5 beats per second

Discussion

191.	The shape of a suspended cable under its own weight, is
A.	parabolic
B.	circular
C.	catenary
D.	elliptical.
Answer» D. elliptical.

Discussion

192.	For a particle moving with a simple harrmonic motion, the frequency is
A.	directly proportional to periodic time
B.	inversely proportional to periodic time
C.	inversely proportional to its angular velocity
D.	directly proportional to its angular velocity
Answer» C. inversely proportional to its angular velocity

Discussion

193.	The direction of projection should bisect the angle between the inclined plane and the vertical for a range of a projectile on inclined plane
A.	to be zero
B.	to be maximum
C.	to be minimum
D.	none of the these.
Answer» C. to be minimum

Discussion

194.	If the linear velocity of a point on the rim of a wheel of 10 m diameter, is 50 m/sec, its angular velocity will be
A.	20 rad/sec
B.	15 rad/sec
C.	10 rad/sec
D.	5 rad/sec.
Answer» E.

Discussion

195.	A Second's pendulum gains 2 minutes a day. To make it to keep correct time its length
A.	must be decreased
B.	must be increased
C.	is not changed but weight of the bob is increased
D.	is not changed but weight of the bob is decreased
Answer» C. is not changed but weight of the bob is increased

Discussion

196.	Effect of a force on a body depends upon its
A.	direction
B.	magnitude
C.	position
D.	all the above.
Answer» E.

Discussion

197.	The angle of friction is :
A.	The ratio of the friction and the normal reaction
B.	The force of friction when the body is in motion
C.	The angle between the normal reaction and the resultant of normal raction and limiting friction
D.	The force of friction at which the body is just about to move.
Answer» D. The force of friction at which the body is just about to move.

Discussion

198.	Newtons's Law of Motion is :
A.	Every body continues in its state of rest or of uniform motion, in a straight line, unless it is acted upon by some external force
B.	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
C.	To every action, there is always an equal and opposite reaction
D.	All the above.
Answer» E.

Discussion

199.	From a circular plate of a diameter 6 cm is cut out a circle whose diameter is equal to the radius of the plate. The C.G. of the remainder from the centre of circular plate is at a distance of
A.	2.0 cm
B.	1.5 cm
C.	1
D.	0.5 cm.
Answer» E.

Discussion

200.	When a body in equilibrium undergoes an infinitely small displacement, work imagined to be done, is known as
A.	imaginary work
B.	negative work
C.	virtual work
D.	none of these.
Answer» D. none of these.

Discussion

Explore topic-wise MCQs in Civil Engineering.

A number of forces acting simultaneously on a particle of a body

A heavy ladder resting on a floor and against a vertical wall may not be in equilibrium, if

A particle is dropped from the top of a tower 60 m high and another is projected upwards from the foot of the tower to meet the first particle at a height of 15.9 m. The velocity of projection of the second particle is

The angle of projection for a range is equal to the distance through which the particle would have fallen in order to acquire a velocity equal to the velocity of projection, will be

One end of a light string 4 m in length is fixed to a point on a smooth wall and the other end fastened to a point on the surface of a smooth sphere of diameter 2.25 m and of weight 100 kg. The tension in the string is

The instantaneous centre of a member lies at the point of intersection of two lines drawn at the ends of the member such that the lines are inclined to the direction of motion of the ends at

The velocity of a body fallen from height h, on reaching the ground is given by

Œº is coefficient of friction. A wheeled vehicle travelling on a circular level track will slip and overturn simultaneously if the ratio of its wheel distance to the height of its centroid, is

The following statement is one of the laws of Dynamic friction

The velocity of a moving body, is

When a body moves round a fixed axis, it has

P is the force acting on a body whose mass is m and acceleration is f. The equation P - mf = 0, is known as

To double the period of oscillation of a simple pendulum

Principle of Transmissibility of Forces states that, when a force acts upon a body, its effect is

The acceleration of a particle moving along the circumference of a circle with a uniform speed, is directed

The ratio of the moment of inertia of a rectangle about its centroidal axis to the moment of inertia about its base, is

Two shots fired simultaneously from the top and bottom of a vertical tower with elevations of 30¬∞ and 45¬∞ respectively strike a target simultaneously. If horizontal distance of the target from the tower is 1000 m, the height of the tower is

From a solid cylinder of height 8 cm and radius 4 cm, a right circular cone is scooped out on the same base and having the same height as that of the cylinder. The c.g. of the remainder is at a height of

The point about which combined motion of rotation and translation of a rigid body takes place, is known as

A train weighing 196 tonnes experiences a frictional resistance of per tonne. The speed of the train at the top of a down gradient 1 in 78.4 is 36 km/hour. The speed of the train after running 1 km down the slope, is

A rigid body suspended Vertically at a point and oscillating with a small amplitude under the action of the force of gravity, is called

Pick up the correct statement from the following. The kinetic energy of a body

A particle executes a simple harmonic motion. While passing through the mean position, the particle possesses

If two forces of 3 kg and 4 kg act at right angles to each other, their resultant force will be equal to

The equation of motion of a particle starting from rest along a straight line is x = t3 - 3l2 + 5. The ratio of the velocities after 5 sec and 3 sec will be

The reaction RB of the roller support B of the beam shown in below figure is

M.I. of solid sphere, is

A point subjected to a number of forces will be in equilibrium, if

The Centre of gravity of a 10 x 15 x 5 cm T section from its bottom, is

The ratio of the reactions RA and RB of a simply supported beam shown in below figure is

A 50 kg boy climbs up a 8 m rope in gymnasiam in 10 sec. The average power developed by the boy is approximately

The force acting on a point on the surface of a rigid body may be considered to act

From the circular plate of a diameter 6 cm is cut out a circular plate whose diameter is equal to radius of the plate. The c.g. of the remainder shifts from the original position through

Time required to stop a car moving with a velocity 20 m/sec within a distance of 40 m, is

The reaction at the support B of the beam shown in below figure is

Kinetic friction may be defined as

The rotational velocity of a satellite is increased by 450 m per second if its launch is done from equator

A ball which is thrown upwards, returns to the ground describing a parabolic path during its flight

The motion of a bicycle wheel is

A Seconds pendulum executes

The shape of a suspended cable under its own weight, is

For a particle moving with a simple harrmonic motion, the frequency is

The direction of projection should bisect the angle between the inclined plane and the vertical for a range of a projectile on inclined plane

If the linear velocity of a point on the rim of a wheel of 10 m diameter, is 50 m/sec, its angular velocity will be

A Second's pendulum gains 2 minutes a day. To make it to keep correct time its length

Effect of a force on a body depends upon its

The angle of friction is :

Newtons's Law of Motion is :

From a circular plate of a diameter 6 cm is cut out a circle whose diameter is equal to the radius of the plate. The C.G. of the remainder from the centre of circular plate is at a distance of

When a body in equilibrium undergoes an infinitely small displacement, work imagined to be done, is known as