Mechanical Engineering : Engineering Mechanics MCQs with Answers

1 .
What is Engineering Mechanics?
A)  Study of bodies only under rest
B)  Study of bodies only under motion
C)  Study of bodies under motion without considering forces
D)  Application of mechanics to issues involving common engineering aspects

Correct Answer :   Application of mechanics to issues involving common engineering aspects

Explanation : The application of mechanics to issues involving common engineering aspects is known as engineering mechanics. The purpose of the Engineering Mechanics course is to expose students to mechanics problems as they are applied to realistic circumstances.

2 .
What is Mechanics?
A)  Branch of science which deals with failure analysis
B)  Branch of science which deals with the study of bodies only under rest
C)  Branch of science which deals with conditions of rest or motion of bodies
D)  Branch of science which deals with the study of bodies only under motion

Correct Answer :   Branch of science which deals with conditions of rest or motion of bodies

Explanation : The branch of physics that deals with how the action of force affects material bodies or the functional aspects of activity are known as mechanics. The distance takes an automobile traveling at 30 mph to come to a complete stop is an illustration of mechanics.

3 .
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)  Both (A) and (B)
D)  None of the above

Correct Answer :   Both (A) and (B)

4 .
One watt is equal to
A)  0.1 joule/s
B)  1 joule/s
C)  10 joules/s
D)  100 joules/s

Correct Answer :   1 joule/s

5 .
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)  15 N and 15 N
C)  20 N and 5 N
D)  None of the above

Correct Answer :   15 N and 5 N

6 .
Which of the following statement is correct?
A)  The algebraic sum of the forces, constituting the couple is zero.
A)  
B)  The algebraic sum of the forces, constituting the couple, about any point is the same.
B)  
C)  A couple cannot be balanced by a single force but can be balanced only by a couple of opposite sense.
C)  
D)  All of the above
D)  

Correct Answer :   All of the above

7 .
The velocity ratio of a differential wheel and axle with D as the diameter of effort wheel and d₁,and d₂ as the diameters of larger and smaller axles respectively, is
A)  D/d₁ + d₂
A)  
B)  D/d₁ - d₂
B)  
C)  2D/d₁ + d₂
C)  
D)  2D/d₁ - d₂
D)  

Correct Answer :   2D/d₁ - d₂

8 .
The time of flight of a projectile on downward inclined plane depends upon
A)  Angle of projection
B)  Angle of inclination of the plane
C)  Both (A) and (B)
D)  None of the above

Correct Answer :   Both (A) and (B)

9 .
The force induced in the string BC due to the load W as shown in the below figure is
A)  W cot θ
A)  
B)  W tan θ
B)  
C)  W cos θ
C)  
D)  W sin θ
D)  

Correct Answer :   W cot θ

10 .
The wheels of a moving car possess
A)  potential energy only
B)  kinetic energy of rotation only
C)  kinetic energy of translation only
D)  kinetic energy of translation and rotation both

Correct Answer :   kinetic energy of translation and rotation both

11 .
The acceleration of a particle moving with simple harmonic motion, at any instant is given by
A)  ω.y
B)  ω².y
C)  ω² /y
D)  ω³.y

Correct Answer :   ω².y

12 .
The skidding away of the vehicle on a level circular path can be avoided if the force of friction between the wheels and the ground is __________ the centrifugal force.
A)  less than
B)  greater than
C)  Both (A) and (B)
D)  None of the above

Correct Answer :   greater than

13 .
In order to determine the effects of a force, acting on a body, we must know
A)  magnitude of the force
B)  line of action of the force
C)  nature of the force i,e. whether the force is push or pull
D)  All of the above

Correct Answer :   All of the above

14 .
If the efficiency of a lifting machine is kept constant, its velocity ratio is __________ propotional to its mechanical advantage.
A)  directly
B)  inversely
C)  Both (A) and (B)
D)  None of the above

Correct Answer :   directly

15 .
Non-coplaner non-concurrent forces are those forces which
A)  do not meet at one point but their lines of action lie on the same plane
B)  meet at one point, but their lines of action do not lie on the same plane
C)  do not meet at one point and their lines of action do not lie on the same plane
D)  None of the above

Correct Answer :   do not meet at one point and their lines of action do not lie on the same plane

16 .
The forces which meet at one point, but their lines of action __________ on the same plane, are Known as non-coplaner concurrent forces.
A)  lie
B)  do not lie
C)  Both (A) and (B)
D)  None of the above

Correct Answer :   do not lie

17 .
A machine having an efficiency less than 50%, is known as
A)  ideal machine
B)  reversible machine
C)  non-reversible machine
D)  neither reversible nor non-reversible machine

Correct Answer :   non-reversible machine

18 .
The total momentum of a system of masses (i. e. moving bodies) in any one direction remains constant, unless acted upon by an external force in that direction. This statement is called
A)  Newton's first law of motion
A)  
B)  Newton's second law of motion
B)  
C)  principle of conservation of energy
C)  
D)  principle of conservation of momentum
D)  

Correct Answer :   principle of conservation of momentum

19 .
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
A)  
B)  twice the area of the triangle
B)  
C)  half the area of the triangle
C)  
D)  None of the above
D)  

Correct Answer :   twice the area of the triangle

20 .
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)  g/2
B)  g/3
C)  g/4
D)  None of the above

Correct Answer :   None of the above

21 .
The forces, 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

Correct Answer :   coplaner concurrent forces

22 .
The velocity ratio for the third system of pulleys is
A)  n
A)  
B)  n2
B)  
C)  2n
C)  
D)  2n - 1
D)  

Correct Answer :   2n - 1

23 .
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
A)  
B)  half
B)  
C)  double
C)  
D)  None of the above
D)  

Correct Answer :   same

24 .
A smooth cylinder lying on a __________ is in neutral equilibrium.
A)  curved surface
B)  convex surface
C)  horizontal surface
D)  None of the above

Correct Answer :   horizontal surface

25 .
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.

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

26 .
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
A)  
B)  decrease
B)  
C)  Not be effected
C)  
D)  None of the above
D)  

Correct Answer :   increase

27 .
Which of the following is a branch of mechanics?
A)  Statics and kinetics
B)  Statics and dynamics
C)  Kinematics and dynamics
D)  Kinetics and kinematics

Correct Answer :   Statics and dynamics

Explanation : There are two branches of mechanics they are statics and dynamics. Statics deals with the study of bodies at rest. Dynamics deals with the study of bodies under motion.

28 .
Which of the following is the basic law for mechanics?
A)  Hooke’s law
B)  Parallelogram law
C)  Newton’s laws of motion
D)  Newton’s law of viscosity

Correct Answer :   Newton’s laws of motion

Explanation : The fundamental law for engineering mechanics is Newton’s laws of motion. Newton’s first law, second law, and third law are widely used to solve issues involving mechanical aspects.

29 .
Which of the following is termed as an action of pull or push of a body at rest or motion?
A)  Force
B)  Work
C)  Torque
D)  Momentum

Correct Answer :   Force

Explanation : The pull or push of a body at rest or motion is termed as a force. When an external agent acts on a body, it moves. This external agent is force.

30 .
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
A)  compound pendulum
B)  simple pendulum
C)  second's pendulum
D)  torsional pendulum

Correct Answer :   compound pendulum

31 .
Moment of inertia of a hollow circular section, as shown in the below figure about X-axis, is
A)  π/64 (d⁴-d⁴)
A)  
B)  π/32 (d⁴-d⁴)
B)  
C)  π/16 (d³-d³)
C)  
D)  π/16 (d²-d²)
D)  

Correct Answer :   π/64 (d⁴-d⁴)

32 .
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
A)  
B)  Disagree
B)  
C)  Both (A) and (B)
C)  
D)  None of the above
D)  

Correct Answer :   Agree

33 .
During elastic impact, the relative velocity of the two bodies after impact is ________ the relative velocity of the two bodies before impact.
A)  equal to
B)  less than
C)  greater than
D)  equal and opposite to

Correct Answer :   equal and opposite to

34 .
The angle between two forces when the resultant is maximum and minimum respectively are
A)  90° and 0°
B)  90° and 180°
C)  0° and 180°
D)  180° and 0°

Correct Answer :   0° and 180°

35 .
A redundant frame is also called __________ frame.
A)  perfect
B)  imperfect
C)  deficient
D)  None of the above

Correct Answer :   imperfect

36 .
Two equal and opposite parallel forces whose lines of action are different, can be replaced by a single force parallel to the given forces.
A)  Correct
B)  Incorrect
C)  None of the above
D)  --

Correct Answer :   Incorrect

37 .
When a body of mass moment of inertia I (about a given axis) is rotated about that axis with an angular velocity to, then the kinetic energy of rotation is
A)  ⁄ω
B)  ⁄ω²
C)  0.5 ⁄ω
D)  0.5 ⁄ω²

Correct Answer :   0.5 ⁄ω²

38 .
The force applied on a body of mass 100 kg to produce an acceleration of 5 m/s², is
A)  500N
B)  100N
C)  20N
D)  None of the above

Correct Answer :   500N

39 .
The motion of the body from one extremity to the other is known as a beat.
A)  Agree
B)  Disagree
C)  Both (A) and (B)
D)  None of the above

Correct Answer :   Agree

40 .
A framed structure is perfect, if the number of members are __________ (2j - 3), where j is the number of joints.
A)  less than
B)  equal to
C)  greater than
D)  Either (A) or (C)

Correct Answer :   equal to

41 .
A screw jack used for lifting the loads is
A)  an ideal machine
B)  a reversible machine
C)  a non-reversible machine
D)  None of the above

Correct Answer :   a non-reversible machine

42 .
The kinetic energy of a body __________ upon its mass and velocity.
A)  depends
B)  does not depend
C)  Both (A) and (B)
D)  None of the above

Correct Answer :   depends

43 .
According to Newton's first law of motion,
A)  to every action, there is always an equal and opposite reaction
B)  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
C)  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
D)  None of the above

Correct Answer :   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

44 .
The moment of inertia of a square of side (a) about an axis through its centre of gravity is
A)  a⁴/4
B)  a⁴/8
C)  a⁴/12
D)  a⁴/36

Correct Answer :   a⁴/12

45 .
The motion of a wheel of a car is
A)  purely rotational
B)  purely translation
C)  combined translation and rotational
D)  None of the above

Correct Answer :   combined translation and rotational

46 .
The velocity ratio of a single purchase crab winch can be increased by
A)  increasing the length of the handle
B)  increasing the radius of the load drum
C)  increasing the number of teeth of the pinion
D)  All of the above

Correct Answer :   increasing the length of the handle

47 .
Concurrent forces are those forces whose lines of action
A)  lie on the same line
B)  meet at one point
C)  meet on the same plane
D)  None of the above

Correct Answer :   meet at one point

48 .
Tension in the cable supporting a lift is more when the lift is moving ________ with an acceleration.
A)  upwards
B)  downwards
C)  Both (A) and (B)
D)  None of the above

Correct Answer :   upwards

49 .
Which of the following statement is correct?
A)  The kinetic energy of a body during impact remains constant.
A)  
B)  The kinetic energy of a body before impact is equal to the kinetic energy of a body after impact.
B)  
C)  The kinetic energy of a body before impact is less than the kinetic energy of a body after impact.
C)  
D)  The kinetic energy of a body before impact is more than the kinetic energy of a body after impact.
D)  

Correct Answer :   The kinetic energy of a body before impact is more than the kinetic energy of a body after impact.

50 .
Moment of inertia of a triangular section of base (b) and height (h) about an axis through its base, is
A)  bh³/4
B)  bh³/8
C)  bh³/ 12
D)  bh³/ 36

Correct Answer :   bh³/ 12

51 .
Which of the following are vector quantities?
A)  Linear velocity
B)  Linear displacement
C)  Linear acceleration
D)  All of the above

Correct Answer :   All of the above

52 .
The maximum acceleration of a particle moving with simple harmonic motion is
A)  ω
B)  ωr
C)  ω²r
D)  ω/r

Correct Answer :   ω²r

53 .
Non-coplaner concurrent forces are those forces which
A)  meet at one point and their lines of action also lie on the same plane
B)  meet at one point, but their lines of action do not lie on the same plane
C)  do not meet at one point, but their lines of action lie on the same plane
D)  do not meet at one point and their lines of action do not lie on the same plane

Correct Answer :   meet at one point, but their lines of action do not lie on the same plane

54 .
The principle of transmissibility of forces states that, when a force acts upon a body, its effect is
A)  minimum, if it acts at the centre of gravity of the body
B)  same at every point on its line of action
C)  maximum, if it acts at the centre of gravity of the body
D)  different at different points on its line of action

Correct Answer :   minimum, if it acts at the centre of gravity of the body

55 .
A differential pulley block has larger and smaller diameters of 100 mm and 80 mm respectively. Its velocity ratio is
A)  5
B)  10
C)  15
D)  20

Correct Answer :   10

56 .
Newton's second law motion ______ a relation between force and mass of a moving body.
A)  gives
B)  does not give
C)  Both (A) and (B)
D)  None of the above

Correct Answer :   gives

57 .
The moment of inertia of a thin spherical shell of mass m and radius r, about its diameter is
A)  3mr²/5
B)  2mr²/5
C)  2mr²/3
D)  mr²/3

Correct Answer :   2mr²/3

58 .
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
A)  P + Q
A)  
B)  P - Q
B)  
C)  P / Q
C)  
D)  Q / P
D)  

Correct Answer :   P - Q

59 .
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 the above

Correct Answer :   Newton's third law of motion

60 .
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
C)  None of the above
D)  --

Correct Answer :   True

61 .
The range of projectile will be maximum for a given velocity of projectile, when the angle of projection (α) is
A)  β/2
B)  30° + β/2
C)  45° + β/2
D)  60° + β/2

Correct Answer :   45° + β/2

62 .
When two elastic bodies collide with each other,
A)  the two bodies begin to regain their original shape
B)  the two bodies will momentarily come to rest after collision
C)  the two bodies tend to compress and deform at the surface of contact
D)  All of the above

Correct Answer :   All of the above

63 .
In order to double the period of simple pendulum, the length of the string should be
A)  halved
B)  quadrupled
C)  doubled
D)  None of the above

Correct Answer :   quadrupled

64 .
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
D)  None of the above

Correct Answer :   second

65 .
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

Correct Answer :   All of the above

66 .
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

Correct Answer :   100

67 .
The total motion possessed by a body, is called
A)  mass
B)  weight
C)  momentum
D)  impulsive force

Correct Answer :   momentum

68 .
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
A)  
B)  the change in momentum suffered by rubber ball is more than the lead ball
B)  
C)  the change in momentum suffered by rubber ball is less than the lead ball
C)  
D)  None of the above
D)  

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

69 .
If P is the force acting on the body, m is the mass of the body and a is the acceleration of the body, then according to Newton's second law of motion,
A)  P - m.a = 0
B)  P/m.a = 0
C)  P + m.a = 0
D)  P x m.a = 0

Correct Answer :   P - m.a = 0

70 .
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

Correct Answer :   static friction

71 .
The moment of inertia of a solid sphere of mass m and radius r is
A)  mr²
B)  mr²/2
C)  2mr²/3
D)  2mr²/5

Correct Answer :   2mr²/5

72 .
The matter contained in a body, is called
A)  weight
B)  mass
C)  momentum
D)  impulsive force

Correct Answer :   mass

73 .
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)  less than
B)  greater than
C)  equal to
D)  None of the above

Correct Answer :   equal to

74 .
Which of the following statement is correct?
A)  The velocity of the particle moving with simple harmonic motion is zero at the mean position.
A)  
B)  The acceleration of the particle moving with simple harmonic motion is maximum at the mean position.
B)  
C)  The periodic time of a particle moving with simple harmonic motion is directly proportional to its angular velocity.
C)  
D)  The periodic time of a particle moving with simple harmonic motion is the time taken by a particle for one complete oscillation,
D)  

Correct Answer :   The periodic time of a particle moving with simple harmonic motion is the time taken by a particle for one complete oscillation,

75 .
The law of the machine is(where P = Effort applied to lift the load, m = A constant which is equal to the slope of the line, W = Load lifted, and C = Another constant which represents the machine friction.)
A)  P = mW + C
A)  
B)  P = C - mW
B)  
C)  P = mW - C
C)  
D)  P = m/W + C
D)  

Correct Answer :   P = mW + C

76 .
In a framed structure, as shown in the below figure, the force in the member AB is __________ the force in member AC.
A)  half
A)  
B)  double
B)  
C)  equal to
C)  
D)  None of the above
D)  

Correct Answer :   half

77 .
The moment of the force P about O as shown in the below figure is
A)  P x OA
A)  
B)  P x OB
B)  
C)  P x OC
C)  
D)  P x AC
D)  

Correct Answer :   P x OC

78 .
In actual machines, mechanical advantage is __________ velocity ratio.
A)  equal to
B)  less than
C)  greater than
D)  None of the above

Correct Answer :   less than

79 .
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

Correct Answer :   2m

80 .
When the spring of a watch is wound, it will possess
A)  strain energy
B)  heat energy
C)  kinetic energy
D)  electrical energy

Correct Answer :   strain energy

81 .
The rate of doing work is known as
A)  power
B)  kinetic energy
C)  potential energy
D)  None of the above

Correct Answer :   power

82 .
Moment of inertia of a circular section about its diameter (d) is
A)  πd³/16
B)  πd³/32
C)  πd⁴/32
D)  πd⁴/64

Correct Answer :   πd⁴/64

83 .
In a screw jack, the effort required to lower the load is __________ the effort required to raise the same load.
A)  less than
B)  equal to
C)  more than
D)  None of the above

Correct Answer :   less than

84 .
The centre of gravity of an equilateral triangle with each side a, is __________ from any of the three sides.
A)  2√3a
B)  3√2a
C)  a/2√3
D)  √3a/2

Correct Answer :   a/2√3

85 .
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 the above

Correct Answer :   principle of resolution of forces

86 .
The mechanical advantage of a lifting machine is the ratio of
A)  output to the input
B)  load lifted to the effort applied
C)  distance moved by effort to the distance moved by load
D)  All of the above

Correct Answer :   load lifted to the effort applied

87 .
Static friction is always __________ dynamic friction.
A)  less than
B)  equal to
C)  greater than
D)  None of the above

Correct Answer :   less than

88 .
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)  None of the above

Correct Answer :   greater than

89 .
The bodies which rebound after impact are called
A)  elastic bodies
B)  inelastic bodies
C)  neither elastic nor inelastic bodies
D)  None of the above

Correct Answer :   elastic bodies

90 .
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)  None of the above

Correct Answer :   equal to

91 .
The range of a projectile is maximum, when the angle of projection is
A)  30°
B)  45°
C)  60°
D)  90°

Correct Answer :   45°

92 .
For any system of coplaner forces, the condition of equilibrium is that the
A)  algebraic sum of the vertical components of all the forces should be zero
B)  algebraic sum of moments of all the forces about any point should be zero
C)  algebraic sum of the horizontal components of all the forces should be zero
D)  All of the above

Correct Answer :   All of the above

93 .
The ratio of static friction to dynamic friction is always
A)  equal to one
B)  less than one
C)  greater than one
D)  None of the above

Correct Answer :   greater than one

94 .
One kg force is equal to______.
A)  12 N
B)  9.8 N
C)  8.9 N
D)  7.8 N

Correct Answer :   9.8 N

95 .
Coefficient of friction depends upon
A)  area of contact only
B)  nature of surface only
C)  Both (A) and (B)
D)  None of the above

Correct Answer :   nature of surface only

96 .
When a body of mass m attains a velocity v from rest in time t, then the kinetic energy of translation is
A)  mv²
B)  mgv²
C)  0.5 mv²
D)  0.5 mgv²

Correct Answer :   0.5 mv²

97 .
In a framed structure, as shown in the below figure, the forces in the members AB and BC are respectively
A)  √3 w (tensile) and 2W (compressive)
A)  
B)  2W(tensile) and √3 w (compressive)
B)  
C)  2√3 w (tensile) and 2√3 w (compressive)
C)  
D)  None of the above
D)  

Correct Answer :   √3 w (tensile) and 2W (compressive)

98 .
The unit of moment of inertia of an area is
A)  m⁴
B)  kg-m²
C)  kg/m²
D)  kg-m-s²

Correct Answer :   m⁴

99 .
A pendulum which executes one beat per second is known as
A)  simple pendulum
B)  compound pendulum
C)  torsional pendulum
D)  second's pendulum

Correct Answer :   second's pendulum

100 .
The forces, whose lines of action are parallel to each other and act in the same directions, are known as
A)  coplaner concurrent forces
B)  unlike parallel forces
C)  like parallel forces
D)  coplaner non-concurrent forces

Correct Answer :   like parallel forces

101 .
The centre of gravity of a semi-circle lies at a distance of __________ from its base measured along the vertical radius.
A)  8r/3
B)  3r/ 8
C)  3r/4π
D)  4r/ 3π

Correct Answer :   4r/ 3π

102 .
A weight of 1000 N can be lifted by an effort of 80 N. If the velocity ratio is 20, the machine is
A)  ideal
B)  reversible
C)  non-reversible
D)  None of the above

Correct Answer :   reversible

103 .
In a framed structure, as shown in the below figure, the force in the member BC is
A)  W/√3 (tension)
A)  
B)  2W/√3 (tension)
B)  
C)  W/√3 (compression)
C)  
D)  2W/√3 (compression)
D)  

Correct Answer :   2W/√3 (tension)

104 .
The potential energy of a vertically raised body is __________ the kinetic energy of a vertically falling body.
A)  equal to
B)  less than
C)  greater than
D)  None of the above

Correct Answer :   equal to

105 .
In ideal machines, mechanical advantage is __________ velocity ratio.
A)  equal to
B)  less than
C)  greater than
D)  None of the above

Correct Answer :   equal to

106 .
The minimum force required to slide a body of weight W on a rough horizontal plane is
A)  W sin θ
B)  W cos θ
C)  W tan θ
D)  None of the above

Correct Answer :   W tan θ

107 .
The moment of inertia of a square of side a about its diagonal is
A)  a⁴/16
B)  a⁴/12
C)  a³/12
D)  a²/8

Correct Answer :   a⁴/12

108 .
The angular velocity (in rad / s) of a body rotating at N revolutions per minute is
A)  πN/60
B)  2πN/60
C)  πN/180
D)  2πN/180

Correct Answer :   2πN/60

109 .
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)  at O
A)  
B)  in the hole
B)  
C)  in the shaded area
C)  
D)  None of the above
D)  

Correct Answer :   in the shaded area

110 .
The maximum velocity of a particle moving with simple harmonic motion is
A)  ωr
B)  ω
C)  ω/r
D)  ω²r

Correct Answer :   ωr

111 .
A body of mass m moving with a constant velocity v strikes another body of same mass m moving with same velocity but in opposite direction. The common velocity of both the bodies after collision is
A)  v
A)  
B)  2v
B)  
C)  4v
C)  
D)  8v
D)  

Correct Answer :   2v

112 .
The unit of power in S.I. units is
A)  kg-m
B)  joule
C)  watt
D)  horsepower

Correct Answer :   watt

113 .
The resultant of two equal forces P making an angle θ, is given by
A)  2 P cot θ /2
B)  2 P tan θ /2
C)  2 P sin θ /2
D)  2 P cos θ /2

Correct Answer :   2 P cos θ /2

114 .
The force, by which the body is attracted, towards the centre of the earth, is called
A)  mass
B)  weight
C)  momentum
D)  impulsive force

Correct Answer :   weight

115 .
Coplaner concurrent forces are those forces which
A)  meet at one point and their lines of action also lie on the same plane
B)  meet at one point, but their lines of action do not lie on the same plane
C)  do not meet at one point, but their lines of action lie on the same plane
D)  do not meet at one point and their lines of action do not lie on the same plane

Correct Answer :   meet at one point and their lines of action also lie on the same plane

116 .
The power developed by a body acted upon by a torque T newton metre (N - m) and revolving at ω radian/s is given by
A)  T.ω (in watts)
B)  T.ω/60 (in watts)
C)  T.ω/75 (in kilowatts)
D)  T.ω/4500 (in kilowatts)

Correct Answer :   T.ω (in watts)

117 .
The velocity ratio of a first system of pulleys with 4 pulleys is
A)  4
B)  8
C)  16
D)  20

Correct Answer :   16

118 .
One joule means that
A)  work is done by a force of 1 kg when it displaces a body through 1 m
B)  work is done by a force of 1 g when it displaces a body through 1 cm
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 N when it displaces a body through 1m

Correct Answer :   work is done by a force of 1 N when it displaces a body through 1m

119 .
The moment of inertia of a sphere of mass m and radius r, about an axis tangential to it, is
A)  2mr²/3
B)  2mr²/5
C)  7mr²/3
D)  7mr²/5

Correct Answer :   7mr²/5

120 .
The velocity ratio for the first system of pulleys is(where n is the number of pulleys.)
A)  n
A)  
B)  n<sup>2</sup>
B)  
C)  2<sup>n</sup>
C)  
D)  2<sup>n</sup> - 1
D)  

Correct Answer :   2<sup>n</sup>

121 .
The ideal angle of banking provided on the curves on roads depends upon
A)  weight of the vehicle
B)  (velocity)² of the vehicle
C)  nature of the road surface
D)  coefficient of friction between the road and vehicle contact point

Correct Answer :   (velocity)² of the vehicle

122 .
The moment of inertia of a thin disc of mass m and radius r, about an axis through its centre of gravity and perpendicular to the plane of the disc is
A)  mr²/2
B)  mr²/4
C)  mr²/6
D)  mr²/8

Correct Answer :   mr²/2

123 .
The linear velocity of a body rotating at ω rad / s along a circular path of radius r is given by
A)  ω/r
B)  ω.r
C)  ω²/r
D)  ω².r

Correct Answer :   ω.r

124 .
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

Correct Answer :   four times

125 .
The centre of gravity of a quadrant of a circle lies along its central radius (r) at a distance of
A)  0.8r
B)  0.7r
C)  0.6r
D)  0.5r

Correct Answer :   0.6r

126 .
The maximum mechanical advantage of a lifting machine is
A)  m
B)  1 / m
C)  1 - m
D)  1 + m

Correct Answer :   1 / m

127 .
A machine having an efficiency greater than 50%, is known as
A)  reversible machine
B)  ideal machine
C)  non-reversible machine
D)  neither reversible nor non-reversible machine

Correct Answer :   reversible machine

128 .
Moment of inertia of a triangular section of base (b) and height (h) 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
A)  
B)  six times
B)  
C)  four times
C)  
D)  two times
D)  

Correct Answer :   nine times

129 .
An ideal machine is one whose efficiency is
A)  100%
B)  between 80 and 90%
C)  between 70 and 80%
D)  between 60 and 70%

Correct Answer :   100%

130 .
The energy possessed by a body, for doing work by virtue of its position, is called
A)  kinetic energy
B)  chemical energy
C)  electrical energy
D)  potential energy

Correct Answer :   potential energy

131 .
The acceleration of a particle moving with simple harmonic motion is __________ at themean position.
A)  zero
B)  minimum
C)  maximum
D)  None of the above

Correct Answer :   zero

132 .
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)

Correct Answer :   either (B) or (C)

133 .
The linear acceleration (a) of a body rotating along a circular path of radius (r) with an angular acceleration of α rad / s², is
A)  a = α/ r
B)  a = α.r
C)  a = r / α
D)  None of the above

Correct Answer :   a = α.r

134 .
The total energy possessed by a system of moving bodies
A)  varies from point to point
B)  is maximum in the start and minimum at the end
C)  is constant at every instant
D)  is minimum in the start and maximum at the end

Correct Answer :   is constant at every instant

135 .
The moment of inertia of a solid cylinder of mass m, radius r and length l about the longitudinal axis or polar axis is
A)  mr²/2
B)  mr²/4
C)  mr²/6
D)  mr²/8

Correct Answer :   mr²/2

136 .
In a screw jack, the effort required to lift the load is given by(where W = Load lifted, α = Helix angle, and φ = Angle of friction.)
A)  P = W cos (α + φ)
B)  P = W tan (α - φ)
C)  P = W tan (α + φ)
D)  P = W tan (φ - α)

Correct Answer :   P = W tan (α + φ)

137 .
For a self locking machine, the efficiency must be
A)  less than 50%
B)  equal to 50%
C)  greater than 50%
D)  100%

Correct Answer :   less than 50%

138 .
According to which of the following laws of mechanics a body remains/continue in its state of rest or motion until it is disturbed by an external agent?
A)  Superposition law
B)  Newton’s first law of motion
C)  Newton’s second law of motion
D)  Newton’s third law of motion

Correct Answer :   Newton’s first law of motion

Explanation : Newton’s first law asserts that if a body is at rest or moving in a straight path at a constant speed, it will remain at rest or continue to move in a straight line at a constant speed until acted upon by a force.

139 .
Which of the following is the characteristic of force?
A)  Magnitude of force
B)  Point of application of force
C)  Direction of application of force
D)  All of the above

Correct Answer :   All of the above

Explanation : Three important quantities that define force are :

i) The magnitude of the force
ii) The direction of application of force
iii) Point of application of force

140 .
When can two forces be in equilibrium?
A)  They are collinear
B)  They are equal in magnitude
C)  They are opposite in direction
D)  All of the above

Correct Answer :   All of the above

Explanation : Two forces are said to be in equilibrium only if the forces are equal in magnitude, opposite in direction, and are collinear. This is equilibrium law.

141 .
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)  bh³/4
B)  bh³/8
C)  bh³/12
D)  bh³/36

Correct Answer :   bh³/36

142 .
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
A)  
B)  v² = u²+2a.s
B)  
C)  s = u.t + 1/2 a.t²
C)  
D)  All of the above
D)  

Correct Answer :   All of the above

143 .
A smooth cylinder lying on its convex surface remains in __________ equilibrium.
A)  stable
B)  unstable
C)  neutral
D)  None of the above

Correct Answer :   unstable

144 .
Moment of inertia of a circular section about an axis perpendicular to the section is
A)  πd⁴/32
B)  πd³/32
C)  πd³/16
D)  πd⁴/64

Correct Answer :   πd⁴/32

145 .
The unit of angular acceleration is
A)  N-m
B)  m/s
C)  rad/s²
D)  m/s²

Correct Answer :   rad/s²

146 .
A ladder is resting on a smooth ground and leaning against a rough vertical wall. The force of friction will act
A)  downward at its upper end
B)  upward at its upper end
C)  towards the wall at its upper and
D)  away from the wall at its upper end

Correct Answer :   upward at its upper end

147 .
The length of a second's pendulum is
A)  101cm
B)  100cm
C)  94.9cm
D)  99.4cm

Correct Answer :   99.4cm

148 .
The slope on the road surface generally provided on the curves is known as
A)  angle of repose
B)  angle of friction
C)  angle of banking
D)  None of the above

Correct Answer :   angle of banking

149 .
The moment of inertia of a rectangular section 3cm wide and 4cm deep about X-X axis is
A)  9cm⁴
B)  12cm⁴
C)  16cm⁴
D)  20cm⁴

Correct Answer :   16cm⁴

150 .
Joule is the unit of
A)  work
B)  force
C)  power
D)  velocity

Correct Answer :   work

151 .
A spherical body is symmetrical about its perpendicular axis. According to Routh's rule, the moment of inertia of a body about an axis passing through its centre of gravity is(where, M = Mass of the body, and S = Sum of the squares of the two semi-axes.)
A)  MS/3
A)  
B)  MS/4
B)  
C)  MS/5
C)  
D)  None of the above
D)  

Correct Answer :   MS/5

152 .
The three forces of 100 N, 200 N and 300 N have their lines of action parallel to each other but act in the opposite directions. These forces are known as
A)  like parallel forces
A)  
B)  unlike parallel forces
B)  
C)  coplaner concurrent forces
C)  
D)  coplaner non-concurrent forces
D)  

Correct Answer :   unlike parallel forces

153 .
The efficiency of a lifting machine is the ratio of
A)  output to the input
B)  mechanical advantage to the velocity ratio
C)  work done by the machine to the work done on the machine
D)  All of the above

Correct Answer :   All of the above

154 .
The maximum efficiency of a lifting machine is
A)  1/m
B)  m/V.R.
C)  V.R./m
D)  1/(m x V.R.)

Correct Answer :   1/(m x V.R.)

155 .
Which of the following statements describes the resultant of two forces?
A)  Force that has the same effect as one force
B)  Force that has the same effect as the two forces
C)  Force that maintains the system in equilibrium
D)  Force that has the highest magnitude in the system

Correct Answer :   Force that has the same effect as the two forces

Explanation : When two forces act on a body, the resultant of those two forces is taken into account. The effect of the resulting force is the same as the effect of the two forces. The force that has the same impact as the two forces is known as the resultant of two forces.

156 .
The point of application where the total weight can be expected to be concentrated if the gravitational force is dispersed across the volume of the body is called ______
A)  Moment of inertia
B)  The surface of the body
C)  Center of gravity of the body
D)  The centroid of the body

Correct Answer :   Center of gravity of the body

Explanation : The centre of gravity of the body is the point of application where the complete weight of the body is thought to be concentrated.

157 .
What is a free-body diagram?
A)  It’s a sketch of a body in motion that shows bending forces of the body
B)  It’s a sketch of an undisturbed body that shows external forces of the body
C)  It’s a sketch of a moving body that shows internal forces of the body and reaction forces
D)  It’s a sketch of an isolated body that shows external forces of the body and reaction forces

Correct Answer :   It’s a sketch of an isolated body that shows external forces of the body and reaction forces

Explanation : A free-body diagram is a drawing of an isolated body that depicts external forces operating on it as well as reaction forces imposed by removing parts.

158 .
The internal force in structures among the following is?
A)  Compression force
B)  Impact force
C)  Gravity force
D)  Bending force

Correct Answer :   Compression force

Explanation : Internal forces are forces that act between elements of a structure. The internal force is the compression force. Compression is the force that squeezes the particles of an item together.

159 .
Which of the following is a feature of friction?
A)  It is an active force
B)  Not a self-adjusting force
C)  Always acts in the direction of applied force
D)  Always acts in the direction opposite to the applied force

Correct Answer :   Always acts in the direction opposite to the applied force

Explanation : A resistive force is created when one body slides over another. Frictional force is the name for this opposing force. It works in the opposite direction of the applied force.

160 .
The coefficient of restitution for inelastic bodies is
A)  zero
B)  one
C)  more than one
D)  between zero and one

Correct Answer :   zero

161 .
Moment of inertia is the
A)  second moment of area
B)  second moment of mass
C)  second moment of force
D)  All of the above

Correct Answer :   All of the above

162 .
The term 'centroid' is
A)  the point of suspension
B)  the same as centre of gravity
C)  the point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis
D)  None of the above

Correct Answer :   the same as centre of gravity

163 .
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)  80 N
B)  40 N
C)  20 N
D)  None of the above

Correct Answer :   20 N

164 .
When there is no relative force between touching surfaces, which of the following force is developed?
A)  Static friction
B)  Dry friction
C)  Fluid friction
D)  Dynamic friction

Correct Answer :   Static friction

Explanation : The frictional force that emerges when there is no relative motion between the contacting surfaces is known as static friction.

165 .
When the surfaces of two bodies come in contact, there is a limited amount of resistance to sliding between them, which is known as _______
A)  Lubrication
B)  Friction
C)  Internal forces
D)  Attraction force

Correct Answer :   Friction

Explanation : Frictional force is the resistive force that is created when the surfaces of two bodies come into contact. Various lubrication strategies are used to reduce friction.

166 .
Which of the following doesn’t affect frictional force?
A)  Area of contact
B)  Surface roughness
C)  Reaction of surface
D)  Force tending cause motion

Correct Answer :   Area of contact

Explanation : Friction is a resistive force that acts on a body regardless of the size of the contact area between the surfaces.

167 .
The centre of gravity a T-section 100 mm x 150 mm x 50 mm from its bottom is
A)  75mm
B)  50mm
C)  125mm
D)  87.5mm

Correct Answer :   87.5mm

168 .
In order to completely specify angular displacement by a vector, it must fix
A)  sense of angular displacement
B)  direction of the axis of rotation
C)  magnitude of angular displacement
D)  All of the above

Correct Answer :   All of the above

169 .
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

Correct Answer :   All of the above

170 .
The resultant of the two forces P and Q is R. If Q is doubled, the new resultant is perpendicular to P. Then
A)  Q = 2R
B)  P = Q
C)  Q = R
D)  None of the above

Correct Answer :   Q = R

171 .
Onejoule is equal to_____.
A)  1 N-m
B)  0.1 N-m
C)  10 N-m
D)  100 N-m

Correct Answer :   1 N-m

172 .
Whenever a force acts on a body and the body undergoes a displacement, then
A)  power is being transmitted
B)  work is said to be done
C)  body has kinetic energy of translation
D)  None of the above

Correct Answer :   work is said to be done

173 .
The acceleration of a body sliding down an inclined surface is
A)  g sin θ
B)  g cos θ
C)  g tan θ
D)  None of the above

Correct Answer :   g sin θ

174 .
If a body is acted upon by a number of coplaner non-concurrent forces, it may
A)  be completely at rest
B)  rotate about itself without moving
C)  move in any one direction rotating about itself
D)  All of the above

Correct Answer :   All of the above

175 .
Which of the following is valid if two forces are represented by two sides of a triangle in order?
A)  The resultant’s magnitude is zero
B)  The resultant’s magnitude is greatest
C)  The resultant of two forces is represented by the third side in reverse order
D)  The resultant of two forces is represented by the third side in the same sequence

Correct Answer :   The resultant of two forces is represented by the third side in reverse order

Explanation : If two forces act concurrently on a particle and are represented by two sides of a triangle taken in order, the resultant is represented by the third side taken in reverse order, according to the Triangle Law of Forces.

176 .
What is the relationship between each force, if three concurrent forces acting on a body according to Lami's theorem?
A)  Inversely proportional to the sine of the angle between the other two forces
B)  Directly proportional to the sine of the angle between the other two forces
C)  Directly proportional to the cosine of the angle between the other two forces
D)  Inversely proportional to the cosine of the angle between the other two forces

Correct Answer :   Directly proportional to the sine of the angle between the other two forces

Explanation : If three concurrent forces act on a body, each force is proportional to the sine of the angle between the other forces, according to Lami’s theorem.

177 .
Which of the following is a vector quantity?
A)  Mass
B)  Volume
C)  Density
D)  Acceleration

Correct Answer :   Acceleration

Explanation : The only thing that determines a scalar quantity is its magnitude. Vector quantities are those that are affected by both magnitude and direction. The magnitude and direction of acceleration are both defined.

178 .
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
A)  sin θ
B)  cos θ
C)  tan θ
D)  cosec θ

Correct Answer :   sin θ

179 .
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)  equal to
A)  
B)  less than
B)  
C)  more than
C)  
D)  None of the above
D)  

Correct Answer :   more than

180 .
A body of weight W is required to move up on rough inclined plane whose angle of inclination with the horizontal is α. The effort applied parallel to the plane is given by(where μ = tanφ = Coefficient of friction between the plane and the body.)
A)  P = W tanα
A)  
B)  P = W tan(α + φ)
B)  
C)  P = W (sinα + μcosα)
C)  
D)  P = W (cosα + μsinα)
D)  

Correct Answer :   P = W (sinα + μcosα)

181 .
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)  30°
B)  60°
C)  90°
D)  120°

Correct Answer :   120°

182 .
The velocity ratio of a simple wheel and axle with D and d as the diameters of effort wheel and load axle, is
A)  D + d
B)  D / d
C)  D - d
D)  D x d

Correct Answer :   D / d

183 .
The unit of force in S.I. system of units is
A)  dyne
B)  watt
C)  newton
D)  kilogram

Correct Answer :   newton

184 .
The moment of inertia of a solid cone of mass m and base radius r about its vertical axis is
A)  2mr²/5
B)  3mr²/5
C)  3mr²/10
D)  4mr²/5

Correct Answer :   3mr²/10

185 .
A ladder is resting on a rough ground and leaning against a smooth vertical wall. The force of friction will act
A)  zero at its upper end
B)  upward at its upper end
C)  downward at its upper end
D)  perpendicular to the wall at its upper end

Correct Answer :   zero at its upper end

186 .
What is the the effect of a force upon a body according to the principle of transmissibility of forces?
A)  Minimum when acting at the body’s centre of gravity
B)  Maximum when acting at the body’s centre of gravity
C)  Different at various locations along its line of action
D)  The same at all points along its line of action

Correct Answer :   The same at all points along its line of action

Explanation : The point of application of a force can be conveyed along its line of action without modifying the force’s impact on the rigid body to which it is applied, according to the theorem of transmissibility of a force. Every point along its path of action is the same.

187 .
The moment of the resultant of two concurrent forces to a center in their plane is equal to
A)  The difference between the components moments at the same centre
B)  The algebraic sum of the moments of the components to the same centre
C)  The difference in component moments with respect to a different centre
D)  The algebraic sum of the moments of the components to a different centre

Correct Answer :   The algebraic sum of the moments of the components to the same centre

Explanation : The moment of the resultant of two concurrent forces to a location in their plane is equal to the algebraic sum of the moments of the components to the same centre, according to the varignon theorem in mechanics.

188 .
Which of the following conditions doesn’t affect the magnitude of the moment?
A)  If the resultant is maximal
B)  If the point of application of force is along the line of action
C)  If the point of application of force is opposing the line of action
D)  If the moment of centre is shifted along a line perpendicular to the line of action

Correct Answer :   If the point of application of force is along the line of action

Explanation : If the point of application of force is transported along the line of action and the moment of the centre is moved down a line parallel to the line of action of force, the magnitude of the moment remains unchanged. The magnitude is unaffected in either instance.

189 .
Which of the following forces do not cause the rotation?
A)  Parallel
B)  Non-Parallel
C)  Concurrent
D)  Non-concurrent

Correct Answer :   Concurrent

Explanation : The concurrent forces are those that are in contact with the rotation axis in some way. If any of the forces are in contact with that axis, they are either ignored or inadequate to create a rotation. When a force is contemporaneous, its perpendicular distance from an axis line is 0, implying that there is no rotation. An instant, as we all know, causes rotation.

190 .
The moment is the cross product of which of the following two vectors/scalars?
A)  Radius and Force vectors
B)  Radius and Force scalars
C)  Force and Radius scalars
D)  Force and Radius vectors

Correct Answer :   Radius and Force vectors

Explanation : The cross-product must be created in the correct order. If no action is taken, the result is the polar opposite of the genuine result. As a result, the answer is the Radius and Force vectors, not the Force and Radius vectors. Because the moment, like many of the cross products, has a sense of direction, vigilance is required.

191 .
The point, through which the whole weight of the body acts, irrespective of its position, is known as
A)  centre of gravity
B)  centre of mass
C)  moment of inertia
D)  centre of percussion

Correct Answer :   centre of gravity

192 .
Which of the following is a scalar quantity?
A)  Force
B)  Speed
C)  Velocity
D)  Acceleration

Correct Answer :   Speed

193 .
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
A)  Newton's first law of motion
A)  
B)  Newton's second law of motion
B)  
C)  Newton's third law of motion
C)  
D)  None of the above
D)  

Correct Answer :   Newton's second law of motion

194 .
Which part of the truss section is made to employ the method of joints in the free body diagram?
A)  Truss
B)  The whole structure
C)  Joints
D)  Combination of joint and the whole structure

Correct Answer :   Joints

Explanation : The method of joints is used in the free body diagram of joints part of the truss section. To perform the calculations, many equilibrium equations are used. In the vertical direction, the net force is set to zero. Forces in the horizontal direction are also made to be zero.

195 .
Which element of the truss section is made to apply the method of sections in the free body diagram?
A)  Truss
B)  Joints
C)  The whole structure
D)  Any section can be used

Correct Answer :   Any section can be used

Explanation : The method of sections is used to create a free body diagram of any element of the truss section. To perform the calculations, many equilibrium equations are used. In the vertical direction, the net force is set to zero. In addition, horizontal direction forces have been set to zero.

196 .
If the body falls freely under gravity, then the gravitational acceleration is taken as
A)  +8.9 m/s²
B)  -8.9 m/s²
C)  +9.8 m/s²
D)  -9.8 m/s²

Correct Answer :   +9.8 m/s²

197 .
A framed structure, as shown in the below figure, is a
A)  perfect frame
A)  
B)  deficient frame
B)  
C)  redundant frame
C)  
D)  None of the above
D)  

Correct Answer :   perfect frame

198 .
The rate of change of displacement of a body is called
A)  momentum
B)  velocity
C)  acceleration
D)  None of the above

Correct Answer :   velocity

199 .
Which of the following contains moving parts?
A)  Machines
B)  Truss
C)  Beam
D)  Frames

Correct Answer :   Machines

Explanation : The machines are constructed in such a way that the moving parts are contained. Machines are built to have moving parts since they are used in a variety of fields. They’re also made in such a way that the working bits within aren’t damaged.

200 .
The change in the moment is equal to which of the following?
A)  Total weight
B)  Bending moment
C)  Rotational moment
D)  Area under the shear diagram

Correct Answer :   Area under the shear diagram

Explanation : After the application of the force equation of equilibrium to the segment of the beam, we have the above result. This is done on the very small part of the beam. That is the minimal section of the beam is to be considered and then the application of the equilibrium equations is done so as to calculate the final result.

201 .
The efficiency of a screw jack is maximum, when(where α = Helix angle, and φ = Angle of friction.)
A)  α = 90° + φ
B)  α = 90° - φ
C)  α = 45° + φ/2
D)  α = 45° - φ/2

Correct Answer :   α = 45° - φ/2

202 .
The periodic time (T) is given by(where ω = Angular velocity of particle in rad / s.)
A)  π/ω
B)  2π/ω
C)  ω/2π
D)  2π x ω

Correct Answer :   2π/ω

203 .
In the journal bearings calculations, the moment is the cross product of which of the following two vectors?
A)  Force and Radius vectors
B)  Force and Radius scalars
C)  Radius and Force vectors
D)  Radius and Force scalars

Correct Answer :   Radius and Force vectors

Explanation : The cross-product must be created in the correct order. If no action is taken, the result is the polar opposite of the genuine result. As a result, the answer is the Radius and Force vectors, not the Force and Radius vectors. Because the moment, like many of the cross products, has a sense of direction, vigilance is required.

204 .
In the free body diagrams, the normal forces acting on the belt are in which of the following direction for calculating the equilibrium equations?
A)  Vertically Upward
B)  Vertically Downward
C)  Horizontally Left
D)  Horizontally Right

Correct Answer :   Vertically Upward

Explanation : Because the loads are acting in a downward direction. The normal forces act in a vertically upward fashion to balance the forces. Dry friction occurs when there is no lubricating fluid present between the surfaces in contact, as we all know. The magnitude of friction is subtracted from the normal forces.

205 .
The friction experienced by a body, when in motion, is known as
A)  dynamic friction
B)  static friction
C)  rolling friction
D)  limiting friction

Correct Answer :   dynamic friction

206 .
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
A)  v
B)  v/2
C)  v/4
D)  v/8

Correct Answer :   v/2

207 .
Over a block of weight W, the theory of friction is described. Which of the following describes the surface on which of the following block is located?
A)  Non-rigid
B)  Coloured red
C)  Having density in negative
D)  The motion of that block is always horizontal

Correct Answer :   Non-rigid

Explanation : A deformable surface is a block used to teach the theory of friction. Dry friction occurs when there is no lubricating fluid present between the surfaces in contact, according to the theory of friction. As a result, to demonstrate that the same tests can be performed on a non-rigid/deformable surface.

208 .
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)  Both (A) and (B)
D)  None of the above

Correct Answer :   Agree

209 .
Which of the following type of screws is used in the machines?
A)  Round-threaded
B)  Helical-threaded
C)  Square-threaded
D)  Rectangle-threaded

Correct Answer :   Square-threaded

Explanation : In the machines, square threaded screws are employed. Because screws are commonly employed as fasteners. The fundamental benefit of screws is that the friction aids in the structure’s retention. Screws also aid in the fast and efficient joining of the structure.

210 .
The coefficient of restitution for elastic bodies is one.
A)  Correct
B)  Incorrect
C)  Both (A) and (B)
D)  Neither (A) nor (B)

Correct Answer :   Incorrect

Explanation : Coefficient of restitution for elastic bodies is 0 - 1.

Coefficient of restitution for perfect elastic bodies is 1.

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