Civil Engineering : Applied Mechanics MCQs with Answers

1 .
Kinetic friction may be defined as
A)  friction force acting when the body is in motion
B)  ratio of limiting friction and normal reaction
C)  friction force acting when the body is just about to move
D)  angle between normal reaction and resultant of normal reaction and limiting friction

Correct Answer :   friction force acting when the body is in motion

2 .
Ball A of mass 250 g moving on a smooth horizontal table with a velocity of 10 m/s hits an identical stationary ball B on the table. If the impact is perfectly elastic, the velocity of the ball B just after impact would be___.
A)  zero
B)  5 m/sec
C)  10 m/sec
D)  None of the Above

Correct Answer :   10 m/sec

3 .
The centre of gravity of a homogenous body is the point at which the whole_____.
A)  volume of the body is assumed to be concentrated
B)  weight of the body is assumed to be concentrated
C)  area of the surface of the body is assumed to be concentrated
D)  All of the above

Correct Answer :   weight of the body is assumed to be concentrated

4 .
Pick up the correct statement from the following :
A)  If two equal and perfectly elastic smooth spheres impinge directly, they interchange their velocities.
B)  If a smooth sphere impinges on another sphere, which is at rest, the latter will move along the line of centres.
C)  If two equal spheres which are perfectly elastic impinge at right angles, their direction after impact will still be at right angles.
D)  All of the above

Correct Answer :   All of the above

Explanation : * If two equal and perfectly elastic smooth spheres impinge directly, they interchange their velocities.
* If a smooth sphere impinges on another sphere, which is at rest, the latter will move along the line of centres.
* If two equal spheres which are perfectly elastic impinge at right angles, their direction after impact will still be at right angles.
* If a sphere impinges directly on an equal sphere which is at rest, then a fraction (1 - e2) the original kinetic energy is lost by the impact.

5 .
The angular speed of a car taking a circular turn of radius 100 m at 36 km/hr will be________.
A)  1 rad/sec
B)  10 rad/sec
C)  0.1 rad/sec
D)  100 rad/sec

Correct Answer :   0.1 rad/sec

6 .
The angle of friction is _________.
A)  The force of friction when the body is in motion
B)  The ratio of the friction and the normal reaction
C)  The force of friction at which the body is just about to move
D)  The angle between the normal reaction and the resultant of normal raction and limiting friction

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

7 .
The resultant of two forces acting at right angles is 5 kgf and if they act at an angle of 60°, it is √37 kgf. The magnitudes of the forces are :
A)  3 kgf, 4 kgf
A)  
B)  4 kgf, 5 kgf
B)  
C)  5 kgf, 3 kgf
C)  
D)  None of the above
D)  

Correct Answer :   3 kgf, 4 kgf

8 .
A body is said to move with Simple Harmonic Motion if its acceleration, is______.
A)  Always directed away from the centre, the point of reference
B)  Proportional to the distance from the point of reference and directed towards it
C)  Inversely proportion to the distance from the point of reference
D)  Proportional to the square of the distance from the point of reference

Correct Answer :   Proportional to the distance from the point of reference and directed towards it

9 .
The c.g. of a thin hollow cone of height h, above its base lies on the axis, at a height of_____.
A)  h / 3
B)  h / 4
C)  2h / 3
D)  3h / 4

Correct Answer :   2h / 3

10 .
Two forces act an angle of 120°. If the greater force is 50 kg and their resultant is perpendicular to the smaller force, the smaller force is______.
A)  25 kg
B)  30 kg
C)  35 kg
D)  40 kg

Correct Answer :   25 kg

11 .
A glass ball is shot to hit a wall from a point on a smooth floor. If the ball returns back to the point of projection in twice the time taken in reaching the wall, the coefficient of restitution between the glass ball and the wall is_______.
A)  0.25
B)  0.35
C)  0.40
D)  0.50

Correct Answer :   0.50

12 .
In case of S.H.M. the period of oscillation(T), is given by________.
A)  T = 2n/ω
B)  T = 2/2ω
C)  T = n/2ω
D)  None of the Above

Correct Answer :   T = 2n/ω

13 .
If α and u are angle of projection and initial velocity of a projectile respectively, the total time of flight, is given by______.
A)  T = u sin 2α / g
B)  T = u sin² α / g
C)  T = u sin² α / 2g
D)  T = 2u sin α / g

Correct Answer :   T = 2u sin α / g

14 .
The C.G. of a right circular cone lies on its axis of symmetry at a height of_____.
A)  h/3
B)  h/4
C)  h/5
D)  h/6

Correct Answer :   h/4

15 .
A uniform rod 9 m long weighing 40 kg is pivoted at a point 2 m from one end where a weight of 120 kg is suspended. The required force acting at the end in a direction perpendicular to rod to keep it equilibrium, at an inclination 60° with horizontal, is____.
A)  10 kg
B)  40 kg
C)  60 kg
D)  100 kg

Correct Answer :   10 kg

16 .
ω rad/sec is the angular velocity of a crank whose radius is r. If it makes θ° with inner dead centre and obliquity of the connecting rod l is φ, the velocity v of the piston, is given by the equation_____.
A)  ω(l sin φ + r cos φ tan θ)
B)  ω²(l sin φ + r cos φ tan θ)
C)  ω²(l sin φ - r cos θ tan φ)
D)  ω²(l cos φ + r sin φ tan θ)

Correct Answer :   ω(l sin φ + r cos φ tan θ)

17 .
If the angle of projection is double the angle of inclination (α) of the plane on which particle is projected, the ratio of times of fligh up the inclined plane and down the inclined plane, will be_______.
A)  2 cos α
B)  1 / 2 cos α
C)  1 / 2 sin α
D)  1 / 2 tan α

Correct Answer :   1 / 2 cos α

18 .
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

Correct Answer :   22.5 kg

19 .
The inherent property of a body which offers reluctance to change its state of rest or uniform motion, is_______.
A)  mass
B)  momentum
C)  weight
D)  interia

Correct Answer :   interia

20 .
For a body moving with simple harmonic motion, the number of cycles per second, is known as its________.
A)  amplitude
B)  frequency
C)  oscillation
D)  periodic time

Correct Answer :   frequency

21 .
If the horizontal range is 2.5 times the greatest height, the angle of projection of the projectile, is____.
A)  58°
B)  59°
C)  60°
D)  65°

Correct Answer :   58°

22 .
Centre of gravity of a thin hollow cone lies on the axis of symmmetry at a height of____.
A)  one-half of the total height above base
B)  one-third of the total height above base
C)  one-fourth of the total height above base
D)  None of the Above

Correct Answer :   one-third of the total height above base

23 .
A ball of mass 1 kg moving with a velocity of 2 m/sec collides a stationary ball of mass 2 kg and comes to rest after impact. The velocity of the second ball after impact will be______.
A)  zero
B)  0.5 m/sec
C)  2.0 m/sec.
D)  1.0 m/sec

Correct Answer :   1.0 m/sec

24 .
A load of 500 kg was lifted through a distance of 13 cm. by an effort of 25 kg which moved through a distance of 650 cm. The velocity ratio of the lifting machine is____.
A)  50
B)  65
C)  70
D)  80

Correct Answer :   50

25 .
The motion of a particle is described by the relation x = t²- 10t + 30, where x is in metres and t in seconds. The total distance travelled by the particle from t = 0 to t = 10 seconds would be____.
A)  zero
B)  30 m
C)  50 m
D)  60 m

Correct Answer :   zero

26 .
Three forces which act on a rigid body to keep it in equilibrium. The forces must be coplanar and____.
A)  parallel
B)  concurrent
C)  concurrent parallel
D)  None of the Above

Correct Answer :   concurrent

27 .
For perfectly elastic bodies, the value of coefficient of restitution is_____.
A)  zero
B)  0.5
C)  1.0
D)  Between 0 and 1

Correct Answer :   1.0

28 .
Time of flight of a projectile on a horizontal plane, is_____.
A)  2u cos α / g
B)  2u tan α / g
C)  2u cot α / g
D)  2u sin α / g

Correct Answer :   2u sin α / g

29 .
A ball is dropped from a height of 2.25 m on a smooth floor and rises to a height of 1.00 m after the bounce. The coefficient of restitution between the ball and the floor is_______.
A)  0.33
B)  0.44
C)  0.57
D)  0.67

Correct Answer :   0.67

30 .
A marble ball is rolled on a smooth floor of a room to hit a wall. If the time taken by the ball in returning to the point of projection is twice the time taken in reaching the wall, the coefficient of restitution between the ball and the wall, is____.
A)  0.50
B)  0.75
C)  1.0
D)  2.0

Correct Answer :   0.50

31 .
In a lifting machine a weight of 5 kN is lifted through 200 mm by an effort of 0.1 kN moving through 15 m. The mechanical advantage and velocity ratio of the machine are respectively_____.
A)  50 and 50
B)  50 and 75
C)  75 and 50
D)  75 and 75

Correct Answer :   50 and 75

32 .
If a particle is projected inside a horizontal tunnel which is 554 cm high with a velocity of 60 m per sec, the angle of projection for maximum range, is___.
A)  9°
B)  10°
C)  11°
D)  12°

Correct Answer :   11°

33 .
A load of 500 kg was lifted through a distance of 13 cm. by an effort of 25 kg which moved through a distance of 650 cm. The efficiency of the lifting machine is_____.
A)  40%
B)  50%
C)  55%
D)  65%

Correct Answer :   40%

34 .
A string of length 90 cm is fastened to two points A and B at the same level 60 cm apart. A ring weighing 120 g is slided on the string. A horizontal force P is applied to the ring such that it is in equilibrium vertically below B. The value of P is ________.
A)  40 g
B)  60 g
C)  80 g
D)  100 g

Correct Answer :   80 g

35 .
Pick up the correct statement from the following :
A)  The gravitational intensity declines with height
B)  Nature plays an important role in the launch of a satellite
C)  The gravitational force relents as the satellite climbs higher
D)  All of the above

Correct Answer :   All of the above

Explanation : * The gravitational intensity declines with height
* Nature plays an important role in the launch of a satellite
* The gravitational force relents as the satellite climbs higher
* The earth's gravity reduces the speed of a satellite by 32 km per second

36 .
If the radius of the earth is 600 km the height of a mountain above sea level at the top of which a beat seconds pendulum at sea level, looses 27 seconds a day, is____.
A)  25000 metres
B)  2000 metres
C)  1500 metres
D)  1000 metres

Correct Answer :   2000 metres

37 .
The total time of collision and restitution of two bodies, is called
A)  time of collision
B)  period of impact
C)  period of collision
D)  All of the above

Correct Answer :   All of the above

38 .
The length of a Second's pendulum, is______.
A)  99.4 cm
B)  100 cm
C)  101 cm
D)  101.10 cm

Correct Answer :   99.4 cm

39 .
A smooth cylinder lying on its convex surface remains_____.
A)  out of equilibrium
B)  in neutral equilibrium
C)  in unstable equilibrium
D)  in stable equilibrium

Correct Answer :   in unstable equilibrium

40 .
A weight W is suspended at the free end of a light member hinged to a vertical wall. If the angle of inclination of the member with the upper wall is θ°, the force introduced in the member, is_______.
A)  W cos θ
B)  W sin θ
C)  W sec θ
D)  W cosec θ

Correct Answer :   W sec θ

41 .
A satellite goes on moving along its orbit round the earth due to______.
A)  centripital force
B)  centrifugal force
C)  gravitational force
D)  None of the Above

Correct Answer :   centrifugal force

42 .
The shape of a suspended cable under its own weight, is_________.
A)  circular
B)  parabolic
C)  elliptical
D)  catenary

Correct Answer :   catenary

43 .
Time required to stop a car moving with a velocity 20 m/sec within a distance of 40 m, is_____.
A)  4 sec
B)  5 sec
C)  6 sec
D)  7 sec

Correct Answer :   4 sec

44 .
Periodic time of a particle moving with simple harmonic motion is the time taken by the particle for________.
A)  half oscillation
B)  quarter oscillation
C)  Both (A) and (B)
D)  complete oscillation

Correct Answer :   complete oscillation

45 .
The motion of a bicycle wheel is______
A)  rotary
B)  translatory
C)  rotary and translatory
D)  curvilinear

Correct Answer :   rotary and translatory

46 .
The displacement of a particle which moves along a straight line is given by S = 4t³ + 3t² - 10 where S is in meters and t is in seconds. The time taken by the particle to acquire a velocity of 18 m/sec from rest, is_____.
A)  1 sec
B)  1.5 sec
C)  1.9 sec
D)  2.5 sec

Correct Answer :   1 sec

47 .
Pick up the correct statement from the following. The kinetic energy of a body_______.
A)  remains constant
B)  before impact is more than that after impact
C)  before impact is equal to that after impact
D)  before impact is less than that after impact

Correct Answer :   before impact is more than that after impact

48 .
A particle moving with a simple harmonic motion, attains its maximum velocity when it passes________.
A)  through a point at half amplitude
B)  through the mean position
C)  the extreme point of the oscillation
D)  None of the Above

Correct Answer :   through the mean position

49 .
The maximum frictional force which comes into play, when a body just begins to slide over the surface of a an other body, is known______.
A)  sliding friction
B)  rolling friction
C)  Both (A) and (B)
D)  limiting friction

Correct Answer :   limiting friction

50 .
If G is the Gauge of track, v is velocity of the moving vehicle, g is the acceleration due to gravity and r is the radius of a circular path, the required superelevation is____.
A)  gv²/gr
B)  gr²/gr
C)  gr²/gv²
D)  gv²/gv

Correct Answer :   gv²/gv

51 .
The moment of intertia of a circular lamina of diameter d, about an axis perpendicular to the plane of the lamina and passing through its centre, is_____.
A)  πd⁴/32
B)  πd⁴/24
C)  πd⁴/16
D)  πd⁴/12

Correct Answer :   πd⁴/32

52 .
The unit of impulse, is______.
A)  kg.m/sec
B)  kg.m/sec²
C)  kg.m/sec³
D)  kg.m²/sec

Correct Answer :   kg.m/sec

53 .
If v and ω are linear and angular velocities, the centripetal acceleration of a moving body along the circular path of radius r, will be____.
A)  r/v²
B)  v²/r
C)  r/ω²
D)  ω²/r

Correct Answer :   v²/r

54 .
If two forces of 3 kg and 4 kg act at right angles to each other, their resultant force will be equal to________.
A)  1 kg
B)  7 kg
C)  5 kg
D)  1/7 kg

Correct Answer :   5 kg

55 .
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

Correct Answer :   425 m

56 .
A stone of mass 1 kg is tied to a string of length 1 m and whirled in a horizontal circle at a constant angular speed 5 rad/sec. The tension in the string is,_________.
A)  5 N
B)  10 N
C)  15 N
D)  25 N

Correct Answer :   25 N

57 .
For a simple pendulum, time period for a beat, is________.
A)  π√l/g
B)  π√2l/g
C)  π√g/2l
D)  π√l/2g

Correct Answer :   π√l/g

58 .
The ratio of the moment of inertia of a rectangle about its centroidal axis to the moment of inertia about its base, is____.
A)  1/2
B)  1/4
C)  3/4
D)  2

Correct Answer :   1/4

59 .
The apparent weight of a man in a moving lift is less than his real weight when it is going down with____.
A)  retardation
B)  uniform speed
C)  an acceleration
D)  linear momentum

Correct Answer :   an acceleration

60 .
The centre of gravity of a quadrant of a circle lies along its central radius at a distance of_______.
A)  0.2 R
B)  0.3 R
C)  0.4 R
D)  0.6 R

Correct Answer :   0.6 R

61 .
If g₁ and g₂ are the gravitational accelerations on two mountains A and B respectively, the weight of a body when transported from A to B will be multiplied by___.
A)  g₁
B)  g₂
C)  g₁ / g₂
D)  g₂ / g₁

Correct Answer :   g₂ / g₁

62 .
Dimensional formula of Universal Gravitational constant G is_______.
A)  M-⁻¹L³T⁻²
B)  M⁻¹L²T⁻²
C)  M⁻²L²T⁻²
D)  M⁻²L³T⁻²

Correct Answer :   M⁻¹L²T⁻²

63 .
Effect of a force on a body depends upon its_____.
A)  Direction
B)  Position
C)  Magnitude
D)  All of the above

Correct Answer :   All of the above

64 .
if l is the span of a light suspension bridge who's each cable carries total weight (w) and the central dip is y, the horizontal pull at each support, is______.
A)  wl / 8y
B)  wl / 4y
C)  wl / 2y
D)  wl

Correct Answer :   wl / 8y

65 .
If three rigid rods are hinged together to form a triangle and are given rotary as well as translatory motion, the number of instantaneous centres of the triangle, will be_____.
A)  1
B)  2
C)  3
D)  4

Correct Answer :   3

66 .
The mechanical advantage of an ideal machine is 100. For moving the local through 2 m, the effort moves through_____.
A)  0.02 m
B)  2 m
C)  2.5 m
D)  20 m

Correct Answer :   0.02 m

67 .
When a body in equilibrium undergoes an infinitely small displacement, work imagined to be done, is known as_________.
A)  negative work
B)  virtual work
C)  imaginary work
D)  None of the Above

Correct Answer :   virtual work

68 .
The resultant of two forces P and Q acting at an angle θ, is_______.
A)  P² + Q² + 2P sin θ
B)  P² + Q² + 2PQ cos θ
C)  P² + Q² + 2PQ tan θ
D)  √P² + Q² + 2PQ cos θ

Correct Answer :   √P² + Q² + 2PQ cos θ

69 .
To attain the synchronous orbit, the launch of a satellite, is done from a place______.
A)  on equator
B)  on the poles
C)  on 30° latitude
D)  on 45° latitude

Correct Answer :   on equator

70 .
A square hole is punched out of a circular lamina, the diagonal of the square being the radius of the circle. If r is the radius of the circle, the C.G. of the remainder from the corner of the square on the circumference will be__.
A)  r(π+0.25)/π-0.5
B)  r(π-0.5)/π+0.25
C)  r(π-0.25)/π-0.5
D)  r(π+0.25)/π+0.5

Correct Answer :   r(π-0.25)/π-0.5

71 .
A bullet weighing 200 g is fired horizontally with a velocity of 25 m/sec from a gun carried on a carriage which together with the gun weighs 100 kg. The velocity of recoil of the gun, will be________.
A)  1.00 m/sec
B)  1.5 m/see
C)  0.05 m/sec
D)  0.01 m/sec

Correct Answer :   0.05 m/sec

72 .
The tension in a cable supporting a lift________.
A)  is less when the lift is moving upwards
B)  is less when the lift is moving downwards
C)  is more when the lift is moving downwards
D)  remains constant whether its moves downwards or upwards

Correct Answer :   is less when the lift is moving downwards

73 .
A satellite moves in its orbit around the earth due to______.
A)  Centripetal force
B)  Centrifugal force
C)  Gravitational force
D)  None of the Above

Correct Answer :   Centripetal force

74 .
If the tension in a cable supporting a lift moving upwards is twice the tension when the lift is movng downwards, the acceleration of the lift, is_____.
A)  g/2
B)  g/3
C)  g/4
D)  g/5

Correct Answer :   g/2

75 .
If a spherical body is symmetrical about its perpendicular axes, the moment of inertia of the body about an axis passing through its centre of gravity as given by Routh's rule is obtained by dividing the product of the mass and the sum of the squares of two semi-axes by n where n is_____.
A)  2
B)  3
C)  4
D)  5

Correct Answer :   5

76 .
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)  45°
B)  60°
C)  75°
D)  85°

Correct Answer :   75°

77 .
A particle executes a simple harmonic motion. While passing through the mean position, the particle possesses___.
A)  maximum kinetic energy and maximum potential energy
B)  maximum kinetic energy and minimum potential energy
C)  minimum kinetic energy and maximum potential energy
D)  minimum kinetic, energy and minimum potential energy

Correct Answer :   maximum kinetic energy and minimum potential energy

78 .
Varigon's theorem of moments states______.
A)  algebraic sum of the moments of two forces about any point, is equal to the moment of their resultant about that point
B)  arithmetical sum of the moments of two forces about any point, is equal to the moments of their resultant about that point
C)  algebraic sum of the moments of the forces about any point in their plane, is equal to the moment of their resulant about that point
D)  arithmetical sum of the moments of the forces about any point in their plane, is equal to the moment of their resultant about that point

Correct Answer :   algebraic sum of the moments of the forces about any point in their plane, is equal to the moment of their resulant about that point

79 .
A stone is whirled in a vertical circle, the tension in the string, is maximum
A)  when the stone is at the lowest position
B)  when the string is horizontal
C)  when the stone is at the highest position
D)  at all the positions

Correct Answer :   when the stone is at the lowest position

80 .
The intrinsic equation of catenary is____.
A)  S = c tan ψ
B)  y = c cosh ψ
C)  y = c sinh ψ
D)  y = c cosh x/c

Correct Answer :   S = c tan ψ

81 .
A ball which is thrown upwards, returns to the ground describing a parabolic path during its flight
A)  speed of the ball remains constant
B)  horizontal component of velocity remains constant
C)  kinetic energy of the ball remains constant
D)  vertical component of velocity remains constant

Correct Answer :   horizontal component of velocity remains constant

82 .
Angular acceleration of a particle may be expressed as____.
A)  radians/sec²
B)  degrees/sec²
C)  revolutions/sec
D)  All of the above

Correct Answer :   All of the above

83 .
Total no of instantaneous centres of a machine having n links, is_____.
A)  n
B)  n/2
C)  (n - 1)
D)  n(n-1) / 2

Correct Answer :   n(n-1) / 2

84 .
The practical units of work, is_____.
A)  erg
B)  dyne
C)  joule
D)  Newton

Correct Answer :   joule

85 .
The rate of change of displacement of a body with respect to its surrounding, is known____.
A)  speed
B)  velocity
C)  acceleration
D)  None of the Above

Correct Answer :   speed

86 .
The C.G. of a hemisphere from its base measured along the vertical radius is at a distance of
A)  8R / 3
B)  3R / 8
C)  4R / 3π
D)  3πR / 4

Correct Answer :   3R / 8

87 .
The Centre of gravity of a 10 x 15 x 5 cm T section from its bottom, is_____.
A)  5.0 cm
B)  7.5 cm
C)  7.85 cm
D)  8.75 cm

Correct Answer :   8.75 cm

88 .
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 statics
C)  equation of dynamic equilibrium
D)  None of the Above

Correct Answer :   equation of dynamics

89 .
Newtons's Law of Motion is :
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)  All of the above

Correct Answer :   All of the above

90 .
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

Correct Answer :   5

91 .
The moment of inertia of a hollow circular section whose external diameter is 8 cm and internal diameter is 6 cm, about centroidal axis, is____.
A)  137.5 cm⁴
B)  237.5 cm⁴
C)  337.5 cm⁴
D)  437.5 cm⁴

Correct Answer :   137.5 cm⁴

92 .
The resultant of two forces acting at right angles is √34 kg and acting at 60° is 70 kg. The forces are
A)  3 kg and √5 kg
A)  
B)  √3 kg and 5 kg
B)  
C)  3 kg and 5 kg
C)  
D)  2 kg and 3 kg
D)  

Correct Answer :   3 kg and 5 kg

93 .
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

Correct Answer :   v = √2gh

94 .
Two particles have been projected at angles 64° and 45° to the horizontal. If the velocity of projection of first is 10 m/sec, the velocity of projection of the other for equal horizontal ranges is
A)  6.3 m/sec
B)  9.3 m/sec
C)  7.3 m/sec
D)  8.3 m/sec

Correct Answer :   9.3 m/sec

95 .
μ 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)  μ
B)  2μ
C)  3μ
D)  None of the Above

Correct Answer :   2μ

96 .
The necessary condition of equilibrium of a body, is :
A)  algebraic sum of vertical components of all the forces must be zero
B)  algebraic sum of horizontal components of all the forces must be zero
C)  algebraic sum of the moments of the forces about a point must be zero
D)  All of the above

Correct Answer :   All of the above

97 .
A trolley wire weighs 1 kg per metre length. The ends of the wire are attached to two poles 20 m apart. If the horizontal tension is 1000 kg, the central dip of the cable is____.
A)  5 cm
B)  4 cm
C)  3 cm
D)  2 cm

Correct Answer :   5 cm

98 .
One Newton force, is___
A)  10³ dynes
B)  10⁴ dynes
C)  10⁵ dynes
D)  10⁶ dynes

Correct Answer :   10⁵ dynes

99 .
The angle which an inclined surface makes with the horiontal when a body placed on it is on the point of moving down, is called___.
A)  angle of repose
B)  angle of friction
C)  angle of inclination
D)  None of the Above

Correct Answer :   angle of repose

100 .
Work may be defined as____.
A)  force x velocity
B)  force x distance
C)  force x acceleration
D)  None of the Above

Correct Answer :   force x distance

101 .
The product of mass and velocity of a moving a body, is called____.
A)  power
B)  moment
C)  impulse
D)  momentum

Correct Answer :   momentum

102 .
Engineer's units of force, is____.
A)  Newton in absolute units
B)  Dyne in absolute units
C)  Newton and dyne in absolute units
D)  All of the above

Correct Answer :   Newton in absolute units

103 .
Joule is the unit of____.
A)  power
B)  force
C)  work
D)  torque

Correct Answer :   work

104 .
According to Kennedy's theorem, if three bodies have plane motions, their instantaneous centres lie on_____.
A)  a point
B)  a triangle
C)  a straight line
D)  two straight lines

Correct Answer :   a straight line

105 .
A ball of mass 250 g moving on a smooth horizontal table with a velocity of 10 m/sec hits an identical stationary ball B on the table. If the impact is perfectly plastic, the velocity of the ball B just after impact would be____.
A)  zero
B)  5 m/sec
C)  10 m/sec
D)  None of the Above

Correct Answer :   zero

106 .
The characteristic of a couple, is :
A)  a couple can be never the balanced by a single force
B)  algebraic sum of forces, constituting a couple is zero
C)  algebraic sum of moments of forces, constituting a couple, about any poin, is same
D)  All of the above

Correct Answer :   All of the above

Explanation : * a couple can be never the balanced by a single force
* algebraic sum of forces, constituting a couple is zero
* algebraic sum of moments of forces, constituting a couple, about any poin, is same
* a couple can be balanced only by a couple but of opposite sense

107 .
If two forces P and Q (P > Q) act on the same straight line but in opposite direction, their resultant, is ____.
A)  Q - P
A)  
B)  P - Q
B)  
C)  P + Q
C)  
D)  P/Q
D)  

Correct Answer :   P - Q

108 .
If the angle between the applied force and the direction of motion of a body, is between 90° and 180°, the work done, is called___.
A)  zero work
B)  negative work
C)  virtual work
D)  imaginary work

Correct Answer :   negative work

109 .
The units of moment of inertia of an area, are____.
A)  m⁴
B)  m³
C)  kg/m
D)  kg/m²

Correct Answer :   m⁴

110 .
To avoid bending action at the base of a pier,_____.
A)  suspension and anchor cables are kept at the same level
B)  suspension cable and anchor cables are attached to a saddle mounted on rollers on top of the pier
C)  suspension and anchor cables are fixed to pier top
D)  None of the Above

Correct Answer :   suspension and anchor cables are fixed to pier top

111 .
Pick up the incorrect statement from the following. In case of suspension bridge due to rise in temperature,_____.
A)  dip of the cable increases
B)  dip of the cable decreases
C)  length of the cable increases
D)  None of the Above

Correct Answer :   dip of the cable decreases

112 .
For a self-locking machine, the efficiency should be____.
A)  less than 60%
B)  50%
C)  more than 50%
D)  None of the Above

Correct Answer :   less than 60%

113 .
When a body moves round a fixed axis, it has____.
A)  a translatory
B)  a rotary motion
C)  a circular motion
D)  a rotary motion and translatory motion.

Correct Answer :   a circular motion

114 .
Principle of Transmissibility of Forces states that, when a force acts upon a body, its effect is____.
A)  minimum if it acts at the C.G. of the body
B)  different at different points on its line of
C)  maximum if it acts at the centre of gravity of the body
D)  same at every point on its line of action

Correct Answer :   same at every point on its line of action

115 .
A ball is dropped from a height of 2.25 m on a smooth floor and rises to a height of 1.00 m after the bounce. The coefficient of restitution between the ball and the floor is____.
A)  0.33
B)  0.44
C)  0.57
D)  0.67

Correct Answer :   0.67

116 .
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)  5 rad/sec
B)  10 rad/sec
C)  15 rad/sec
D)  20 rad/sec

Correct Answer :   5 rad/sec

117 .
number of forces acting simultaneously on a particle of a body____.
A)  may be replaced by a couple
B)  may be replaced by a single force
C)  may not be replaced by a single force
D)  may be replaced by a single force through C.G. of the body

Correct Answer :   may be replaced by a single force

118 .
The force acting on a point on the surface of a rigid body may be considered to act_____.
A)  on the periphery of the body
B)  at the centre of gravity 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

Correct Answer :   on any point on the line of action of the force

119 .
A satellite is said to move in a synchronous orbit if it moves at an altitude of 36, 000 km with a maximum velocity of about____.
A)  8000 km per hour
B)  9000 km per hour
C)  10, 000 per hour
D)  11, 000 km per hour

Correct Answer :   11, 000 km per hour

120 .
Pick up the incorrect statement from the following :
A)  The C.G. of a circle is at its centre
B)  The C.G. of a triangle is at the intersecton of its medians
C)  The C.G. of a rectangle is at the intersection of its diagonals
D)  The C.G. of a semicircle is at a distance of r/2 from the centre

Correct Answer :   The C.G. of a semicircle is at a distance of r/2 from the centre

121 .
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)  90°
B)  60°
C)  45°
D)  30°

Correct Answer :   90°

122 .
A 49 kg lady stands on a spring scale in an elevator. During the first 5 sec, starting from rest, the scale reads 69 kg. The velocity of the elevator will be_____.
A)  25 m/sec
B)  20 m/sec
C)  15 m/sec
D)  10 m/sec

Correct Answer :   20 m/sec

123 .
The maximum velocity of a body vibrating with a simple harmonic motion of amplitude 150 mm and frequency 2 vibrations/sec, is____.
A)  0.18845 m/sec
B)  1.885 m/sec
C)  18.85 m/sec
D)  188.5 m/sec

Correct Answer :   1.885 m/sec

124 .
A cable loaded with 0.5 tonne per horizontal metre span is stretched between supports in the same horizontal line 400 m apart. If central dip is 20 m, the minimum tension in the cable, will be____.
A)  200 tonnes at the left support
B)  200 tonnes at the right support
C)  500 tonnes at the centre
D)  200 tonnes at the centre

Correct Answer :   500 tonnes at the centre

125 .
A particle moves along a straight line such that distance x traversed in t seconds is given by x = t²(t + 1), the acceleration of the particle, will be_____.
A)  6t + 2
B)  6t - 2
C)  3t - 2
D)  3t² + 2t

Correct Answer :   6t + 2

126 .
The Law of Polygon of Forces states that________.
A)  if a polygen representing the forces acting at point in a body is closed, the forces are in equilibrium
B)  if forces acting on a point can be represented in magnitude and direction by the sides of a polygon in order, the forces are in equilibrium.
C)  if forces acting on a point can be represented in magnitde and direction by the sides of a polygon taken in order, then the resultant of the forces will be represented in magnitude and direction by the closing side of the polygon
D)  if forces acting on a point can be represented of a polygon taken in order, their sides of a polygon taken in order, their resultant will be represented in magnitude and direction by the closing side of the polygon, taken in opposite order

Correct Answer :   if forces acting on a point can be represented of a polygon taken in order, their sides of a polygon taken in order, their resultant will be represented in magnitude and direction by the closing side of the polygon, taken in opposite order

127 .
The Law of Polygon of Forces states that________.
A)  if a polygen representing the forces acting at point in a body is closed, the forces are in equilibrium
B)  if forces acting on a point can be represented in magnitude and direction by the sides of a polygon in order, the forces are in equilibrium.
C)  if forces acting on a point can be represented in magnitde and direction by the sides of a polygon taken in order, then the resultant of the forces will be represented in magnitude and direction by the closing side of the polygon
D)  if forces acting on a point can be represented of a polygon taken in order, their sides of a polygon taken in order, their resultant will be represented in magnitude and direction by the closing side of the polygon, taken in opposite order

Correct Answer :   if forces acting on a point can be represented of a polygon taken in order, their sides of a polygon taken in order, their resultant will be represented in magnitude and direction by the closing side of the polygon, taken in opposite order

128 .
Parallelogram Law of Forces states, "if two forces acting simultaneously on a particle be represented in magnitude and direction by two adjacent sides of a parallelogram, their resultant may be represented in magnitude and direction by_____.
A)  its longer side
B)  its shorter side
C)  the diagonal of the parallelogram which passes through the point of intersection of the forces
D)  the diagonal of the parallelogram which does not pass through the point of intersection of the forces

Correct Answer :   the diagonal of the parallelogram which passes through the point of intersection of the forces

129 .
A projectile is thrown at an angle a to the horizontal with α velocity v. It will have the maximum centripetal acceleration_____.
A)  at the start
B)  else where
C)  as it strikes the ground
D)  at the top of the trajectory

Correct Answer :   at the start

130 .
If a body moves in such a way that its velocity increases by equal amount in equal intervals of time, it is said to be moving with_____.
A)  a uniform retardation
B)  a variable acceleration
C)  a variable retardation
D)  a uniform acceleration

Correct Answer :   a variable acceleration

131 .
If the gravitational accelerational at any place is doubled, the weight of a body, will_____.
A)  be doubled
B)  not be affected
C)  be reduced to half
D)  None of the Above

Correct Answer :   be doubled

132 .
If two forces each equal to T in magnitude act at right angles, their effect may be neutralised by a third force acting along their bisector in opposite direction whose magnitude will be____.
A)  1/2 T
B)  2 T
C)  √2 T
D)  3 T

Correct Answer :   √2 T

133 .
Energy may be defined as_____.
A)  rate of doing work
B)  power of doing work
C)  capacity of doing work
D)  All of the above

Correct Answer :   capacity of doing work

134 .
In simple harmonic motion, acceleration of a particle is proportional to_______.
A)  velocity
B)  direction
C)  rate of change of velocity
D)  displacement

Correct Answer :   displacement

135 .
A heavy ladder resting on a floor and against a vertical wall may not be in equilibrium, if_____.
A)  floor is rough and the wall is smooth
B)  floor and wall both are smooth surfaces
C)  floor is smooth and the wall is rough
D)  floor and wall both are rough surfaces

Correct Answer :   floor and wall both are smooth surfaces

136 .
If two forces acting at a point are in equilibrium, they must be equal in magnitude and their line of action must be along_____.
A)  the same line in the same sense
B)  the same line in opposite sense
C)  the perpendicular to both the lines
D)  All of the above

Correct Answer :   the same line in opposite sense

137 .
For lifting a load of 50 kg through a distance of 2.5 cm, an effort of 12.5 kg is moved through a distance of 40 cm. The efficiency of the lifting machine, is____.
A)  25%
B)  60%
C)  65%
D)  70%

Correct Answer :   25%

138 .
Power can be expressed as____.
A)  work x time
B)  work/energy
C)  work/time
D)  work/distance

Correct Answer :   work/time

139 .
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)  5.0 cm
B)  5.25 cm
C)  5.5 cm
D)  6.5 cm

Correct Answer :   5.0 cm

140 .
The unit of moments in M.K.S system, is______.
A)  kg/sec²
B)  kg/m²
C)  kg/sec
D)  kgm

Correct Answer :   kgm

141 .
The rotational velocity of a satellite is increased by 450 m per second if its launch is done from equator_____.
A)  westward
B)  eastward
C)  northward
D)  southward

Correct Answer :   eastward

142 .
When a body falls freely under gravitational force, it possesses____.
A)  no weight
B)  minimum weight
C)  maximum weight
D)  no effect on its weight

Correct Answer :   no weight

143 .
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)  Second's pendulum
C)  compour pendulum
D)  None of the Above

Correct Answer :   compour pendulum

144 .
The piston of a steam engine moves with a simple harmonic motion. The crank rotates 120 r.p.m. and the stroke length is 2 metres. The linear velocity of the piston when it is at a distance of 0.5 metre from the centre, is____.
A)  3.88 m/sec
B)  5.88 m/sec
C)  8.88 m/sec
D)  10.88 m/sec

Correct Answer :   10.88 m/sec

145 .
The centre of gravity of a triangle is at the point where three____.
A)  medians of the triangle meet
B)  bisectors of the angle of the triangle meet
C)  perpendicular bisectors of the sides of the triangle meet
D)  None of the Above

Correct Answer :   medians of the triangle meet

146 .
The forces which meet at one point and have their lines of action in different planes are called____.
A)  intersecting forces
B)  non-coplaner concurrent forces
C)  coplaner non-concurrent forces
D)  non-coplaner non-current forces

Correct Answer :   non-coplaner concurrent forces

147 .
In a simple screw jack, the pitch of the screw is 9 mm and length of the handle operating the screw is 45 cm. The velocity ratio of the system is___.
A)  1.5
B)  25
C)  314
D)  None of the Above

Correct Answer :   314

148 .
To double the period of oscillation of a simple pendulum____.
A)  its length should be doubled
B)  the mass of its bob should be doubled
C)  its lenght should be quadrupled
D)  the mass of its bob should be quadrupled

Correct Answer :   its lenght should be quadrupled

149 .
For a particle moving with a simple harrmonic motion, the frequency is______.
A)  directly proportional to periodic time
B)  directly proportional to its angular velocity
C)  inversely proportional to its angular velocity
D)  inversely proportional to periodic time

Correct Answer :   inversely proportional to periodic time

150 .
One half of a vibration of a body, is called_____.
A)  beat
B)  amplitude
C)  oscillation
D)  period time

Correct Answer :   beat

151 .
On a ladder resisting on a smooth ground and leaning against a rough vertical wall, the force of friction acts____.
A)  downwards at its upper end
B)  upwards at its upper end
C)  towards the wall at its upper end
D)  away from the wall at its upper end

Correct Answer :   upwards at its upper end

152 .
The acceleration of a particle moving along the circumference of a circle with a uniform speed, is directed_______.
A)  radially
B)  towards the centre
C)  away from the centre
D)  tangentially at that point

Correct Answer :   tangentially at that point

153 .
A sphere is resting on two planes BA and BC which are inclined at 45° and 60° respectively with the horizontal. The reaction on the plane BA will be____.
A)  zero
B)  less than that on BC
C)  more than that of BC
D)  equal to that on BC

Correct Answer :   more than that of BC

154 .
A projectile is fired at an angle θ to the vertical. Its horizontal range will be maximum when θ is____.
A)  0°
B)  30°
C)  45°
D)  60°

Correct Answer :   45°

155 .
A spring scale in a stationary lift shows a reading of 60 kg for a man standing on it. If the lift starts descending at an acceleration of g/5, the scale reading would be____.
A)  48 kg
B)  60 kg
C)  72 kg
D)  None of the Above

Correct Answer :   48 kg

156 .
The resolved part of the resultant of two forces inclined at an angle θ in a given direction is_____.
A)  sum of the forces multiplied by the sine θ
B)  algebraic sum of the resolved parts of the forces in the direction
C)  difference of the forces multiplied by cosine θ°
D)  arithmetical sum of the resolved parts of the forces in the direction

Correct Answer :   algebraic sum of the resolved parts of the forces in the direction

157 .
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 the Above

Correct Answer :   400 watts

158 .
According to Law of Triangle of Forces_____.
A)  three forces acting along the sides of a triangle are always in equilibrium
B)  three forces acting at a point, can be rep-resented by the sides of a triangle, each side being in proportion to the force
C)  if three forces acting at a point are in equilibrium each force is proportional to the sine of the angle between the other two
D)  All of the aboif the forces acting on a particle be represented in magnitude and direction by the two sides of a triangle taken in order, their resultant will be represented in magnitude and direction by the third side of the triangle, taken in opposite order.ve

Correct Answer :   if the forces acting on a particle be represented in magnitude and direction by the two sides of a triangle taken in order, their resultant will be represented in magnitude and direction by the third side of the triangle, taken in opposite order.

159 .
The following is not a law of static friction :
A)  The force of friction is dependent upon the area of contact
B)  The force of friction depends upon the roughness of the surface
C)  The force of friction always acts in a direction opposite to that in which the body tends to move
D)  The magnitude of the limiting friction bears a constant ratio to the normal reaction between two surfaces

Correct Answer :   The force of friction always acts in a direction opposite to that in which the body tends to move

160 .
The velocity of a moving body, is______.
A)  a scalar quantity
B)  a vector quantity
C)  a scalar as well as a vector quantity
D)  None of the Above

Correct Answer :   a vector quantity

161 .
At a given instant ship A is travelling at 6 km/h due east and ship B is travelling at 8 km/h due north. The velocity of B relative to A is_____.
A)  2 km/hrs
B)  7 km/hrs
C)  10 km/hrs
D)  14 km/hrs

Correct Answer :   10 km/hrs

162 .
The locus of the instantaneous centre of a moving rigid body, is__________.
A)  centroid
B)  spiral
C)  involute
D)  straight line

Correct Answer :   centroid

163 .
A load of 500 kg was lifted through a distance of 13 cm. by an effort of 25 kg which moved through a distance of 650 cm. The mechanical advantage of the lifting machine is______.
A)  26
B)  20
C)  18
D)  15

Correct Answer :   20

164 .
A retarding force on a body does not_________.
A)  change the motion of the body
B)  retard the motion of the body
C)  introduce the motion of the body
D)  None of the Above

Correct Answer :   retard the motion of the body

165 .
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)  1.0 cm
D)  0.5 cm

Correct Answer :   0.5 cm

166 .
The force which produces an acceleration of 1 m/sec² in a mass of one kg, is called
A)  erg
B)  dyne
C)  Netwon
D)  joule

Correct Answer :   Netwon

167 .
For maximum range of a projectile, the angle of projection should be_____.
A)  30°
B)  45°
C)  60°
D)  None of the Above

Correct Answer :   45°

168 .
A particle moves with a velocity of 2 m/sec in a straight line with a negative acceleration of 0.1 m/sec². Time required to traverse a distance of 1.5 m, is____.
A)  20 sec
B)  30 sec
C)  40 sec
D)  50 sec

Correct Answer :   20 sec

169 .
The resultant of the forces acting on a body will be zero if the body____
A)  rotates
B)  moves along a curved path
C)  moves with variable velocity in a straight line
D)  does not move at all

Correct Answer :   does not move at all

170 .
The frequency of oscillation on moon as compared to that on earth, will be_____.
A)  2.44 times less
B)  2.44 times more
C)  3 times less
D)  3 times more

Correct Answer :   2.44 times less

171 .
Moment of interia of a squares of side fa about an axis through its centre of gravity, is____.
A)  b³/4
B)  b⁴/8
C)  b⁴/12
D)  b⁴/36

Correct Answer :   b⁴/12

172 .
When a body slides down an inclined surface, the acceleration (f) of the body, is given by_____.
A)  f = g
B)  f = g sin θ
C)  f = g cos θ
D)  f = g tan θ

Correct Answer :   f = g sin θ

173 .
The velocity ratio of an inclined plane of inclination θ with horizontal for lifting a load is_____.
A)  cos θ
B)  sin θ
C)  tan θ
D)  cosec θ

Correct Answer :   cosec θ

174 .
Pick up the incorrect statement from the following. In a simple harmonic motion____.
A)  acceleration is zero at the mean position
B)  velocity is maximum at its mean position
C)  velocity is minimum at the end of the storke
D)  acceleration is minimum at the end of the stroke

Correct Answer :   acceleration is minimum at the end of the stroke

175 .
The point about which combined motion of rotation and translation of a rigid body takes place, is known as____.
A)  Virtual centre
B)  Point of rotation
C)  Instantaneous centre
D)  Instantaneous axis

Correct Answer :   Instantaneous centre

176 .
A ball moving with a velocity of 5 m/sec impinges a fixed plane at an angle of 45° and its direction after impact is equally inclined to the line of impact. If the coefficient of restitution is 0.5, the velocity of the ball after impact will be___.
A)  2.5 m/sec
B)  0.5 m/sec
C)  1.5 m/sec
D)  3.5 m/sec

Correct Answer :   2.5 m/sec

177 .
The distance of the c.g. of a semi-circular arc of radius r from its diameter along the radius of symmetry, is_____
A)  2π / r
B)  2π / π
C)  2r / 3π
D)  3r / π

Correct Answer :   2π / π

178 .
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

Correct Answer :   2.0 beats per second

179 .
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 reaction between the sphere and the wall of the arrangement made is___.
A)  102.5 kg
B)  105.5 kg
C)  108.5 kg
D)  110 kg

Correct Answer :   102.5 kg

180 .
Effect of a force on a body depends upon its____.
A)  position
B)  magnitude
C)  direction
D)  All of the above

Correct Answer :   All of the above

181 .
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)  22 m/sec
B)  20 m/sec
C)  18 m/sec
D)  16 m/sec

Correct Answer :   20 m/sec

182 .
A point subjected to a number of forces will be in equilibrium, if____.
A)  algebraic sum of the forces is zero
B)  two resolved parts in any two directions at right angles are equal
C)  algebraic sum of the moments of the forces about the point is zero
D)  sum of resolved parts in any two directions at right angles, are both zero

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

183 .
The centre of gravity of a plane lamina will not be at its geometrical centre if it is a___.
A)  circle
B)  rectangle
C)  equilateral triangle
D)  right angled triangle

Correct Answer :   right angled triangle

184 .
Periodic time of body moving with simple harmonic motion, is_____.
A)  inversely proportional to its angular velocity
B)  directly proportional to its angular velocity
C)  inversly proportional to the square of its angular velocity
D)  directly porportional to the square of its angular velocity

Correct Answer :   inversely proportional to its angular velocity

185 .
Newton's law of Collision of elastic bodies states that when two moving bodies collide each other, their velocity of separation___.
A)  bears a constant ratio to their velocity of approach
B)  is equal to the sum of their velocities of approach
C)  is directly proportional to their velocity of approach
D)  is inversely proportional to their velocity of approach

Correct Answer :   bears a constant ratio to their velocity of approach

186 .
Two forces of 6 Newtons and 8 Newtons which are acting at right angles to each other, will have a resultant of____
A)  5 Newtons
B)  8 Newtons
C)  10 Newtons
D)  12 Newtons

Correct Answer :   10 Newtons

187 .
A projectile is fired with a velocity of 100.3 m/sec. at an elevation of 60°. The velocity attained by the projectile when it is moving at a height of 100 m, is____.
A)  85 m/sec
B)  90 m/sec
C)  75 m/sec
D)  80 m/sec

Correct Answer :   90 m/sec

188 .
Two parallel forces 20 kg and 15 kg act. In order that the distance of the resultant from 20 kg force may be the same as that of the former resultant was from 15 kg, the 20 kg force is diminished by___.
A)  4.5 kg
B)  5.5 kg
C)  6.25 kg
D)  8.75 kg

Correct Answer :   8.75 kg

189 .
If two equal forces of magnitude P act at an angle θ, their resultant, will be____.
A)  P sin θ/2
B)  P cos θ/2
C)  2P sin θ/2
D)  2P cos θ/2

Correct Answer :   2P cos θ/2

190 .
A geo-stationary satellite is one which orbits the earth with a velocity of rotation of____.
A)  earth
B)  sun
C)  moon
D)  None of the Above

Correct Answer :   earth

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