1. If three forces acting at a point be represented in magnitude and direction by the three sides of a triangle, taken in order, the forces shall be in equilibrium.
Correct : A. TRUE
2. In order to double the period of simple pendulum, the length of the string should be
Correct : C. quadrupled
3. The unit of angular acceleration is
Correct : D. rad / s2
4. The loss of kinetic energy due to direct impact of two bodies
Correct : A. depends
5. If a given force (or a given system of forces) acting on a body
Correct : B. does not change
6. For any system of coplaner forces, the condition of equilibrium is that the
Correct : D. all of the above
7. 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
Correct : B. 100
8. In actual machines, mechanical advantage is
Correct : B. less than
9. The angle of inclination of the plane at which the body begins to move down the plane, is called
Correct : A. angle of friction
10. The minimum force required to slide a body of weight W on a rough horizontal plane is
Correct : C. W tan ?
11. The range of projectile on a downward inclined plane is
Correct : B. more than
12. The forces, whose lines of action are parallel to each other and act in the same directions, are known as
Correct : C. like parallel forces
13. The distance, between the point of projection and the point where the projectile strikes the ground, is known as range.
Correct : A. Correct
14. 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
Correct : D. none of these
15. The impact between two lead spheres is approximately equal to an
Correct : B. inelastic
16. The angle of the inclined plane at which a body just begins to slide down the plane, is called helix angle.
Correct : B. False
17. The total energy possessed by a system of moving bodies
Correct : A. is constant at every instant
18. Moment of inertia of a circular section about an axis perpendicular to the section is
Correct : C. ?d4 / 32
19. A couple produces
Correct : B. rotational motion
20. A non-reversible machine is also called a self-locking machine
Correct : A. Agree
21. A body will begin to move down an inclined plane if the angle of inclination of the plane is
Correct : C. greater than
22. Which of the following statement is wrong?
Correct : D. The velocity ratio of a machine is the ratio of load lifted to the effort applied.
23. 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
Correct : B. compound pendulum
24. A smooth cylinder lying on its convex surface remains in
Correct : B. unstable
25. A machine having an efficiency less than 50%, is known as
Correct : B. non-reversible machine
26. A framed structure is perfect, if the number of members are
Correct : A. equal to
27. A ladder is resting on a rough ground and leaning against a smooth vertical wall. The force of friction will act
Correct : C. zero at its upper end
28. All the steel trusses of the bridges, have one of their end roller supported, and other end hinged. The main advantage of such a support is that the truss remains stable.
Correct : A. True
29. The force required to move the body up the plane will be minimum if it makes an angle with the inclined plane
Correct : A. equal to
30. One watt is equal to
Correct : B. 1 joule / s
31. Vectors method for the resultant force is also called polygon law of forces.
Correct : A. Correct
32. The acceleration of a particle moving with simple harmonic motion, at any instant is given by
Correct : B. ?2.y
33. The power developed by a body acted upon by a torque T newton metre (N - m) and revolving at ? radian / s is given by
Correct : A. T.? (in watts)
34. The centre of gravity of a hemisphere lies at a distance of 3r / 8 from its base measured along the vertical radius.
Correct : A. Right
35. The friction experienced by a body, when at rest, is known as
Correct : A. static friction
36. The centre of percussion is below the centre of gravity of the body and is at a distance equal to
Correct : C. k2G / h
37. A smooth cylinder lying on a
Correct : C. horizontal surface
38. The unit of moment of inertia of an area is
Correct : D. m4
39. A machine which is capable of doing work in the reversed direction, after the effort is re-moved, is called a non-reversible machine.
Correct : B. No
40. The force applied on a body of mass 100 kg to produce an acceleration of 5 m/s2, is
Correct : C. 500N
41. A machine which is capable of doing any work in the reversed direction, after the effort is removed, is called a reversible machine.
Correct : B. False
42. The velocity ratio of a simple wheel and axle with D and d as the diameters of effort wheel and load axle, is
Correct : D. D / d
43. The centre of oscillation and centre of suspension for a compound pendulum are interchangeable.
Correct : A. True
44. The term 'force' may be defined as an agent which produces or tends to produce, destroys or tends to destroy motion
Correct : A. Agree
45. The acceleration of a particle moving with simple harmonic motion is proportional to the displacement of the particle from the mean position.
Correct : A. True
46. 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
Correct : A. True
47. If the resultant of two equal forces has the same magnitude as either of the forces, then angle between the two forces is
Correct : D. 120?
48. The motion of a particle round a fixed axis is
Correct : C. circular
49. According to Newton's first law of motion,
Correct : A. every body continues in its state of rest or of uniform motion, in a straight line, unless it is acted upon by some external force
50. Two equal and opposite parallel forces whose lines of action are different, can be replaced by a single force parallel to the given forces
Correct : B. Incorrect
51. Non-coplaner non-concurrent forces are those forces which
Correct : B. do not meet at one point and their lines of action do not lie on the same plane
52. A machine having an efficiency greater than 50%, is known as
Correct : A. reversible machine
53. The time taken by a particle for one complete oscillation is known as periodic time.
Correct : A. Agree
54. The centre of gravity of a right circular solid cone is at a distance of
Correct : C. h / 4
55. In order to determine the effects of a force, acting on a body, we must know
Correct : D. all of the above
56. The ratio of static friction to dynamic friction is always
Correct : C. greater than one
57. Two equal and opposite parallel forces whose lines of action are different form a couple.
Correct : A. Right
58. The range of a projectile is maximum, when the angle of projection is
Correct : B. 45?
59. The mechanical advantage of a lifting machine is the ratio of
Correct : B. load lifted to the effort applied
60. Moment of inertia of a circular section about its diameter (d) is
Correct : D. ?d4 / 64
61. The total motion possessed by a body, is called
Correct : D. momentum
62. Which of the following are vector quantities?
Correct : D. all of these
63. The radius of gyration is the distance where the whole mass (or area) of a body is assumed to be concentrated.
Correct : A. Correct
64. A weight of 1000 N can be lifted by an effort of 80 N. If the velocity ratio is 20, the machine is
Correct : A. reversible
65. A lifting machine lifts a load of 1000N through a distance of 0.2 m by means of an effort of 200N through a distance of 1m. This machine is an ideal one.
Correct : A. Right
66. The velocity ratio of a single purchase crab winch can be increased by
Correct : A. increasing the length of the handle
67. When two elastic bodies collide with each other,
Correct : D. all of the above
68. Moment of inertia is the
Correct : D. all of these
69. The force which acts along the radius of a circle and directed away from the centre of the circle is called centrifugal force
Correct : A. Agree
70. When a person, on a bicycle, drives round a curve, he has to lean
Correct : A. inward
71. The bodies which rebound after impact are called
Correct : B. elastic bodies
72. If the number of pulleys in a system is equal to its velocity ratio, then it is a
Correct : B. second
73. The energy possessed by a body, for doing work by virtue of its position, is called
Correct : A. potential energy
74. The matter contained in a body, is called
Correct : B. mass
75. The motion of a wheel of a car is
Correct : C. combined translation and rotational
76. The resultant of the two forces P and Q is R. If Q is doubled, the new resultant is perpendicular to P. Then
Correct : B. Q = R
77. Moment of inertia of a triangular section of base (b) and height (h) about an axis through its base, is
Correct : C. bh3 / 12
78. According to lami's theorem
Correct : D. if the three forces acting at a point are in equilibrium, then each force is proportional to the sine of the angle between the other two
79. The centre of gravity of a rectangle lies at a point where its two diagonals meet each other.
Correct : A. Agree
80. A pendulum which executes one beat per second is known as
Correct : D. second's pendulum
81. 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
Correct : B. principle of resolution of forces
82. Which of the fololowing statement is correct in connection with projectiles?
Correct : D. all of the above
83. The angle of inclination with the vertical is
Correct : A. more
84. The centre of gravity of an equilateral triangle with each side a, is
Correct : C. a/2 ?3
85. In a screw jack, the effort required to lift the load is given by. Where W = Load lifted, ? = Helix angle, and ? = Angle of friction
Correct : B. P = W tan (? + ?)
86. Static friction is always
Correct : C. greater than
87. If a number of forces acting at a point be represented in magnidude and direction by the three sides of a triangle, taken in order, then the forces are not in equilibrium
Correct : B. Disagree
88. One joule means that
Correct : A. work is done by a force of 1 N when it displaces a body through 1 m
89. The velocity ratio for the third system of pulleys is
Correct : D. 2n - 1
90. 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
Correct : B. 2 m
91. 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
Correct : B. twice the area of the triangle
92. 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
Correct : D. bh3 / 36
93. The triangle law of forces states that if two forces acting simultaneously on a particle, be represented in magnitude and direction by the two sides of a triangle taken in order, then their resultant may be represented in mangnitude and direction by the third side of of a triangle, taken in opposite order.
Correct : A. TRUE
94. The friction experienced by a body, when in motion, is known as
Correct : B. dynamic friction
95. The forces, which do not meet at one point, but their lines of action lie on the same plane, are known as coplaner concurrent forces
Correct : A. Agree
96. A redundant frame is also called
Correct : B. imperfect
97. The process of finding out the resultant force is called
Correct : A. composition
98. 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
Correct : B. the change in momentum suffered by rubber ball is more than the lead balf
99. The centre of gravity of a semi-circle lies at a distance of
Correct : B. 4r/3?
100. The velocity ratio of a first system of pulleys with 4 pulleys is