MCQOPTIONS
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MCQOPTIONS
This section includes 83 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering Mechanics knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
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 |
| A. | less than |
| B. | greater than |
| Answer» C. | |
| 52. |
The velocity ratio in case of an inclined plane inclined at angle ? to the horizontal and weight being pulled up the inclined plane by vertical effort is |
| A. | sin ? |
| B. | cos ? |
| C. | tan ? |
| D. | cosec ? |
| Answer» B. cos ? | |
| 53. |
The force required to move the body up the plane will be minimum if it makes an angle with the inclined plane |
| A. | equal to |
| B. | less than |
| C. | greater than |
| Answer» B. less than | |
| 54. |
Two like parallel forces are acting at a distance of 24 mm apart and their resultant is 20 N. If 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. | 20 N and 5 N |
| C. | 15 N and 10 N |
| D. | none of these |
| Answer» B. 20 N and 5 N | |
| 55. |
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. | 20N |
| B. | 40N |
| C. | 40N |
| D. | none of these |
| Answer» B. 40N | |
| 56. |
A resultant force is a single force which produces the same effect as produced by all the given forces acting on a body |
| A. | TRUE |
| B. | FALSE |
| Answer» B. FALSE | |
| 57. |
If the resultant of two equal forces has the same magnitude as either of the forces, then angle between the two forces is |
| A. | 30? |
| B. | 60? |
| C. | 90? |
| D. | 120? |
| Answer» E. | |
| 58. |
If the efficiency of a lifting machine is kept constant, its velocity ratio is |
| A. | directly |
| B. | inversely |
| Answer» B. inversely | |
| 59. |
If the resultant of a number of forces acting on a body is zero, then the body will not be in equilibrium |
| A. | Yes |
| B. | No |
| Answer» C. | |
| 60. |
If three forces acting at a point are represented in magnitude and direction by the three sides of a triangle, taken in order, then the forces are in equilibrium |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 61. |
When a body of mass moment of inertia / (about a given axis) is rotated about that axis with an angular velocity ?, then the kinetic energy of rotation is |
| A. | I ? |
| B. | I ?2 |
| C. | 0.5 I ? |
| D. | 0.5 I ?2 |
| Answer» E. | |
| 62. |
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 |
| A. | nine times |
| B. | six times |
| C. | four times |
| D. | two times |
| Answer» B. six times | |
| 63. |
A machine which is capable of doing any work in the reversed direction, after the effort is removed, is called a reversible machine. |
| A. | True |
| B. | False |
| Answer» C. | |
| 64. |
A machine which is capable of doing work in the reversed direction, after the effort is re-moved, is called a non-reversible machine. |
| A. | Yes |
| B. | No |
| Answer» C. | |
| 65. |
The moment of inertia of a solid cylinder of mass m, radius r and length l about the longitudenal axis or polar axis is |
| A. | mr2 / 2 |
| B. | mr2 / 4 |
| C. | mr2 / 6 |
| D. | mr2 / 8 |
| Answer» B. mr2 / 4 | |
| 66. |
The moment of inertia of a thin rod of mass m and length l, about an axis through its centre of gravity and perpendicular to its length is |
| A. | ml2 / 4 |
| B. | ml2 / 6 |
| C. | ml2 / 8 |
| D. | ml2 / 12 |
| Answer» E. | |
| 67. |
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 |
| B. | Newton's second law of motion |
| C. | principle of conservation of energy |
| D. | principle of conservation of momentum |
| Answer» E. | |
| 68. |
The power developed by a body acted upon by a torque T newton metre (N - m) and revolving at ? radian / s is given by |
| A. | T.? (in watts) |
| B. | T.? / 60 (in watts) |
| C. | T.? / 75 (in kilowatts) |
| D. | T.? / 4500 (in kilowatts) |
| Answer» B. T.? / 60 (in watts) | |
| 69. |
A smooth cylinder lying on a |
| A. | curved surface |
| B. | convex surface |
| C. | horizontal surface |
| Answer» D. | |
| 70. |
If a pendulum is taken 1 km below the earth surface in a mine, it will |
| A. | gain |
| B. | loose |
| Answer» B. loose | |
| 71. |
The acceleration of a particle moving with simple harmonic motion is |
| A. | zero |
| B. | minimum |
| C. | maximum |
| Answer» B. minimum | |
| 72. |
Tension in the cable supporting a lift is more when the lift is moving |
| A. | upwards |
| B. | downwards |
| Answer» B. downwards | |
| 73. |
The linear acceleration (a) of a body rotating along a circular path of radius (r) with an angular acceleration of ? rad / s2, is |
| A. | a = ? / r |
| B. | a = ?.r |
| C. | a = r / ? |
| D. | none of these |
| Answer» C. a = r / ? | |
| 74. |
When a particle moves along a circular path, its acceleration has two components, one is normal component and the other is tangential component of acceleration |
| A. | True |
| B. | False |
| Answer» B. False | |
| 75. |
When the lift is moving upwards with some acceleration, the pressure exerted by a man is |
| A. | directly |
| B. | inversely |
| Answer» B. inversely | |
| 76. |
The impact between two lead spheres is approximately equal to an |
| A. | elastic |
| B. | inelastic |
| Answer» C. | |
| 77. |
A body will begin to move down an inclined plane if the angle of inclination of the plane is |
| A. | equal to |
| B. | less than |
| C. | greater than |
| Answer» D. | |
| 78. |
The range of projectile on a downward inclined plane is |
| A. | less than |
| B. | more than |
| C. | equal to |
| Answer» C. equal to | |
| 79. |
If a given force (or a given system of forces) acting on a body |
| A. | change |
| B. | does not change |
| Answer» C. | |
| 80. |
The loss of kinetic energy due to direct impact of two bodies |
| A. | depends |
| B. | does not depend |
| Answer» B. does not depend | |
| 81. |
A non-reversible machine is also called a self-locking machine |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 82. |
A smooth cylinder lying on its convex surface remains in |
| A. | stable |
| B. | unstable |
| C. | neutral |
| Answer» C. neutral | |
| 83. |
In actual machines, mechanical advantage is |
| A. | equal to |
| B. | less than |
| C. | greater than |
| Answer» C. greater than | |