MCQOPTIONS
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MCQOPTIONS
This section includes 606 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
The centre of gravity of a triangle lies at a point where its medians intersect each other. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 102. |
In order to double the period of simple pendulum, the length of the string should be |
| A. | halved |
| B. | doubled |
| C. | quadrupled |
| Answer» D. | |
| 103. |
The moment of inertia of a square of side about its base is / 3. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 104. |
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 |
| Answer» C. third | |
| 105. |
The velocity ratio for the second system of pulleys is . |
| A. | True |
| B. | False |
| Answer» B. False | |
| 106. |
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 these |
| Answer» D. none of these | |
| 107. |
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 | |
| 108. |
A machine which is not 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. | |
| 109. |
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 |
| Answer» D. 60° + β/2 | |
| 110. |
The resultant of two forces and (such that > ) acting along the same straight line, but in opposite direction, is given by |
| A. | + |
| B. | - |
| C. | / |
| D. | / |
| Answer» C. / | |
| 111. |
The principle of transmissibility of forces states that, when a force acts upon a body, its effect is |
| A. | same at every point on its line of action |
| B. | different at different points on its line of action |
| C. | minimum, if it acts at the centre of gravity of the body |
| D. | maximum, if it acts at the centre of gravity of the body |
| Answer» D. maximum, if it acts at the centre of gravity of the body | |
| 112. |
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. | 20 |
| D. | 40 |
| Answer» C. 20 | |
| 113. |
The process of finding out the resultant force is called __________ of forces. |
| A. | composition |
| B. | resolution |
| Answer» B. resolution | |
| 114. |
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 |
| Answer» B. less than | |
| 115. |
If a number of forces acting at a point be represented in magnitude and direction by the three sides of a triangle, taken in order, then the forces are not in equilibrium. |
| A. | Agree |
| B. | Disagree |
| Answer» C. | |
| 116. |
The periodic time of a particle with simple harmonic motion is __________ proportional to the angular velocity. |
| A. | directly |
| B. | inversely |
| Answer» C. | |
| 117. |
The motion of a particle round a fixed axis is |
| A. | translatory |
| B. | rotary |
| C. | circular |
| D. | translatory as well as rotatry |
| Answer» D. translatory as well as rotatry | |
| 118. |
If a given force (or a given system of forces) acting on a body __________ the position of the body, but keeps it in equilibrium, then its effect is to produce internal stress in the body. |
| A. | change |
| B. | does not change |
| Answer» C. | |
| 119. |
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 | |
| 120. |
Newton's second law motion __________ a relation between force and mass of a moving body. |
| A. | gives |
| B. | does not give |
| Answer» B. does not give | |
| 121. |
A lift moves downwards with an acceleration of 9.8 m/s. The pressure exerted by a man on the floor of the lift is zero. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 122. |
Non-coplaner concurrent forces are those forces which |
| A. | meet at one point, but their lines of action do not lie on the same plane |
| B. | do not meet at one point and their lines of action do not lie on the same plane |
| C. | meet at one point and their lines of action also lie on the same plane |
| D. | do not meet at one point, but their lines of action lie on the same plane |
| Answer» B. do not meet at one point and their lines of action do not lie on the same plane | |
| 123. |
In a framed structure, as shown in the below figure, the force in the member is numerically equal to the force in member . |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 124. |
The force which acts along the radius of a circle and directed towards the centre of the circle is known as centripetal force. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 125. |
Moment of inertia of a triangular section of base () and height () about an axis through its base, is |
| A. | /4 |
| B. | /8 |
| C. | / 12 |
| D. | / 36 |
| Answer» D. / 36 | |
| 126. |
According to the law of moments, 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. |
| Answer» D. the algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point. | |
| 127. |
The unit of mass moment of inertia in S.I. units is kg-m. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 128. |
A newton is defined as the force while acting upon a mass of one kg, produces an acceleration of 1 m / s in the direction of which it acts. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 129. |
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 |
| Answer» C. | |
| 130. |
When a train is rounding a curve, the side thrust on the wheel flanges is prevented by raising the outer edge of the rail. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 131. |
Frequency of vibrations means the number of cycles per second. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 132. |
If the efficiency of a lifting machine is kept constant, its velocity ratio is __________ propotional to its mechanical advantage. |
| A. | directly |
| B. | inversely |
| Answer» B. inversely | |
| 133. |
A screw jack used for lifting the loads is |
| A. | a reversible machine |
| B. | a non-reversible machine |
| C. | an ideal machine |
| D. | none of these |
| Answer» C. an ideal machine | |
| 134. |
Non-coplaner non-concurrent forces are those forces which |
| A. | meet at one point, but their lines of action do not lie on the same plane |
| B. | do not meet at one point and 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. | none of the above |
| Answer» C. do not meet at one point but their lines of action lie on the same plane | |
| 135. |
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 |
| Answer» C. | |
| 136. |
A force while acting on a body may |
| A. | change its motion |
| B. | balance the forces, already acting on it |
| C. | give rise to the internal stresses in it |
| D. | all of these |
| Answer» E. | |
| 137. |
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 |
| Answer» E. | |
| 138. |
The negative acceleration is called retardation. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 139. |
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. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 140. |
Two blocks and of masses 150 kg and 50 kg respectively are connected by means of a string as shown in the below figure. The tension in all the three strings __________ be same. |
| A. | will |
| B. | will not |
| Answer» B. will not | |
| 141. |
D' Alembert's principle basically depends upon Newton's second law of motion. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 142. |
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. | coplaner non-concurrent forces |
| C. | like parallel forces |
| D. | unlike parallel forces |
| Answer» D. unlike parallel forces | |
| 143. |
A number of forces acting at a point will be in equilibrium, if |
| A. | all the forces are equally inclined |
| B. | sum of all the forces is zero |
| C. | sumof resolved parts in the vertical direction is zero (i.e. ∑ |
| D. | = 0) |
| E. | none of these |
| Answer» D. = 0) | |
| 144. |
The kinetic energy of a body __________ upon its mass and velocity. |
| A. | does not depend |
| B. | depends |
| Answer» C. | |
| 145. |
According to Newton's first law of motion, |
| A. | every body continues in its state of rest or of uniform motion, in a straight line, unless it is acted upon by some external force |
| B. | the rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction, in which the force acts |
| C. | to every action, there is always an equal and opposite reaction |
| D. | none of the above |
| Answer» B. the rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction, in which the force acts | |
| 146. |
The moment of inertia of a square of side () about an axis through its centre of gravity is |
| A. | /4 |
| B. | /8 |
| C. | /12 |
| D. | /36 |
| Answer» D. /36 | |
| 147. |
The motion of a wheel of a car is |
| A. | purely translation |
| B. | purely rotational |
| C. | combined translation and rotational |
| D. | none of these |
| Answer» D. none of these | |
| 148. |
For any system of coplaner forces, the condition of equilibrium is that the |
| A. | algebraic sum of the horizontal components of all the forces should be zero |
| B. | algebraic sum of the vertical components of all the forces should be zero |
| C. | algebraic sum of moments of all the forces about any point should be zero |
| D. | all of the above |
| Answer» E. | |
| 149. |
A science teacher claimed that Newton's third law of motion is involved while studying the motion of rockets. His statement is |
| A. | justified |
| B. | not justified |
| Answer» B. not justified | |
| 150. |
One kg force is equal to |
| A. | 7.8 N |
| B. | 8.9 N |
| C. | 9.8 N |
| D. | 12 N |
| Answer» D. 12 N | |