McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .
| 151. |
The centre of gravity of a right angled triangle lies at its geometrical centre. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 152. |
The moment of inertia of a solid cone of mass m and base radius r about its vertical axis is |
| A. | 3mr2 / 5 |
| B. | 3mr2 / 10 |
| C. | 2mr2 / 5 |
| D. | 4mr2 / 5 |
| Answer» B. 3mr2 / 10 | |
| 153. |
The amount by which the outer edge of the rail is raised, is known as super-elevation. |
| A. | Agree |
| B. | Disagree |
| Answer» A. Agree | |
| 154. |
The maximum efficiency of a lifting machine is |
| A. | 1 / m |
| B. | V.R. / m |
| C. | m / V.R. |
| D. | 1 / m x V.R. |
| Answer» D. 1 / m x V.R. | |
| 155. |
Which of the following statement is correct? |
| A. | The algebraic sum of the forces, constituting the couple is zero. |
| B. | The algebraic sum of the forces, constituting the couple, about any point is the same. |
| C. | A couple cannot be balanced by a single force but can be balanced only by a couple of opposite sense |
| D. | all of the above |
| Answer» D. all of the above | |
| 156. |
If two bodies having masses m1 and m2 (m1 > m2) have equal kinetic energies, the momentum of body having mass m1 is |
| A. | equal to |
| B. | less than |
| C. | greater than |
| Answer» C. greater than | |
| 157. |
The rate of doing work is known as |
| A. | potential energy |
| B. | kinetic energy |
| C. | power |
| D. | none of these |
| Answer» C. power | |
| 158. |
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» A. meet at one point, but their lines of action do not lie on the same plane | |
| 159. |
According to principle of conservation of energy, the total momentum of a system of masses in any direction remains constant unless acted upon by an external force in that direction. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 160. |
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» D. principle of conservation of momentum | |
| 161. |
The unit of force in S.I. system of units of |
| A. | dyne |
| B. | kilogram |
| C. | newton |
| D. | watt |
| Answer» C. newton | |
| 162. |
Which of the following are vector quantities? |
| A. | Angular displacement |
| B. | Angular velocity |
| C. | Angular acceleration |
| D. | all of these |
| Answer» D. all of these | |
| 163. |
The loss of kinetic energy during elastic impact is zero. |
| A. | Agree |
| B. | Disagree |
| Answer» A. Agree | |
| 164. |
The centre of gravity of a triangle lies at a point where its medians intersect each other. |
| A. | True |
| B. | False |
| Answer» A. True | |
| 165. |
D' Alembert's principle basically depends upon Newton's second law of motion. |
| A. | Correct |
| B. | Incorrect |
| Answer» A. Correct | |
| 166. |
In order to completely specify angular displacement by a vector, it must fix |
| A. | direction of the axis of rotation |
| B. | magnitude of angular displacement |
| C. | sense of angular displacement |
| D. | all of these |
| Answer» D. all of these | |
| 167. |
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» A. 20N | |
| 168. |
When a particle moves along a circular path with uniform velocity, there will be no tangential acceleration. |
| A. | Correct |
| B. | Incorrect |
| Answer» A. Correct | |
| 169. |
One joule is equal to |
| A. | 0.1 N - m |
| B. | 1 N - m |
| C. | 10 N - m |
| D. | 100 N - m |
| Answer» B. 1 N - m | |
| 170. |
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» A. nine times | |
| 171. |
The kinetic energy of a body |
| A. | does not depend |
| B. | depends |
| Answer» B. depends | |
| 172. |
A newton is defined as the force while acting upon a mass of one kg, produces an acceleration of 1 m/s2 in the direction of which it acts. |
| A. | Yes |
| B. | No |
| Answer» A. Yes | |
| 173. |
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 |
| B. | P - Q |
| C. | P / Q |
| D. | Q / P |
| Answer» B. P - Q | |
| 174. |
A framed structure is imperfect, if the number of members are |
| A. | equal to |
| B. | less than |
| C. | greater than |
| D. | either (b) or (c) |
| Answer» D. either (b) or (c) | |
| 175. |
The resultant of two equal forces P making an angle ?, is given by |
| A. | 2 P sin ?/2 |
| B. | 2 P cos ? / 2 |
| C. | 2 P tan ?/2 |
| D. | 2 P cot ?/2 |
| Answer» B. 2 P cos ? / 2 | |
| 176. |
The unit of mass moment of intertia in S.I. units is kg - m2 |
| A. | True |
| B. | False |
| Answer» A. True | |
| 177. |
When a body falls freely under gravitational force, it possesses |
| A. | no |
| B. | minimum |
| C. | maximum |
| Answer» A. no | |
| 178. |
The potential energy of a vertically raised body is |
| A. | equal to |
| B. | less than |
| C. | greater than |
| Answer» A. equal to | |
| 179. |
The moment of inertia of a square of side a about its base is a4 / 3 |
| A. | True |
| B. | False |
| Answer» A. True | |
| 180. |
The forces which meet at one point, but their lines of action |
| A. | lie |
| B. | do not lie |
| Answer» B. do not lie | |
| 181. |
The amplitude is always |
| A. | equal to |
| B. | less than |
| C. | greater than |
| Answer» A. equal to | |
| 182. |
The static friction |
| A. | bears a constant ratio to the normal reaction between the two surfaces |
| B. | is independent of the area of contact, between the two surfaces |
| C. | always acts in a direction, opposite to that in which the body tends to move |
| D. | all of the above |
| Answer» D. all of the above | |
| 183. |
A lift moves downwards with an acceleration of 9.8 m/s2. The pressure exerted by a man on the floor of the lift is zero. |
| A. | True |
| B. | False |
| Answer» A. True | |
| 184. |
One kg force is equal to |
| A. | 7.8 N |
| B. | 8.9 N |
| C. | 9.8 N |
| D. | 12 N |
| Answer» C. 9.8 N | |
| 185. |
A force acting in the opposite direction to the motion of the body is called force of friction. |
| A. | Agree |
| B. | Disagree |
| Answer» A. Agree | |
| 186. |
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 |
| Answer» A. mr2 / 2 | |
| 187. |
If the body falls freely under gravity, then the gravitational acceleration is taken as |
| A. | Plus 8.9 m/s2 |
| B. | ? 8.9 m/s2 |
| C. | Plus 9.8 m/s2 |
| D. | ? 9.8 m/s2 |
| Answer» C. Plus 9.8 m/s2 | |
| 188. |
Mass moment of inertia of a thin rod about its one end is |
| A. | same as |
| B. | twice |
| C. | thrice |
| D. | four times |
| Answer» D. four times | |
| 189. |
Newton's second law motion |
| A. | gives |
| B. | does not give |
| Answer» A. gives | |
| 190. |
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» C. minimum, if it acts at the centre of gravity of the body | |
| 191. |
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» D. 0.5 I ?2 | |
| 192. |
The unit of work in S.I. units is |
| A. | newton |
| B. | erg |
| C. | kg-m |
| D. | joule |
| Answer» D. joule | |
| 193. |
In a screw jcak, the effort required to lower the load is |
| A. | less than |
| B. | equal to |
| C. | more than |
| Answer» A. less than | |
| 194. |
The terms 'leverage' and 'mechanical advantage' of a compound lever have got the same meaning. |
| A. | Right |
| B. | Wrong |
| Answer» A. Right | |
| 195. |
An ideal machine is one whose efficiency is |
| A. | between 60 to 70% |
| B. | between 70 to 80% |
| C. | between 80 to 90% |
| D. | 100% |
| Answer» D. 100% | |
| 196. |
Tension in the cable supporting a lift is more when the lift is moving |
| A. | upwards |
| B. | downwards |
| Answer» A. upwards | |
| 197. |
When the lift is moving upwards with some acceleration, the pressure exerted by a man is |
| A. | directly |
| B. | inversely |
| Answer» A. directly | |
| 198. |
If a body is thrown upwards, then the gravitational acceleration is taken as zero. |
| A. | Right |
| B. | Wrong |
| Answer» B. Wrong | |
| 199. |
The length of a second's pendulum is |
| A. | 94.9 cm |
| B. | 99.4 cm |
| C. | 100 cm |
| Answer» B. 99.4 cm | |
| 200. |
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 |
| Answer» D. the algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point | |
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