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.
| 151. |
Coefficient of friction depends upon |
| A. | area of contact only |
| B. | nature of surface only |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» C. both (a) and (b) | |
| 152. |
The moment of inertia of a thin rod of mass and length ,about an axis through its centre of gravity and perpendicular to its length is |
| A. | /4 |
| B. | / 6 |
| C. | /8 |
| D. | /12 |
| Answer» E. | |
| 153. |
When a body of mass attains a velocity from rest in time , then the kinetic energy of translation is |
| A. | 0.5 |
| B. | 0.5 |
| Answer» D. | |
| 154. |
In collision of elastic bodies, the coefficient of restitution is the ratio of the relative velocity after impact to the relative velocity before impact. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 155. |
The acceleration of a particle moving with simple harmonic motion is proportional to the displacement of the particle from the mean position. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 156. |
The unit of moment of inertia of an area is |
| A. | kg-m |
| B. | kg-m-s |
| C. | kg/m |
| D. | m |
| Answer» E. | |
| 157. |
The force induced in the string due to the load , as shown in the below figure is |
| A. | sin θ |
| B. | cos θ |
| C. | sec θ |
| D. | cosec θ |
| Answer» E. | |
| 158. |
A spherical body is symmetrical about its perpendicular axis. According to Routh's rule, the moment of inertia of a body about an axis passing through its centre of gravity is(where, = Mass of the body, and = Sum of the squares of the two semi-axes.) |
| A. | /3 |
| B. | /4 |
| C. | /5 |
| D. | none of these |
| Answer» D. none of these | |
| 159. |
The efficiency of a lifting machine is the ratio of |
| A. | output to the input |
| B. | work done by the machine to the work done on the machine |
| C. | mechanical advantage to the velocity ratio |
| D. | all of the above |
| Answer» E. | |
| 160. |
A ladder is resting on a smooth ground and leaning against a rough vertical wall. The force of friction will act |
| A. | towards the wall at its upper and |
| B. | away from the wall at its upper end |
| C. | downward at its upper end |
| D. | upward at its upper end |
| Answer» E. | |
| 161. |
The slope on the road surface generally provided on the curves is known as |
| A. | angle of friction |
| B. | angle of repose |
| C. | angle of banking |
| D. | none of these |
| Answer» D. none of these | |
| 162. |
Coplaner non-concurrent forces are those forces which __________ at one point, but their lines of action lie on the same plane. |
| A. | meet |
| B. | do not meet |
| Answer» C. | |
| 163. |
The moment of inertia of a rectangular section 3cm wide and 4cm deep about - axis is |
| A. | 9cm |
| B. | 12cm |
| C. | 16cm |
| D. | 20cm |
| Answer» D. 20cm | |
| 164. |
The velocity ratio of a simple wheel and axle with and as the diameters of effort wheel and load axle, is |
| A. | + |
| B. | - |
| C. | x |
| D. | / |
| Answer» E. | |
| 165. |
A body is said to move or vibrate with simple harmonic motion if its acceleration is directed towards the mean position. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 166. |
A ladder is resting on a rough ground and leaning against a smooth vertical wall. The force of friction will act |
| A. | downward at its upper end |
| B. | upward at its upper end |
| C. | zero at its upper end |
| D. | perpendicular to the wall at its upper end |
| Answer» D. perpendicular to the wall at its upper end | |
| 167. |
Two equal and opposite parallel forces whose lines of action are different, can be replaced by a single force parallel to the given forces. |
| A. | Correct |
| B. | Incorrect |
| Answer» C. | |
| 168. |
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. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 169. |
The time of flight of a projectile on downward inclined plane depends upon |
| A. | angle of projection |
| B. | angle of inclination of the plane |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» D. none of these | |
| 170. |
The force induced in the string due to the load as shown in the below figure is |
| A. | sin θ |
| B. | cos θ |
| C. | tan θ |
| D. | cot θ |
| Answer» E. | |
| 171. |
The force applied on a body of mass 100 kg to produce an acceleration of 5 m/s, is |
| A. | 20N |
| B. | 100N |
| C. | 500N |
| D. | none of these |
| Answer» D. none of these | |
| 172. |
The motion of the body from one extremity to the other is known as a beat. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 173. |
The centre of gravity of a rectangle lies at a point where its two diagonals meet each other. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 174. |
A framed structure is perfect, if the number of members are __________ (2 - 3), where is the number of joints. |
| A. | equal to |
| B. | less than |
| C. | greater than |
| D. | either (b) or (c) |
| Answer» B. less than | |
| 175. |
Moment of inertia of a triangular section of base () and height () about an axis passing through its C.G. and parallel to the base, is |
| A. | /4 |
| B. | /8 |
| C. | /12 |
| D. | /36 |
| Answer» E. | |
| 176. |
If a number of forces are acting at a point, theirresultant will be inclined at an angle θ with the horizontal, such that |
| A. | tan θ = ∑H/∑V |
| B. | tan θ = ∑V/∑H |
| C. | tan θ = ∑Vx∑H |
| Answer» C. tan θ = ∑Vx∑H | |
| 177. |
The centre of gravity of an equilateral triangle with each side , is __________ from any of the three sides. |
| A. | /2 |
| B. | 2 |
| C. | /2 |
| D. | 3 |
| Answer» D. 3 | |
| 178. |
If two bodies having masses and (>) have equal kinetic energies, the momentum of body having mass is __________ the momentum of body having mass . |
| A. | equal to |
| B. | less than |
| C. | greater than |
| Answer» D. | |
| 179. |
The velocity ratio in case of an inclined plane inclined at angle θ to the horizontal and weight being pulled up the inclined plane by vertical effort is |
| A. | sin θ |
| B. | cos θ |
| C. | tan θ |
| D. | cosec θ |
| Answer» B. cos θ | |
| 180. |
Two balls of equal mass and of perfectly elastic material are lying on the floor. One of the ball with velocity is made to struck the second ball. Both the balls after impact will move with a velocity |
| A. | /2 |
| B. | /4 |
| C. | /8 |
| Answer» C. /8 | |
| 181. |
The weight of a body is due to |
| A. | Gravitational pull exerted by the earth |
| B. | Forces experienced by body in atmosphere |
| C. | Force of attraction experienced by particles |
| D. | Gravitational force of attraction towards the centre of the earth |
| Answer» E. | |
| 182. |
The unit of force in S.I. units is |
| A. | kilogram |
| B. | Newton |
| C. | Watt |
| D. | Dyne |
| Answer» C. Watt | |
| 183. |
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. | Sum of resolved parts in the vertical direction is zero (i.e. V = 0) |
| D. | None of these |
| Answer» D. None of these | |
| 184. |
Non-coplanar 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 | |
| 185. |
Which of the following is not the unit of power? |
| A. | kW (kilowatt) |
| B. | hp (horse power) |
| C. | kcal/sec |
| D. | kcal/kg sec |
| Answer» E. | |
| 186. |
D' Alembert's principle is used for |
| A. | Reducing the problem of kinetics to equivalent statics problem |
| B. | Determining stresses in the truss |
| C. | Stability of floating bodies |
| D. | Designing safe structures |
| Answer» B. Determining stresses in the truss | |
| 187. |
For any system of coplanar 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. | |
| 188. |
From a circular plate of diameter 6 cm is cut out a circle whose diameter is a radius of the plate. Find the e.g. of the remainder from the centre of circular plate |
| A. | 0.5 cm |
| B. | 1.0 cm |
| C. | 1.5 cm |
| D. | 2.5 cm |
| Answer» B. 1.0 cm | |
| 189. |
When the lift is moving upwards with some acceleration, the pressure exerted by a man is __________ to its acceleration. |
| A. | Directly proportional |
| B. | Inversely proportional |
| C. | Cube root |
| D. | None of these |
| Answer» B. Inversely proportional | |
| 190. |
A body moves, from rest with a constant acceleration of 5 m per sec. The distance covered in 5 sec is most nearly |
| A. | 38 m |
| B. | 62.5 m |
| C. | 96 m |
| D. | 124 m |
| Answer» C. 96 m | |
| 191. |
A cable with a uniformly distributed load per horizontal meter run will take the following shape |
| A. | Straight line |
| B. | Parabola |
| C. | Hyperbola |
| D. | Elliptical |
| Answer» C. Hyperbola | |
| 192. |
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» C. P / Q | |
| 193. |
The coefficient of friction depends upon |
| A. | Nature of surfaces |
| B. | Area of contact |
| C. | Shape of the surfaces |
| D. | All of the above |
| Answer» B. Area of contact | |
| 194. |
Forces are called coplanar when all of them acting on body lie in |
| A. | One point |
| B. | One plane |
| C. | Different planes |
| D. | Perpendicular planes |
| Answer» C. Different planes | |
| 195. |
Centre of gravity of a solid cone lies on the axis at the height |
| A. | One fourth of the total height above base |
| B. | One third of the total height above base |
| C. | One-half of the total height above base |
| D. | Three eighth of the total height above the base |
| Answer» B. One third of the total height above base | |
| 196. |
The periodic time (T) is given by (where, = Angular velocity of particle in rad/s.) |
| A. | /2 |
| B. | 2 / |
| C. | 2 |
| D. | / |
| Answer» C. 2 | |
| 197. |
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. | ml /4 |
| B. | ml / 6 |
| C. | ml /8 |
| D. | ml /12 |
| Answer» E. | |
| 198. |
The C.G. of a plane lamina will not be at its geometrical centre in the case of a |
| A. | Right angled triangle |
| B. | Equilateral triangle |
| C. | Square |
| D. | Circle |
| Answer» B. Equilateral triangle | |
| 199. |
The moment of inertia of a solid cone of mass m and base radius r about its vertical axis is |
| A. | 3mr /5 |
| B. | 3mr /10 |
| C. | 2mr /5 |
| D. | 4mr /5 |
| Answer» C. 2mr /5 | |
| 200. |
Pick up wrong statement about friction force for dry surfaces. Friction force is |
| A. | Proportional to normal load between the surfaces |
| B. | Dependent on the materials of contact surface |
| C. | Proportional to velocity of sliding |
| D. | Independent of the area of contact surfaces |
| Answer» D. Independent of the area of contact surfaces | |