McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 101. |
Which of the following statement is incorrect? |
| A. | A body can have energy without having momentum |
| B. | A body cannot have kinetic energy without having momentum |
| C. | A body in motion will always have kinetic energy more than the potential energy |
| D. | None of the above |
| E. | 107 dynes |
| Answer» C. A body in motion will always have kinetic energy more than the potential energy | |
| 102. |
The value of acceleration due to gravity is 980 cm/sec2. Its value in meter per (hour)2 will be |
| A. | 1.27 x 108 |
| B. | 127 |
| C. | 1270 |
| D. | 1.27 x 107 |
| E. | 1270000 |
| Answer» A. 1.27 x 108 | |
| 103. |
The torque acting on a system is zero. Which of the following will be conserved? |
| A. | Angular velocity |
| B. | Linear momentum |
| C. | 107 dynes |
| D. | Angular momentum |
| E. | Moment of inertia |
| Answer» D. Angular momentum | |
| 104. |
Our weight will be zero under all of the following conditions EXCEPT |
| A. | 107 dynes |
| B. | We are at the centre of the earth |
| C. | When we are ascending in a lift with acceleration of 4.9 m/s2 |
| D. | We are orbiting in a satellite |
| E. | When we are freely faling |
| Answer» C. When we are ascending in a lift with acceleration of 4.9 m/s2 | |
| 105. |
A clock with a second pendulum is gaining 5 minutes a day. To correct it |
| A. | The eccentricity of bob with pendulum should be decreased |
| B. | The length of the pendulum should be decreased |
| C. | The length of pendulum should not be changed |
| D. | The length of the pendulum should be increased |
| E. | The eccentricity of bon with pendulum should be increased |
| Answer» D. The length of the pendulum should be increased | |
| 106. |
Which of the following is not a projectile? |
| A. | Bullet coming out of a revolver |
| B. | Arrow released from a bow |
| C. | Lifting of a balloon |
| D. | Throwing a cricket ball from one player to another |
| E. | None of the above |
| Answer» D. Throwing a cricket ball from one player to another | |
| 107. |
The piston of a steam engine moves in S.H.M. The crank rotates at 180 r.p.m. and the stroke length is 2 metres. The linear velocity of the piston when it is at a distance of 1 metre from the centre is |
| A. | 8.88 m/sec |
| B. | 16.32 m/sec |
| C. | 5.88 m/sec |
| D. | 8.16 m/sec |
| E. | Zero |
| Answer» E. Zero | |
| 108. |
A cage weighing 200 kg is lowered down a mine shaft with uniform acceleration. In the first 5 sec the cage reaches a depth of 20 m. The tension in the cord lowering the cage would be |
| A. | 836 kg |
| B. | 167.2 kg |
| C. | 100 kg |
| D. | 41.8 kg |
| E. | 200 kg |
| Answer» B. 167.2 kg | |
| 109. |
Static friction is always |
| A. | greater than the dynamic driction |
| B. | either greater or more than the dynamic friction |
| C. | less than the dynamic friction |
| D. | 107 dynes |
| E. | equal to the dynamic friction |
| Answer» A. greater than the dynamic driction | |
| 110. |
Which of the following bearing will have least coefficient of friction |
| A. | Single ball bearing |
| B. | Cylinderical roller bearing |
| C. | Self aligury bearing |
| D. | Thrust ball bearing |
| E. | Tapered bearing |
| Answer» E. Tapered bearing | |
| 111. |
The dimensions of power are |
| A. | ML2T3 |
| B. | ML2T2 |
| C. | MLT3 |
| D. | ML2T-3 |
| E. | 107 dynes |
| Answer» D. ML2T-3 | |
| 112. |
A body is executing simple harmonic motion of amplitude 1 cm. Its velocitywhile passing through the central point is 10 mm/sec. Its frequency will be |
| A. | 2.99 rps |
| B. | 2.22 rps |
| C. | 1 rps |
| D. | 1.59 rps |
| E. | 1.77 rps |
| Answer» C. 1 rps | |
| 113. |
Which of the following is dimensionless? |
| A. | Specific speed |
| B. | Specific volume |
| C. | Specific gravity |
| D. | Specific weight |
| E. | None of the above |
| Answer» C. Specific gravity | |
| 114. |
If two bodies one light and one heavy have equal kinetic energies, which one has a greater momentum? |
| A. | Momentum depends on velocities |
| B. | Heavy body |
| C. | Both have equal momentum |
| D. | Nothing can be concluded on the basis of information provided |
| E. | Light body |
| Answer» B. Heavy body | |
| 115. |
A car travelling at a speed of 60 km/hour is braked and comes to rest 6 seconds after the brakes are applied. The minimum coefficient of driction between the wheels and the road would be |
| A. | 0.107 |
| B. | 0.3 |
| C. | 0.283 |
| D. | 0.417 |
| E. | 0.5 |
| Answer» C. 0.283 | |
| 116. |
A man weighing 60 kg jumps on a vehicle of weight 240 kg moving with a velocity of 36 km/hours. The velocity of the vehicle after the man has jumped would be |
| A. | Less than 3.6 km/hour |
| B. | 3.6 km/hour |
| C. | More than 3.6 km/hour |
| D. | 4.5 km/hour |
| E. | None of the above |
| Answer» A. Less than 3.6 km/hour | |
| 117. |
How many coins 0.75 cm in diameter and 1/8 cm thick must be malted down to form a rectangular solid whose edges are 5 cm. 4 cm and 3 cm? |
| A. | 584 |
| B. | 1087 |
| C. | 0.00001745 sec-1 |
| D. | 1234 |
| E. | 2174 |
| Answer» B. 1087 | |
| 118. |
The gravitational field intensity is maximum at the |
| A. | 107 dynes |
| B. | at a height above the surface |
| C. | pole |
| D. | equator |
| E. | centre of the earth |
| Answer» E. centre of the earth | |
| 119. |
A ball of mass 1 kg moving with a velocity of 2 m/sec collides directly with a stationary ball of mass 2 kg. If the first ball comes to rest after the impact the velocity of second ball after impact will be |
| A. | 1.5 m/sec |
| B. | 0.5 m/sec |
| C. | Zero |
| D. | 2 m/sec |
| E. | 1.0 m/sec |
| Answer» E. 1.0 m/sec | |
| 120. |
A particle moves along a rough plane inclined at 30? to the horizontal. The co-efficient of friction between the particle and the plane is 0.1. Its initial velocity is 15 m/sec. The ratio of the velocity of the particle when it move down the plane to that when it move up the plane would be in the regions |
| A. | 8 ? 10 |
| B. | 5 ? 7 |
| C. | 2 ? 3 |
| D. | 4 ? 6 |
| E. | 10 ? 13 |
| Answer» B. 5 ? 7 | |
| 121. |
In case of cantilever, irrespective of the type of loading the maximum bendry moment and maximum shear force occur at |
| A. | 107 dynes |
| B. | Free end |
| C. | 2/3 of the length, from the free end |
| D. | Centre of the beam |
| E. | Fixed end |
| Answer» E. Fixed end | |
| 122. |
A beam fixed at both ends with a central load W in the middle will have zero bending moment at |
| A. | one place |
| B. | two places |
| C. | no where |
| D. | three places |
| E. | 107 dynes |
| Answer» B. two places | |
| 123. |
If the positive and negative shear force diagram areas are not equal, it can be concluded that |
| A. | shear force diagram has been wrongly drawn |
| B. | there is at least one couple acting on the beam |
| C. | 107 dynes |
| D. | there are at least two maxima for bending moment |
| E. | bending moment does not change sign |
| Answer» B. there is at least one couple acting on the beam | |
| 124. |
One joule is equal to |
| A. | 105 ergs |
| B. | 108 ergs |
| C. | 104 ergs |
| D. | 107 ergs |
| E. | 106 ergs |
| Answer» D. 107 ergs | |
| 125. |
A uniform cylinder of weight W is rolling while slipping on a rough horizontal surface under the influence of a horizontal force. The force of friction between the cylinder and the surface is |
| A. | Indeterminate |
| B. | Proportional to the coefficient of dynamic friction |
| C. | Determinate but depends on the acceleration of the cylinder |
| D. | 107 dynes |
| E. | Proportional to the coefficient of static friction |
| Answer» C. Determinate but depends on the acceleration of the cylinder | |
| 126. |
The forces which meet at one point but their lines of action do not lie in one plane, are called |
| B. | Coplanar noncurrent forces |
| C. | Non-coplanar nonconcurrent forces |
| D. | Intersecting forces |
| E. | Coplanar concurrent forces |
| Answer» C. Non-coplanar nonconcurrent forces | |
| 127. |
The common acceleration will be |
| A. | 1.5 m/s2 |
| B. | 1.0 m/s2 |
| C. | 107 dynes |
| D. | 6 m/s2 |
| E. | 3 m/s2 |
| Answer» B. 1.0 m/s2 | |
| 128. |
The locus of instantaneous centre of a moving rigid body |
| A. | Epicycloid |
| B. | Straight line |
| C. | Involute |
| D. | Cycloid |
| E. | Centrode |
| Answer» E. Centrode | |
| 129. |
When all the forces acting on a body lie in one plane and their lines of action meet at one point, the forces |
| A. | constitute a moment |
| B. | constitute a couple |
| C. | are known as coplaner-concurrent forces. |
| D. | are known as non-coplaner forces |
| E. | 107 dynes |
| Answer» C. are known as coplaner-concurrent forces. | |
| 130. |
A force F = 2i + 3j - k is passing through the origin. Its moment about point (1, 1, 0) is |
| A. | Zero |
| B. | 2i + 3j |
| C. | i - j - k |
| D. | i + j |
| E. | i + j + k |
| Answer» C. i - j - k | |
| 131. |
Efficiency of a screw jack in maximum when its 31 helix angle, ? is |
| A. | 45 + ?/2 |
| B. | 107 dynes |
| C. | ? |
| D. | 45 - ?/2 |
| E. | 45? |
| Answer» D. 45 - ?/2 | |
| 132. |
When two concurrent and coplaner forces P and Q act at an angle of 180?, their resultant will be a |
| A. | moment equal to PQ |
| B. | couple |
| C. | (P-Q) |
| D. | 107 dynes |
| E. | zero |
| Answer» C. (P-Q) | |
| 133. |
A man lifts a stone weighting 300 g from the ground to a height of 2m and throws it horizontally with a velocity of 6 m/sec. The work done by the man is |
| A. | 7.686 J |
| B. | 11.286 J |
| C. | 5.886 J |
| D. | 8.343 J |
| E. | Tapered bearing |
| Answer» B. 11.286 J | |
| 134. |
A body of weight 100 kg is placed on a horizontal plane. A horizontal force of 30 kg is applied and the block is just on the point of motion. The angle of friction is |
| A. | About 16? |
| B. | 30? |
| C. | 45? |
| D. | 60? |
| E. | None of the above |
| Answer» A. About 16? | |
| 135. |
If the above tape weights 0.001 kg/ft, sag is |
| A. | 2.73 ft |
| B. | 3.13 ft |
| C. | 2.90 ft |
| D. | 3.03 ft |
| E. | 107 dynes |
| Answer» C. 2.90 ft | |
| 136. |
A body whose true weight is 14 kg appears to weigh 15 kg when weighed with the help of a spring balance in a moving lift. The acceleration of the lift at the time was |
| A. | 1 m/sec2 |
| B. | 0.7 m/sec2 |
| C. | 0.5 m/sec2 |
| D. | 1.4 m/sec2 |
| E. | 0.35 m/sec2 |
| Answer» B. 0.7 m/sec2 | |
| 137. |
Which of the following pair will have identical dimensions? |
| A. | Pressure and surface tension |
| B. | Work and kinetic energy |
| C. | Momentum and force |
| D. | Moment of inertia and angular momentum |
| E. | None of the above |
| Answer» C. Momentum and force | |
| 138. |
A particle is moving in Simple Harmonic Motion in a simple pendulum with some period of oscillation. Now in order to double the period of oscillation |
| A. | The length of pendulum should be quadrupled |
| B. | The length of pendulum should be doubled |
| C. | The mass of the bob should be halved |
| D. | The length of pendulum should be reduced to one fourth |
| E. | The mass of the bob should be doubled |
| Answer» A. The length of pendulum should be quadrupled | |
| 139. |
Under which circumstances will have zero velocity and be still accelerating? |
| A. | The bob of a simple pendulum when at its mean position |
| B. | 107 dynes |
| C. | A steamer while taking a turn |
| D. | A ball at its highest point of its rise when thrown up |
| E. | Tyres of a stationary automobile |
| Answer» D. A ball at its highest point of its rise when thrown up | |
| 140. |
Newton, dyne and poundal are known as |
| A. | absolute units |
| B. | fundamental units |
| C. | gravitational units |
| D. | absolute units |
| E. | 107 dynes |
| Answer» D. absolute units | |
| 141. |
ML2T-2 could be the dimension of |
| A. | 107 dynes |
| B. | moment of force |
| C. | viscosity |
| D. | mass moment of inertia |
| E. | momentum |
| Answer» B. moment of force | |
| 142. |
The moving parts of a machine which weigh 1 tonne perform vertical simple harmonic motion with an amplitude of 2.5 cm and a period of 0.5 sec. The base of the machine weighs 3 tonnes and rests on the ground. Maximum reactions on the ground would be |
| A. | 3.6 tonnes |
| B. | 2.4 tonnes |
| C. | 4.0 tonnes |
| D. | 4.8 tonnes |
| E. | 4.4 tonnes |
| Answer» E. 4.4 tonnes | |
| 143. |
A ball is allowed to fall freely from a height of 3 metres on to a fixed plate. If the successive rebound heights are h1, h2, h3 |
| A. | 5 metres |
| B. | 4.25 metre |
| C. | 0.5 metre |
| D. | 1 metre |
| E. | Zero |
| Answer» A. 5 metres | |
| 144. |
In the above problem, acceleration of crooshead at 30? phase equals |
| A. | 107 dynes |
| B. | 640 m/s2 |
| C. | 780 m/s2 |
| D. | 520 m/s2 |
| E. | 870 m/s2 |
| Answer» E. 870 m/s2 | |
| 145. |
If a particle charges its angular velocity from 30 to 35 rpm in 20 seconds then it has angular acceleration of |
| A. | 107 dynes |
| B. | 30 rev/min2 |
| C. | 10 rev/min2 |
| D. | 20 rev/min2 |
| E. | 15 rev/min2 |
| Answer» E. 15 rev/min2 | |
| 146. |
Power required for a train weighing 200 Mg to move at a uniform speed of 60 Kmph up an incline of 1 in 200 is (Resistance due to friction is negligible) |
| A. | 16.67 KW |
| B. | 163.5 KW |
| C. | 1000 KW |
| D. | 9810 KW |
| E. | Tapered bearing |
| Answer» B. 163.5 KW | |
| 147. |
If air resistance is neglected, at the mid-point of its swing, the acceleration of the bob of a simple pendulum along its path is always |
| A. | Increasing |
| B. | Zero |
| C. | A cycloid |
| D. | Decreasing |
| E. | A minimum but not equal to zero |
| Answer» D. Decreasing | |
| 148. |
The force which produces an acceleration of 1 m/sec2 in a mass of 1 kg is called |
| A. | 100 ergs |
| B. | one Newton |
| C. | one watt |
| D. | One erg |
| E. | one joule |
| Answer» B. one Newton | |
| 149. |
The maximum efficiency of a scres jack having square threads and friction angle of 30 degree will be |
| A. | 20% |
| B. | 11% |
| C. | 5% |
| D. | 33% |
| E. | 9% |
| Answer» D. 33% | |
| 150. |
Water rises in a capillary tube to a height h. It will rise to a height more than h. |
| A. | in a lift moving up with an acceleration |
| B. | in all the above cases |
| C. | 107 dynes |
| D. | at the poles |
| E. | on the surface of moon |
| Answer» E. on the surface of moon | |
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