McqMate
| 201. |
The angular velocity of earth is |
| A. | 0.00727 sec-1 |
| B. | 0.000727 sec-1 |
| C. | 0.0000727 sec-1 |
| D. | 0.00000727 sec-1 |
| E. | None of the above |
| Answer» C. 0.0000727 sec-1 | |
| 202. |
The torque of 50 Nm is applied on the wheel operating a valve. If the wheel is rotated through two revolutions, work done in Newton-metres is given by |
| A. | 628 |
| B. | 107 dynes |
| C. | 314 |
| D. | 25 |
| E. | 100 |
| Answer» A. 628 | |
| 203. |
In a single threaded worm and worm wheel the number of teeth on the worm wheel is 80. The diameter of the effort wheel is 12 cm and that of load drum is 8 cm. The velocity ratio will be |
| A. | 60 |
| B. | 45 |
| C. | 120 |
| D. | 107 dynes |
| E. | 90 |
| Answer» C. 120 | |
| 204. |
A horizontal load of 120 kg/mt is to be carried by a cable suspended between supports at same level and 60 mts apart. If the maximum permissible tension is 36,000 kg the required length of cable is |
| A. | 63.3 mets |
| B. | 62.5 mts |
| C. | 60.8 mts |
| D. | 107 dynes |
| E. | 60.1 mts |
| Answer» E. 60.1 mts | |
| 205. |
For a self locking lifting machine, the efficiency must be |
| A. | 50 percent |
| B. | 100 percent |
| C. | more than 50 percent |
| D. | 107 dynes |
| E. | less than 50 percent |
| Answer» E. less than 50 percent | |
| 206. |
The periodic time of a body moving in Simple Harmonic Motion is |
| A. | Directly proportional to its angular velocity |
| B. | Directly proportional to the weight of the body |
| C. | Inversely proportional to the square of angular velocity |
| D. | Directly proportional to the momentum of swinging body |
| E. | Inversely proportional to the angular velocity |
| Answer» E. Inversely proportional to the angular velocity | |
| 207. |
A grinding wheel rotates at 3000 rpm. When power supply is cut-off the wheel stops in 10 seconds. The number of revolutions made by the wheel before coming to rest would be |
| A. | 1500 |
| B. | 3000 |
| C. | 1000 |
| D. | 250 |
| E. | 500 |
| Answer» D. 250 | |
| 208. |
A satellite orbits around the earth due to |
| A. | Celestial force |
| B. | Gravitational force |
| C. | Centrifugal force |
| D. | Centripetal force |
| E. | All of the above |
| Answer» C. Centrifugal force | |
| 209. |
A 2 m long shaft rotates about one end at 20 rad/s. It begins to accelerate with ? = 10 rads/s2. After how long, in seconds, will the velocity of the free end reach 100 m/s? |
| A. | 3 |
| B. | 107 dynes |
| C. | 5 |
| D. | 6 |
| E. | 7 |
| Answer» A. 3 | |
| 210. |
The resultant of a force acting on a body will be zero, if the body |
| A. | Rotates with uniform acceleration |
| B. | Moves along a curved path |
| C. | Rotates |
| D. | Does not rotate |
| E. | Rotates with uniform deceleration |
| Answer» D. Does not rotate | |
| 211. |
What will be the duration of day and night if the earth shrinks to half the present radius? |
| A. | 6 hours |
| B. | 12 hours |
| C. | 107 dynes |
| D. | 3 hours |
| E. | 24 hours |
| Answer» A. 6 hours | |
| 212. |
If you want to stop the car in the shortest distance on an icy road, you should |
| A. | 107 dynes |
| B. | not apply the brakes |
| C. | pump' the brakes |
| D. | push hard the brakes to lock the wheels |
| E. | push just hard enough to prevent slipping |
| Answer» E. push just hard enough to prevent slipping | |
| 213. |
A man pulls a cart with 100 N force from rest with an acceleration of 10 m/sec2 for 10 seconds. The work done by him is |
| A. | 500 KJ |
| B. | 50.96 KJ |
| C. | 101.92 KJ |
| D. | None of the above |
| E. | Tapered bearing |
| Answer» A. 500 KJ | |
| 214. |
The shape of a suspended cable under its own weight is |
| A. | Catenary |
| B. | Elliptical |
| C. | Cycloidal |
| D. | Semi-circle |
| E. | Parabolic |
| Answer» A. Catenary | |
| 215. |
TIES : STRUTS : |
| A. | purlins : piers |
| B. | angle : tee |
| C. | rolle support : hinge |
| D. | compression : tension |
| E. | 107 dynes |
| Answer» D. compression : tension | |
| 216. |
The angle which an inclined surface makes with the horizontal when a body placed on it is on the point moving down is known as |
| A. | Angle of friction |
| B. | Angle of limiting friction |
| C. | Angle of inclination |
| D. | Angle of repose |
| E. | None of the above |
| Answer» D. Angle of repose | |
| 217. |
The radius of gyration of a solid sphere of radius r is equal to |
| A. | 0.8 r2 |
| B. | 0.2 r2 |
| C. | 0.3 r2 |
| D. | 0.4 r2 |
| E. | 0.5 r2 |
| Answer» D. 0.4 r2 | |
| 218. |
Ice is slippery when a man walks on it because |
| A. | Increase of pressure causes it to melt |
| B. | Ice is brittle |
| C. | There is no friction |
| D. | It is very chill |
| E. | Its surface is smooth |
| Answer» A. Increase of pressure causes it to melt | |
| 219. |
The mass, in kg, of the earth if its radius is 6400 km, will be |
| A. | 6 x 1024 |
| B. | 6 x 1025 |
| C. | 107 dynes |
| D. | 6 x 1023 |
| E. | 6 x 1022 |
| Answer» A. 6 x 1024 | |
| 220. |
In a single threaded worm and worm wheel the number of teeth on the worm wheel is 60. The diameter of the effort wheel is 12 cm and that of load drum is 8 cm. The velocity ratio will be |
| A. | 90 |
| B. | 120 |
| C. | 60 |
| D. | 45 |
| E. | 107 dynes |
| Answer» A. 90 | |
| 221. |
A particle of mass M moves towards right with a velocity 2 V along the x-axis and another of mass 2 M with a velocity V towards left (- x axis). After the collision (they stick together on colliging) they will |
| A. | come to rest |
| B. | 107 dynes |
| C. | move towards right |
| D. | may move in any direction |
| E. | move towards left |
| Answer» C. move towards right | |
| 222. |
A cannon of weight 10 tonnes fires a shell of 50 kg with a muzzle velocity of 900 m/sec at an angle of 30?. The time taken for the shell to emerge from the barrel is 0.004 sec. The velocity of the cannon would be |
| A. | 3.9 m/sec |
| B. | 7.8 m/sec |
| C. | 8.95 m/sec |
| D. | 1.95 m/sec |
| E. | 5.85 m/sec |
| Answer» A. 3.9 m/sec | |
| 223. |
A car is travelling at 90 km/hour on a rough road where the coefficient of friction between the road and the tyre is 0.5. The distance the car will skid before stopping when the brakes are jammed suddenly would be |
| A. | 127.4 m |
| B. | 95.55 m |
| C. | 63.7 m |
| D. | 31.85 m |
| E. | 90 m |
| Answer» C. 63.7 m | |
| 224. |
One newton is equal to |
| A. | 106 dynes |
| B. | 105 dynes |
| C. | 104 dynes |
| D. | 103 dynes |
| E. | 107 dynes |
| Answer» B. 105 dynes | |
| 225. |
In the third system of pulleys, if there are n number of pulleys then the velocity ratio of the system will be |
| A. | 2n - 2 |
| B. | n |
| C. | 107 dynes |
| D. | 2n-1 |
| E. | 2n |
| Answer» D. 2n-1 | |
| 226. |
For perfectly elastic bodies the value of the coefficient of restitution is |
| A. | 0.707 |
| B. | 0.5 |
| C. | 1 |
| D. | 0.25 |
| E. | Zero |
| Answer» A. 0.707 | |
| 227. |
A satellite launch station should be |
| A. | 107 dynes |
| B. | near the equatorial region |
| C. | all the locations are equally good |
| D. | one the polar axis |
| E. | near the polar region |
| Answer» B. near the equatorial region | |
| 228. |
The direction of projection for the range of a projectile to be maximum on an inclined plane having angle of inclination 30? to the horizontal, whould be |
| A. | 45? with horizontal |
| B. | 30? with vertical |
| C. | 30? with horizontal |
| D. | 60? with inclined plane |
| E. | 45? with inclined plane |
| Answer» B. 30? with vertical | |
| 229. |
If for power transmission a gear train consisting of 8 gears is used, then |
| A. | the motion of driver and follower will be in the same direction |
| B. | the motion of driver and follower will be in the opposite directions |
| C. | either of (A) or (B) above |
| D. | None of the above |
| E. | 107 dynes |
| Answer» B. the motion of driver and follower will be in the opposite directions | |
| 230. |
A train travels between two stations 15 km, apart in 18 minutes. If the train accelerates for a part of journey uniformly followed by uniform relardation, the maximum speed attained by the train, during, the journey, will be |
| A. | 60 km/hr |
| B. | 80 km/hr |
| C. | 125 km/hr |
| D. | 100 km/hr |
| E. | 107 dynes |
| Answer» D. 100 km/hr | |
| 231. |
The tension T1 will be |
| A. | 5 N |
| B. | 20 N |
| C. | 60 N |
| D. | 10 N |
| E. | 107 dynes |
| Answer» D. 10 N | |
| 232. |
A imaginary planet has half the mass and half the radius of the earth. The acceleration of gravity at its surface would be |
| A. | 9.8 m/s2 |
| B. | 107 dynes |
| C. | 4.9 m/s2 |
| D. | 19.6 m/s2 |
| E. | 2.45 m/s2 |
| Answer» D. 19.6 m/s2 | |
| 233. |
The principle of conservation of energy cannot be applied in case of |
| A. | Flow of heat through a metal |
| B. | Ideal flow of water in a pipe |
| C. | Simple pendulum |
| D. | Sliding of a particle along inclined plane with friction |
| E. | A particle moving in gravitational field |
| Answer» E. A particle moving in gravitational field | |
| 234. |
A truss element |
| A. | 107 dynes |
| B. | resists lateral forces |
| C. | is a two-force body |
| D. | is a three force body |
| E. | resist forces in compression only |
| Answer» C. is a two-force body | |
| 235. |
Impulse can be obtained from |
| A. | force-time diagram |
| B. | velocity-time diagram |
| C. | 107 dynes |
| D. | force displacement diagram |
| E. | velocity-displacement diagram |
| Answer» A. force-time diagram | |
| 236. |
A mass of 5 kg moves on a smooth horizontal plane with a speed of 8 m/s attached to a fixed point on the plane by a string of length 4m. Tension in the string is |
| A. | 785 |
| B. | 80N |
| C. | 392.4N |
| D. | None of the above |
| E. | Tapered bearing |
| Answer» B. 80N | |
| 237. |
The area under stress-strain curve represents |
| A. | Hardness of material |
| B. | Breaking strength of the material |
| C. | Energy required to cause failure |
| D. | Toughness of material |
| E. | Malleabbility of material |
| Answer» C. Energy required to cause failure | |
| 238. |
A flywheel 200 cm in diameter is rotating at 100 rpm. A point on the rim of the flywheel will not have |
| A. | angular velocity |
| B. | centripental acceleration |
| C. | tangential acceleration |
| D. | all of the above |
| E. | 107 dynes |
| Answer» C. tangential acceleration | |
| 239. |
A block of weight 20 kg slides with an initial velocity of 2 m sec down an inclined plane on to a spring of stiffness 10 kg/cm. If the co--efficient of friction is 0.2, angle ? = 30 the ratio of maximum compession of spring, neglecting friction to that while considering friction would be |
| A. | More than one |
| B. | One |
| C. | Less than one |
| D. | Depends on the stiffness of spring |
| E. | None of the above |
| Answer» A. More than one | |
| 240. |
A jet engine works on the principle of |
| A. | Conservation of energy |
| B. | Conservation of mass and momentum |
| C. | Conservation of linear mementum |
| D. | Conservation of energy and momentum |
| E. | Conservation of mass |
| Answer» C. Conservation of linear mementum | |
| 241. |
The angular velocity of seconds hand of a watch is |
| A. | 0.01745 sec-1 |
| B. | 0.00001745 sec-1 |
| C. | 0.0001745 sec-1 |
| D. | 0.001745 sec-1 |
| E. | 0.1047 sec-1 |
| Answer» D. 0.001745 sec-1 | |
| 242. |
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. | Proportional to the coefficient of static friction |
| B. | Proportional to the coefficient of dynamic friction |
| C. | Indeterminate |
| D. | Determinate but depends on the acceleration of the cylinder |
| E. | None of the above |
| Answer» C. Indeterminate | |
| 243. |
The statement ---- if three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two ---- is known as |
| A. | Law of polygon of forces |
| B. | D'Alembert's principle |
| C. | Newtons law of forces |
| D. | Lami's theorem |
| E. | Law of triangle of forces |
| Answer» D. Lami's theorem | |
| 244. |
The dimensions of modulus of elasticity are |
| A. | MLT-2 |
| B. | 107 dynes |
| C. | MLT-1 |
| D. | ML-2T-1 |
| E. | ML-1T-2 |
| Answer» E. ML-1T-2 | |
| 245. |
A sphere of radius r is cut from larger sphere of radius R. The distance between their centre is a. The centroid of the remaining valoume lies on the line of centres and the sistanc from the centre of the larger sphere is |
| A. | ar2 / (R2 - r2) |
| B. | 107 dynes |
| C. | aR/(R2-r2) |
| D. | aR/(R - r) |
| E. | ar3 / (R3 - r3) |
| Answer» E. ar3 / (R3 - r3) | |
| 246. |
For a perfect frame having 13 members the number of joints must be |
| A. | 8 |
| B. | 6 |
| C. | 7 |
| D. | 107 dynes |
| E. | 9 |
| Answer» A. 8 | |
| 247. |
When a body moves round a fixed axis it will have |
| A. | A motion of rotation and translation |
| B. | A circular motion |
| C. | A rotary motion |
| D. | A translatory motion |
| E. | A swinging motion |
| Answer» B. A circular motion | |
| 248. |
A ball is dropped from a height of 2.25 m on a smooth floor and it rises to a height of 1 m after the first bounce. The coefficient of restitutions between the ball and the floor is |
| A. | 107 dynes |
| B. | 0.33 |
| C. | 0.44 |
| D. | 0.57 |
| E. | 0.67 |
| Answer» E. 0.67 | |
| 249. |
The work done in sliding a block of weight of 50 kg up a plane inclined at an angle of 30? to the horizontal so that the block is lifted through 1 m |
| A. | More than 50 kgm |
| B. | 50 kgm |
| C. | Less than 5 kgm |
| D. | 15 kgm only |
| E. | None of the above |
| Answer» A. More than 50 kgm | |
| 250. |
For perfectly elastic bodies, the value of the coefficient of restitution is |
| A. | 1 |
| B. | 0.372 |
| C. | 0.5 |
| D. | Zero |
| E. | Any value between 0 and 1 |
| Answer» A. 1 | |
| 251. |
Secondary stresses may be set up in frame due to any of the following reasons EXCEPT |
| A. | members not being straight |
| B. | self-weight of the members |
| C. | eccentricity of connections |
| D. | rigidity of the members |
| E. | 107 dynes |
| Answer» D. rigidity of the members | |
| 252. |
Moment of Inertia of triangular section about an axis passing through its base is given by |
| A. | bh3/12 |
| B. | bh3/32 |
| C. | bh3/36 |
| D. | None of the above |
| E. | Tapered bearing |
| Answer» A. bh3/12 | |
| 253. |
Which of the following could be the unit of rotational inertia of a body in CGS system? |
| A. | cm4 |
| B. | gm-cm2 |
| C. | 107 dynes |
| D. | kg-cm2 |
| E. | gm-cm4 |
| Answer» B. gm-cm2 | |
| 254. |
The angular acceleration of a flywheel decreases uniformly from 8 rad/sec2 to 2 rad sec2 in 6 sec at which time its angular velocity is 42 rad/sec. The initial angular velocity was |
| A. | 12 rad/sec |
| B. | 24 rad/sec |
| C. | 30 rad/sec |
| D. | 3 rad/sec |
| E. | 6 rad/sec |
| Answer» A. 12 rad/sec | |
| 255. |
During SHM which of the following is conserved? |
| A. | Kinetic energy |
| B. | Potential energy |
| C. | Total energy |
| D. | Momentum |
| E. | All of the above |
| Answer» D. Momentum | |
| 256. |
The standard angle between the sides of a V-belt is |
| A. | 30? |
| B. | 25? |
| C. | 40? |
| D. | 45? |
| E. | 55? |
| Answer» A. 30? | |
| 257. |
The main advantage of using worm gears is |
| A. | Low power loss |
| B. | High velocity ratio |
| C. | Ease of manufacture |
| D. | Minimum cost |
| E. | All of the above |
| Answer» C. Ease of manufacture | |
| 258. |
The angle of friction is |
| A. | The angle which frictional force makes with the normal |
| B. | The anle at which the force applied from external souce will cause movement |
| C. | The angle at which fictional force is inclined to external force |
| D. | The angle between the normal reaction and the resultant of normal reaction and the limiting friction |
| E. | None of the above |
| Answer» D. The angle between the normal reaction and the resultant of normal reaction and the limiting friction | |
| 259. |
In the speed of rotation of earth decreases, the weight of the body will |
| A. | Decrease |
| B. | Remain unaltered |
| C. | Depends on speed ratio |
| D. | Cannot be ascertained on the basis the information given |
| E. | Increase |
| Answer» C. Depends on speed ratio | |
| 260. |
Which of the following is not a lever of the first order? |
| A. | Pair of Smith's tongs |
| B. | Wheel barrow |
| C. | Ordinary balance |
| D. | Pair of scissors |
| E. | 107 dynes |
| Answer» B. Wheel barrow | |
| 261. |
A force of 100 Newtons acts for 0.5 seconds on a body of mass 20 kg which is initially at rest. The velocity attained by the body is |
| A. | 20 m/s |
| B. | 5 m/s |
| C. | 2.5 m/s |
| D. | 0.5 m/s |
| E. | 107 dynes |
| Answer» C. 2.5 m/s | |
| 262. |
The angle of projection when the range is equal to the distance through which the particle would have fallen in order to acquire a velocity equal to the velocity of projection will be |
| A. | 30? |
| B. | 45? |
| C. | 15? |
| D. | 90? |
| E. | 22 |
| Answer» C. 15? | |
| 263. |
The motion of a bicycle wheel is |
| A. | Curvilinear |
| B. | Translatory |
| C. | Linear |
| D. | Rotary as well as translatory |
| E. | Rotary |
| Answer» D. Rotary as well as translatory | |
| 264. |
A particle in simple Harmonic Motion while passing through mean position will have |
| A. | Maximum kinetic energy and minimum potential energy |
| B. | Average kinetic energy and average potential energy |
| C. | Minimum kinetic energy and maximum potential energy |
| D. | Maximum kinetic energy and maximum |
| E. | Minimum kinetic energy and minimum potential energy |
| Answer» A. Maximum kinetic energy and minimum potential energy | |
| 265. |
A bullet is fired from a fifle. If the rifle recoils freely, the kinetic energy of the rifle |
| A. | will be the same as the kinetic energy of the bullet |
| B. | will be less than the kinetic energy of the bullet |
| C. | 107 dynes |
| E. | will be more than the kinetic energy of the bullet |
| Answer» B. will be less than the kinetic energy of the bullet | |
| 266. |
The locus of a point on a thread unwound from a cylinder will be |
| A. | A circle |
| B. | A cycloid |
| C. | A straight line |
| D. | A spiral |
| E. | An involute |
| Answer» B. A cycloid | |
| 267. |
The moment of inertia of a thin spherical shell is |
| A. | Mr2 |
| B. | 1/2 Mr2 |
| C. | 1/3 Mr2 |
| D. | 2/3 Mr2 |
| E. | None of the above |
| Answer» D. 2/3 Mr2 | |
| 268. |
A train travels between two stations 15 km apart in 18 minutes. If the train accelerates for a part of journey uniformly followed by uniform retardation, the maximum speed attained by the train during the journey will by |
| A. | 125 km/hr |
| B. | 107 dynes |
| C. | 80 km/hr |
| D. | 100 km/hr |
| E. | 60 km/hr |
| Answer» D. 100 km/hr | |
| 269. |
A man is standing ner the edge of a uniformly rotating platform about an axis passing through its centre. The speed of rotation of the platorm will decrease if he |
| A. | extends his arms outwards |
| B. | 107 dynes |
| C. | moves towards the axis of rotation |
| D. | jumps out from that platform |
| E. | take out his coat and throws away |
| Answer» A. extends his arms outwards | |
| 270. |
A apinning ballet dancer draws her arms close to her chest. She will now |
| A. | 107 dynes |
| B. | spin at the same rate |
| C. | spin faster |
| D. | spin slower |
| E. | stop spinning |
| Answer» D. spin slower | |
| 271. |
The moment of inertia of a solid sphere of radius r is |
| A. | Mr2 |
| B. | 1/8 Mr2 |
| C. | 2/3 Mr2 |
| D. | m4 |
| E. | 1/2 Mr2 |
| Answer» A. Mr2 | |
| 272. |
A stone of wight 100 kg is thrown vertically upwards by a man of height y = 1.8 m with an initial velocity of 20 m/sec. The maximum height to which it will rise would be |
| A. | 22.2 m |
| B. | 26 m |
| C. | 15.1 m |
| D. | 20.2 m |
| E. | 10 m |
| Answer» A. 22.2 m | |
| 273. |
The breaking strength of a rope is 400 N. A fireman weighing 60 kg slides down the rope. The rope will break if |
| A. | 107 dynes |
| B. | the acceleration is 7.5 m/s2 |
| C. | the acceleration is 1.2 m/s2 |
| D. | the acceleration is 3.1 m/s2 |
| E. | the slides with an acceleration of 15 m/s2 |
| Answer» C. the acceleration is 1.2 m/s2 | |
| 274. |
In case of a beam subjected to pure bending |
| A. | 107 dynes |
| B. | the stress intensity in any fibre is proportional to the distance of the fibre from the neutral axis |
| C. | the stress intensity in any fibre is proportional to the distance of the fibre from the load carrying end |
| D. | the stress intensity in any fibre is uniform |
| E. | the nature of stress in any fibre is identical |
| Answer» B. the stress intensity in any fibre is proportional to the distance of the fibre from the neutral axis | |
| 275. |
A non-reversible machine has efficiency |
| A. | less than 50% |
| B. | nearly 100% |
| C. | between 75% and 99% |
| D. | more than 50% |
| E. | 107 dynes |
| Answer» A. less than 50% | |
| 276. |
The ratio of moment of inertia of a circular body about x axis to that about y axis is |
| A. | ? |
| B. | ? |
| D. | 1?4 |
| E. | 1 |
| Answer» E. 1 | |
| 277. |
A compressure force in boom in above problem is |
| A. | 107 dynes |
| B. | 1096 kg |
| C. | 886 kg |
| D. | 693 kg |
| E. | 1390 kg |
| Answer» E. 1390 kg | |
| 278. |
A body having SHM has period of 6 sec and amplitude of 4 mts. Maximum velocity is |
| A. | ?/3 m/s |
| B. | 2?/3 m/s |
| C. | 107 dynes |
| D. | 3? m/s |
| E. | 4?/3 m/s |
| Answer» E. 4?/3 m/s | |
| 279. |
What is the maximum force, in Newtons, that will not cause tension? |
| A. | 294 |
| B. | 316 |
| C. | 346 |
| D. | 184 |
| E. | 107 dynes |
| Answer» A. 294 | |
| 280. |
Centroid of the are of circle shown in adjacement figure is |
| A. | r sin (?/2)/2 ?, 0 |
| B. | r sin (?)/?, 0 |
| C. | 2 r sin (?/2)/?, 0 |
| D. | 107 dynes |
| E. | 2r sin (?)/?, 0 |
| Answer» C. 2 r sin (?/2)/?, 0 | |
| 281. |
The centroid of the area between the circle x2 + y2 = 16 and the line x + y = 4 will have the coordinates |
| A. | (4, 2) |
| B. | (2, 4) |
| C. | (2.34, 2.34) |
| D. | (1.16, 1.16) |
| E. | None of the above |
| Answer» C. (2.34, 2.34) | |
| 282. |
Polar moment of inertia is |
| A. | Applicable to masses whereas moment of inertia is applicable to area only |
| B. | The moment of inertia for an area ralative to a line or axis which is out the plane of area |
| C. | Same as moment of inertia |
| D. | The moment of inertia for an area relative to a line or axis parallel to the centroidal axis |
| E. | The moment of inertia for an area relative to a line or axis perpendicular to the plane of the area |
| Answer» E. The moment of inertia for an area relative to a line or axis perpendicular to the plane of the area | |
| 283. |
A bullet is fired vertically upwards with a velocity of 2200 ft/s. Bullet ascends to a height of |
| A. | 56,900 ft |
| B. | 107 dynes |
| C. | 75,000 ft |
| D. | 48.300 ft |
| E. | 65,800 ft |
| Answer» C. 75,000 ft | |
| 284. |
In the impact problems the following conditions must always be satisfied |
| A. | The total kinetic energy remains unchanged |
| B. | The total linear momentum remains unchanged |
| C. | The magnitude of the total linear momentum is multiplied by the coefficient of restitution |
| D. | The kinetic energy of the system is reduced by a factor proportional to the coefficient of restitution |
| E. | None of the above |
| Answer» B. The total linear momentum remains unchanged | |
| 285. |
A hammer gains 50 Ns momentum in 0.05 sec. The average force on the hammer will be |
| A. | 500 N |
| B. | 2000 N |
| C. | 1500 N |
| D. | 107 dynes |
| E. | 1000 N |
| Answer» E. 1000 N | |
| 286. |
If the distance to electric train is given by Fr = a + bv + cv2 In this equation constant c is likely to cover |
| A. | air resistance |
| B. | track resistance |
| C. | frictional resistance |
| D. | flange resistance |
| E. | 107 dynes |
| Answer» A. air resistance | |
| 287. |
A man is standing near the edge of a uniformly rotating platform about an axis passing through its centre. The speed of rotation of the platform will decrease if he |
| A. | extends his arms outwards |
| B. | moves towards the axis of rotation |
| C. | jumps out from the platform |
| D. | accepts a heavy bag from one of his friends standing near by and holds it in his hand |
| E. | 107 dynes |
| Answer» D. accepts a heavy bag from one of his friends standing near by and holds it in his hand | |
| 288. |
A stone weighing 20 N is whirling in a vertical circle at the extremity of a string 100 cm long. The tension in the string will be zero |
| A. | at the highest position |
| B. | at the lowest position |
| C. | at the midway position |
| D. | at none of the above |
| E. | 107 dynes |
| Answer» A. at the highest position | |
| 289. |
During planetary motion which of the following remains constant? |
| A. | Augular speed |
| B. | Linear velocity |
| C. | Angular acceleration |
| D. | Total angular momentum |
| E. | All of the above |
| Answer» B. Linear velocity | |
| 290. |
According to principle of transmissiblity of forces, when a force acts upon a body, its effect is |
| A. | maximum when it acts at C.G. of the body |
| B. | minimum when it acts at C.G. of the body |
| C. | different at different points of the body |
| D. | 107 dynes |
| E. | same at every point in its line of action |
| Answer» E. same at every point in its line of action | |
| 291. |
The statement --- if forces acting on a point can be represented in magnitude and direction by the sides of a polygon taken in order then their resultant will be represented in magnitude and direction by the closing side of the polygon taken in opposite order ---- is known as |
| A. | Law of triangle of forces |
| B. | Newton's law of forces |
| C. | Law of polygon of forces |
| D. | D'Alembert's rule |
| E. | Lami's theorem |
| Answer» C. Law of polygon of forces | |
| 292. |
A ball A of mass 0.25 kg moving on a smooth horizontal table with a velocity of 10 m/s strikes an identical stationary ball B on the table. If the impact is perfectly elastic, the velocity of the ball B just after the impact will be |
| A. | 2.5 m/s |
| B. | zero |
| C. | 5 m/s |
| D. | 10 m/s |
| E. | 107 dynes |
| Answer» C. 5 m/s | |
| 293. |
The slope on the road generally provided on the curves is known as |
| A. | Angle of repose |
| B. | Angle of friction |
| C. | Angle of banking |
| D. | Angle of reaction |
| E. | None of the above |
| Answer» C. Angle of banking | |
| 294. |
An automobile weighing 2800 lb and travelling at 30 miles/hr, hits a depression in the road which has a radius of curvature of 50 ft. What is the total force to which springs are subjected. |
| A. | 8230 lb |
| B. | 6170 lb |
| C. | 2800 ib |
| D. | 107 dynes |
| E. | 3280 lb |
| Answer» B. 6170 lb | |
| 295. |
A block A is dropped down a smooth inclined plane, while another identical block B is released for free fall from the same height |
| A. | block A will have higher velocity than block B while hitting the ground |
| B. | block B will hit the ground earlier. |
| C. | both will hit the ground simultaneously |
| D. | block A will hit the ground earlier |
| E. | 107 dynes |
| Answer» B. block B will hit the ground earlier. | |
| 296. |
A projectile is shot straight up with vo = 40 m/s. After how many seconds will it return if drag is neglected? |
| A. | 6 |
| B. | 107 dynes |
| C. | 4 |
| D. | 10 |
| E. | 8 |
| Answer» E. 8 | |
| 297. |
The necessary condition for the forces acting on a body to be in equilibrium is that these should be |
| A. | In the same direction |
| B. | Coplaner |
| C. | Similar in nature |
| D. | Should not meet at a point |
| E. | (B) and (D) above |
| Answer» E. (B) and (D) above | |
| 298. |
A rocket is fired vertically from the ground with a resultant vertical acceleration of 10 m/sec the fuel is finished in one minute and it continues to move up. The maximum height reached will be |
| A. | 2 km |
| B. | 20 km |
| C. | 36 km |
| D. | 10 km |
| E. | 80 km |
| Answer» A. 2 km | |
| 299. |
What force is necessary to hold a weight of 100 kg suspended on a rope wrapped 3 times around a post |
| A. | 0.35 |
| B. | 0.8 |
| C. | 1.46 |
| D. | 2.85 |
| E. | 107 dynes |
| Answer» A. 0.35 | |
| 300. |
At a roller support the line of reaction and the roller base must be at an angle of |
| A. | 60? |
| B. | 90? |
| C. | not less than 60? |
| D. | not more than 60? |
| E. | 107 dynes |
| Answer» B. 90? | |
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