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MCQOPTIONS
This section includes 1777 Mcqs, each offering curated multiple-choice questions to sharpen your 9th Class knowledge and support exam preparation. Choose a topic below to get started.
| 1201. |
A block of mass m, attached to a spring of spring constant k, oscillates on a smooth horizontal table. The other end of the spring is fixed to a wall. If it has a speed v when the spring is at its natural length, how far will it move on the table before coming to an instantaneous rest |
| A. | \[\sqrt{\frac{\upsilon m}{k}}\] |
| B. | \[\sqrt{\frac{\upsilon k}{m}}\] |
| C. | \[u\sqrt{\frac{k}{m}}\] |
| D. | \[u\sqrt{\frac{m}{k}}\] |
| Answer» E. | |
| 1202. |
Action and reaction act on |
| A. | Same body in opposite directions |
| B. | Same body in the same direction |
| C. | Different bodies in opposite directions |
| D. | Different bodies but in the same direction |
| Answer» D. Different bodies but in the same direction | |
| 1203. |
A cricket ball of mass 150 gram moving with a velocity of 12 m/s strikes against the bat. It renounces with a velocity of 20 m/s. The ball remains in touch with the bat for 0.01 second. The average force applied by the bat on the ball is |
| A. | 840 Newton |
| B. | 480 Newton |
| C. | 804 Newton |
| D. | 408 Newton |
| Answer» C. 804 Newton | |
| 1204. |
Two freely hanging weights, each having a mass of 60 gm, are connected by a light thread which passes over a fixed pulley. The mass of the pulley and frictional losses are negligible. If a 10 gm weight is now added to one of the weights, its downward acceleration, in\[\text{cm}/\text{se}{{\text{c}}^{\text{2}}}\], will be approximately |
| A. | 32 |
| B. | 80 |
| C. | 106 |
| D. | 980 |
| Answer» C. 106 | |
| 1205. |
Match column I with column II and select the correct option. Column I Column II (a) Flight of rockets (i) Inertia of direction (b) Function of mud guards over the wheels of a motor bike (ii) Inertia of rest (c) Firing a bullet from gun (iii) Newton?s third law of motion (d) Dust particles fall when a durree is beaten with a stick (iv) Law of conservation of linear momentum. |
| A. | (a) - (iii); (b) - (i, ii); (c) - (ii); (d) - (iv) |
| B. | (a) - (ii); (b) - (iii); (c) - (i, ii); (d) - (iv) |
| C. | (a) - (iii, iv); (b) - (i); (c) - (iii, iv); (d) - (ii) |
| D. | (a) - (i); (b) - (ii); (c) - (iv); (d) - (iii, iv) |
| Answer» D. (a) - (i); (b) - (ii); (c) - (iv); (d) - (iii, iv) | |
| 1206. |
An alpha-particle is emitted by U238 nucleus with a speed of \[\text{1}.\text{5 x 1}{{0}^{\text{7}}}\] m/sec. The recoil speed of the remaining nucleus will be |
| A. | \[\text{2}.\text{4 x 1}{{0}^{\text{5}}}\text{ m}/\text{sec}\] |
| B. | \[0.\text{24 x 1}{{0}^{\text{5}}}\text{ m}/\text{sec}\] |
| C. | \[\text{24 x 1}{{0}^{\text{5}}}\text{ m}/\text{sec}\] |
| D. | \[\text{245 x 1}{{0}^{\text{5}}}\text{ m}/\text{sec}\] |
| Answer» B. \[0.\text{24 x 1}{{0}^{\text{5}}}\text{ m}/\text{sec}\] | |
| 1207. |
A body is freely released from point A so that it slides down the smooth inclined plane AB and then along the rough horizontal surface BC and comes to point C with 4 m/sec. Then the coefficient of friction over the rough surface is |
| A. | 0.2 |
| B. | 0.4 |
| C. | 0.65 |
| D. | 0.75 |
| Answer» C. 0.65 | |
| 1208. |
A body of mass 2 kg is initially moving with a velocity of 4 m/sec. Now a force of 1.25 Newtons acts for 8 sec. Then a force of 2.5 N acts for 8 sec. The final velocity of the body is |
| A. | 12.55 m/sec |
| B. | 17 m/sec |
| C. | 19 m/sec |
| D. | 25 m/sec |
| Answer» D. 25 m/sec | |
| 1209. |
Two masses m and 2m are attached with each other by a rope passing over a frictionless and massless pulley. If the pulley is accelerated upwards with an acceleration a, what is the value of T ? |
| A. | \[\frac{g+a}{3}\] |
| B. | \[\frac{g-a}{3}\] |
| C. | \[\frac{4m(g+a)}{3}\] |
| D. | \[\frac{m(g-a)}{3}\] |
| Answer» D. \[\frac{m(g-a)}{3}\] | |
| 1210. |
A bucket containing water of depth 15 cm is kept in a lift which is moving upwards with an acceleration 2 g. The pressure at the bottom of the bucket is |
| A. | \[\text{1}0\text{ g dyne c}{{\text{m}}^{\text{-2}}}\] |
| B. | \[\text{2 dyne c}{{\text{m}}^{\text{-2}}}\] |
| C. | \[\text{4}0\text{ g dyne c}{{\text{m}}^{\text{-2}}}\] |
| D. | \[\text{45 g dyne c}{{\text{m}}^{\text{-2}}}\] |
| Answer» E. | |
| 1211. |
A man weighing 80 kg is standing in a trolley weighing 320 kg. The trolley is resting on frictionless horizontal rails. If the man starts walking on the trolley with a speed of 1 m/s, then after 4 sec his displacement relative to the ground will be |
| A. | 5 m |
| B. | 4.8 m |
| C. | 3.2m |
| D. | 3.0 m |
| Answer» D. 3.0 m | |
| 1212. |
A truck and a car moving with same kinetic energy are stopped by equal retarding force. Which of them will be stopped in shorter distance? |
| A. | Truck |
| B. | Car |
| C. | Both simultaneously |
| D. | Data not sufficient |
| Answer» D. Data not sufficient | |
| 1213. |
A plank, 8 m long, has one end 1 m higher than the other. What minimum force parallel to the plank will be necessary to push a box up it, the box and its contents having a mass of 100 kg and the coefficient of sliding friction between it and the plank being 0.3 ? |
| A. | 50.2 kgf |
| B. | 25.5 kgf |
| C. | 75.0 kgf |
| D. | 42.3 kgf |
| Answer» E. | |
| 1214. |
In the first second of its flight, a rocket ejects 1 /40 of its mass with a velocity of \[1200\text{ }m\text{ }{{s}^{-1}}\]. The acceleration of the rocket is |
| A. | \[20\text{ }m\text{ }{{s}^{-2}}\] |
| B. | \[30\text{ }m\text{ }{{s}^{-2}}\] |
| C. | \[40\text{ }m\text{ }{{s}^{-2}}\] |
| D. | \[60\text{ }m\text{ }{{s}^{-2}}\] |
| Answer» C. \[40\text{ }m\text{ }{{s}^{-2}}\] | |
| 1215. |
Which of the following graphs shows the graph between velocity (v) and mass (m) when linear momentum (p) is constant? |
| A. | |
| B. | |
| C. | |
| D. | |
| Answer» D. | |
| 1216. |
A man is standing on a boat in still water If he walks towards the shore the boat will |
| A. | Move away from the shore |
| B. | Remain stationary |
| C. | Move towards the shore |
| D. | Sink |
| Answer» B. Remain stationary | |
| 1217. |
A force acting on a particle of mass \[200\] displaces it through \[400\,\,cm\] in \[2\] seconds. Find the magnitude of the force if the initial velocity of the particle is zero. |
| A. | \[0.1\,\,N\] |
| B. | \[0.3\,\,N\] |
| C. | \[0.4\,\,N\] |
| D. | \[0.5\,\,N\] |
| Answer» D. \[0.5\,\,N\] | |
| 1218. |
Which of the following is not a perfectly inelastic collision? |
| A. | Striking of two glass balls |
| B. | A bullet striking a bag of sand |
| C. | An electron captured by a proton |
| D. | A man jumping into a moving cart |
| Answer» B. A bullet striking a bag of sand | |
| 1219. |
A bullet fired into a wall loses half of its velocity after penetrating 3 cm. Further it can penetrate a maximum of |
| A. | 3 cm |
| B. | 2 cm |
| C. | 1cm |
| D. | 0.5cm |
| Answer» D. 0.5cm | |
| 1220. |
A diwali rocket is ejecting 0.05 kg of gases per second at a velocity of 400 m/sec. The accelerating force on the rocket is |
| A. | 20 dynes |
| B. | 20 Newtons |
| C. | 20 kg wt |
| D. | 10 Newtons |
| Answer» C. 20 kg wt | |
| 1221. |
A block of mass 1 kg moving with a speed of \[\text{2 m}{{\text{s}}^{\text{-1}}}\]collides with and sticks to another block of mass 2 kg which was initially at rest. After the collision |
| A. | The momentum of the system is less than \[\text{2}\,\text{kg}\,\text{m}{{\text{s}}^{-\text{1}}}\]9 |
| B. | The kinetic energy of the system is\[\frac{2}{3}J\] |
| C. | The kinetic energy of the system is \[2J\] |
| D. | None of these |
| Answer» C. The kinetic energy of the system is \[2J\] | |
| 1222. |
A bullet of mass \[{{m}_{1}}\] is fired into a block mass \[{{m}_{2}}\] suspended like a pendulum. The block, initially at rest, is raised to a height h, after the impact. The velocity of the bullet is |
| A. | \[\left( 1+\frac{{{m}_{1}}}{{{m}_{2}}} \right)\sqrt{gh}\] |
| B. | \[\frac{{{m}_{1}}}{{{m}_{2}}}\sqrt{2gh}\] |
| C. | \[\left( 1+\frac{{{m}_{1}}}{{{m}_{2}}} \right)\sqrt{2gh}\] |
| D. | \[\left( 1+\frac{{{m}_{2}}}{{{m}_{1}}} \right)\sqrt{2gh}\] |
| Answer» E. | |
| 1223. |
The mass of a body measured by a physical balance in a lift at rest is found to be m. If the lift is going up with an acceleration a, its mass will be measured as |
| A. | \[m\left( 1-\frac{a}{g} \right)\] |
| B. | \[\left( 1+\frac{a}{g} \right)\] |
| C. | \[m\] |
| D. | Zero |
| Answer» D. Zero | |
| 1224. |
A particle of mass 100 g is suspended from a light string. The string is moved [a] Upwards, and [b] Downwards with an acceleration of\[\text{5 m}/{{\text{s}}^{\text{2}}}\]. If \[{{T}_{u}}\] and \[{{T}_{d}}\] are the tension in the string during upward and downward motion respectively, then \[{{T}_{u}}-{{T}_{d}}\] is equal to |
| A. | 1N |
| B. | 0.5 N |
| C. | 0.98 N |
| D. | 1.96 N |
| Answer» B. 0.5 N | |
| 1225. |
A force of 0.6 N acting on a particle increases its velocity from 5.0 m s~1 to 6.0 m s-1 in 2 s. What is the mass of the particle? |
| A. | \[1.2\,\,kg\] |
| B. | \[2.2\,\,kg\] |
| C. | \[4.2\,\,kg\] |
| D. | \[6.2\,\,kg\] |
| Answer» B. \[2.2\,\,kg\] | |
| 1226. |
A body rests on a rough horizontal plane. A force is applied to the body directed towards the plane at an angle \[\phi \]with the vertical. The body can be moved along the plane. |
| A. | Only \[\phi \]is more than the angle of friction |
| B. | Only \[\phi \] is less than the angle of friction |
| C. | Only \[\phi \] is equal to the angle of friction |
| D. | For all values of \[\phi \] |
| Answer» B. Only \[\phi \] is less than the angle of friction | |
| 1227. |
An iron ball and a wooden ball of the same radius are released from a height H in vacuum. The times taken by both of them of reach the ground are |
| A. | Roughly equal |
| B. | Unequal |
| C. | Exactly equal |
| D. | In the inverse ratio of their diameters |
| Answer» D. In the inverse ratio of their diameters | |
| 1228. |
In the above question, the minimum force required to move the block up the plane at this inclination is |
| A. | 30 N |
| B. | 40 N |
| C. | 60 N |
| D. | 120 N |
| Answer» D. 120 N | |
| 1229. |
A block of mass 5 kg is placed on a rough inclined plane. The inclination of the lane is gradually increased till the block just begin to slide down The inclination of the plane is then 3 in 5 The coefficient of friction between the block and the plane is \[\left( \text{g}=\text{ 1}0\text{ m}/{{\text{s}}^{\text{2}}} \right)\] |
| A. | 3/5 |
| B. | 3/4 |
| C. | 4/5 |
| D. | 2/3 |
| Answer» C. 4/5 | |
| 1230. |
A monkey of mass 40 kg climbs on a massless rope of breaking strength 600 N. The rope will break if the monkey \[\left( \text{g}=\text{1}0\text{ m}/{{\text{s}}^{\text{2}}} \right)\] |
| A. | Climbs up with a uniform speed of 5 m/s |
| B. | Climbs up with an acceleration of \[\text{6 m}/{{\text{s}}^{\text{2}}}\] |
| C. | Climbs down with an acceleration of \[\text{4 m}/{{\text{s}}^{\text{2}}}\] |
| D. | Climbs down with a uniform speed of \[\text{5 m}/\text{s}\] |
| Answer» C. Climbs down with an acceleration of \[\text{4 m}/{{\text{s}}^{\text{2}}}\] | |
| 1231. |
A body is projected up a \[40{}^\circ \] rough inclined plane. If the coefficient of friction is 0-5, then the retardation of the block is |
| A. | \[\frac{g}{2\sqrt{2}}\] |
| B. | \[\frac{g}{\sqrt{2}}\] |
| C. | \[\frac{3g}{2\sqrt{2}}\] |
| D. | \[\frac{g}{2}\] |
| Answer» B. \[\frac{g}{\sqrt{2}}\] | |
| 1232. |
The minimum acceleration with which a fireman slide down a rope of breaking strength two-third of his weight is |
| A. | Zero |
| B. | \[\frac{g}{3}\] |
| C. | \[\frac{2g}{3}\] |
| D. | \[g\] |
| Answer» C. \[\frac{2g}{3}\] | |
| 1233. |
A block of mass 9 kg, lying on a frictionless table is connected to a block of mass 1 kg by means of a string which passes over a frictionless pulley as shown. The tension in the string is \[\left( \text{g}=\text{1}0\text{ m}/{{\text{s}}^{\text{2}}} \right)\] |
| A. | 1N |
| B. | 4N |
| C. | 7N |
| D. | 9N |
| E. | None of these |
| Answer» F. | |
| 1234. |
Two blocks A and B, having masses m, and m respectively, are placed in contact on a smooth horizontal surface. A force F is applied horizontally on A. The contact force between A and B is |
| A. | \[\frac{{{m}_{1}}}{{{m}_{2}}}F\] |
| B. | \[\frac{{{m}_{2}}}{{{m}_{1}}}F\] |
| C. | \[\frac{{{m}_{1}}F}{{{m}_{1}}+{{m}_{2}}}\] |
| D. | \[\frac{{{m}_{2}}F}{{{m}_{1}}+{{m}_{2}}}\] |
| Answer» E. | |
| 1235. |
The mass of balloon and its contents is M It is descending with an acceleration a. By how much the mass should be decreased, keeping the volume constant, so that the balloon starts ascending with the same acceleration? |
| A. | \[\frac{a}{a+g}M\] |
| B. | \[\frac{g}{a+g}M\] |
| C. | \[\frac{2a}{a+g}M\] |
| D. | \[\frac{2g}{a+g}M\] |
| Answer» D. \[\frac{2g}{a+g}M\] | |
| 1236. |
A ball is rolling down a slope at a steady speed. Which of the following statements is correct? |
| A. | Frictional force is greater than the forward force. |
| B. | There is an unbalanced force downwards. |
| C. | There are no forces acting on the ball. |
| D. | The forces acting on the ball are balanced. |
| Answer» E. | |
| 1237. |
Direction: Read the passage carefully and answer the following question.An object of mass 1.5 kg travelling in a straight line with a velocity of \[5\text{ }m\text{ }{{s}^{-1}}\] collides with a wooden block of mass 5 kg resting on the floor.This object sticks with wooden block after collision and both move together in a straight line.The velocity of the combination of these objects after collision is |
| A. | \[8.5\text{ }m\text{ }{{s}^{-1}}\] |
| B. | \[9.5\text{ }m\text{ }{{s}^{-1}}\] |
| C. | \[1.15\,\,m\,\,{{s}^{-1}}\] |
| D. | \[1.5\,\,m\,\,{{s}^{-1}}\] |
| Answer» D. \[1.5\,\,m\,\,{{s}^{-1}}\] | |
| 1238. |
In the above problem, acceleration of the system is |
| A. | \[\text{4}.\text{9 m}/{{\text{s}}^{\text{2}}}\] |
| B. | \[\text{2}.\text{94 m}/{{\text{s}}^{\text{2}}}\] |
| C. | \[\text{1}.\text{4 m}/{{\text{s}}^{\text{2}}}\] |
| D. | \[\text{9}.\text{8 m}/{{\text{s}}^{\text{2}}}\] |
| Answer» D. \[\text{9}.\text{8 m}/{{\text{s}}^{\text{2}}}\] | |
| 1239. |
A force acts on a body of mass\[200\,\,g\]. The velocity of the body changes from \[15\,\,m\,\,{{s}^{-1}}\] to \[25\,\,m\,\,{{s}^{-1}}\] in\[2.5\,\,s\]. What is magnitude of the force, assuming the force to be constant? |
| A. | \[0.4\,\,N\] |
| B. | \[0.5\,\,N\] |
| C. | \[0.6\,\,N\] |
| D. | \[0.8\,\,N\] |
| Answer» E. | |
| 1240. |
The action and reaction forces referred to in Newton's third law of motion |
| A. | Must act on same body |
| B. | Must act on different bodies need not be equal in magnitude but must have |
| C. | The same line of action |
| D. | Must be equal in magnitude but need not have the same line of action |
| Answer» C. The same line of action | |
| 1241. |
An unbalanced force acts on a body. What happens to the body? |
| A. | The body remains at rest. |
| B. | The body must move with uniform velocity. |
| C. | The body is accelerated. |
| D. | The body moves along a circle. |
| Answer» D. The body moves along a circle. | |
| 1242. |
While flying, the birds push the air |
| A. | Upward |
| B. | Downward |
| C. | Sideward |
| D. | Backward |
| Answer» C. Sideward | |
| 1243. |
If the weight of a person on the surface of the earth is 600N, then his weight on the surface the moon is. |
| A. | 600 N |
| B. | 50 N |
| C. | 100 N |
| D. | Zero |
| Answer» D. Zero | |
| 1244. |
Which of the following is the unit of linear momentum? |
| A. | kg m/s |
| B. | kg ms |
| C. | \[\text{kg}\,\text{m}{{\text{s}}^{-\text{2}}}\] |
| D. | kg |
| Answer» C. \[\text{kg}\,\text{m}{{\text{s}}^{-\text{2}}}\] | |
| 1245. |
A cyclist does not come to rest immediately after he stops pedaling due to the |
| A. | Inertia of rest |
| B. | Inertia of motion |
| C. | Inertia of direction |
| D. | None of the above |
| Answer» D. None of the above | |
| 1246. |
While dusting a carpet we suddenly jerk or beat it with a stick because |
| A. | Inertia of rest keeps the dust in its position and the dust is removed by moment of the carpet away |
| B. | Inertia of motion removes the dirt. |
| C. | No inertia is involved in it due to practical experience |
| D. | None of these |
| Answer» B. Inertia of motion removes the dirt. | |
| 1247. |
A vehicle of mass 120 kg is moving with a uniform velocity of 108 km/h. The force required to stop the vehicle in 10s is : |
| A. | \[\text{12}0\times \text{l}0.\text{8}\,\text{N}\] |
| B. | 180 N |
| C. | 720 |
| D. | 360 N |
| Answer» E. | |
| 1248. |
A ball of mass 100 g is moving with a velocity of 10 m/s and hits a bat and rebounds with a velocity of 10 m/s. The force of the blow by the bat acts for 0.01 s. The average force exerted on the ball b the bat is |
| A. | 50 N |
| B. | 100 N |
| C. | 200 N |
| D. | zero |
| Answer» D. zero | |
| 1249. |
A ship of mass \[\text{3}\times \text{1}{{0}^{\text{7}}}\] kg, initially at rest, is pulled by a force of \[\text{5}\times \text{1}{{0}^{\text{4}}}\] through a distance of 3m. Assuming that the resistance due to water is negligible, the speed of the ship is : |
| A. | 1.5 m/s |
| B. | 60 m/s |
| C. | 0.1 m/s |
| D. | 5 m/s |
| Answer» D. 5 m/s | |
| 1250. |
The average force that is necessary to stop a hammer with a momentum of 25 Ns in 0.05 s, is about |
| A. | 500 N |
| B. | 125 N |
| C. | 50 N |
| D. | 25 N |
| Answer» B. 125 N | |