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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.
| 451. |
A ball is dropped on the floor from a height of 10 m. It rebounds to a height of 2.5 m. If the ball is in contact with the floor for 0.01 sec, then average acceleration during contact is |
| A. | \[\text{21}00\text{m}/{{\text{s}}^{\text{2}}}\] |
| B. | \[\text{14}00\text{ m}/{{\text{s}}^{\text{2}}}\] |
| C. | \[\text{7}00\text{ m}/{{\text{s}}^{\text{2}}}\] |
| D. | \[~\text{4}00\text{ m}/{{\text{s}}^{\text{2}}}\] |
| Answer» B. \[\text{14}00\text{ m}/{{\text{s}}^{\text{2}}}\] | |
| 452. |
If two bodies of different masses \[{{m}_{1}}\] and \[{{m}_{2}}\] are dropped from different heights \[{{h}_{1}}\] and \[{{h}_{2}}\], then ratio of the times taken by the two to drop through these distances is |
| A. | \[{{h}_{1}}:{{h}_{2}}\] |
| B. | \[{{h}_{2}}/{{h}_{1}}\] |
| C. | \[{{\sqrt{h}}_{1}}:\sqrt{{{h}_{2}}}\] |
| D. | \[{{h}^{2}}_{1}:{{h}^{2}}_{2}\] |
| Answer» D. \[{{h}^{2}}_{1}:{{h}^{2}}_{2}\] | |
| 453. |
A man shot a bullet with a speed of \[10\,\,m{{s}^{-1}}\] which just penetrates a plank of wood. With what speed should he shoot the bullet so that it passes through \[10\] similar planks? |
| A. | \[100\,\,m\,\,{{s}^{-1}}\] |
| B. | \[104\,\,m\,\,{{s}^{-1}}\] |
| C. | \[10\sqrt{10}m\,\,{{s}^{-1}}\] |
| D. | \[5\sqrt{10}m\,\,{{s}^{-1}}\] |
| Answer» D. \[5\sqrt{10}m\,\,{{s}^{-1}}\] | |
| 454. |
A boat takes 2 hrs. to travel 8 km and back in still water lake with water velocity of 4 km/hr, then the time taken for going upstream of 8 km and coming back is |
| A. | 120 min |
| B. | 160mm |
| C. | 200 min |
| D. | None of these |
| Answer» C. 200 min | |
| 455. |
The motion of an object is plotted in four distance \[-\] time graphs. Which of the following graphs given below correctly describes the possible motion of the object? |
| A. | |
| B. | |
| C. | |
| D. | |
| Answer» E. | |
| 456. |
Sohail cycles on a circular track in anticlockwise direction as shown in the figure. He travels with a speed \['V'\] to cover the path\[AB\], next with speed\['2V'\] from \[B\] to \[C\] and with a speed of\['3V'\] from \[C\] to\[A\]. What is his average speed for the total journey? |
| A. | \[2V\] |
| B. | \[6V\] |
| C. | \[3V\] |
| D. | \[{}^{V}/{}_{2}\] |
| Answer» B. \[6V\] | |
| 457. |
The velocity of a body at any instant is 10 m/s. After 5 sec, velocity of the particle is 20 m/s. The velocity at 3 seconds before is |
| A. | 8 m/sec |
| B. | 4 m/sec |
| C. | 6 m/sec |
| D. | 7 m/sec |
| Answer» C. 6 m/sec | |
| 458. |
A bike accelerates uniformly from rest to a speed of 7.10 m s-1 over a distance of\[35.4\,\,m\]. Determine the acceleration of the bike. |
| A. | \[0.412\,\,m\,\,{{s}^{-2}}\] |
| B. | \[0.512\,\,m\,\,{{s}^{-2}}\] |
| C. | \[0.612\,\,m\,\,{{s}^{-2}}\] |
| D. | \[0.712\,\,m\,\,{{s}^{-2}}\] |
| Answer» E. | |
| 459. |
A stone weighing 3 kg falls from the top of a tower 100 m high and buries itself 2 m deep in the sand. The time of penetration is |
| A. | 0.09 sec |
| B. | 0.9 sec |
| C. | 2.1 sec |
| D. | 1.3 sec |
| Answer» B. 0.9 sec | |
| 460. |
A stone is dropped into a well in which the level of water is h below, the top of the well. If \[v\] is velocity of sound, then time T after which the splash is heard is equal to |
| A. | \[\frac{2h}{v}\] |
| B. | \[\sqrt{\frac{2h}{v}}+\frac{h}{g}\] |
| C. | \[\sqrt{\frac{2h}{g}}+\frac{h}{v}\] |
| D. | \[\sqrt{\frac{h}{2g}}+\frac{2h}{v}\] |
| Answer» D. \[\sqrt{\frac{h}{2g}}+\frac{2h}{v}\] | |
| 461. |
The distance-time graphs of two cyclists moving along a straight line, meet at a point. What can be inferred from this? |
| A. | They collide. |
| B. | They move with the same speed. |
| C. | They are at rest. |
| D. | They start from rest. |
| Answer» B. They move with the same speed. | |
| 462. |
Distance of the moon from the earth is \[\text{4 }\times \text{ 1}{{0}^{\text{8}}}\] m. The time taken by a radar signal transmitted from the earth to reach the moon is |
| A. | 5.2 s |
| B. | 1.3 s |
| C. | 2.6 s |
| D. | 0.70 s |
| Answer» C. 2.6 s | |
| 463. |
A car starts from rest and accelerates uniformly over a time of \[5.21\] seconds for a distance of\[110\,\,m\]. Determine the acceleration of the car. |
| A. | \[6.10\,\,m\,\,{{s}^{-2}}\] |
| B. | \[8.10\,\,m\,\,{{s}^{-2}}\] |
| C. | \[10.10\,\,m\,\,{{s}^{-2}}\] |
| D. | \[12.10\,\,m\,\,{{s}^{-2}}\] |
| Answer» C. \[10.10\,\,m\,\,{{s}^{-2}}\] | |
| 464. |
Driver of a train travelling at 115 km/hr sees on a same track, 100m in front of him, a slow train travelling in the same direction at 25 km/hr. The least retardation that must be applied to faster train to avoid a collision is |
| A. | \[\text{3}.\text{125 m}/{{\text{s}}^{\text{2}}}\] |
| B. | \[\text{3}.\text{5 m}/{{\text{s}}^{\text{2}}}\] |
| C. | \[\text{2}.\text{75 m}/{{\text{s}}^{\text{2}}}\] |
| D. | \[\text{3}.0\text{ m}/{{\text{s}}^{\text{2}}}\] |
| Answer» B. \[\text{3}.\text{5 m}/{{\text{s}}^{\text{2}}}\] | |
| 465. |
What does the area of an 'acceleration- displacement' graph represent? |
| A. | Distance |
| B. | Velocity |
| C. | \[\frac{{{v}^{2}}-{{u}^{2}}}{2}\] |
| D. | \[\frac{v-u}{t}\] |
| Answer» D. \[\frac{v-u}{t}\] | |
| 466. |
If an object covering distances in direct proportion to the square of the time elapsed, then the acceleration is |
| A. | Increasing |
| B. | decreasing |
| C. | Constant |
| D. | none of these |
| Answer» D. none of these | |
| 467. |
The positions of a particle moving along a straight line are \[{{x}_{1}}=50\,\,m\] at 10.30 a.m. and \[{{x}_{2}}=55\,\,m\] m at 10.35 a.m. respectively. What is the displacement of the particle between 10.30 a.m. and 10.35 a.m.? |
| A. | \[2\,\,m\] |
| B. | \[5\,\,m\] |
| C. | \[7\,\,m\] |
| D. | \[9\,\,m\] |
| Answer» C. \[7\,\,m\] | |
| 468. |
A motor ship covers the distance of 300 km between two localities on a river in 10 hrs downstream and in 12 hrs upstream. Find the flow velocity of the river assuming that these velocities are constant. |
| A. | 2.0 km/hr |
| B. | 2.5 km/hr |
| C. | 3 km/hr |
| D. | 3.5 km/hr |
| Answer» C. 3 km/hr | |
| 469. |
How far does the space shuttle travel in the first \[8\] minutes? |
| A. | \[8000\,\,m\] |
| B. | \[80000\,\,m\] |
| C. | \[2016\,\,km\] |
| D. | \[2600\,\,km\] |
| Answer» D. \[2600\,\,km\] | |
| 470. |
The two ends of a train moving with uniform acceleration pass a certain point with velocities \[6\,\,kmph\] and \[8\,\,kmph\] respectively. What is the velocity with which the middle point of the train passes the same point? |
| A. | \[14\,\,kmph\] |
| B. | \[5\,\,kmph\] |
| C. | \[10\sqrt{2}kmph\] |
| D. | \[10\,\,kmph\] |
| Answer» D. \[10\,\,kmph\] | |
| 471. |
A car travels \[\frac{1}{3}\] rd distance on a straight road 0 with a velocity of 10 km/hr, next \[\frac{1}{3}\]rd with velocity 20 km/hr and the last \[\frac{1}{3}\] rd with velocity 60 km/hr. What is the average velocity of the car in the whole journey? |
| A. | 4 km/hr |
| B. | 6 km/hr |
| C. | 12 km/hr |
| D. | 18 km/hr |
| Answer» E. | |
| 472. |
The motion of the earth around the sun once in a year requires some force of attraction between them. What is the centripetal force acting between them? |
| A. | Gravitational force |
| B. | Weight of the sun |
| C. | Weight of the earth |
| D. | Density of the earth |
| Answer» B. Weight of the sun | |
| 473. |
A truck running along a straight line increases its speed uniformly from 30 m/s to 60 m/s over a time interval 1 min. The distance travelled during this time interval is |
| A. | 900m |
| B. | 1800m |
| C. | 2700m |
| D. | 3600 m |
| Answer» D. 3600 m | |
| 474. |
Direction: Questions 24 are based on the information given below. A space shuttle is launched into space. During the first \[8\] minutes of its launch the average acceleration of the shuttle is\[17.5\,\,m\,\,{{s}^{-2}}\]. Ram's car does not start, so his friend helps him by pushing it for \[10\] seconds after which the car reaches a speed of\[2\,\,m\,\,{{s}^{-1}}\]. Calculate the acceleration of the car. |
| A. | \[20\,\,m\,\,{{s}^{-2}}\] |
| B. | \[0.2\,\,m\,\,{{s}^{-2}}\] |
| C. | \[5\,\,m\,\,{{s}^{-2}}\] |
| D. | \[10\,\,m\,\,{{s}^{-2}}\] |
| Answer» C. \[5\,\,m\,\,{{s}^{-2}}\] | |
| 475. |
If a body is thrown vertically upward and rises to a height of 10 m, then time taken by the body to reach the highest point is |
| A. | 1.043s |
| B. | 1.43 |
| C. | 1.024s |
| D. | None of these |
| Answer» B. 1.43 | |
| 476. |
Direction: Questions 24 are based on the information given below. A space shuttle is launched into space. During the first \[8\] minutes of its launch the average acceleration of the shuttle is\[17.5\,\,m\,\,{{s}^{-2}}\]. hat is its speed after \[8\] minutes? |
| A. | \[8000\,\,m\,\,{{s}^{-1}}\] |
| B. | \[8400\,\,m\,\,{{s}^{-1}}\] |
| C. | \[1200\,\,m\,\,{{s}^{-1}}\] |
| D. | \[1500\,\,m\,\,{{s}^{-1}}\] |
| Answer» C. \[1200\,\,m\,\,{{s}^{-1}}\] | |
| 477. |
A body is thrown vertically upwards and rises to a height of 10 m. The velocity with which the body was thrown upwards is \[\left( \text{g }=\text{ 9}.\text{8 m}/{{\text{s}}^{\text{2}}} \right)\] |
| A. | 16 m/s |
| B. | 15 m/s |
| C. | 14 m/s |
| D. | 12m/s |
| Answer» D. 12m/s | |
| 478. |
If a body is thrown up with an initial velocity u and covers a maximum height of A, then h is equal to |
| A. | \[\frac{{{u}^{2}}}{2g}\] |
| B. | \[\frac{u}{2g}\] |
| C. | \[2{{u}^{2}}g\] |
| D. | none of these |
| Answer» B. \[\frac{u}{2g}\] | |
| 479. |
Match the entries in Column-l with those in Column-ll. Column - I Column - II [a] Speed 1. \[cm\] [b] Acceleration 2. \[s\] [c] Displacement 3. \[m\,\,{{s}^{-1}}\] [d] Time 4. \[km\,\,{{h}^{-2}}\] |
| A. | a - 2, b - 1, c - 4, d ? 3 |
| B. | a - 3, b - 4, c - 1, d ? 2 |
| C. | a - 4, b - 2, c - 3, d ? 1 |
| D. | a - 3, b - 2, c - 2, d ? 1 |
| Answer» C. a - 4, b - 2, c - 3, d ? 1 | |
| 480. |
If initial velocity of a particle is u (at t = 0) and the acceleration\[f\]is at, then |
| A. | \[v=u+a{{t}^{2}}\] |
| B. | \[v=u+\frac{a{{t}^{2}}}{2}\] |
| C. | \[v=u+at\] |
| D. | \[v=u\] |
| Answer» C. \[v=u+at\] | |
| 481. |
When will a body have zero speed? |
| A. | When a body has uniform acceleration |
| B. | When a body has non-uniform acceleration |
| C. | When a body is always under rest |
| D. | When a body is always under motion |
| Answer» D. When a body is always under motion | |
| 482. |
A train covers equal displacements in equal intervals of time. Which of the following does it\[NOT\] exhibit? |
| A. | Uniform acceleration |
| B. | Uniform speed |
| C. | Uniform velocity |
| D. | None of the above |
| Answer» E. | |
| 483. |
A particle shows a value of\[46.0\,\,m\,\,{{s}^{-1}}\]. What can it be? |
| A. | Force of the particle |
| B. | Velocity of the particle |
| C. | Acceleration of the particle |
| D. | Momentum of the particle |
| Answer» C. Acceleration of the particle | |
| 484. |
After jumping out from the plane, a parachutist falls 80 m without friction. When he opens up the parachute, he decelerates at\[2\text{ }m\text{ }{{s}^{-2}}\]. He reaches the ground with a speed of\[4m\text{ }{{s}^{-1}}\]. How long did the parachutist spend his time in the air? (Take\[\text{g=10 m }{{\text{s}}^{\text{-2}}}\]) |
| A. | 4s |
| B. | 16 s |
| C. | 18 s |
| D. | 22 s |
| Answer» E. | |
| 485. |
A particle moves along x-axis in such a way that its coordinate (x) varies with time (t) according to the expression, \[x=(2-5t+6{{t}^{2}})m\]. Then the initial velocity of the particle is |
| A. | - 5 m/ sec |
| B. | - 3 m/sec |
| C. | 6 m/sec |
| D. | 3 m/sec |
| Answer» B. - 3 m/sec | |
| 486. |
Which of the following shows the direction of the motion of a body? |
| A. | Velocity |
| B. | Acceleration |
| C. | Speed |
| D. | Both [a] and [b] |
| Answer» E. | |
| 487. |
The diagram shows the velocity-time graph of two moving cars P and Q. The graph indicates that (i) The velocity of car P is increasing at a decreasing rate from 40 s to 45 s in same direction. (ii) Car Q is moving with a constant acceleration from 0 to 20 seconds. (iii) Acceleration of the car Q is not zero at any point during whole journey. (iv) After 20 s, P is behind Q. |
| A. | Only (i) and (ii) |
| B. | Only (ii) and (iii) |
| C. | Only (iii) and (iv) |
| D. | Only (iv) and (i). |
| Answer» B. Only (ii) and (iii) | |
| 488. |
Displacement y (in m) of a body varies with time t (in sec.) as y = \[=\frac{-2}{3}{{t}^{2}}+16t+2\] How long does the body take to come to rest? |
| A. | 8 sec |
| B. | 10 sec |
| C. | 12 sec |
| D. | 16 sec |
| Answer» D. 16 sec | |
| 489. |
An airplane accelerates down a runway at \[3.2\,\,m\,\,{{s}^{-2}}\] for \[32.8\,\,s\] until it finally lifts off the ground. Determine the distance travelled before take-off. |
| A. | \[1323\,\,m\] |
| B. | \[1527\,\,m\] |
| C. | \[1721\,\,m\] |
| D. | \[1931\,\,m\] |
| Answer» D. \[1931\,\,m\] | |
| 490. |
A train starts from a station P with a uniform acceleration \[{{a}_{1}}\], for some distance and then goes with uniform retardation \[{{a}_{2}}\] for some more distance to come to rest at the station Q. The distance between the stations P and Q is 4 km and the train takes 4 minutes to complete this journey, then \[\frac{1}{{{a}_{1}}}+\frac{1}{{{a}_{2}}}=\] |
| A. | \[2\text{ }{{m}^{-1}}\text{ }{{s}^{2}}\] |
| B. | \[4\text{ }{{m}^{-1}}\text{ }{{s}^{2}}\] |
| C. | \[7.2\text{ }{{m}^{-1}}\text{ }{{s}^{2}}\] |
| D. | \[72\text{ }{{m}^{-1}}\text{ }{{s}^{2}}\] |
| Answer» D. \[72\text{ }{{m}^{-1}}\text{ }{{s}^{2}}\] | |
| 491. |
An insect moves along the sides of a wall of dimensions \[12\,\,m\times 5\,\,m\] starting from one corner and reaches the diagonally opposite corner in\[2\,\,s\]. Find the ratio of the average speed to the average velocity of the insect. |
| A. | \[17:13\] |
| B. | \[12:5\] |
| C. | \[13:5\] |
| D. | \[17:12\] |
| Answer» B. \[12:5\] | |
| 492. |
The speed of a train increases at a constant rate \[\alpha \] from zero to v, and then remains constant for an interval, and finally decreases to zero at a constant rate \[\beta \]. If L be the total distance travelled, then the total time taken is |
| A. | \[\frac{L}{v}+\frac{v}{2}\left( \frac{1}{\alpha }+\frac{1}{\beta } \right)\] |
| B. | \[\frac{L}{v}+\frac{2}{v}\left( \frac{1}{\alpha }+\frac{1}{\beta } \right)\] |
| C. | \[\frac{L}{v}+2v\left( \frac{1}{\alpha }+\frac{1}{\beta } \right)\] |
| D. | \[\frac{L}{v}+\frac{1}{v}\left( \frac{1}{\alpha }+\frac{1}{\beta } \right)\] |
| Answer» B. \[\frac{L}{v}+\frac{2}{v}\left( \frac{1}{\alpha }+\frac{1}{\beta } \right)\] | |
| 493. |
A bus in motion increases its speed from \[30\,\,km\,\,{{h}^{-1}}\] to \[60\,\,km\,\,{{h}^{-1}}\] in \[20\] seconds. Find its acceleration. |
| A. | \[0.21\,\,m\,\,{{s}^{-2}}\] |
| B. | \[0.42\,\,m\,\,{{s}^{-2}}\] |
| C. | \[0.63\,\,m\,\,{{s}^{-2}}\] |
| D. | \[0.84\,\,m\,\,{{s}^{-2}}\] |
| Answer» C. \[0.63\,\,m\,\,{{s}^{-2}}\] | |
| 494. |
Two racing cars of masses \[{{m}_{1}}\] and \[{{m}_{2}}\] are moving in circles of radii \[{{r}_{1}}\] and \[{{r}_{2}}\] respectively. Their speeds are such that each makes a complete circle in the same length of time T. The ratio of angular speed of the first car to that of the second car is |
| A. | \[{{m}_{1}}:{{m}_{2}}\] |
| B. | \[{{r}_{1}}:{{r}_{2}}\] |
| C. | \[1:1\] |
| D. | \[{{m}_{1}}{{r}_{1}}:{{m}_{2}}{{r}_{2}}\]. |
| Answer» D. \[{{m}_{1}}{{r}_{1}}:{{m}_{2}}{{r}_{2}}\]. | |
| 495. |
Area under a velocity-time graph gives |
| A. | Time taken by a moving object |
| B. | Distance travelled by a moving object |
| C. | Acceleration of moving object |
| D. | Retardation of a moving object |
| Answer» C. Acceleration of moving object | |
| 496. |
How do the directions of velocity and acceleration act when brakes are applied to a moving cycle? |
| A. | Opposite to each other |
| B. | In the same direction |
| C. | Perpendicular to each other |
| D. | Parallel to each other |
| Answer» B. In the same direction | |
| 497. |
A boy takes 5 seconds to reach each point from A to B, B to C and C to D as shown in the diagram. If AB = BC = CD = 20 m then which of the following information is correct when the boy reaches point D from point A? |
| A. | Velocity \[(m\text{ }{{s}^{-1}})\] Speed \[(m\text{ }{{s}^{-1}})\] 4 4 |
| B. | Velocity \[(m\text{ }{{s}^{-1}})\] Speed \[(m\text{ }{{s}^{-1}})\] 1.33 1.33 |
| C. | Velocity \[(m\text{ }{{s}^{-1}})\] Speed \[(m\text{ }{{s}^{-1}})\] 4 1.33 |
| D. | Velocity \[(m\text{ }{{s}^{-1}})\] Speed \[(m\text{ }{{s}^{-1}})\] 1.33 4 |
| Answer» E. | |
| 498. |
The velocity-time graph for a body with non-uniform motion is a straight line |
| A. | Straight line |
| B. | Straight line parallel to \[x\]-axis |
| C. | Straight line parallel to y-axis |
| D. | Curved line |
| Answer» E. | |
| 499. |
A body travels \[200\,\,cm\] in the first two seconds and \[220\,\,cm\] in the next four seconds with constant acceleration. Find the velocity at the end of the seventh second from the start. |
| A. | \[5\,\,cm\,\,{{s}^{-1}}\] |
| B. | \[10\,\,cm\,\,{{s}^{-1}}\] |
| C. | \[15\,\,cm\,\,{{s}^{-1}}\] |
| D. | \[20\,\,cm\,\,{{s}^{-1}}\] |
| Answer» C. \[15\,\,cm\,\,{{s}^{-1}}\] | |
| 500. |
In the given figure, velocity of the body at A is |
| A. | Zero |
| B. | unity |
| C. | Maximum |
| D. | infinite |
| Answer» B. unity | |