Explore topic-wise MCQs in 9th Class.

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