Loading [MathJax]/jax/output/CommonHTML/jax.js

CBSE Questions for Class 9 Physics Motion Quiz 4 - MCQExams.com

A ball is thrown vertically upwards with a speed of 10 ms1 from the ground at the bottom of a tower 200 m high. Another is dropped vertically downward simultaneously, from the top of a tower. If g=10 ms2 the time interval after which the projected body will be at the same level as the dropped body is:
  • 20 s
  • 25 s
  • 210s
  • 5 s
A stone is dropped from the top of a tower of height 49 m. Another stone is thrown up vertically with velocity of 24.5 m/s from the foot of the tower at the same instant. They will meet in a time of
  • 1 s
  • 2 s
  • 0.5 s
  • 0.25 s
Two balls A and B are thrown simultaneously. A vertically upwards at a speed of 15 m/s from the ground and B, vertically downwards from a height of 30 m at the same speed along the same line of motion. They meet after a time of: 
  • 1 s
  • 2 s
  • 3 s
  • 4 s
A body is projected vertically upwards with a velocity u. It crosses a point in its journey at a height h meter twice, just after 1 and 7 seconds .The value of u in ms1 is (g=10ms2)
  • 50
  • 40
  • 30
  • 20
An object may have 
  • varying speed without having varying velocity
  • varying velocity without having varying speed
  • non zero acceleration without having varying velocity
  • non zero acceleration without having varying speed
The displacement (x) versus time (t) curve for two particles is as shown in figure. Which of the following statements is correct for time interval between 0 to 10 s?

2672.png
  • The particle A is speeding up while B is slowing down.
  • Both the particles are initially speeding up and then slowing down.
  • Both the particles are initially slowing down and then speeding up.
  • Particle A is speeding up first and then slowing down while B is slowing down first and then speeding up.
A stone is thrown vertically up from the ground. It reaches a maximum height of 50 m in 10 s. After what time will it reach the ground from the maximum height?
  • 5 s
  • 10 s
  • 20 s
  • 25 s
A body moving with uniform acceleration in a straight line is at points A, B, C, D after successive equal intervals of time. The distance AD is equal to:
  • BC
  • 2(BC)
  • 3(BC)
  • 4(BC)
A ball is released from the top of a tower of height h m. It takes T seconds to reach the ground. What is the position of the ball in T3 second?
  • h9 metres from the ground
  • 7h9 metres from the ground
  • 8h9 metres from the ground
  • 17h18 metres from the ground
Two bodies, A(of mass 1kg) and B(of mass 3kg),are dropped from heights of 16 m and 25 m respectively. The ratio of the time taken by them to reach the ground is:-
  • 54
  • 125
  • 512
  • 45
A particle starts with a velocity 200 cm/s and moves in a straight line with a retardation of 10 cm/s2. Its displacement will be 1500 cm:
  • Only once at 30 s from start
  • Only once at 10 s
  • Twice at 10 s and 30 s
  • Always
The displacement-time graph of motion of a particle is shown in the figure. The ratio of the magnitudes of the speeds during the first two seconds and the next four seconds is:

2687.jpg
  • 1:1
  • 1:2
  • 2:1
  • 1:2
A wooden block of mass 10 gm is dropped from the top of a cliff 100 m high. Simultaneously a bullet of mass 10 gm is fired from the foot of the cliff  upward with a velocity 100 m/s. The bullet and the wooden block will meet each other after a time of:
  • 10 s
  • 0.5 s
  • 1 s
  • 7 s
A ball is released from the top of a tower of height h m. It takes T s to reach the ground. What is the position of the ball in T3 s?
  • h9 m from the ground
  • 7h9 m from the ground
  • 8h9 m from the ground
  • 17h18 m from the ground
Suppose a boy is enjoying a ride on a merry-go-round which is moving with a constant speed of 10 ms1. It implies that the boy is :
  • at rest
  • moving with no acceleration
  • in accelerated motion
  • moving with uniform velocity

A ball is thrown upwards. It takes 4 s to reach back to the ground. Find its initial velocity.

  • 30ms1
  • 10ms1
  • 40ms1
  • 20ms1

A boy standing at the top of a tower of 20 m height drops a stone. Assuming g=10ms2, the velocity with which it hits the ground is:

  • 20ms1
  • 40ms1
  • 5ms1
  • 10ms1
A body is thrown vertically upwards with a velocity u, the greatest height h to which it will rise is:
  • u/g
  • u2/2g
  • u2/g
  • u/2g

The velocity of a bullet is reduced from 100 m/s to 0 m/s while travelling through a wooden block of thickness 10 cm. The retardation, assuming it to be uniform will be:

  • 5×104 m/s2
  • 12×104 m/s2
  • 14×104 m/s2
  • 1×104 m/s2
Two objects of masses m1 and m2 having the same size are dropped simultaneously from heights h1 and h2 respectively. Find out the ratio of time they would take in reaching the ground.
  • h1h2.
  • h2h1.
  • h1h2.
  • h2h1.
A particle is moving in a circular path of radius r. The magnitude of displacement after half a circle would be :
  • Zero
  • πr 
  • 2r
  • 2πr 

A ball is dropped from height h and another from 2h. The ratio of time taken by the two balls to reach ground is:

  • 1:2
  • 2:1
  • 2:1
  • 1:2
A particle starts its motion from rest under the action of a constant force. If the distance covered in first 10 seconds is S1 and that covered in the first 20 seconds is S2 then:
  • S2 = S1
  • S2 = 2S1
  • S2 = 3S1
  • S2 = 4S1

If a body is thrown up with the velocity of 15m/s, then maximum height attained by the body is (g=10 m/s2)

  • 11.25m
  • 16.2m
  • 24.5m
  • 7.62m
An electron starting from rest has a velocity that increases linearly with time,i.e. v=kt where k=2 m/s2. The distance covered in the first three seconds will be
  • 36m
  • 27m
  • 18m
  • 9m
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
(assume uniform accelaration)
  • 8 m/sec
  • 4 m/sec
  • 6 m/sec
  • 7 m/sec

In the velocity-time graph, AB shows that the body has
95921_07f4d44822af41a582688de53e27cf4a.png
  • uniform acceleration
  • non-uniform retardation
  • uniform speed
  • initial velocity OA and is moving with uniform retardation

In the graph provided, the velocity
96028_262b10064fa043bc8f46d1fca46636e5.png
  • increases between point 0 and A
  • increases between point A and B
  • decreases between points A and B
  • is zero throughout
N/kg is the unit of :
  • Retardation
  • Acceleration
  • Rate of change of velocity
  • All of these
A girl walks along a straight path to drop a letter in the letterbox and
comes back to her initial position. Her displacement-time graph is shown in the figure. Find the average velocity.

78412_36bbb430c5664bb181623e636ae63917.png
  • 1 m/s
  • 2 m/s
  • -2 m/s
  • 0 m/s
The rate of change of displacement with time is
  • speed
  • acceleration
  • retardation
  • velocity
Rain is falling vertically with a speed of 1.7 m/s. A girl is walking with speed of 1.0 m/s in the N - E (north-east) direction. To shield herself she holds her umbrella making an approximate angle θ with the vertical in a certain direction. Then


  • θ=600inNEdirection
  • θ=300inNEdirection
  • θ=600inSWdirection
  • θ=300inSWdirection
A particle is moving in a circular path of radius r. Its displacement after moving through half the circle would be :
  • Zero
  • r
  • 2r
  • 2r
Two balls are dropped from height h1 and h2 respectively. What is the ratio of their velocities on reaching the ground is?
  • h2h1
  • h1h2
  • h2h1
  • h1h2
A body starting from rest in travelling with an acceleration of 6m/s2. Find the distance traveled by it in 6th second.
  • 36 mts
  • 28 mts
  • 54 mts
  • 33 mts
From kinematics, correct equation of motion for S is/are :
  • S=ut12at2
  • S=ut+12at2
  • Both (a) and (b)
  • None of these
Speed of a body depends on 
  • Time 
  • Mass of the body 
  • Distance travelled by the body 
  • Both A and C
A particle is projected up with a velocity of  29 ms1 from a tower of height 10m. Its velocity on reaching the ground is    x  ms1. Find x.
  • 5
  • 10
  • 15
  • 20
Average speed of a body is
  • Total Distance ÷ Total Time
  • Total Distance + Total Time
  • Both (a) and (b)
  • None of these
If a body is thrown up with an initial velocity u and covers a maximum height of h, then h is equal to
  • u22g
  • u2g
  • 2u2g
  • None of these
A stone is projected up with a velocity of 4.9 m/s from the top of a tower and it reaches the ground after 3 s. Then the height of that tower is
  • 4.9 m
  • 19.6 m
  • 9.8 m
  • 29.4 m
If an object is thrown vertically up with a velocity of 19.6 ms1, it strikes the ground after x second, find x
  • 1
  • 2
  • 4
  • 8
The relationship between average speed, time and distance is
  • Average speed = distance × time
  • Average speed =total distancetotal time
  • Time=average speeddistance
  • Distance=average speed ×time
A freely falling body from rest acquires velocity V falling through a distance h. After the body falls through a further distance h velocity acquired by it is
  • 2v
  • v
  • 2v
  • 4v
An object is thrown vertically upward with a velocity of 10 ms1. It strikes the  ground after _______ seconds. (Take g=10 ms2)
  • 10
  • 2
  • 5
  • 1
A stone is dropped from a rising balloon at a height of 300 m above the ground and it reaches the ground in 10 s. The velocity of the balloon when it was dropped is :
  • 19ms1
  • 19.6ms1
  • 29ms1
  • 0ms1
An object is released from a balloon rising up with a constant speed of 2 ms1. Its magnitude of velocity after 1 s in  ms1 is
  • 5.3
  • 7.8
  • 2.8
  • 6.4
When a body is projected vertically up from the ground its velocity is reduced to 14th of its velocity at ground at height h. Then the maximum height reached by the body is
  • 1532h
  • 1516h
  • 158h
  • 54h
A car travels with a uniform velocity of 25ms1 for 5 s. The brakes are then applied and the car is uniformly retarded and comes to rest in further 10 s. Find the acceleration.
  • 5ms2
  • 2.5ms2
  • 25ms2
  • 10ms2
A body projected vertically up with a velocity of 10 m s1 reaches a height of 20 m. If it is projected with a velocity of 20 m s1, then the maximum height reached by the body is :
  • 20 m
  • 10 m
  • 80 m
  • 40 m
0:0:2


Answered Not Answered Not Visited Correct : 0 Incorrect : 0

Practice Class 9 Physics Quiz Questions and Answers