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CBSE Questions for Class 9 Physics Motion Quiz 8 - MCQExams.com

A displacement-time graph of a body moving with uniform velocity is shown in the figure. Find out its velocity and its displacement at the end of 5 seconds.
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  • 10 m/s, 125 m
  • 5 m/s, 225 m
  • 3m/s, 15 m
  • 15 m/s, 75 m
A ball is thrown vertically upwards from the top of a tower with a velocity of 10ms1. The ball reaches the ground with the velocity 30ms1. What is the height of the tower? (Takeg=10ms2)
  • 40 m
  • 20 m
  • 60 m
  • 80 m
A body whose speed in a particular direction is constant
  • must be accelerating
  • must be retarding
  • has a constant velocity
  • all the above
The final velocity of a body starting from rest and moving with an acceleration \displaystyle 2  \ { ms }^{ -2 } and covering a distance of 10 m is _____ \displaystyle { ms }^{ -1 }.
  • \displaystyle \sqrt { 98 }
  • \displaystyle \sqrt { 40 }
  • \displaystyle \sqrt { 20 }
  • \displaystyle \sqrt { 12 }
Two bodies of different masses {m} _ {1} and {m} _ {2} are dropped from two different heights {h} _ {1} and {h} _ {2}. What is the ratio of time taken by the two to reach the ground?
  • \displaystyle \sqrt { { h }_{ 1 } } :\sqrt { { h }_{ 2 } }
  • \displaystyle \sqrt { { h }_{ 2 } } :\sqrt { { h }_{ 1 } }
  • \displaystyle {m} _ {1} {h} _ {2} : {m} _ {2} {h} _ {1}
  • \displaystyle {m} _ {1} {h} _ {1} : {m} _ {2} {h} _ {2}
When brakes are applied the velocity of a car changes from \displaystyle { 30\ ms }^{ -1 } to\ { 10\ ms }^{ -1 } in 5 s. The acceleration produced in it is ____ \displaystyle { ms }^{ -2 }.
  • 4
  • -4
  • 20
  • -20
With what speed should a bus travel so that it can cover a distance of 10 km in 5 min?
  • 60 km/hr
  • 10 km/hr
  • 12 km/hr
  • 120 km/hr
A man runs 20 \  km in 30 \ min. What is his speed?
  • 10 \ km/hr
  • 20 \ km/hr
  • 40 \ km/hr
  • 25 \ km/hr
If a ball thrown vertically up attains a maximum height of 80\ m, its initial speed is \displaystyle ( g = { 10\ ms }^{ -2 } ).
  • \displaystyle { 40\ ms }^{ -1 }
  • \displaystyle { 20\ ms }^{ -1 }
  • \displaystyle { 50\ ms }^{ -1 }
  • \displaystyle { 10\ ms }^{ -1 }
The velocity of a retarding body changes from \displaystyle { 90\ ms }^{ -1 } to 36\ ms^{ -1 } in 9 seconds. Find the retardation of a body?
  • \displaystyle { 20\ ms }^{ -2 }
  • \displaystyle { 6\ ms }^{ -2 }
  • \displaystyle { 18\ ms }^{ -2 }
  • \displaystyle { 36\ ms }^{ -2 }
Which of the following formulae is correct?
  • Speed=Distance\times time
  • Speed=\frac { Time }{ Distance }
  • Speed=\frac { 1 }{ Distance\times time }
  • Speed=\frac { distance }{ time }
A car is travelling at a certain speed. Its final velocity reaches 40 m/s in 10 seconds accelerating at the rate of 2.5 m/s\displaystyle ^{2}. Find the initial velocity of the car.
  • 20 m/s
  • 0 m/s
  • 15 m/s
  • 10 m/s
A car is travelling at 30 m/s. If its velocity increases to 50 m/s while accelerating at the rate of 2.5 m/s\displaystyle ^{2} find the time taken to reach that velocity.
  • 10 s
  • 8 s
  • 4 s
  • 5 s
Calculate the distance travelled by a man walking at a speed of 5 km/hr in 36 minutes.
  • 3 km
  • 4 km
  • 5 km
  • 6 km
When a satellite completes one revolution around the earth its displacement will be zero. True or false
  • True
  • False
The quantity which tells the distance an object travels in a certain time is called -
  • acceleration
  • speed
  • velocity
  • none of these
A stone dropped from the top of a tower reaches the ground with a velocity of 58.8 m/s in 6 seconds. Calculate the value of acceleration due to gravity.

  • 10 m/s\displaystyle ^{2}
  • 19.6 m/s\displaystyle ^{2}
  • 8.2 m/s\displaystyle ^{2}
  • 9.8 m/s\displaystyle ^{2}
A runner running along a circular track at a constant speed has _______ velocity.
  • Variable
  • Uniform 
  • Potential
  • Parallel
If two bodies are moving with the same speed but in different directions they will have -
  • same velocities
  • same acceleration
  • different velocities
  • none of these
A boy cycles a distance of 640 m in 2 minutes and 40 seconds. What is the speed of the cycle?
  • 4 m/s
  • 8 m/s
  • 12 m/s
  • 16 m/s
Can a moving object cover zero distance?
  • Always
  • Sometimes
  • Never
  • Can't be said from given condition
The velocity of a bullet is reduced from 200\;\text{m/s} to 100\;\text{m/s} while travelling through a wooden block of thickness 10\;\text{cm}. Assuming it to be uniform, the retardation will be:
  • 15\times10^4\;\text{m/s}^2
  • 10\times10^4\;\text{m/s}^2
  • 12\times10^4\;\text{m/s}^2
  • 14.5\;\text{m/s}^2
The rate of change of velocity is called speed. True or false.
  • True
  • False
Can, a body in motion, have zero displacement?
  • Yes, always
  • Yes, provided its initial and final positions are same
  • Never
  • Yes, only if its initial and final positions are not same
A ball thrown vertically upwards with a velocity of 15 m/s reaches its highest point at 11.25 m in 1.5 sec. Find the total distance travelled by the ball and its position after 2 sec respectively. Take g=10 \ m/s^2
  • Total distance = 12 m, After 2 sec = 9.5 m.
  • Total distance = 17.5 m, After 2 sec =7.5 m.
  • Total distance = 14 m, After 2 sec = 9 m.
  • Total distance = 12.50 m, After 2 sec = 10 m.
Speed can be positive, zero or negative. True or false
  • True
  • False
Velocity is the distance travelled by a moving body per unit time. True or false.
  • True
  • False
When brakes are applied to a bus, the retardation produced is  25 cm{s}^{-2} and the bus takes 20s to stop. Calculate the initial velocity of the bus.
  • 5 m{s}^{-1}
  • 10 m{s}^{-1}
  • 15 m{s}^{-1}
  • 20 m{s}^{-1}
A body, initially at rest, starts moving with a constant acceleration 2 m{s}^{-2}. Calculate the distance travelled in 5 s.
  • 10m
  • 15m
  • 25m
  • 50m
A car was moving at 1 m{s}^{-1} when brakes were applied. The brakes offered a retardation of 0.5 m{s}^{-2}. If the brakes are applied for 2 s, after 2 s
  • the car moves at a reduced speed of 0.5 m{s}^{-1}
  • the car moves at a reduced speed of 0.25 m{s}^{-1}
  • the car stops
  • the car moves with an increased speed of 2 m{s}^{-1}
Find the distance which the car travels before the brakes are applied.
  • 75m
  • 100m
  • 120m
  • 125m
Find the acceleration of the vehicle.
  • 0.1\ A m{s}^{-2}
  • 0.3\ m{s}^{-2}
  • 0.5\ m{s}^{-2}
  • 1\ m{s}^{-2}
A train is moving with a velocity of 90\ kmph. When brakes are applied, the retardation produced is 0.5\ m{s}^{-2}. Find the velocity after 10 s.
  • 20 m{s}^{-1}
  • 25 m{s}^{-1}
  • 30 m{s}^{-1}
  • 40 m{s}^{-1}
A train is moving with a velocity of 90\  kmph. When brakes are applied, the retardation produced is 0.5 m{s}^{-2}. Find the time taken by the train to come to rest.
  • 20s
  • 30s
  • 40s
  • 50s
A car travelling at 2 m{s}^{-1} undergoes an acceleration of 1 m{s}^{-2}. How long will it take to double its velocity?
  • 1s
  • 2s
  • 3s
  • 4s
A car moving at 2.5 m{s}^{-1} doubles its velocity with an acceleration of 0.5 m{s}^{-2} in some time. If the same car travels at 1.5 m{s}^{-1}, what will be its final velocity if same acceleration acts on it for same time?
  • 2 m{s}^{-1}
  • 3 m{s}^{-1}
  • 4 m{s}^{-1}
  • 5 m{s}^{-1}
Distance is
  • the shortest path between the initial and final positions
  • the longest possible path between the initial and final positions
  • the actual path travelled by the body between the initial and final positions
  • none of these
When a body moves in an uniform circular motion, changes in velocity and speed will be
  • velocity changes but speed remains constant
  • velocity remains constant but speed changes
  • both remains constant
  • both changes
The odometer of a car reads 57321.0 km when the clock shows the time 08:30 AM. What is the distance moved by the car, if at 08:50 AM, the odometer reading has changed to 57336.0 km?
  • 75\ km
  • 50\ km
  • 15\ km
  • 10\ km
Find the total distance travelled.
  • 460 \ m
  • 4600 \ m
  • 46 \ km
  • 460 \ km
A ball is initially moving with a velocity 0.5 m{s}^{-1}. Its velocity decreases at a rate of 0.05 m{s}^{-2}. How much time will it take to stop?
  • 5s
  • 10s
  • 15s
  • 20s
A particle starts to move in a straight line from a point with velocity 10 m{s}^{-1} and acceleration - 2.0 m{s}^{-2}. Find the position of the particle at t = 5 s
  • 25m
  • -25m
  • 50m
  • -50m
Larger the slope of a displacement-time graph
  • lesser the velocity
  • higher the velocity
  • lesser the acceleration
  • higher the acceleration
The slope of displacement-time graph being negative implies
  • that the object moves towards the reference point
  • that the object moves away from the reference point
  • that the object is stationary
  • none of these
Velocity, being a vector quantity, positive velocity means
  • that the body is moving away from the reference point
  • that the body is moving towards the reference point
  • that the body is stationary
  • nothing specifically
A bullet emerge from a barrel of length 1.2 m with a speed of \displaystyle 640{ ms }^{ -1 }. Assuming constant acceleration, the approximate time that it spends in the barrel after the gun is fired is
  • 4 ms
  • 40 ms
  • 400 \displaystyle \mu s
  • 1 s
If a displacement-time graph of an object is a straight line parallel to the time axis, the object is
  • stationary
  • moving away from the reference point
  • moving towards the reference point
  • moving with an infinite velocity
A vehicle moving with a constant acceleration from A to B in a straight line AB, has velocities u and v at A and B respectively. C is the mid point of AB. If time taken to travel from A to C is twice the time to travel from C to B then the velocity of the vehicle v at B is:
  • 5u
  • 6u
  • 7u
  • 8u
A car accelerates uniformly so that it goes from a velocity of 20 {m}/{s} to a velocity of 40 {m}/{s} in 5 seconds. Find out the acceleration of a car?
  • 0.2 {m}/{{s}^{2}}
  • 4 {m}/{{s}^{2}}
  • 5 {m}/{{s}^{2}}
  • 10 {m}/{{s}^{2}}
  • 80 {m}/{{s}^{2}}
A stone dropped from the top of the tower reaches ground in 4\ sec. Height of the tower is (g = 10m/s^{2})
  • 20m
  • 40m
  • 60m
  • 80m
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