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Class 9

Explore popular questions from Motion for Class 9. This collection covers Motion previous year Class 9 questions hand picked by experienced teachers.

Motion

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Q 1. The basic unit of time is

A

an hour

B

a minute

a second

D

None of these

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Q 2. If the speed of an object moving along a straight line keeps changing, its motion is said to be

A

uniform

non-uniform

C

circular

D

None of these

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Q 3. Which of the following relations is correct? distance

speed= {tex}\frac{\mathrm{distance}} {\mathrm{time}}{/tex}

B

speed = distance x time time time

C

speed= {tex}\frac {\mathrm{time}}{\mathrm{distance}}{/tex}

D

None of these

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Q 4. The symbol of kilometre is

A

kilo

km

C

kilo m

D

None of these

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Q 5. The symbols of all units are written in

A

plural

singular

C

both singular and plural

D

None of these

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Q 6. A speedometre records the speed directly in

A

m/s

B

km/s

km/h

D

m/min

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Q 7. A device that measures the distance by the vehicle is known as

A

a speedometre

an odometer

C

a barometer

D

None of these

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Q 8. Fig shows the distance-time graph for the motion of two vehicles A and B Which one of them is moving faster?

A

B

B

C

Both A and B are moving with same speed

D

None of these

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Q 9. Which of the following distance-time graphs shows a truck moving with speed which is not constant?

A

B

D

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Q 10. Motion of a pendulum is

A

Along a straight line

B

circular

periodic

D

None of these

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Q 11. Figures show the displacement time graph of a particle moving on the x - axis. Then match the correct order : -

A

1 - A, 2 - B, 3 - C

1 - B, 2 - C, 3 - A

C

1 - C, 2 - B, 3 - A

D

None of these

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Q 12. The position time (x- t) graph for two children A and B returning froms their school O to their homes P and Q respectively are shown in fig. choose the correct entries in the brackets below :

A

(B) lives closer to the school than (A).

B

(B) starts from the school earlier than (A).

C

(A) walks faster than (B).

(A/B) overtakes (B/A) on the road (once/twice)

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Q 13. A particle has a velocity is towards east at t = o. Its accderation is towards west and is constant. Let xA and xB be the magnitude of displacments in the first 10 seconds and the next 10 seconds.

A

xA < xB

B

xA = xB

C

xA > xB

the information is in sufficient to decide the relation of xA with xB.

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Q 14. A person travelling on a straight line moves with a uniform velocity {tex}v_1{/tex} for some time and with uniform velocity {tex}v_2{/tex} for the next equal time. The average velocity {tex}v{/tex} is given by : -

{tex}v=\frac{v_1+v_2}{2}{/tex}

B

{tex}v=\sqrt{v_1v_2}{/tex}

C

{tex}\frac{2}{v}=\frac{1}{v_1}+\frac{1}{v_2}{/tex}

D

{tex}\frac{1}{v}=\frac{1}{v_1}+\frac{1}{v_2}{/tex}

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Q 15. A person travelling on a strainght line moves with a uniform velocity {tex}v_1{/tex} for some time and with uniform velocity {tex}v_2{/tex} for the next equal time. The average velocity {tex}v{/tex} is given by : -

A

{tex}v=\frac{v_1+v_2}{2}{/tex}

B

{tex}v=\sqrt{v_1v_2}{/tex}

{tex}\frac{2}{v}=\frac{1}{v_1}+\frac{1}{v_2}{/tex}

D

{tex}\frac{1}{v}=\frac{1}{v_1}+\frac{1}{v_2}{/tex}

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Q 16. A stone is released from an elevator going up with an acceleration a. The acceleration of the stone after the release is:

A

a upward

B

(g - a) upward

C

(g - a) downward

g downward

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Q 17. A person standing near the edge of the top of a building throws two balls A and B. The ball A is throwns vertically upward and B is thrown vertically downward with the same speed The ball A hits the ground with a speed vA and the ball B hits the ground with a speed vB we have : -

A

VA > VB

B

VA < VB

VA = VB

D

the relation between VA and VB depends on height of the building above the ground

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Q 18. The acceleration of a car started at t = o, varies with times as shown in figure. the distance travelled in 15 seconds is : -

100 m

B

25 m

C

150 m

D

0 m

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Q 19. A player throws a ball upwards with an initial speed of 29.4 m s-1. The time taken by the ball to return to the player's hands is. (Take g = 9.8 m s-2 and neglect air resistance).

A

10 sec

B

8 sec

C

12 sec

6 sec

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Q 20. A man walks on a straight road from his home to a market 2.5 km away with a speed of 5 km h-1. Finding the market closed, he instantly turns and walks back home with a speed of 7.5 km h-1. the average speed of the man over the interval of time 0 to 40 min.

A

5 km h-1

B

7.5 km h-1

5.625 km h-1

D

None of these

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Q 21. What is the speed with which a stone leaves a string, if it is let go when the length of the string holding the stone is 0.7 m and is revolving at 3 rev/s?

A

15.6 m/s

B

10.2 m/s

13.2 m/s

D

none of these

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Q 22. Ratio of displacment to distance is:

A

always < 1

B

always = 1

C

always > 1

always= or < 1

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Q 23. {tex}\mathrm{Assertion : }{/tex} A body can have acceleration even if its velocity is zero at a given instant of time
{tex}\mathrm{Reason : }{/tex}A body is momentarily at rest when it reverses its direction of motion.

Both Assertion and Reason are true and Reason is the correct explanation of 'Assertion'

B

Both Assertion and Reason are true and Reason is not the correct explanation of 'Assertion'

C

Assertion is true but Reason is false

D

Assertion is false but Reason is true

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Q 24. {tex}\mathrm{Assertion : }{/tex} The velocity of a particle may vary even when its speed is constant.
{tex}\mathrm{Reason : }{/tex} Such a body may move along a circular path

A

Both Assertion and Reason are true and Reason is the correct explanation of 'Assertion'

Both Assertion and Reason are true and Reason is not the correct explanation of 'Assertion'

C

Assertion is true but Reason is false

D

Assertion is false but Reason is true

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Q 25. {tex}\mathrm{Assertion : }{/tex} The x-t graph for a body at rest is a straight line parallel to time axis.
{tex}\mathrm{Reason : }{/tex} A body at rest does not change its position with the lapse of time.

Both Assertion and Reason are true and Reason is the correct explanation of 'Assertion'

B

Both Assertion and Reason are true and Reason is not the correct explanation of 'Assertion'

C

Assertion is true but Reason is false

D

Assertion is false but Reason is true