Motion

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Q 1. The basic unit of time is

an hour

a minute

a second

None of these

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Q 2. 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 : -

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

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

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

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

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Q 3. If the speed of an object moving along a straight line keeps changing, its motion is said to be

uniform

non-uniform

circular

None of these

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Q 4. Which of the following relations is correct? distance

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

speed = distance x time time time

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

None of these

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Q 5. The symbol of kilometre is

kilo

km

kilo m

None of these

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Q 6. The symbols of all units are written in

plural

singular

both singular and plural

None of these

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Q 7. A speedometre records the speed directly in

m/s

km/s

km/h

m/min

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Q 8. A device that measures the distance by the vehicle is known as

a speedometre

an odometer

a barometer

None of these

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Q 9. Fig shows the distance-time graph for the motion of two vehicles A and B Which one of them is moving faster?

A

B

Both A and B are moving with same speed

None of these

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Q 11. Motion of a pendulum is

Along a straight line

circular

periodic

None of these

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Q 12. Figures show the displacement time graph of a particle moving on the x - axis. Then match the correct order : -

1 - A, 2 - B, 3 - C

1 - B, 2 - C, 3 - A

1 - C, 2 - B, 3 - A

None of these

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Q 13. 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 :

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

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

(A) walks faster than (B).

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

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Q 14. 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.

x_{A} < x_{B}

x_{A} = x_{B}

x_{A} > x_{B}

the information is in sufficient to decide the relation of x_{A} with x_{B}.

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Q 15. 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}

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

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

{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 upward

(g - a) upward

(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 v_{A} and the ball B hits the ground with a speed v_{B} we have : -

V_{A} > V_{B}

V_{A} < V_{B}

V_{A} = V_{B}

the relation between V_{A} and V_{B} 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

25 m

150 m

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).

10 sec

8 sec

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.

5 km h^{-1}

7.5 km h^{-1}

5.625 km h^{-1}

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?

15.6 m/s

10.2 m/s

13.2 m/s

none of these

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Q 22. Ratio of displacment to distance is:

always < 1

always = 1

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'

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

Assertion is true but Reason is false

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

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'

Assertion is true but Reason is false

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'

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

Assertion is true but Reason is false

Assertion is false but Reason is true

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