MOTION

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MOTION

9TH STD

QUIZ

1. If the displacement of an object is proportional to square of time, then the object moves with:

1 point

(a) Uniform velocity

(b) Uniform acceleration

(d) Decreasing acceleration

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2. From the given v-t graph, it can be inferred that the object is

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(a) At rest

(b) In uniform motion

(d) In non-uniform motion

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3. Suppose a boy is enjoying a ride on a marry-go-round which is moving with a constant speed of 10 m/s. It implies that the boy is:

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(a) At rest

(b) Moving with no acceleration

(d) Moving with uniform velocity

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4. A particle is moving in a circular path of radius r.

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(a) Zero

(b) πr

(d) 2πr

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5. Which of the following can sometimes be ‘zero’ for a moving body?

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i. Average velocity

ii. Distance travelled

iii. Average speed

iv. Displacement

(a) Only (i)

(b) (i) and (ii)

(d) Only (iv)

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6. Which of the following statement is correct regarding velocity and speed of a moving body?

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(a) Velocity of a moving body is always higher than its speed

(b) Speed of a moving body is always higher than its velocity

(d) Velocity of a moving body is its speed in a given direction

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7. When a car driver travelling at a speed of 10 m/s applies brakes and brings the car to rest in 20 s, then the retardation will be:

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(a) + 2 m/s2

(b) − 2 m/s2

(d) + 0.5 m/s2

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8. The speed - time graph of a car is given here. Using the data in the graph calculate the total distance covered by the car.

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(a) 1250 m

(b) 875 m

(d) 870 m

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9. A car of mass 1000 kg is moving with a velocity of 10 m/s. If the velocity-time graph for this car is a horizontal line parallel to the time axis, then the velocity of the car at the end of 25 s will be:

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(a) 40 m/s

(b) 25 m/s

(d) 250 m/s

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10. Which of the following is most likely not a case of uniform circular motion?

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(a) Motion of the earth around the sun

(b) Motion of a toy train on a circular track

(d) Motion of hours’ hand on the dial of a clock

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11. A car is travelling at a speed of 90 km/h. Brakes are applied so as to produce a uniform acceleration of – 0.5 m/s2. Find how far the car will go before it is brought to rest?

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(a) 8100 m

(b) 900 m

(d) 620 m

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12. In a free fall the velocity of a stone is increasing equally ion equal intervals of time under the effect of gravitational force of the earth. Then what can you say about the motion of this stone? Whether the stone is having:

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(a) Uniform acceleration

(b) Non-uniform acceleration

(d) Constant speed

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