Motion || Class 9 || Physics || MCQ || SET - 1

Instructions:
Answer the following questions:



Q1. For a body starting from rest, the displacement in 10 seconds, when it acquires 4 m/s in 2 seconds is:
        (i) 25 m              (ii) 50 m              (iii) 500 m              (iv) 100 m

Q2. The area below the v – t graph is a measure of
        (i) Acceleration (ii) Displacement (iii) Angular speed (iv) Angular acceleration

Q3. If the velocity of a body is reducing, it is said to have
        (i) Negative acceleration (ii) Retardation (iii) Positive acceleration (iv) Both (a) and (b)

Q4.If the v – t graph is a straight line inclined to the time axis, then
        (i) a = 0                              (ii) a ≠ 0          (iii) a = constant ≠ 0         (iv) a ≠ constant ≠ 0

Q5.A body starting at a point, say A, reaches, say B, ahead in a straight line and returns back to A. Then there is
        (i) positive displacement    (ii) negative displacement    (iii) zero displacement    (iv) cannot be said

Q6. A car accelerates uniformly from 18 km/h to 36 km/h in 5 minutes. The acceleration is
        (i) 5 m/s–2            (ii) 1 km/s2            (iii) 216 ms–2            (iv) 216 km/h2

Q7. A body moves in a circle of radius 5 m with a speed of 5 ms–1. Then it has
        A: an acceleration of 5 ms–2
        B: an acceleration varying with direction alone
        

 (i) Only A is correct  (ii) Only B is correct  (iii) Both A and B are correct(iv) Neither A nor B is correct.

Q8. The displacement of the body in 5 seconds from the beginning of the motion is

        (i) 12.5 m        (ii) 100 m            (iii) 87.5 m            (iv) 50 m

Q9. Suppose a boy is enjoying a ride on a merry-go round that is moving with a constant speed of 10         ms–1. It implies that the boy is
        (i) at rest                                (ii) moving with no acceleration        

        (iii) in accelerated motion    (iv) moving with uniform velocity.

Q10. The area under a v–t graph represents a physical quantity that has the unit
        (i) m2                  (ii) m            (iii) m3                    (iv) ms–1

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