Motion Important Questions

9th Standard

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Science

Time : 01:00:00 Hrs
Total Marks : 50
    5 x 1 = 5
  1. Slope of the velocity - time graph gives

    (a)

    speed

    (b)

    displacement

    (c)

    distance

    (d)

    acceleration

  2. Unit of acceleration is

    (a)

    ms-1

    (b)

    ms-2

    (c)

    ms

    (d)

    ms2

  3. The force responsible for drying of clothes in a washing machine is

    (a)

    Centripetal force

    (b)

    Centrifugal force

    (c)

    Gravitational force

    (d)

    Electro static force

  4. In a 100 m race, the winner takes 10s to reach the finishing point. The average speed of the winner is ___________ ms-1

    (a)

    5

    (b)

    10

    (c)

    20

    (d)

    40

  5. Speed is never ______

    (a)

    fraction

    (b)

    negative

    (c)

    zero

    (d)

    positive

  6. 5 x 1 = 5
  7. Speed is a ____________ quantity whereas velocity is a ____________ quantity

    ()

      scalar, vector

  8. Consider an object is rest at position x = 20m. Then its displacement – time graph will be straight line to _____________ the axis.

    ()

    Parallel to

  9. Area under velocity ‒ time graph shows ____________

    ()

    distance travelled by an object

  10. The graph of uniform motion is _____

    ()

    Straight line

  11. Acceleration is a _____ quantity.

    ()

    Vector

  12. 5 x 1 = 5
  13. The motion of a city bus in a heavy traffic road is an example for uniform motion

    (a) True
    (b) False
  14. Distance covered by a particle never becomes zero between any interval of time but displacement becomes zero

    (a) True
    (b) False
  15. If the velocity – time graph of a particle is a straight line inclined to time axis then its displacement – time graph will be a straight line?

    (a) True
    (b) False
  16. For a freely falling body the acceleration 'a' is replaced by s.

    (a) True
    (b) False
  17. Giant wheel moves a vertical linear path.

    (a) True
    (b) False
  18. 5 x 1 = 5
  19. Motion of a body covering equal distances in equal interval of time

  20. (1)

  21. Constant retardation

  22. (2)

    m

  23. Uniform acceleration

  24. (3)

  25. Speed

  26. (4)

    m/s

  27. Distance

  28. (5)

    4 x 2 = 8
  29. Define distance.

  30. What is speed?

  31. What is acceleration?

  32. A student takes 15 minutes to travel from his home to school with a uniform speed of 5km/h. What is the distance of his school form the home?

  33. 4 x 3 = 12
  34. An object travels 16m in 4s and then another 16m in 2 s. What is the average speed of the object?

  35. Define velocity?

  36. Distinguish distance and displacement.

  37. What is meant by negative acceleration?

  38. 2 x 5 = 10
  39. Derive equations of motion by graphical method.

  40. A racing car has a uniform acceleration of 4 ms-2. What distance it covers in 10 s after start?

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