Forces and Pressure One Mark Questions

8th Standard EM

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Science

Time : 00:45:00 Hrs
Total Marks : 20
    5 x 1 = 5
  1. Which of the following liquids has more viscosity?

    (a)

    Grease

    (b)

    Water

    (c)

    Coconut oil

    (d)

    Ghee

  2. The unit of viscosity is

    (a)

    N m2

    (b)

    poise

    (c)

    kg m s–1

    (d)

    no unit

  3. Even if we tilt the barometric tube at various angles, the level of mercury will______

    (a)

    Not vary

    (b)

    increases

    (c)

    decreases

    (d)

    charge

  4. Rain drops are spherical in nature because of _________

    (a)

    Frictional force

    (b)

    Buoyant force

    (c)

    Surface tension

    (d)

    Viscous force

  5. The unit for surface tension is _________

    (a)

    Nm

    (b)

    N-1m

    (c)

    N-1m-1

    (d)

    Nm-1

  6. 5 x 1 = 5
  7. The property of _____ of a liquid surface enables the water droplets to move upward in plants.

    ()

    surface tension

  8. A simple barometer was first constructed by _____.

    ()

    Torricelli

  9. Liquids and gases together are called as___________

    ()

    Fluids

  10. Force is a _____ quantity

    ()

    Vector

  11. _________decides whether an object will sink or float

    ()

    Upward force

  12. 5 x 1 = 5
  13. Force acting on a given area is called pressure.

    (a) True
    (b) False
  14. A moving body comes to rest due to friction alone.

    (a) True
    (b) False
  15. Viscosity depends on the pressure of a liquid.

    (a) True
    (b) False
  16. Frictional force acts always along direction of the moving body

    (a) True
    (b) False
  17. Friction is called as necessary evil

    (a) True
    (b) False
  18. 5 x 1 = 5
  19. Static friction

  20. (1)

    objects are sliding

  21. Kinetic friction

  22. (2)

    Kg ms-2

  23. Rolling friction

  24. (3)

    objects are at rest

  25. Force

  26. (4)

    Nm-2

  27. Pressure

  28. (5)

    objects are in motion

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