CBSE  /  Class 9  /  Science  /  Gravitation

  • 1. 
    The atmosphere is held to the Earth by

  • gravity
  • wind
  • clouds
  • Earth’s magnetic field

  • 2. 
    The force of attraction between two unit point masses separated by a unit distance is called

  • gravitational potential
  • acceleration due to gravity
  • gravitational field
  • universal gravitational constant

  • 3. 
    The weight of an object at the centre of the Earth of radius R is (NCERT Exemplar)

  • zero
  • infinite
  • R times the weight at the surface of the Earth
  • 1/R times the weight at surface of the Earth

  • 4. 
    An object weighs 10 N in air. When immersed fully in water, it weighs only 8 N. The weight of the liquid displaced by the object will be

  • 2 N
  • 8 N
  • 10 N
  • 12 N

  • 5. 
    A girl stands on a box having 60 cm length, 40 cm breadth and 20 cm width in three ways. In which of the following cases, pressure exerted by the box will be

  • maximum when length and breadth form the base
  • maximum when breadth and width form the base
  • maximum when width and length form the base
  • the same in all the above three cases

  • 6. 
    An apple falls from a tree because of gravitational attractionbetween the Earth and the apple. If F

  • F is very much greater than F
  • F is very much greater than F
  • F is only a little greater than F
  • F and F are equal

  • 7. 
    The acceleration due to gravity on the Earth depends upon the

  • mass of the body
  • mass of the Earth
  • shape and size of the body
  • volume of the body

  • 8. 
    When a mango falls from a mango tree then

  • only the Earth attracts the mango.
  • only the mango attracts the Earth.
  • both the mango and the Earth attract each other.
  • both the mango and the Earth repel each other.

  • 9. 
    When a ship floats in sea water

  • The weight of water displaced is greater than the weight of ship
  • The weight of water displaced is less than the weight of the ship
  • The weight of water displaced is equal to the weight of the ship
  • It displaces no water.

  • 10. 
    The SI unit of pressure is

  • Nm
  • N/m
  • N/m
  • N/m
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