Quiz  /  Gravitation Class 9 MCQ Questions With Answers

  • 1. 
    The masses of two planets are in the ratio 1 : 2. Their radii are in the ratio 1 : 2. The acceleration due to gravity on the planets are in the ratio

  • 1:2
  • 2:1
  • 1:4
  • 4:1

  • 2. 
    The acceleration due to gravity on the Earth depends upon the

  • radius of the Earth
  • mass of the Earth
  • shape and size of the body
  • Both A & B

  • 3. 
    The gravitational force between two objects is F. If masses of both objects are halved without changing the distance between them, then the gravitational force would become

  • F/8
  • F/4
  • F/2
  • 4F

  • 4. 
    In the relation F = GM m/d2, the quantity G

  • depends on the value of G at the place of observation
  • is used only when the Earth is one of the two masses
  • is greatest at the surface of the Earth
  • is universal constant of nature

  • 5. 
    The atmosphere is held to the Earth by

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

  • 6. 
    Law of gravitation gives the gravitational force between

  • the Earth and a point mass only
  • the Earth and Sun only
  • any two bodies having some mass
  • two charged bodies only

  • 7. 
    The weight of any person on the moon is about 1/6 times that on the earth. He can lift a mass of 12 kg on the earth. What will be the maximum mass, which can be lifted by the same force applied by the person on the moon?

  • 60KG
  • 72KG
  • 54KG
  • 96KG

  • 8. 
    A stone is released from the top of a tower of height 19.6 m. Then its final velocity just before touching the ground will be:

  • 384.16 m/ s
  • 196 m/s
  • 19.6 m/s
  • 3841.4 m/s

  • 9. 
    The gravitational force between two massive spheres

  • is always an attraction.
  • depends on how massive they are.
  • depends inversely on the square of the distances betwn them.
  • all of the above

  • 10. 
    If the mass of Earth increased, with no change in radius, your weight would _____.

  • increase also
  • stay the same
  • decrease
  • None of these

  • 11. 
    Acceleration due to gravity on the surface of a planet is g/5 where g is the value on the earth. When a body is vertically thrown up on the earth, it reaches a maximum height h. If the same body is projected with the same velocity from the surface of planet, maximum height reached by it would be

  • h/5
  • h/25
  • 5h
  • 25h

  • 12. 
    The value of acceleration due to gravity

  • decreases from pole to equator
  • is least on equator
  • is least on equator
  • Both A & B

  • 13. 
    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

  • 14. 
    The mass of moon is about 0.012 times that of the earth and its diameter is about 0.25 times that of earth. The value of G on the moon will be:

  • Same as that on the earth
  • About one-fifth of that on the earth
  • About one-sixth of that on the earth
  • About one-fourth of that on the earth

  • 15. 
    If the gravitational attraction of the Earth suddenly disappears, which of the following statements will be true?

  • The weight of body will become zero but the mass will remain same.
  • The weight of a body will remain same but the mass will become zero.
  • Both mass and weight become zero.
  • Neither mass nor weight becomes zero.

  • 16. 
    Suppose Fg between two massive spheres = 90 N. If distance between spheres is tripled, new Fg=

  • 270 N
  • 10 N
  • 810 N
  • 30 N

  • 17. 
    The weight of an object at the centre of the Earth of radius R is

  • zero
  • infinite
  • R times the weight at the surface of the Earth
  • 1/R2 times the weight at surface of the Earth

  • 18. 
    The value of quantity G in the law of gravitation

  • depends on mass of Earth only
  • depends on radius of Earth only
  • depends on both mass and radius of Earth
  • is independent of mass and radius of the Earth

  • 19. 
    A 1000-kg car rests on the Earth. The magnitude of Fg of the Earth on the car is:

  • 6.67 x10-11 N
  • 9.8 N
  • 9800 N
  • 1000 N

  • 20. 
    An apple falls from a tree because of gravitational attractionbetween the Earth and the apple. If F1 is the magnitude of force exerted by the Earth on the apple and F2 is the magnitude of force exerted by the apple on the Earth, then

  • F1 is very much greater than F2
  • F2 is very much greater than F1
  • F1 is only a little greater than F2
  • F1 and F1 are equal

  • 21. 
    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.

  • 22. 
    In the last question, what is the magnitude of the gravitational force of the car on the Earth?

  • less than the force of the Earth on the car
  • equal to the force of the Earth on the car
  • greater than the force of the Earth on the car
  • None of these

  • 23. 
    Two objects of different masses falling freely near the surface of the moon would

  • have same velocities at any instant
  • have different acceleration
  • experience forces of same magnitude
  • undergo a change in their inertia

  • 24. 
    Two objects move toward each other gravitationally. As they get closer, the force between them:

  • remains constant
  • increases
  • decreases
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