NCERT ON GRAVITATION

Question 1 : The mass of an object is

  • a) The amount of matter contained in the object, independent of where that object is found
  • b) The force of gravity on that object located at a particular point in space
  • c) Dependent on whether the object is on the Earth or elsewhere.
  • d) Divided by the Earth acceleration due to gravity to equal force.

Answer: a. The amount of matter contained in the object, independent of where that object is found

Question 2: Which of the following was NOT a contribution of Newtons to science?

  • a) The first good experimental measure of G, the gravitational constant of proportionality
  • b) The law of universal gravitation
  • c) F = ma
  • d) Explanations of optical phenomena

Answer: a. The first good experimental measure of G, the gravitational constant of proportionality

Question 3: If the distance between objects increases, then the gravitational force between the objects will:

  • a) Decrease
  • b) None of these
  • c) Remain same
  • d) Increase

Answer:  a. Decrease

Question 4: The relation between the weight of an object on the moon (WM) and on the earth (WE)

  • a) WM =1/6 (We)
  • b) We = 1/6WM
  • c) WM= We
  • d) WM =6 WE

Answer: a. WM =1/6 (We)

Question 5: The weight of an object is:

  • a) Equal on both earth and moon
  • b) Greater on earth and lesser on moon
  • c) Lesser on earth and greater on moon
  • d) None of these

Answer: b. Greater on earth and lesser on moon

Question 6: The upward force exerted by the liquid displaced by the body when it is placed inside the liquid is called

  • a) Centripetal force
  • b) Gravitational force
  • c)Buoyant force
  • d) Force of gravitation

Answer :c. Buoyant force

Question 7: SI Unit of pressure is

  • a) Pascal
  • b) Newton
  • c) m/s
  • d) Dyne

Answer: a. Pascal

Question 8: The force acting on an object perpendicular to the surface is called

  • a) Thrust
  • b) Pressure
  • c) Weight
  • d) Weight

Answer: a. Thrust

Question 9: The expression for finding the gravitational force of attraction between any two bodies is

  • a) F = Gm1/r
  • b) F= G m1m2/r
  • c) F= G m1m2/r3
  • d) F= Gm1 m2/r2

Answer: d.  F= Gm1 m2/r2

Question 10: The force which keeps the body to move in circular motion when accelerated is

  • a) Centripetal force
  • b) Magnetic force
  • c) Force of gravitation
  • d) Electrostatic force

Answer: a. Centripetal force

Question 11: The time of ascent when measured from the point of projection of a body projected upwards , the

  • a) Time of ascent=Time of descent
  • b) Time of ascent > Time of descent
  • c) Time of ascent < Time of descent
  • d) All of the above

Answer: a. Time of ascent=Time of descent

Question 12: Weight of an object on the surface of the moon is

  • a)1/3 that on the surface of the earth
  • b) 1/5 that on the surface of the earth
  • c) 1/6 that on the surface of the earth
  • d) 1/2 that on the surface of the earth

Answer: c. 1/6 that on the surface of the earth

Question 13: The value of acceleration due to gravity at the poles

  • a) Is more than at the equator
  • b) Same as at the equator
  • c) Is less than at the equator
  • d) Zero

Answer: a. Is more than at the equator

Question 14: The value of acceleration due to gravity at the highest point of the motion of the body when a body is projected upwards

  • a) 9.8 m/s2 upwards
  • b) 0 m/s2
  • c) 6 m/s2
  • d)9.8 m/s2 downwards

Answer: d. 9.8 m/s2 downwards

Question 15: The value of acceleration due to gravity of the surface of the earth is

  • a) 9.8 m/s2
  • b) 6 m/s2
  • c) 8 m/s2
  • d) 4.9 m/s2

Answer: a. 9.8 m/s2

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