NCERT Class-9 Science Solutions: Chapter 10-Gravitation Part 1

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Multiple Choice Questions

Question 1:

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

  1. Have same velocities at any instant

  2. Have different accelerations

  3. Experience forces of same magnitude

  4. Undergo a change in their inertia

Answer: A

Image Different masses falling freely near the moon

Image Different Masses Falling Freely Near the Moon

Image Different masses falling freely near the moon

Question 2:

The value of acceleration due to gravity

  1. Is same on equator and poles

  2. Is least on poles

  3. Is least on equator

  4. Increases from pole to equator

Answer: C

Acceleration due to gravity is least on equator

Acceleration Due to Gravity is Least on Equator

Acceleration due to gravity is least on equator

Question 3:

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

Answer: A

Image Gravitational force between two objects

Image Gravitational Force between Two Objects

Image Gravitational force between two objects

Question 4:

A boy is whirling a stone tied with a string in a horizontal circular path. If the string breaks, the stone

  1. Will continue to move in the circular path

  2. Will move along a straight line towards the center of the circular path

  3. Will move along a straight line tangential to the circular path

  4. Will move along a straight line perpendicular to the circular path away from the boy

Answer: C

Image Straight line tangential to the circular path

Image Straight Line Tangential to the Circular Path

Image Straight line tangential to the circular path

Question 5:

An object is put one by one in three liquids having different densities. The object floats with parts of their volumes outside the liquid surface in liquids of respectively. Which of the following statement is correct?

Answer: D

Question 6:

In the relation , the quantity G

  1. Depends on the value of at the place of observation

  2. Is used only when the earth is one of the two masses

  3. Is greatest at the surface of the earth

  4. Is universal constant of nature

Answer: D

Image relation F = G M m/d 2

Image Relation F = G M M/D 2

Image relation F = G M m/d 2

Question 7:

Law of gravitation gives the gravitational force between

  1. The earth and a point mass only

  2. The earth and Sun only

  3. Any two bodies having some mass

  4. Two charged bodies only

Answer: C

Image Gravitational force between two bodies

Image Gravitational Force between Two Bodies

Image Gravitational force between two bodies