NCERT Class-9 Science Solutions: Chapter 10-Gravitation Part 2

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Question 8:

The value of quantity in the law of gravitation

  1. Depends on mass of earth only

  2. Depends on radius of earth only

  3. Depends on both mass and radius of earth

  4. Is independent of mass and radius of the earth

Answer: D

Image the universal law of gravitation

Image the Universal Law of Gravitation

Image the universal law of gravitation

Question 9:

Two particles are placed at some distance. If the mass of each of the two particles is doubled, keeping the distance between them unchanged, the value of gravitational force between them will be

Answer: B

Image the force between two object

Image the Force between Two Object

Image the force between two object

Question 10:

The atmosphere is held to the earth by

  1. Gravity

  2. Wind

  3. Clouds

  4. Earth’s magnetic field

Answer: A

Image atmospheric held to the earh by gravity

Image Atmospheric Held to the Earh by Gravity

Image atmospheric held to the earh by gravity

Question 11:

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

  1. Gravitational potential

  2. Acceleration due to gravity

  3. Gravitational field

  4. Universal gravitational constant

Answer: D

Figure shown the gravitational force

Figure Shown the Gravitational Force

Figure shown the gravitational force

Question 12:

The weight of an object at the center of the earth of radius R is

  1. Zero

  2. Infinite

  3. times the weight at the surface of the earth

  4. times the weight at surface of the earth

Answer: A

Image center of the earth of radius R is zero

Image Center of the Earth of Radius R is Zero

Image center of the earth of radius R is zero

Question 13:

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

Answer: A

Image object weighs 10 N in air and 8 N in water

Image Object Weighs 10 N in Air and 8 N in Water

Image object weighs 10 N in air and 8 N in water

Question 14:

A girl stands on a box having in three ways. In which of the following cases, pressure exerted by the brick will be

  1. Maximum when length and breadth form the base

  2. Maximum when breadth and width form the base

  3. Maximum when width and length form the base

  4. The same in all the above three cases

Answer: B

Image when width and length form the base

Image when Width and Length Form the Base

Image when width and length form the base