Gravitation Quiz - CBSE Class 9 Science

Free practice quiz: Gravitation (CBSE Class 9 Science). 20 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This CBSE Class 9 Science practice quiz has 20 multiple-choice questions on Gravitation, and 20 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. Which of the following best defines gravitation?

   1. A force that pulls objects away from each other
   2. A force that attracts objects towards each other
   3. A force that keeps objects stationary
   4. A force that only acts between planets
   Show answer

   Answer: B. A force that attracts objects towards each other

   Gravitation is the force by which a planet or other body draws objects toward its center. It is a force of attraction.

2. How does mass affect gravitational force?

   1. Gravitational force decreases with increased mass
   2. Gravitational force is independent of mass
   3. Gravitational force increases with increased mass
   4. Gravitational force is constant regardless of mass
   Show answer

   Answer: C. Gravitational force increases with increased mass

   According to Newton's law of universal gravitation, gravitational force increases with the increase in mass.

3. What does the gravitational constant (G) represent?

   1. It measures the force between two bodies that are a distance apart
   2. It is the acceleration due to gravity on Earth
   3. It is the ratio of gravitational force to distance
   4. It gives the gravitational force between two 1 kg masses 1 meter apart
   Show answer

   Answer: D. It gives the gravitational force between two 1 kg masses 1 meter apart

   The gravitational constant G is used to quantify the strength of gravity in Newton's law and gives the force of 6.674×10⁻¹¹ Newtons between two 1 kg masses 1 meter apart.

4. Calculate the gravitational force between two 1 kg masses placed 1 meter apart from each other.

   1. 0 N
   2. 6.674 × 10⁻¹¹ N
   3. 9.8 N
   4. 1 N
   Show answer

   Answer: B. 6.674 × 10⁻¹¹ N

   Using Newton's law of gravitation, F = G(m₁m₂/r²), where G = 6.674 × 10⁻¹¹ N(m²/kg²) for 1 kg masses 1 meter apart.

5. A satellite orbits Earth in a perfect circular orbit with constant speed. What remains constant for the satellite?

   1. Its velocity
   2. Its kinetic energy
   3. Its linear momentum
   4. Its height above the Earth
   Show answer

   Answer: D. Its height above the Earth

   In a perfect circular orbit, while speed may be constant, velocity changes direction. Kinetic energy and momentum can change due to work by external forces. Height remains constant.

More questions in this quiz

Answers and explanations are in the full quiz.

1. What is the acceleration due to gravity on Earth?
2. Which scientist formulated the law of universal gravitation?
3. What is the SI unit of gravitational force?
4. The gravitational potential energy is maximum for an object located at?
5. If Earth's mass were to double while the radius remained the same, what would happen to the gravitational force experienced by an object on its surface?
6. Which relationship depicts the dependency of gravitational force on distance?
7. An astronaut weighs less on the moon than on Earth because:
8. What changes in the gravitational force experienced by two objects if their masses are halved?
9. If the distance between two objects is tripled, how does the gravitational force between them change?
10. What happens to an object's weight if it is taken from the Earth to the same altitude on a planet with twice the radius and mass of Earth?
11. Which of the following would have the least effect on the gravitational force between two objects?
12. If two objects of mass M each are separated by a distance d, what is their gravitational attraction force?
13. The value of g at the poles differs from the value at the equator. This phenomenon is attributed to:
14. An astronaut on a space walk is slightly off the space shuttle's center. If the shuttle is spinning, what force will the astronaut primarily experience?
15. In terms of gravitational forces, which system could be considered largely unaffected by the shape of bodies?

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