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.

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
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   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
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   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
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   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
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   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
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   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.

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