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CBSE Class 9  >  Class 9 Notes  >  Science   >  Unit Test: Gravitation

Unit Test: Gravitation

Time: 1 hour 
M.M. 30 
Attempt all questions. 
Question numbers 1 to 5 carry 1 mark each. 
Question numbers 6 to 8 carry 2 marks each. 
Question numbers 9 to 11 carry 3 marks each. 
Question numbers 12 & 13 carry 5 marks each.

​Q1. What is the force that keeps the moon in its orbit around the Earth? (1 Mark)

Q2. Define centripetal force. (1 Mark)

Q3. What is the SI unit of the universal gravitational constant (G)? (1 Mark)

Q4. What is the acceleration due to gravity on Earth's surface (approximate value)? (1 Mark)

Q5. Why do objects float in a liquid? (1 Mark)

Q6. State the universal law of gravitation. (2 Marks)

Q7. Why does a sheet of paper fall slower than a crumpled ball? (2 Marks)

Q8. Define thrust and pressure. (2 Marks)

Q9.  Calculate the gravitational force between the Earth and a 1 kg object on its surface. Given: Mass of Earth = 6 × 1024 kg, Radius of Earth = 6.4 × 106 m, G = 6.7 × 10-11 N m2 kg-2. Explain why this force is significant. (3 Marks)

Q10. Describe Archimedes' principle with an example. (3 Marks)

Q11. How does the gravitational force between two objects change if:
(i) the mass of one object is doubled?
(ii) the distance between them is halved?
(iii) both masses are doubled?   (3 Marks)

Q12. Explain why the weight of an object on the moon is 1/6th its weight on Earth. (5 Marks)

Q13. A stone is dropped from a 100 m tower, and another is projected upward from the ground at 25 m/s simultaneously. Taking g = 10 m/s2, calculate when and where they meet. (5 Marks)

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FAQs on Unit Test: Gravitation

1. What is the law of gravitation and who formulated it?
Ans. The law of gravitation, known as Newton's law of universal gravitation, states that every point mass attracts every other point mass in the universe with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers. This law was formulated by Sir Isaac Newton in the late 17th century.
2. How does the distance between two objects affect the gravitational force between them?
Ans. According to the law of gravitation, the gravitational force between two objects decreases as the distance between them increases. Specifically, the force is inversely proportional to the square of the distance; if the distance between the two objects is doubled, the gravitational force becomes one-fourth as strong. This relationship emphasizes that even large masses can exert a weak gravitational pull if they are far apart.
3. What role does mass play in the gravitational force according to the law of gravitation?
Ans. Mass plays a critical role in the gravitational force as the force is directly proportional to the product of the masses of the two objects involved. This means that as the mass of either object increases, the gravitational force between them also increases. For example, if one of the masses doubles, the gravitational force will also double, provided the distance remains constant.
4. Can you explain the concept of weight and how it relates to gravity?
Ans. Weight is the force exerted by gravity on an object and is calculated as the product of the object's mass and the acceleration due to gravity (W = m × g). Gravity varies depending on location; for instance, the acceleration due to gravity is approximately 9.8 m/s² on the surface of the Earth. Therefore, an object's weight changes if it is on a different planet or at a different altitude due to variations in gravitational force.
5. What are some practical applications of the law of gravitation in everyday life?
Ans. The law of gravitation has several practical applications, including satellite technology, where satellites are placed in orbit around Earth due to gravitational attraction. It also plays a role in understanding tides, as the gravitational pull of the Moon and the Sun affects ocean levels. Additionally, it is essential in fields such as astronomy for calculating the orbits of planets and understanding the structure of galaxies.
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Apr 14, 2026 Last updated
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Document Description: Unit Test: Gravitation for Class 9 2026 is part of Science Class 9 preparation. The notes and questions for Unit Test: Gravitation have been prepared according to the Class 9 exam syllabus. Information about Unit Test: Gravitation covers topics like and Unit Test: Gravitation Example, for Class 9 2026 Exam. Find important definitions, questions, notes, meanings, examples, exercises and tests below for Unit Test: Gravitation.
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