Gravitation Question Paper Class 11 Physics CBSE Board Exam

Chapter: Gravitation – Question Paper

CBSE Class 11 Physics

Max Marks: 35
Time: 1 Hour

Section A – Multiple Choice Questions (MCQs) [1 × 5 = 5]

1. The force of gravitation between two masses is F. If the mass of one object is doubled and the distance between them is halved, the new force will be:
   (a) 2F
   (b) 4F
   (c) 8F
   (d) 16F
2. The weight of an object at the center of the Earth is:
   (a) Zero
   (b) Infinite
   (c) Same as on the surface
   (d) None of these
3. The orbital velocity of a satellite increases when:
   (a) The mass of the satellite increases
   (b) The radius of the orbit decreases
   (c) The gravitational constant increases
   (d) The satellite moves away from the Earth
4. The escape velocity of a body from Earth depends on:
   (a) The mass of the body
   (b) The mass of the Earth and its radius
   (c) Only on the mass of the Earth
   (d) None of these
5. The time period of a satellite orbiting close to Earth is approximately:
   (a) 24 hours
   (b) 90 minutes
   (c) 365 days
   (d) 12 hours

Section B – Short Answer Questions (SA-I) [2 × 4 = 8]

6. Explain Kepler’s first law of planetary motion with a diagram.
7. Define gravitational potential energy and derive its expression for two masses separated by a distance r.
8. Why does the Moon not fall towards the Earth even though it is under Earth’s gravitational influence?
9. The mass of the Moon is 1/81 of Earth’s mass, and its radius is 1/4 of Earth’s radius. Find the acceleration due to gravity on the Moon.

Section C – Short Answer Questions (SA-II) [3 × 3 = 9]

10. Derive an expression for the variation of acceleration due to gravity with altitude.
11. A satellite revolves around the Earth at a height of 500 km. Calculate its orbital velocity. (Given: Radius of Earth = 6400 km, Gravitational constant G=6.67×10−11G = 6.67 \times 10^{-11}G=6.67×10−11 Nm²/kg², Mass of Earth M=5.972×1024M = 5.972 \times 10^{24}M=5.972×1024 kg)
12. The gravitational force between two objects separated by 1 m is 10 N. What will be the force if the distance between them becomes 4 m?

Section D – Long Answer Questions (LA) [5 × 2 = 10]

13. Derive an expression for escape velocity of a body from a planet’s surface and explain its significance.
14. Explain the concept of geostationary and polar satellites. Discuss their uses and differences with suitable examples.

Instructions:

• Answer all questions in a stepwise manner.
• Show proper derivations and calculations where required.
• Use SI units in numerical problems.

This paper includes theory, derivations, and numerical problems to prepare students thoroughly for CBSE Class 11 Physics exams