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Important Questions

Gravitation : Planets and Satellites

ICSE · Class 11 · Physics

Most important questions from Gravitation : Planets and Satellites for ICSE Class 11 Physics board exam 2026. MCQs, short answer, and long answer questions with marks.

72 questions42 flashcards5 concepts

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An illustration showing a planet orbiting the Sun in an elliptical path, with the Sun located at one of the foci of the ellipse. Labels indicate the Sun, the planet, and the elliptical orbit.
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72 Questions·
multiple choicemultiple correct

Sample Questions

1multiple choice
3 marks

A geostationary satellite has orbital radius 42200 km and period 24 h. Find its orbital speed.

Show answer

3.1 km/s

Use v = 2πr/T. With r = 42200 km and T = 24 h, v ≈ 2 × 3.14 × 42200 / 24 ≈ 11042 km/h = 3.1 km/s.

2multiple choice
3 marks

At Earth’s surface, g = 9.8 m/s^2 and R_e = 6.37 × 10^6 m. Find the escape velocity using v_e = √(2gR_e).

Show answer

11.2 km/s

v_e = √(2gR_e) = √(2 × 9.8 × 6.37 × 10^6) ≈ √1.248 × 10^8 ≈ 1.12 × 10^4 m/s = 11.2 km/s.

3multiple choice
3 marks

A satellite of mass m moves in a circular orbit of radius r around Earth. If its orbital speed is v_o, find the total energy in terms of G, Me, m and r.

Show answer

-1/2 GMe m / r

For a circular orbit, K = GMe m /(2r) and U = -GMe m / r. So E = U + K = -GMe m/r + GMe m/(2r) = -1/2 GMe m/r.

4multiple choice
3 marks

A satellite orbits Earth in a circle of radius 2R_e. Find its orbital speed in terms of the orbital speed close to Earth’s surface, v_0.

Show answer

v_0/√2

Orbital speed varies as 1/√r. If r becomes 2R_e, speed becomes √(R_e/2R_e) = 1/√2 times the close-orbit speed v_0.

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Frequently Asked Questions

What are the important topics in Gravitation : Planets and Satellites for ICSE Class 11 Physics?
Gravitation : Planets and Satellites covers several key topics that are frequently asked in ICSE Class 11 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Gravitation : Planets and Satellites — ICSE Class 11 Physics?
Understand the core concepts first, then work through the 72 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.
How many important questions are there in Gravitation : Planets and Satellites?
There are 72 practice questions available for Gravitation : Planets and Satellites. These cover multiple question types including MCQs, short answer, and long answer questions.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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