Easy MCQ +4 / -1 PYQ · JEE Mains 2023

Every planet revolves around the sun in an elliptical orbit :-

A. The force acting on a planet is inversely proportional to square of distance from sun.

B. Force acting on planet is inversely proportional to product of the masses of the planet and the sun.

C. The Centripetal force acting on the planet is directed away from the sun.

D. The square of time period of revolution of planet around sun is directly proportional to cube of semi-major axis of elliptical orbit.

Choose the correct answer from the options given below :

  1. A C and D only
  2. B B and C only
  3. C A and D only Correct answer
  4. D A and C only

Solution

<p>A. The force acting on a planet is inversely proportional to the square of the distance from the sun. This is known as the inverse square law and is described by Newton's law of gravitation.</p> <p>B. Force acting on a planet is inversely proportional to the product of the masses of the planet and the sun. This is also described by Newton's law of gravitation, but it is not directly related to the planet's elliptical orbit.</p> <p> C. The centripetal force acting on the planet is directed towards the sun, not away from it.</p> <p>D. The square of the time period of revolution of a planet around the sun is directly proportional to the cube of the semi-major axis of the elliptical orbit. This is known as Kepler's third law.</p> Therefore, only A and D are correct.

About this question

Subject: Physics · Chapter: Gravitation · Topic: Kepler's Laws

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