According to Kepler's Third Law of Planetary Motion, the square of the time period of revolution of a planet around the Sun is directly proportional to: MCQ with Answer and Explanation

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According to Kepler's Third Law of Planetary Motion, the square of the time period of revolution of a planet around the Sun is directly proportional to:

A. The cube of the mass of the Sun

B. The cube of the semi-major axis of its elliptical orbit

C. The square of the semi-major axis of its elliptical orbit

D. The mass of the planet

Answer: Option B

Solution (By JKExamLibrary)

Kepler's Third Law (Law of Periods) states that the square of the time period (T^2) of any planet is proportional to the cube of the semi-major axis (r^3) of its orbit. Mathematically, T^2 is proportional to r^3. This law helps in calculating orbital periods or distances of planets and satellites.

This question belongs to: Science Physics

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Question #1 Report Error

A 10 kg object is lifted to 5 m and then allowed to fall. Kinetic energy just before hitting ground (g=10) is

A. 250 J

B. 500 J

C. 0 J

D. 1000 J

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Correct Answer: Option B

Explanation:
PE at top = mgh = 10×10×5 = 500 J, converted to KE = 500 J (assuming no air resistance).

This question belongs to: Science Physics

Question #2 Report Error

Which of the following particles has the largest penetrating power?

A. Beta particles

B. Alpha particles

C. Protons

D. Gamma rays

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Correct Answer: Option D

Explanation:
Gamma rays (photons) have highest penetration, stopped by thick lead/concrete. Alpha least (paper/skin). Beta intermediate (aluminium). Neutrons also penetrating but not listed. Gamma has no charge.

This question belongs to: Science Physics