The scientist who formulated the universal law of gravitation is: MCQ with Answer and Explanation

The scientist who formulated the universal law of gravitation is:

A. Albert Einstein

B. Galileo Galilei

C. Isaac Newton

D. Johannes Kepler

Answer: Option C

Solution (By JKExamLibrary)

Isaac Newton formulated the universal law of gravitation in his Principia Mathematica (1687), stating F = Gm₁m₂/r². Galileo studied falling bodies; Kepler derived planetary motion laws; Einstein developed general relativity (gravity as spacetime curvature). Memory aid: 'Newton = gravity apple story'. This history-based question tests knowledge of key scientific contributions, frequently appearing in competitive exams. Always associate scientists with their specific discoveries to avoid confusion between classical and modern physics pioneers.

This question belongs to: Science Physics

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Practice More Physics Questions

Question #1 Report Error

What is the magnetic dipole moment of an electron revolving in a circular orbit of radius 'r' with a uniform speed 'v'?

A. evr

B. e / (vr)

C. evr / 2

D. 2evr

View Answer & Solution Discuss

Correct Answer: Option C

Explanation:
Magnetic dipole moment M = Current(I) * Area(A). Current is charge/time: I = e / T. Time period T = 2pir / v. So I = ev / (2pir). The area of the circular orbit is A = pir^2. Therefore, M = [ev / (2pir)] * [pir^2] = evr / 2. This is a standard derivation in modern physics.

This question belongs to: Science Physics

Question #2 Report Error

The instrument used to measure the humidity of air is

A. Barometer

B. Hygrometer

C. Anemometer

D. Hydrometer

View Answer & Solution Discuss

Correct Answer: Option B

Explanation:
Hygrometer measures relative humidity. Wet and dry bulb, hair hygrometer. Hydrometer measures liquid density. Anemometer wind speed. Barometer pressure.

This question belongs to: Science Physics