Who is credited with the discovery of the electron? MCQ with Answer and Explanation

Who is credited with the discovery of the electron?
A. James Chadwick
B. Niels Bohr
C. Ernest Rutherford
D. J. J. Thomson
Answer: Option D
Solution (By JKSSB Mock Tests)
J. J. Thomson discovered the electron in 1897 through his experiments with cathode ray tubes. He demonstrated that cathode rays were actually streams of negatively charged subatomic particles, much smaller than atoms. Rutherford is famous for discovering the nucleus (gold foil experiment), Chadwick discovered the neutron, and Bohr developed the planetary model of the atom.

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Practice More Physics Questions

Question #1
1 joule is equal to how many ergs?
A. 10⁷
B. 10⁸
C. 10⁵
D. 10⁶

Correct Answer: Option A


Explanation:
1 J = 1 kg m²/s². In CGS, 1 kg = 10³ g, 1 m = 10² cm => 1 J = (10³ g) × (10² cm)² / s² = 10⁷ g cm²/s² = 10⁷ erg. Key conversion.

This question belongs to: Science Physics
Question #2
Pressure cooker cooks food faster because
A. High pressure lowers boiling point
B. Low pressure raises boiling point
C. Temperature is low
D. High pressure raises boiling point

Correct Answer: Option D


Explanation:
Higher pressure inside increases boiling point, food cooks at higher temperature.

This question belongs to: Science Physics
Question #3
A convex lens is immersed in a liquid of same refractive index. Its focal length becomes
A. Infinite
B. Same
C. Zero
D. Half

Correct Answer: Option A


Explanation:
Relative refractive index = 1, so lens behaves like glass slab, f infinite.

This question belongs to: Science Physics