Alpha particles are MCQ with Answer and Explanation

Alpha particles are

A. Protons

B. Helium nuclei

C. Electromagnetic waves

D. Electrons

Answer: Option B

Solution (By JKExamLibrary)

Alpha particles are helium nuclei (2 protons, 2 neutrons), charge +2e, mass 4 u. Beta particles are fast electrons (or positrons). Gamma rays are high-energy photons, no mass, no charge.

This question belongs to: Science Physics

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Practice More Physics Questions

Question #1 Report Error

The power of a lens is +2 D. Its focal length is

A. 20 cm

B. 2 m

C. 50 cm

D. 0.5 m

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Correct Answer: Option D

Explanation:
Power P = 1/f (in metre). f = 1/P = 1/2 = 0.5 m = 50 cm. Positive power indicates convex lens. For concave lens, power negative. Dioptre (D) is SI unit of power. Remember f in metres.

This question belongs to: Science Physics

Question #2 Report Error

Which of the following is used as a moderator in nuclear reactor?

A. Uranium

B. Cadmium

C. Graphite

D. Boron

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Correct Answer: Option C

Explanation:
Graphite, heavy water (D₂O), beryllium are moderators. Cadmium and boron are control rods (absorb neutrons). Uranium is fuel. Moderator slows neutrons.

This question belongs to: Science Physics