Alpha particle is: MCQ with Answer and Explanation

Alpha particle is:

A. Neutron

B. Photon

C. Electron

D. Helium nucleus

Answer: Option D

Solution (By JKExamLibrary)

Alpha (α) radiation: helium nucleus (²He⁴, 2p+2n), +2 charge, low penetration. Beta: electrons; Gamma: photons; Neutron: neutral particle. Memory aid: 'Alpha = He nucleus; Beta = electron; Gamma = EM wave'. Radioactivity classification frequently tested in competitive exams to distinguish radiation types.

This question belongs to: Science Physics

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Practice More Physics Questions

Question #1 Report Error

In a nuclear reactor, control rods are made of materials that:

A. Moderate neutrons

B. Absorb neutrons

C. Emit neutrons

D. Reflect neutrons

View Answer & Solution Discuss

Correct Answer: Option B

Explanation:
Control rods (made of cadmium, boron, or hafnium) absorb neutrons to regulate the fission chain reaction rate. Inserting rods deeper reduces neutron population, slowing reaction; withdrawing them increases reaction rate. Moderators (water, graphite) slow neutrons to thermal energies for efficient fission. Memory aid: 'Control rods = neutron absorbers; Moderators = neutron slowers'. This application question tests knowledge of reactor components, common in competitive exams. Always distinguish roles: fuel (fissionable material), moderator, control rods, coolant.

This question belongs to: Science Physics