Nuclear fission involves: MCQ with Answer and Explanation

Nuclear fission involves:

A. Combining light nuclei

B. Emission of electrons from nucleus

C. Splitting heavy nuclei

D. Capture of orbital electrons

Answer: Option C

Solution (By JKExamLibrary)

Nuclear fission is the splitting of a heavy nucleus (e.g., uranium-235, plutonium-239) into lighter nuclei, releasing energy and neutrons. This process powers nuclear reactors and atomic bombs. Fusion combines light nuclei (e.g., hydrogen to helium), powering stars. Memory aid: 'Fission = splitting heavy; Fusion = joining light'. This conceptual question tests understanding of nuclear reactions, frequently examined in competitive exams. Always link fission to chain reactions (neutrons induce further fissions) and critical mass concepts.

This question belongs to: Science Physics

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Practice More Physics Questions

Question #1 Report Error

A 100 W bulb is used for 10 hours. Energy consumed is

A. 1 kWh

B. 100 kWh

C. 0.1 kWh

D. 10 kWh

View Answer & Solution Discuss

Correct Answer: Option A

Explanation:
Energy = 0.1 kW × 10 h = 1 kWh.

This question belongs to: Science Physics

Question #2 Report Error

The process of combining two light nuclei to form a heavier nucleus is

A. Fission

B. Radioactive decay

C. Fusion

D. Chain reaction

View Answer & Solution Discuss

Correct Answer: Option C

Explanation:
Nuclear fusion: e.g., hydrogen isotopes deuterium and tritium fuse to helium, releasing energy. Powers Sun and stars. Requires high temperature (thermonuclear). Fusion reactor under development.

This question belongs to: Science Physics

Question #3 Report Error

The magnetic field at the center of a circular coil of radius R carrying current I is:

A. μ₀NI/(4πR)

B. μ₀NI/(2R)

C. μ₀I/(2R)

D. μ₀I/(4R)

View Answer & Solution Discuss

Correct Answer: Option B

Explanation:
For a circular coil with N turns, magnetic field at center B = μ₀NI/(2R). For single turn (N=1), B = μ₀I/(2R). This derives from Biot-Savart law. Option A is for single turn; B and D have incorrect constants. Memory tip: 'Coil center: B = μ₀NI/(2R); straight wire: B = μ₀I/(2πr)'. This formula application is frequently tested in magnetism sections of competitive exams. Always note number of turns N; competitive exams often include it to test attention to detail.

This question belongs to: Science Physics

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