Engineering Physics Unit 4 – Fiber Optics and Laser: important questions for AKTU
Unit 4 (Fiber Optics and Laser) questions that AKTU repeats most often. This unit carries about 26 marks per paper. Start with the repeated questions, then the most asked topics.
Most repeated Unit 4 questions
- Explain the term acceptance angle, acceptance cone and numerical aperture of an optical fiber with labelled diagram and derive expression for numerical aperture in terms of relative refractive index difference. (7 marks, 2025, Optical Fiber Basics) – also asked in 2021, 2022, 2023, 2024, 2025, 2026
- Explain the construction and working of He-Ne laser with proper-labelled diagram. (7 marks, 2025, Types of Lasers) – also asked in 2021, 2022, 2023, 2024, 2025, 2026
- Describe the construction and working principle of a He-Ne laser with the help of a suitable diagram. (7 marks, 2026, Types of Lasers) – also asked in 2021, 2022, 2023, 2024, 2025
Most important Unit 4 topic
- Optical Fiber Basics (Unit 4: Fiber Optics and Laser) – asked 18 times in 2021, 2022, 2023, 2024, 2025, 2026
Most asked Unit 4 topics
- Optical Fiber Basics – asked 18 times
- Laser Fundamentals – asked 14 times
- Types of Lasers – asked 9 times
More Unit 4 previous year questions
- Differentiate between spontaneous emission and stimulated emission of radiation. (2 marks, 2026, Laser Fundamentals)
- Explain the role of population inversion in laser action. (2 marks, 2026, Laser Fundamentals)
- What is the difference between step index fibre and graded index fibre? Explain with suitable diagrams. Also discuss the mechanism of light propagation in both types of optical fibres. (7 marks, 2026, Optical Fiber Basics)
- What are the sources of attenuation of signal in an optical fibre? Explain. (7 marks, 2026, Fiber Optic Communication)
- What do you mean by population inversion? (2 marks, 2025, Laser Fundamentals)
Unit 4 syllabus topics
- Optical Fiber Basics
- Fiber Optic Communication
- Laser Fundamentals
- Types of Lasers