Most Important Questions for Engineering Physics Exams

1. Engineering Physics (Exam Preparation) Time: 3 Hours Maximum Marks: 100 Instructions: 1. Attempt all questions. 2. Answers should be concise and to the point. 3. Use diagrams wherever necessary. 4. Assume suitable data if not provided. 5. Part A: Short Answer Questions (20 Marks) 1. Explain the concept of wave-particle duality. (4 Marks) 2. Describe the photoelectric effect and its significance. (4 Marks) 3. What are Miller indices? How are they used in crystallography? (4 Marks) 4. State and explain the Heisenberg Uncertainty Principle. (4 Marks) 5. Differentiate between conductors, semiconductors, and insulators based on their energy band structure. (4 Marks) Part B: Medium Answer Questions (30 Marks) 6. Derive the expression for the energy levels of a particle in a one-dimensional infinite potential well. (6 Marks) 7. Discuss the working principle of a LASER and mention its applications. (6 Marks) 8. Explain Bragg's Law and its application in X-ray diffraction. (6 Marks) 9. Describe the concept of superconductivity and explain the Meissner effect. (6 Marks) 10. Derive the Schrödinger equation for a free particle and discuss its physical significance. (6 Marks) Part C: Long Answer Questions (50 Marks) 11. (a) Explain the phenomenon of interference of light. Derive the conditions for constructive and destructive interference in Young’s double-slit experiment. (10 Marks) www.magicmarks.in

2. (b) Describe an experiment to measure the wavelength of light using a diffraction grating. (5 Marks) 12. (a) Discuss the concept of quantum tunneling. Explain its significance in modern electronics, particularly in the context of tunnel diodes. (10 Marks) (b) Explain the working principle of a scanning tunneling microscope (STM) and its applications in nanotechnology. (5 Marks) 13. (a) Derive the Maxwell-Boltzmann distribution law for the distribution of molecular speeds in a gas. (10 Marks) (b) Describe the concept of blackbody radiation and explain Planck’s law. How did it lead to the development of quantum theory? (5 Marks) 14. (a) Discuss the principle of fiber optics and its applications in communication technology. (10 Marks) (b) Explain the difference between step-index and graded-index fibers. (5 Marks) For a quick understanding of concepts, Magic Marks' video tutorials provide the easiest way to learn Engineering Physics. www.magicmarks.in