B.Tech I Semester (R20) Supplementary Examinations May-2023

ENGINEERING PHYSICS

(Common to CSE, ECE & EEE)

Time: 3 hours Max. Marks: 70

Note: Answer all questions from Part – A & Part – B.

PART – A (7 x 2 = 14 Marks)

1. a) Define reverberation and reverberation time.

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b) What is Piezo-electric effect?

c) Define Fermi level and Fermi energy.

d) Distinguish direct and indirect band gap semiconductors.

e) Define magnetic susceptibility and permeability.

f) Mention any four applications of nano materials.

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g) Define numerical aperture and acceptance angle.

PART – B (4 x 14 = 56 Marks)

2. a) What are ultrasonic waves? Describe a method of producing ultrasonic waves.

(OR)

b) What is absorption coefficient? Deduce Sabine’s formula for reverberation time.

3. a) Classify solids based on band theory of solids. Explain each type with a neat diagram.

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(OR)

b) Explain the formation of p-n junction diode and discuss its V-I characteristics.

4. a) Define Hysteresis. Explain the origin of Hysteresis on the basis of domains.

(OR)

b) Explain the synthesis of nanomaterials by ball milling and sol-gel methods.

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5. a) What is a laser? Explain the principle and working of He-Ne laser with neat energy level diagram.

(OR)

b) Define optical fiber and derive an expression for acceptance angle and numerical aperture of optical fiber.

Question Paper Code: 2010105

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