Engineering Physics — Major (End Semester) 2021 question paper

Paper details

• Subject: Engineering Physics (BSM-177)
• Branch: Chemical Engineering
• Semester: 1
• Exam: Major (End Semester) 2021
• Questions: 24

Questions asked in Engineering Physics Major (End Semester) 2021

1. Q1(a). What is lattice plane? How are the lattice planes described in terms of Miller indices? [2 marks]
2. Q1(b). Define unit cell. Obtain the Miller indices of a plane which intercepts at (a, b/2, 3c) in an SC unit cell. [2 marks]
3. Q1(c). What is wave-particle duality? [2 marks]
4. Q1(d). State and explain Heisenberg's uncertainty principle. [2 marks]
5. Q1(e). Write the Maxwell's equation in integral and differential forms. Explain each equation. [2 marks]
6. Q1(f). What is the band theory of solids? Classify conductors, insulators and semiconductors on the basis of band theory of solids. [2 marks]
7. Q1(g). What is mobility? How it varies with life time of electron and its effective mass? [2 marks]
8. Q2(a). What is Bravias lattice. For SC, FCC, and BCC, determine the following: (1) lattice point per unit cell (2) nearest neighbour distance (3) atomic packing factor. [5 marks]
9. Q2(b). Derive Bragg's equation for reflection of X-rays by crystal planes. The angle of reflection for monochromatic X-rays for a crystal whose atomic spacing is 2.0 A is 30°. Calculate the wavelength of X-rays. [5 marks]
10. Q2(c). Discuss the seven types of crystal systems? How are they different from each other? [5 marks]
11. Q3(a). What is the importance of Schrödinger wave equations? Deduce time-independent Schrödinger wave equation? [5 marks]
12. Q3(b). Describe the Davisson and Germer experiment to demonstrate the wave nature of a particle. [5 marks]
13. Q3(c). Write energy eigen value expression for a particle in one dimensional box. Calculate the values of energy of an electron in a one-dimensional box with impenetrable walls of length 1 Å for n = 1 and n = 2. [5 marks]
14. Q4(a). Write Maxwell's equations in free space. Show that the velocity of plane electromagnetic waves in the free space is given by C = 1/√(μου), where με and ɛ are permittivity and permeability of free space respectively. [5 marks]
15. Q4(b). Deduce Maxwell's four equations in free space. Explain the concept of Maxwell's displacement current and show how it led to the modification of Ampere's law. [5 marks]
16. Q4(c). Define skin depth or depth penetration. The maximum electric field in a plane electromagnetic wave is 102 N/C. The wave is going in the X-direction and the electric field is in the Y-direction. Find the maximum magnetic field in the wave in its direction. [5 marks]
17. Q5(a). A sample of intrinsic germanium has 0.36 and 0.17 m2/V-s electron and hole mobilities respectively. If the density of electrons and holes are each equal to 2.5 x 10¹8 per meter cube, find the electrical conductivity and resistivity of the sample. [5 marks]
18. Q5(b). Explain the variation in magnetization with applied magnetic field in Type I and Type II superconductors. Give some examples of both types. Write down characteristics of superconductor. [5 marks]
19. Q5(c). What is nanoscience and nanotechnology? Differentiate between top-down and bottom-up method of nanoparticle synthesis. [5 marks]
20. QQ1. Attempt any Five parts of the following. (All Unit)
21. QQ2. Attempt any Two parts of the following. (Unit-I)
22. QQ3. Attempt any Two parts of the following. (Unit-II)
23. QQ4. Attempt any Two parts of the following. (Unit-III)
24. QQ5. Attempt any Two parts of the following. (Unit-IV)