Crystal Physics B.E Question Bank : dmice.ac.in

Name of the College : DMI College OF Engineering
Dept : Physics
Subject Code/Name : PH6151-Crystal Physics
Degree : B.E
Year/Sem : I/I
Website : dmice.ac.in
Document Type : Question Bank

Crystal Physics : https://www.pdfquestion.in/uploads/dmice.ac.in/2794-Physics.pdf

DMI Crystal Physics Question Paper

UNIT I

Part- A :
1. What is a space lattice?
2. What is a unit cell ?
3. Name the seven crystal systems ?
4. What is primitive cell ?

Related : DMI College OF Engineering HS6151 Technical English B.E Question Bank : www.pdfquestion.in/2797.html

5. Name the crystal structure of the following : (a) Gold (b) Germanium (c) Barium (d) Zinc
6. Bismuth has a = b = c = 4.47 A and angles a = ß = ?= 60° . What is its crystal structure ?
Given a = b = c = 4.47 A, a = ß = ?= 60°
Since a = b = c and a = ß = ?
7. What are Bravais lattices ?
8. Given the value of number of atoms in unit cell of SC, BCC, FCC and HCP.
9. Define coordination number ?
10. What are the coordination number for SC, BCC, FCC, HCP and Diamond?

11. Define atomic radius.
12. Obtain the formula for atomic radius ‘r’ in term of lattice constant ‘a’ for a simple cubic.
13. Arrive at an expression for atomic radius in term of lattice parameter for BCC.
14. Derive an expression for atomic radius in term of lattice parameter for FCC.
15. Define packing factor. What is its unit?
16. Calculate packing factor in the case of simple cubic structure.
17. Calculate packing factor of body centred cubic crystal.
18. What are crystalline materials? Give example.
19.What is a crystal ?
20. What are Miller indices?
21. Give the expression for interplanar spacing for a cubic interms of lattice constant and Miller indices.
23. Sketch (111) plane for a cubic crystal.(Diagram)
24.What are lattice points?
25.What are the advantages of Czochralski method?

PART-B :
1.Define the terms ‘Atomic radius and packing factor.Calculate the above for SC, BCC, and FCC structures.
2.Describe the structure of a HCP crystal. Give details about its atomic radius , atomic packing and axial ratio.
3.What is packing ? Prove that the packing factor of HCP is 0.74.
4.(i)Show that the atomic packing factor of FCC and HCP are the same .
(ii)What are Miller indices? Explain how they are determined.
5.Describe Bridgman method of crystal growth. Mention its advantages and disadvantages.
6.Explain Czochralski method of growing crystal. Mention merits and demerits.
7.Describe the solution growth of crystal and list out its advantages and disadvantages.
8.Explain the vapour growth techniques of growing crystals.

UNIT II

PROPERTIES OF MATTER & THERMAL PHYSICS : (PART- A)
1. What is elasticity?
2. What are elastic bodies?
3. Define stress and its unit.
4. What are the type stresses?
5. Define strain and its unit.
6. What are the types of strains?88
7. State Hooke’s law.
8. What are the types of moduli of Elasticity?
9. Define Young’s modulus of elasticity.
10.Define rigidity modulus and mention its unit.
11.What is stress – strain diagram?
12.Define bending moment of a beam.
13.What is uniform bending ?
14. What is I Shape Girder?
15.What are advantages of I shape girder?
16. What is cantilever?
17. Define heat conduction.
18. Define coefficient of thermal conductivity and mention its unit .
19.What is basic principle behind lee’s disc method in determine thermal conductivity of bad conductor?
20.What are the characteristics of good and bad conductors?
21.What is thermal resistance?
22. What is radial flow of heat ?
23.Define Newtion ‘s law of cooling.
24. What are limitations of Newton’s law of cooling?
25.Define Bulk modulus and mention its unit.

Unit – III

PART -A QUS & ANS
1.Derive an expression for the internal bending moment of a beam in terms of radius of curvature.
2. What is cantilever? Obtian an expression for the depression at the loaded end of a cantilever whose other end is fixed assuming that its own weight is not effective in bending.
3.Derive an expression for the elevation at the centre of a beam which is loaded at both ends. Describe an experiment.
4.Write a note on stress strain diagram. Explain the factors affecting the elasticity.
5.Derive the equation for one dimensional flow of heat and solve it under steady state condition .
6.Describe with relevant theory the method of determining the coefficient of thermal conductivity of a bad conductor by Lee’s disc method .
7.Derive an expression for the quantity of heat flow through a metal slab whose faces are kept at two different temperatures. Use this expression to determine the thermal conductivity of a bad conductor by Lees’s disc method.
8.Describe a method of determining thermal conductivity of rubber