Name of the University : North Maharashtra Universit
Degree : B.Sc
Department : Electronics
Year : III
Name Of The Subject : ELE311 Semiconductor Physics
Document type : Question Bank
Website : nmu.ac.in
Download Model/Sample Question Papers :https://www.pdfquestion.in/uploads/nmu.ac.in/5254-T.%20Y.%20B.%20Sc.%20Electronics.pdf
Semiconductor Physics Model Paper :
T.Y.B.Sc. Electronics (Paper I)
ELE.311
Unit I : Crystal Structure
Questions for 2 marks
1) Explain the term co-ordination number.
2) Explain the term packing fraction.
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3) What is primitive translational vector?
4) Explain the idea of unit cell.
5) What is the atomic radius? What is the atomic radius for FCC crystals?
6) Write the values of the packing fraction of SC and FCC.
7) Calculate the packing fraction of BCC crystals.
8) State the properties of reciprocal lattice.
9) What are the Millar indices of a plane?
10) Explain Millar Indices.
11) Calculate Millar Indices of a plane making intercepts 6a, 2b and 6c on x, y, and axes respectively.
12) What is reciprocal lattice?
13) Write reciprocal lattices of SC crystals.
Questions for 4 marks :
1) What is Millar Indices? What are Millar Indices of a plane making intercepts 2a, 3b, 6c on three axes.
2) Show that packing fraction of FCC and SC structures are 0.74 and 0.52 respectively.
3) Draw neat diagrams of SC and BCC structures.
4) Draw neat diagrams primitive lattice cell of SC and BCC structures.
5) Show that reciprocal of a reciprocal lattice is the original lattice.
6) Show that packing fraction for FCC is p/3v2.
7) Show that packing fraction for BCC is pv3/6.
8) What is atomic radius? Calculate atomic radius for BCC crystals?
9) Show that reciprocal lattice of FCC is the direct lattice for BCC.
(Note: Question of 4 marks may be asked for 6 marks expecting more detail answer)
Unit II: Band theory of solids :
Questions for 2 marks :
1) What is energy band?
2) Explain the concept of hole.
3) Explain origin of energy bands in crystals.
4) Describe in brief free electron model.
5) Draw energy band of conductors and semiconductors.
6) Draw energy band of conductors and insulators.
7) Distinguish between conductors and semiconductors.
8) What is effective mass m*?
Questions for 4 marks :
1) Distinguish between conductors, insulators and semiconductors with energy
band digram.
2) Discuss electronic motion according to band theory.
3) Write a note on free electron theory model.
4) Write a note on hole.
5) Show that effective mass of an electron under the influence external electric field moving in energy band is m*=h
Unit III: Charge carriers in semiconductor :
Questions for 2 marks :
1) What is intrinsic semiconductor?
2) What is extrinsic semiconductor?
3) What is direct semiconductor? Give example
4) What is indirect semiconductor? Give example
5) What is Fermi energy?
6) Explain in short Fermi dirac distribution function against temperature.
7) What is drift carriers? Give expression.
8) Give expression of electrical conductivity.
9) Give the expression of electron concentration in conduction band.
10) Give the expression of hole concentration in valence band.
11) Explain Hall effect in material
12) Explain Hall coefficient.
Questions for 4 marks :
1) Explain Fermi-dirac distribution function against temperature.
2) Derive the expression of electron concentration in conduction band.
3) Derive the expression of hole concentration in valence band.
4) Explain Hall effect with diagram.
5) Explain Fermi level and Fermi energy.
6) Derive the expression for mobility and electrons in electronic and magnetic field.
7) What is Hall effect? Obtain an expression for Hall coefficient.
8) Distinguish between direct and indirect semiconductor.
(Note: Question of 4 marks may be asked for 6 marks expecting more detail answer)
Unit IV: P-N Junction and Integrated Circuits
Questions for 2 marks :
1) Give different steps in fabrication of P-N junction.
2) Mention different methods of fabrication of P-N junction.
3) Explain donar impurity.
4) Explain acceptor impurity.
5) What is the contact potential?
6) How monolithic circuits are fabricated/
7) What is merged transistor?
8) Explain forward bias P-N junction.
9) Explain reverse bias P-N junction.
10) Explain current flow at junction.
Questions for 4 marks :
1) Explain Zener break down process.
2) Explain donar and acceptor impurities in semiconductors.
3) Explain the Avalaunche break down process in P-N junction.
4) Write a note on reverse break down.
5) Explain how monolithic circuits are fabricated.
6) Explain the idea of merged transistors.
7) Write a note on monolithic circuits.