Question Bank : Physics
Unit 1:
1. Explain the following :
a) Metastable state b) Pumping
c) Stimulated Emission d) Population Inversion
e) Resonant cavity f) Spontaneous emission
2. Explain the construction and working of Carbon-dioxide Laser with a neat and labelled
diagram. Also draw Energy level diagram for the same
3. Explain the process of recording and reconstruction of holography technique with
required diagrams
4. What is the principle used in optical fibre? Differentiate between Step Index and Graded
index optical fibre.
5. What are mono mode and multimode optical fibres
6. Derive the expression for Numerical Aperture of optical fibre
7. Write the expression for Numerical aperture, acceptance angle, acceptance cone
8. What is attenuation constant? What are the causes of attenuation?
Unit -2
9. State the de Broglie hypothesis and derive the equation of de Broglie wavelength in
terms of kinetic energy.
10.State the de Broglie hypothesis and show that the de Broglie wavelength is inversely
proportional to square root of accelerating potential
11.Derive the Schrodinger’s time independent equation by setting up a wave equation
using the de Broglie wavelength.
12.Derive an expression for the energy levels of a particle enclosed in an infinite potential
well. Hence explain how the results regarding the energies of a microscopic particle vary
from the macroscopic world.
13.Derive an expression for the wave function of a particle enclosed in an infinite potential
well.
14.Give the Graphical representation for ψ and for infinite potential well.
15.Explain Barrier tunneling .Write a short note on Scanning tunneling microscope
Unit -3
16.Derive the equation of path difference for a thin film of uniform thickness and hence
derive the condition of maxima and minima in reflected system.
17.Write the equation of fringe width in Wedge shaped film. Show that the fringe width
remains constant
18.Explain i) Testing of Optical flatness
ii) Explain Anti reflection coating.
19.Define and derive Malus law
20.Explain double refraction & hence explain the phenomenon on the basis of Huygen’s
wave theory.
Unit -4
21.Explain how materials are classified into conductors, insulators and semiconductors
using Energy band diagrams
22.What is Fermi-Dirac distribution function? Define terms used in the expression.
23.Define Fermi energy level for conductors and semiconductors?
24.Show the location of Fermi energy levels in intrinsic and extrinsic semiconductors in
band energy diagram.
25.Explain the working of a P-N junction diode under zero, forward and reverse bias on the
basis of energy band diagram.
26.Is the Hall effect observed in conductors? Write applications of Hall effect.
27.Explain Hall Effect? Derive the expression for Hall voltage and Hall coefficient.
28.Explain the construction and working of solar cell. Draw the I-V characteristics
curve. Define fill factor, short circuit current and open circuit voltage
29.What is Piezoelectric effect. Explain construction and working of piezoelectric oscillator
(using transistor) for generation of Ultrasonic waves
30.Write down the characteristics of Ultrasonic waves.
31.What is Echo sounding? Explain the application of Ultrasonic waves in flaw detection
technique
Unit -5
32.Show that Fermi energy level of intrinsic semiconductor lies at the center of the band
gap.
33. Define: Superconductivity, Critical temperature, Persistent current, Critical Magnetic
field, Critical current
34.Explain Meissner effect
35. Show that superconductors are perfectly diamagnetic in nature
36.Differentiate between Type I and Type II superconductor
37. Explain D.C and A.C Josephson effect
38. What is Nanotechnology? Explain Quantum confinement effect accounts for change in
properties of nanoparticles.
39.Explain Ball Milling method for synthesis of nanoparticles
40.Explain how Physical Vapour deposition Method is used for synthesis of Nanoparticles
41.Explain the optical and electrical properties of Nanoparticles
42.Explain the applications of Nanoparticles in
i) Automobiles ii) Medicine iii) Energy iv) Environment v) Electronics
47. Explain the targeted drug delivery in Medical field using Nanotechnology
Extra Questions:
1. Write a short note on Quantum computing
2. Explain the mechanical and magnetic properties of Nanoparticles
3. Write note on SQUIDS?
Numericals:
Refer to any text book
