M.Sc. Physics (Materials Science) (Semester
(CBCS) Examination, 2017
CONDENSED MATTER PHYSICS
Day Date: Saturday, 20-04-2017 Max. Marks: 70
Time: 10.30 AM to 01.00 PM
Instructions: Attempt five questions.
Q and Q. are compulsory.
Attempt any three from Q.3 to Q.7.
Figures to the right indicate full marks.
Use of non scientific calculator allowed.
Q.1 Select correct alternative. 08
Density of a crystal remains unchanged as a result of.
Vacancy defect Interstitial defect
Frankel defect Schottky defect
Which one of the following compound exhibits both Schottky and
Frenkel Defects?
NaCl AgCl AgBr Agl
For a closed packed BCC structure of hard spheres, the lattice
constant a is related to the sphere radius R is
a=4R/√3 a=4R/√3 a=4R/√2 a=4R/√2
At lower temperature the lattice specific heat varies as.
T3 T3 T 1/T
Ice is an example of.
Triclinic system Hexagonal system
Orthorhombic system Monoclinic system
The susceptibility of a superconductor is.
Positive and small Positive and unity
Negative and small Negative and unity
Superconducting electron density is.
Finite at absolute zero
Zero at absolute zero
Infinite at absolute zero
Non-zero finite at critical temperature
Page 1 of 2
BCS theory assume a
Spherical FS and isotropic energy gap
Spherical FS and anisotropic energy gap
Non spherical FS and isotropic energy gap
Non spherical FS and anisotropic energy gap
State Truth of False: 06
Ionic bonding for a crystal with alternate and evenly spaced
positive and negative ions is.
True False
Germanium is a covalently bonded crystal.
True False
An SC lattice is reciprocal lattice to an FCC lattice.
True False
The form of the graph between energy E and wave vector k for
an electron in periodic lattice is parabolic.
True False
The form of the graph between energy E and wave vector k for
an electron in periodic lattice is parabolic.
True False
The conventional superconductor is paramagnetic below Tc
True False
Q.2 Attempt following: 14
Orientation polarization 05
Complex dielectric constant 05
Heat capacity 04
Q.3 Explain with E-K diagram periodic zone scheme, Extended zone
scheme and reduced zone.
10
Differentiate polycrystalline, nanocrystalline and amorphous
materials.
04
Q.4 What is brillouin zones? Construct the Fermi surfaces in brillouin
zones for two-dimensional lattices.
10
Explain the indirect band gap semiconductors. 04
Q.5 What is dielectric polarization? Give the expression for electronic
polarizabiliy.
10
Introduced the methods for calculations of energy bands and their
features.
04
Q.6 Explain the dielectric relaxation in alternating fields. 06
What is Meissner effect? Derive relation for penetration depth. 06
Q.7 What is superconductor? Discuss London theory in detail. 10
Difference between type I and II superconductors. 04