M.Sc. (Semester (CBCS) Examination Oct/Nov-2017
Physics (Materials Science)
CONDENSED MATTER PHYSICS
Day Date: Saturday, 18-11-2017 Max. Marks: 70
Time: 10.30 AM to 01.00 PM
Instructions: Attempt five questions.
Q. 1 and Q.3 are compulsory.
Attempt any three from Q.3 to Q.7.
Figures to the right indicate full marks.
Use of non scientific calculators is allowed.
Q.1 Select correct alternatives: 07
How many nearest neighbors are there for an atom in a hexagonal
close-packed crystal structure?
6 12
18 24
For a closed packed BCC structure of hard shares, the lattice
constant a is related to the sphere radius R is
a=4R/√3 a=4R√3
a=4R/√2 a=4R√3
Cooper pairs are formed
At very low temperature as the thermal energy is not sufficient to
disrupt the binding
At high temperature as the thermal energy is sufficient to formal
the cooper pair
At normal temperature as the thermal energy is sufficient to
formed the cooper pair
None of these
In formal an ionic bond in Potassium Fluoride Potassium ion

Gets a single positive charge
Gets a double positive charge
Gets a single negative change
Gets a double negative change
Poor conductors of electricity is a characteristic of
Ionic compounds Covalent compounds
Metallic compounds Diatec compounds
Point defect inside crystal cannot be produce by
Elastic Deformation
Quenching from high temperature
Plastic deformation
Irradiation with X-ray
Page 2 of 2
SLR-MO-514
In the meissner state the magnetic susceptibility of a superconductor
in S.I units is
1/4

The coherence length of the paired electron is
0.25 250 nm
0.01 nm 0.001 nm
Q.1 State whether following statements true or false: 06
The packing fraction for an SC lattice is smaller as compared to that
of FCC lattice
True False
Germanium and silicon have diamond structure for which the
molecules per unit cell are equal to 4
True False
The co-ordination number in case of FCC is 8
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 absolute value of velocity of electrons corresponding to the point
of inflection and E-k diagram is Maximum.
True False
Both type I and type II superconductors exhibit sharp in resistance at
the superconducting transition temperature.
True False
Q.2 Write short notes: 14
Complex dielectric constant. 05
Electron in periodic potential 05
Flux quantization 04
Q.3 Explain the X-ray scattering from solids including Laue conditions and line
intensities.
10
Explain the elementary concepts in solids. 04
Q.4 Explain periodic zone scheme, extended zone scheme and reduced zone
from E-K diagram.
10
Distinguish between a direct and indirect semiconductors on basis of their
Energy band structure.
04
Q.5 Explain the behavior of free electron in periodic potential. 10
Derive the equation for effective mass. 04
Q.6 Explain the dielectric relaxation in alternating fields. 10
Discuss about ionic polarzabilities. 04
Q.7 What is superconductor? Discuss London theory in detail. 10
State the characteristic properties of superconductor. 04