Master of Science I Physics (Material Science) Examination:
Oct Nov 2016 Semester I (New CBCS)
SLR No. Day
Date Time Subject Name Paper
No. Seat No.
SLR SH
533
Friday
18/11/2016
10.30 AM
to
01.00 PM
Condensed Matter
Physics
C
HCT 1.2
Instructions: Attempt five questions
Q. no. 1 and Q.no 2 are compulsory
Attempt any three questions from Q. No.3 to Q.No. 7
Figures to the right indicate full marks
Use of non scientific calculators is allowed
Total Marks: 70
Q.1 Choose correct alternative 08
For a diamond structure the packing fraction is given by


How many atoms per unit cell are in FCC structure
1 2
4 6
The one which is not compatible with crystal symmetry is
One fold symmetry Three fold symmetry
Five fold symmetry Six fold symmetry
Ice is an example of
Triclinic system Hexagonal system
Orthorhombic system Monoclinic system
The class having the highest possible symmetry for a system is called
Hemihedral Tetrahedral
Honochedral Dihedral
At lower temperature the lattice specific heat varies as
T3 1⁄T3
T 1⁄T
For type I superconductor, the surface energy is
Always positive Always negative
Sometimes positive and
sometimes negative
Depends on its Tc
Hard superconductor's observed
Breakdown of silsbee's
rule
Incomplete Meissener effect
High critical field and
transition temperature
All of these
Page 1 of 2
State true or false.
The packing factor of the FCC structure is 74%
True False
Zinc metal crystallize in FCC structure
True false
A plane parallel to one of the co ordinate axes has an intercept of
infinity
True False
The range of first Brillouin zone is k
True False
The effective mass of an electron in a semiconductor is negative near
the top of the band
True false
The entopy and thermal conductivity decrease in superconducting state
True False
Q.2 Attempt following. 14
Effective mass
Static dielectric constant for gases
Meissner effect
05
05
04
Q.3 What is brillouin zones Construct the Fermi surfaces in brillouin
zones for two dimensional lattices
Show that reciprocal lattice vector σhkl corresponds to the reciprocal of
dhkl
10
04
Q.4 Explain with E K diagram periodic zone scheme, extends zone
scheme and reduced zone
Explained why the conductivity of a semiconductor chages with
impurity content.
10
04
Q.5 What is dielectric polarization give the expression for electronic
polarizability.
Discuss the intrinsic carrier concentration
10
04
Q.6 Explain the internal field in solids
Explain the penetration depth and coherence length
08
06
Q.7 Give qualitative idea of BCS theory for superconductor
Explain type I and type II super conductors