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WorksheetsDielectric and Superconductivity
Total questions: 25
Worksheet time: 13mins
Name
Class
Date
1.
The total polarization value decreases with increase in __________________
a)
Intensity
b)
frequency
c)
temperature
d)
time
2.
The dielectric loss can occur in _________________ voltage
a)
Direct
b)
alternating
c)
both a and b
d)
lower
3.
In _________________ region, the power loss is less
a)
Visible
b)
optical
c)
Infrared
d)
ultraviolet
4.
The electric field strength at which the dielectric breakdown occurs is known as _________________
a)
dielectric voltage
b)
dielectric strength
c)
dielectric constant
d)
avalanche breakdown
5.
When mobility of ions are increases, insulation resistance decreases and hence dielectrics become __________________
a)
conductors
b)
Insulators
c)
Super conductor
d)
semiconductors
6.
In some materials, the electrical resistance becomes zero, when they are cooled to _________________
a)
High temperature
b)
low temperature
c)
very high temperature
d)
very low temperature
7.
Superconductivity was observed by ______________________
a)
Bardeen
b)
Ginzburg landau
c)
H Kamerclingh onnes
d)
Schrieffer
8.
The temperature at which a normal conductor loses its resistivity and becomes a superconductors in known as ________________
a)
Critical temperature
b)
transition temperature
c)
H Kamerclingh onnes
d)
constant temperature
9.
If the transition temperature is low , then the superconductors are known as ____________________superconductors
a)
High temperature
b)
low temperature
c)
very high temperature
d)
very low temperature
10.
If the transition temperature is high, then the superconductors are known as ____________________ superconductors
a)
High temperature
b)
low temperature
c)
very high temperature
d)
very low temperature
11.
The quantas of energy which are emitted during lattice vibrations are called ______________
a)
Phonons
b)
photons
c)
protons
d)
none of these
12.
In metals the electrical resistivity is due to ______________________
a)
Presence of impurities
b)
lattice vibrations
c)
both a and b
d)
Ideal resistivity
13.
For impure metals, at low temperature the value of resistivity is _________________________
a)
Minimum
b)
maximum
c)
zero
d)
none of these
14.
The field required to destroy the super conducting property is called as ______________________
a)
Magnetic field
b)
critical magnetic field
c)
critical field
d)
constant field
15.
The value of critical field with be _______________________for all materials
a)
same
b)
different
c)
ideal
d)
constant
16.
Superconducting material exhibits perfect _______________________________
a)
paramagnetism
b)
ferromagnetism
c)
diamagnetism
d)
none of these
17.
The susceptibility of superconducting material is __________________
a)
positive
b)
negative
c)
constant
d)
zero
18.
The thermo-electric effect disappears In the ________________________ state
a)
superconducting
b)
conducting
c)
semiconducting
d)
metastable
19.
The transition temperature varies due to presence of ____________________
a)
ISO tones
b)
ISO bars
c)
iSOtopes
d)
ISOchars
20.
Two critical field exisist in _______________________ superconductors
a)
type I
b)
type II
c)
soft
d)
none of these
21.
Which of the following is an example for type II superconductors ?
a)
Pb
b)
Zn
c)
Ga
d)
Vanadium
22.
London theory is a ____________________ theory
a)
macroscopic
b)
microscopic
c)
quantum
d)
classical
23.
BCS theory is a ____________________ theory
a)
macroscopic
b)
microscopic
c)
quantum
d)
classical
24.
High temperature superconductor have ______________________ crystal structure
a)
monoclinic
b)
cubic
c)
perovskite
d)
triclinic
25.
When the magnetic field is greater than critical field superconducting property ____________________
a)
appears
b)
disappears
c)
non persist
d)
sustain for very long time
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