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Quiz 2
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Q.1
Which of the following are true for relative dielectric constant?
1. It is dimensionless.
2. It is equal to 1 for vacuum.
3. It is equal to 1 for all substances.
1 and 2 only
2 and 3 only
1 and 3 only
1, 2 and 3
Q.2
In an intrinsic semiconductor, at a given temperature T
The number of electrons-hole pairs generated per second due to thermal motion are equal to the number of electron-hole pairs lost per second due to recombination
The number of electron-hole pairs generated per second due to thermal motion is always less than the number of electron-hole pairs lost per second due to recombination
The number of electron hole pairs generated per second due to thermal motion is always more than the number of electron-hole pairs lost per second due to recombination
Any of the above
Q.3
Spontaneous magnetisation is characteristic of ferromagnetic materials.
True
False
Q.4
Schrodinger wave equation is a
Linear equation
Differential equation
Partial differential equation
None of the above
Q.5
Debye temperature of metals is
About 10 K
About 200 K
About 600 K
About 2 K
Q.6
Electric dipole moment is expressed in debye unit.
True
False
Q.7
The unit for mmf is
A
Wb
T
V
Q.8
The fact that domains exhibits spontaneous magnetisation is
First hypothesis is of Curie
Second hypothesis is of Weiss
Curie-Weiss law
Boltzmann’s statistics
Q.9
The number of protons in a silicon atom are
4
8
12
14
Q.10
The resistance of a photoconductor
Increases with increase in light intensity
Decreases with increase in light intensity
May increase or decrease with increase in light intensity
Remains constant
Q.11
At room temperature the number of conducting electrons in an intrinsic semiconductor
Is almost equal to the number of valence electrons
Is about half the number of valence electrons
Is small as compared to the number of valence electrons
Is a very small fraction of the number of valence electrons
Q.12
In solid insulator materials having only one kind of atom, the types of polarization which exist are
Electronic only
Electronic and ionic
Electronic, ionic and permanent
Q.13
Piezoelectricity means the slight change in dimensions of a specimen when an electric field is applied.
True
False
Q.14
A leakage capacitor can be represented by a capacitance C and resistance R in parallel C.
True
False
Q.15
Many compounds also exhibit semiconducting properties.
True
False
Q.16
The dielectric losses do not depend on frequency.
True
False
Q.17
A characteristic property of crystal is its periodicity of structure.
True
False
Q.18
A vacant electronic state moves in the same direction as would a positive charge carrier.
True
False
Q.19
An atom of a rare gas is placed is an electric field E. Then
The nucleus will be shifted in the direction of E by an amount which is proportional to E.
The nucleus will not be shifted.
The nucleus will be shifted in the direction of E by an amount which is independent of E.
The nucleus will be shifted in a direction opposite to that of E.
Q.20
Above a certain temperature, the specific heat of a metal becomes constant. This temperature is called
Debye temperature
Curie temperature
Neel temperature
Transition temperature
0 h : 0 m : 1 s
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