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Quiz 4
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Q.1
The merger of hole and free electron is called
Covalent bonding
Recombination
Thermal energy
Free electrons
Q.2
Electrical contact materials used in switches, brushes, relay must possess
High thermal conductivity and high melting point
Low thermal conductivity and low melting pointL
High thermal conductivity and low melting point
Low thermal conductivity and high melting point
Q.3
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.4
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.5
Which of the following are true for relative dielectric constant?It is dimensionless.It is equal to 1 for vacuum.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.6
On the basis of the type of chemical bonds, solids may be classified into
Ionic crystals
Ionic and valence crystals
Ionic crystal, valence crystals and metals
Ionic crystals, valence crystals, metal and vander wall crystals
Q.7
In van der walls crystals, there exists a high degree of stability of the outer electron shell.
True
False
Q.8
A vacant electronic state moves in the same direction as would a positive charge carrier.
True
False
Q.9
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
All of above
Q.10
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.11
Schrodinger wave equation is a
Linear equation
Differential equation
Partial differential equation
None of the above
Q.12
Spontaneous magnetisation is characteristic of ferromagnetic materials.
True
False
Q.13
Piezoelectricity means the slight change in dimensions of a specimen when an electric field is applied.
True
False
Q.14
Debye temperature of metals is
About 10 K
About 200 K
About 600 K
About 2 K
Q.15
Electric dipole moment is expressed in debye unit.
True
False
Q.16
A leakage capacitor can be represented by a capacitance C and resistance R in parallel C.
True
False
Q.17
Many compounds also exhibit semiconducting properties.
True
False
Q.18
The rule that resistivity of conductors can be separated into two parts viz. temperature independent and temperature dependent is known as
Matthiessen’s rule
Debye rule
Curie rule
Onne’s rule
Q.19
Above a certain temperature, the specific heat of a metal becomes constant. This temperature is called
Debye temperature
Curie temperature
Neel temperature
Transition temperature
Q.20
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.
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