Q.1.
The merger of hole and free electron is called
Q.2.
Electrical contact materials used in switches, brushes, relay must possess
Q.3.
In an intrinsic semiconductor, at a given temperature T
Q.4.
The resistance of a photoconductor
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.
Q.6.
On the basis of the type of chemical bonds, solids may be classified into
Q.7.
In van der walls crystals, there exists a high degree of stability of the outer electron shell.
Q.8.
A vacant electronic state moves in the same direction as would a positive charge carrier.
Q.9.
In solid insulator materials having only one kind of atom, the types of polarization which exist are
Q.10.
At room temperature the number of conducting electrons in an intrinsic semiconductor
Q.11.
Schrodinger wave equation is a
Q.12.
Spontaneous magnetisation is characteristic of ferromagnetic materials.
Q.13.
Piezoelectricity means the slight change in dimensions of a specimen when an electric field is applied.
Q.14.
Debye temperature of metals is
Q.15.
Electric dipole moment is expressed in debye unit.
Q.16.
A leakage capacitor can be represented by a capacitance C and resistance R in parallel C.
Q.17.
Many compounds also exhibit semiconducting properties.
Q.18.
The rule that resistivity of conductors can be separated into two parts viz. temperature independent and temperature dependent is known as
Q.19.
Above a certain temperature, the specific heat of a metal becomes constant. This temperature is called
Q.20.
An atom of a rare gas is placed is an electric field E. Then