Q. At room temperature the number of conducting electrons in an intrinsic semiconductor

View solution

Q. Assertion (A): The angular momentum of an atom is due to three contributions viz. orbital, electron spin and nuclear spin.

Reason (R): The nuclear spin magnetic moment is much more than electron spin magnetic moment.

View solution

Q. If WF is the Fermi level, then in a metal at T = 0

View solution

Q. Silicon and germanium have diamond structure. The number of atoms in a volume equal to a³ where a is the edge of elementary cube are

View solution

Q. If the radius of electron cloud around the nucleus of a rare gas atom is R, the electronic polarizability of the atom is porportional to

View solution

Q. By inserting a plate of dielectric between the plates of a parallel plate capacitor, the energy stored in the capacitor is increased five times. The dielectric constant of material is

View solution

Q. Debye temperature of metals is

View solution

Q. As the viscosity of a liquid increases, the relaxation time

View solution

Q. A wire is carrying current I. The field intensity H at a distance r from the wire

View solution

Q. The materials which become polarized on the application of mechanical stress are called piezoelectric.

View solution

Q. The rule that resistivity of conductors can be separated into two parts viz. temperature independent and temperature dependent is known as

View solution

Q. Above a certain temperature, the specific heat of a metal becomes constant. This temperature is called

View solution

Q. A dielectric material must be

View solution

Q. Spontaneous magnetisation is characteristic of ferromagnetic materials.

View solution

Q. A leakage capacitor can be represented by a capacitance C and resistance R in parallel C.

View solution

Q. Electric dipole moment is expressed in debye unit.

View solution

Q. A vacant electronic state moves in the same direction as would a positive charge carrier.

View solution

Q. Piezoelectricity means the slight change in dimensions of a specimen when an electric field is applied.

View solution

Q. Many compounds also exhibit semiconducting properties.

View solution

Q. A characteristic property of crystal is its periodicity of structure.

View solution