Q. When a trivalent impurity is added, the semiconductor becomes

View solution

Q. Iron has a body centred cubic structure.

View solution

Q. The units of polarization of dielectric are

View solution

Q. When a potential is applied across an intrinsic semiconductor, holes flow

View solution

Q. For magnetic shielding, we need a ferromagnetic material.

View solution

Q. Assertion (A): Electronic polarizability increases as atoms becomes larger.

Reason (R): For rare gas, ∈₀(∈ᵣ - 1) E = Nαe, where N is number of atoms/m³ and αe is electronic polarizability of material.

View solution

Q. In a metal, the valence electrons

View solution

Q. All magnetic materials exhibit the phenomenon of saturation.

View solution

Q. On the basis of the type of chemical bonds, solids may be classified into

View solution

Q. The units for intrinsic strength of dielectric are

View solution

Q. Specific resistance of silver is about

View solution

Q. The v-i relation for an arc is v = 44 + 30/i . If v = 50 V, i =

View solution

Q. Assertion (A): If an electron having charge e is revolving in an orbit of radius R and with angular velocity ω, the magnetic dipole moment of orbit is 0.5 eωR².

Reason (R): Orbital angular momentum and magnetic dipole moment are always equal.

View solution

Q. Assertion (A): A capacitor with imperfect dielectric can be represented by a capacitance in parallel with resistance.

Reason (R): For imperfect dielectrics, dielectric constant has real and imaginary parts.

View solution

Q. An atom of a rare gas is placed is an electric field E. Then

View solution

Q. In van der walls crystals, there exists a high degree of stability of the outer electron shell.

View solution

Q. As per temperature limits, the number of categories of solid dielectrics are

View solution

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