Q. Above ferroelectric curie temperature, spontaneous polarization in ferroelectric materials becomes stronger.

View solution

Q. In paramagnetic materials

View solution

Q. Assertion (A): Atomic number of sodium is 11.
Reason (R): Sodium has a body centred cubic lattice.

View solution

Q. The number of valence electrons in pentavalent impurity is

View solution

Q. If the diameter of a wire is doubled, its current carrying capacity becomes

View solution

Q. The law J = σE, where J is current density, σ is electrical conductivity and E is field strength is

View solution

Q. Assertion (A): Silicon is less sensitive to changes in temperature than germanium.
Reason (R): Cut in voltage in silicon is less than that in germanium.

View solution

Q. Material which lack permanent magnetic dipoles are known as

View solution

Q. The attraction between the nucleus and valence electron of copper atom is

View solution

Q. If the temperature of an extrinsic semiconductor is increased so that the intrinsic carrier concentration is doubled, then

View solution

Q. There is no hysteresis phenomenon is any dielectric material.

View solution

Q. The units of μ₀ and μᵣ are

View solution

Q. In metals the valence electron wave functions are strongly perturbed by the presence of neighbouring atoms.

View solution

Q. The classes of solid dielectrics are

View solution

Q. A 200 turn coil has a self inductance of 10 mH. If the number of turns is doubled, all other quantities remaining the same, the self inductance will be

View solution

Q. A material which is lightly repelled by a magnetic field is known as

View solution

Q. Which of the following is the poorest conductor of electricity?

View solution

Q. The magnetic moment in units of Bohr magneton of a ferrous ion in any ferrite is

View solution

Q. Assertion (A): The optical dielectric constant (i.e., εr at optical frequencies)of ionic dielectrics is less than static dielectric constant.

Reason (R): At optical frequencies, Pi = 0.

View solution

Q. A piece of iron is placed in a magnetic field

View solution