Q. Two materials having temperature coefficients of 0.004 and 0.0004 respectively are joined in series. The overall temperature coefficient is likely to be

View solution

Q. Diamond is a paramagnetic material.

View solution

Q. Which capacitor-store higher amount of energy?

View solution

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