Q. Sulphur hexafluoride is used in

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Q. The number of valence electrons in trivalent impurity is

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Q. Soft iron is suitable for making temporary magnets.

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Q. Antiferromagnetic materials do not have permanent dipoles.

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Q. The Ohm's law for conduction in metals is

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Q. The measurement of Hall coefficient of a semiconductor with one type of charge carriers gives the information about

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Q. ∈₀ has no other physical meaning than that of a fundamental conversion factor.

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Q. Which of the following is used in temperature alarm circuits?

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Q. n type semiconductors

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Q. The most important primary force of attraction in the formation of solids is

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Q. When two conductors carry currents in the same direction the force is repulsive.

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Q. The number of turns in a coil is doubled. If initial time constant is T, the new time constant is

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

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Q. Iron has a body centred cubic structure.

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Q. The units of polarization of dielectric are

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

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

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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.

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Q. In a metal, the valence electrons

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Q. All magnetic materials exhibit the phenomenon of saturation.

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