Q. A sample of N type semiconductor has an electron density of 6.25 x 10¹⁸/cm³ at 300 K. If intrinsic concentration of carriers in this sample is 2.5 x 10¹³/cm³ at this temperature, the hole density is

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Q. Assertion (A): In a conductor, current density remains constant in time as long as E is constant.

Reason (R): In a conductor, J = σE.

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Q. Hysteresis curve is associated with motion of domain walls.

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Q. The number of protons in germanium atom is

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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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