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Semiconductor Electronics: Materials, Devices and Simple Circuits MCQs for NEET — Physics Questions with Answers

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The ionic bond is absent in

NaCl

CsCl

LiF

H₂O

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Explanation

(d) In H₂O covalent bonding is present.

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A P-type semiconductor can be obtained by adding

Arsenic to pure silicon

Gallium to pure silicon

Antimony to pure germanium

Phosphorous to pure germanium

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Explanation

(b) Ga has a valancy of 3.

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The valence of an impurity added to germanium crystal in order to convert it into a P-type semi conductor is

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In a semiconductor, the concentration of electrons is $8 \times 10^{14} {cm}^{3}$ and that of the holes is $5 \times 10^{12} {cm}^{3}$ . The semiconductor is

P-type

N-type

Intrinsic

PNP-type

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Explanation

(b) Since $n_{e} / n_{h}$ ; the semiconductor is N-type.

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The valency of the impurity atom that is to be added to germanium crystal so as to make it a N-type semiconductor, is

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Explanation

To make germanium a N-type semiconductor, we need to introduce a pentavalent impurity atom, such as antimony (Sb), arsenic (As), or phosphorus (P). These impurity atoms have five valence electrons, one more than germanium's four. This extra electron is weakly bound and can move freely, contributing to electrical conductivity.

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Silicon is a semiconductor. If a small amount of As is added to it, then its electrical conductivity

Decreases

Increases

Remains unchanged

Becomes zero

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Explanation

(b) Impurity increases the conductivity.

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A piece of copper and the other of germanium are cooled from the room temperature to 80 K, then which of the following would be a correct statement

Resistance of each increases

Resistance of each decreases

Resistance of copper increases while that of germanium decreases

Resistance of copper decreases while that of germanium increases

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Explanation

(d) Resistance of conductors (Cu) decreases with decrease in temperature while that of semi-conductors (Ge) increases with decrease in temperature.

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To obtain P-type Si semiconductor, we need to dope pure Si with

Aluminium

Phosphorous

Oxygen

Germanium

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Explanation

(a) Aluminum is trivalent impurity

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Electrical conductivity of a semiconductor

Decreases with the rise in its temperature

Increases with the rise in its temperature

Does not change with the rise in its temperature

First increases and then decreases with the rise in its temperature

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Explanation

(b) With temperature rise conductivity of semiconductors increases.

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When a semiconductor is heated, its resistance

Decreases

Increases

Remains unchanged

Nothing is definite

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Explanation

(a) With temperature rise conductivity of semiconductors increases

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