Semiconductor Theory MCQs with Explanations

An n-type semiconductor is a type of semiconductor material in which the majority charge carriers are electrons . These electrons are negatively charged. The term "n-type" stands for "negative type," indicating the predominant charge of the carriers. In an n-type semiconductor, impurities are intentionally added to introduce extra electrons into the crystal lattice, creating an excess of negative charge carriers. This leads to the conductivity of the material being primarily due to the movement of electrons. Option A: Positively charged is not the correct answer as n-type semiconductors have an excess of negatively charged electrons, not positively charged carriers. Option C: Electrically neutral is not the correct answer as n-type semiconductors have an excess of electrons and are not electrically neutral. Option D: None of the above is not the correct answer as the correct answer is Option B: Negatively charged. Given the options provided, the correct answer is Option B: Negatively charged.

Electron-pair bonds is the correct answer to “The strength of a semiconductor crystal comes from”. This question is standard in competitive examination syllabi for Semiconductor Theory.

1 atom for 108 atoms is the correct answer to “The impurity level in an extrinsic semiconductor is about of pure semiconductor.”. This question is standard in competitive examination syllabi for Semiconductor Theory.

Attract each other is the correct answer to “A hole and electron in close proximity would tend to ___________”. This question is standard in competitive examination syllabi for Semiconductor Theory.

5 is the correct answer to “A pentavalent impurity has ___________ Valence electrons”. This question is standard in competitive examination syllabi for Semiconductor Theory.

Ω is the correct answer to “A forward biased pn junction diode has a resistance of the order of”. This question is standard in competitive examination syllabi for Semiconductor Theory.

MΩ is the correct answer to “A reverse biased pn junction has resistance of the order of”. This question is standard in competitive examination syllabi for Semiconductor Theory.

Negative is the correct answer to “A semiconductor has ___________ temperature coefficient of resistance.”. This question is standard in competitive examination syllabi for Semiconductor Theory.

No holes or free electrons is the correct answer to “At absolute temperature, an intrinsic semiconductor has ___________”. This question is standard in competitive examination syllabi for Semiconductor Theory.

An insulator is the correct answer to “At room temperature, an intrinsic silicon crystal acts approximately as”. This question is standard in competitive examination syllabi for Semiconductor Theory.

Unidirectional switch is the correct answer to “A pn junction acts as a ___________”. This question is standard in competitive examination syllabi for Semiconductor Theory.

Free electrons is the correct answer to “Addition of pentavalent impurity to a semiconductor creates many”. This question is standard in competitive examination syllabi for Semiconductor Theory.

Holes is the correct answer to “Addition of trivalent impurity to a semiconductor creates many”. This question is standard in competitive examination syllabi for Semiconductor Theory.

The incomplete part of an electron pair bond is the correct answer to “A hole in a semiconductor is defined as ___________”. This question is standard in competitive examination syllabi for Semiconductor Theory.

Decreases is the correct answer to “With forward bias to a pn junction , the width of depletion layer”. This question is standard in competitive examination syllabi for Semiconductor Theory.

Covalent is the correct answer to “A semiconductor is formed by bonds.”. This question is standard in competitive examination syllabi for Semiconductor Theory.

µA is the correct answer to “The leakage current in a pn junction is of the order of”. This question is standard in competitive examination syllabi for Semiconductor Theory.

Minority carriers is the correct answer to “When the temperature of an extrinsic semiconductor is increased, the pronounced effect is on”. This question is standard in competitive examination syllabi for Semiconductor Theory.

Holes and free electrons is the correct answer to “In a semiconductor, current conduction is due to”. This question is standard in competitive examination syllabi for Semiconductor Theory.

Decreases is the correct answer to “As the doping to a pure semiconductor increases, the bulk resistance of the semiconductor ___________”. This question is standard in competitive examination syllabi for Semiconductor Theory.

n-type semiconductor is the correct answer to “When a pentavalent impurity is added to a pure semiconductor, it becomes”. This question is standard in competitive examination syllabi for Semiconductor Theory.

0.3 V is the correct answer to “The barrier voltage at a pn junction for germanium is about”. This question is standard in competitive examination syllabi for Semiconductor Theory.

Holes and electrons is the correct answer to “In the depletion region of a pn junction, there is a shortage of”. This question is standard in competitive examination syllabi for Semiconductor Theory.

3 is the correct answer to “A trivalent impurity has valence electrons”. This question is standard in competitive examination syllabi for Semiconductor Theory.

Diffusion is the correct answer to “The random motion of holes and free electrons due to thermal agitation is called ___________”. This question is standard in competitive examination syllabi for Semiconductor Theory.

Minority carriers is the correct answer to “The leakage current across a pn junction is due to ___________”. This question is standard in competitive examination syllabi for Semiconductor Theory.

Goes down is the correct answer to “When a pure semiconductor is heated, its resistance ___________”. This question is standard in competitive examination syllabi for Semiconductor Theory.

Almost no current is the correct answer to “A reverse bias pn junction has ___________”. This question is standard in competitive examination syllabi for Semiconductor Theory.

Silicon is the correct answer to “The most commonly used semiconductor is ___________”. This question is standard in competitive examination syllabi for Semiconductor Theory.