Bonding is a germanium crystal (semi-conductor) is

(1) Metallic

(2) Ionic

(3) Vander Waal's type

(4) Covalent

Subtopic:  Types of Semiconductors |
 71%
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A P-type semiconductor can be obtained by adding

(1) Arsenic to pure silicon

(2) Gallium to pure silicon

(3) Antimony to pure germanium

(4) Phosphorous to pure germanium

Subtopic:  Types of Semiconductors |
 82%
From NCERT
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The valence of an impurity added to germanium crystal in order to convert it into a P-type semiconductor is

(1) 6

(2) 5

(3) 4

(4) 3

Subtopic:  Types of Semiconductors |
 85%
From NCERT
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The valency of the impurity atom that is to be added to germanium crystal so as to make it an N-type semiconductor, is
1. 6

2. 5

3. 4

4. 3

Subtopic:  Types of Semiconductors |
 91%
From NCERT
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Silicon is a semiconductor. If a small amount of As is added to it, then its electrical conductivity 

(1) Decreases

(2) Increases

(3) Remains unchanged

(4) Becomes zero

Subtopic:  Types of Semiconductors |
 88%
From NCERT
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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

(1) Resistance of each increases

(2) Resistance of each decreases

(3) Resistance of copper increases while that of germanium decreases

(4) Resistance of copper decreases while that of germanium increases

Subtopic:  Types of Semiconductors |
 65%
From NCERT
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To obtain a P-type Si semiconductor, we need to dope pure Si with 

(1) Aluminium

(2) Phosphorous

(3) Oxygen

(4) Germanium

Subtopic:  Types of Semiconductors |
 82%
From NCERT
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The electrical conductivity of a semiconductor

(1) Decreases with the rise in its temperature

(2) Increases with the rise in its temperature

(3) Does not change with the rise in its temperature

(4) First increases and then decreases with the rise in its temperature

Subtopic:  Types of Semiconductors |
 76%
From NCERT
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When a semiconductor is heated, its resistance

(1) Decreases

(2) Increases

(3) Remains unchanged

(4) Nothing is definite

Subtopic:  Types of Semiconductors |
 83%
From NCERT
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In an insulator, the forbidden energy gap between the valence band and conduction band is of the order of

(1) 1  MeV

(2)  0.1 MeV

(3) 1 eV 

(4) 15 eV

Subtopic:  Energy Band theory |
 63%
From NCERT
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