Let nP and ne be the number of holes and conduction electrons respectively in a semiconductor. Then

(1) nP>ne in an intrinsic semiconductor

(2) nP=ne in an extrinsic semiconductor

(3) nP=ne in an intrinsic semiconductor

(4) ne<nP in an intrinsic semiconductor

Subtopic:  Types of Semiconductors |
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Wires P and Q have the same resistance at ordinary (room) temperature. When heated, resistance of P increases and that of Q decreases. We conclude that

1. P and Q are conductors of different materials

2. P is N-type semiconductor and Q is P-type semiconductor

3. P is semiconductor and Q is conductor

4. P is conductor and Q is semiconductor

Subtopic:  Types of Semiconductors |
 80%
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In extrinsic P and N-type, semiconductor materials, the ratio of the impurity atoms to the pure semiconductor atoms is about 
(1) 1                   

(2) 10-1

(3) 10-4             

(4) 10-7

Subtopic:  Types of Semiconductors |
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How much is the forbidden gap (approximately) in the energy bands of germanium at room temperature? 
1. \(1.1~\text{eV}\)
2. \(0.1~\text{eV}\)
3. \(0.67~\text{eV}\)
4. \(6.7~\text{eV}\)

Subtopic:  Energy Band theory |
 60%
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In P-type semiconductor, the majority and minority charge carriers are respectively

(1) Protons and electrons

(2) Electrons and protons

(3) Electrons and holes

(4) Holes and electrons

Subtopic:  Types of Semiconductors |
 89%
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At zero Kelvin a piece of germanium

(1) Becomes semiconductor

(2) Becomes good conductor

(3) Becomes bad conductor

(4) Has maximum conductivity

Subtopic:  Types of Semiconductors |
 72%
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A semiconductor is cooled from T1K to T2K. Its resistance

(1) Will decrease

(3) Will increase

(3) Will first decrease and then increase

(4) Will not change

Subtopic:  Types of Semiconductors |
 76%
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In intrinsic semiconductor at room temperature, the number of electrons and holes are

(1) Equal

(2) Zero

(3) Unequal

(4) Infinite

Subtopic:  Types of Semiconductors |
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In a semiconductor, the separation between the conduction band and valence band is of the order of

(1) 100 eV

(2) 10 eV

(3) 1 eV

(4) 0 eV

Subtopic:  Energy Band theory |
 77%
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The intrinsic semiconductor becomes an insulator at

(1) 0°C

(2) -100°C 

(3)  300 K

(4) 0 K

Subtopic:  Types of Semiconductors |
 76%
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