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 |
 89%
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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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In a good conductor, the energy gap between the conduction band and the valence band is:
1. Infinite
2. Wide
3. Narrow
4. Zero

Subtopic:  Energy Band theory |
 77%
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The impurity atom added to germanium to make it an N-type semiconductor is 

(1) Arsenic

(2) Iridium

(3) Aluminium

(4) Iodine

Subtopic:  Types of Semiconductors |
 88%
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