An N-type semiconductor is

(1) Negatively charged

(2) Positively charged

(3) Neutral

(4) None of these

Subtopic:  Types of Semiconductors |
 63%
From NCERT
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The energy band gap of Si is

(1) 0.70 eV

(2) 1.1 eV

(3) Between 0.70 eV to 1.1 eV

(4) 5 eV

Subtopic:  Energy Band theory |
 55%
From NCERT
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The forbidden energy bandgap in conductors, semiconductors, and insulators are EG1,EG2 and EG3 and respectively. The relation among them is

(1) EG1=EG2 =EG3

(2) EG1<EG2 <EG3

(3) EG1>EG2 >EG3 

(4) EG1<EG2 >EG3

Subtopic:  Energy Band theory |
 90%
From NCERT
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When Ge crystals are doped with phosphorus atom, then it becomes 

(1) Insulator

(2) P-type

(3) N-type

(4) Superconductor

Subtopic:  Types of Semiconductors |
 87%
From NCERT
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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 |
 84%
From NCERT
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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%
From NCERT
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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 |
From NCERT
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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%
From NCERT
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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%
From NCERT
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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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