# NCERT Class 12/MCQ Questions for Class 12 Physics Chapter 14 Semiconductor Electronics: Materials, Devices and Simple Circuits Sample Test,Sample questions

## Question: `A p-type semiconductor is:`

1.negatively charged

2.positively charged

3.uncharged

4.None of the these

1.trivalent

2.covalent

3.bivalent

4.monovalent

## Question: `Crystal diode is:`

1.amplifying device

2.fluctuating device

3. non-linear device

4.linear device

## Question: `Energy bands in solids are a consequence of:`

1.Ohmâ€™s Law

2.Pauliâ€™s exclusion principle

3.Bohrâ€™s theory

4.Heisenbergâ€™s uncertainty principle

1. Ï€/2

2.0

3.Ï€/4

4.Ï€

1.atoms

2.holes

3.electrons

4.protons

1.1

2.3

3.7

4.100

1.V/2

2.V

3.2V

4.None

1.equal

2.unequal

3.infinite

4.zero

## Question: `In semi conductor which are responsible for conduction:`

1.only electron

2.electron and hole both

3.only hole

4.None of the above

## Question: `In semi conductor, at room temperature :`

1.the valence bond is partially empty and the conduction band is partially filled

2.the valence bond is partially empty and the conduction band is partially filled

3. the valence band is completely filled

4.None of the above

## Question: `In the middle of the depletion layer of a reverse biased p-n junction, the:`

1.electric field is zero

2. potential is maximum

3.electric field is maximum

4.potential zero.

1.rectify

2.simplify

3.amplify

4.All the above

## Question: `n reverse biasing:`

1.large amount of current flows

2.no current flows

3.potential barrier across junction increases

4.depletion layer resistance increases

1.1

2.2

3.3

4.4

## Question: `On applying reverse bias to a junction diode, it:`

1.lowers the potential barrier

2. raise the potential barrier

3.increases the majority carrier current

4.increases the minority carrier current

## Question: `On heating, resistance of semiconductors:`

1.decreases

2.increases

3.remains same

4.first increases then decreases

1.amplifier

2.oscillator

3.detector

4.modulator

## Question: `Semiconductors of both p-type and n-type are produced by:`

1.ionic solids

2.covalent solids

3.metallic solids

4.molecular solids

1.copper

2.silicon

3.germanium

4.aluminium

## Question: `The part of a transistor which is heavily doped to produce a large number of majority carriers is :`

1. base

2.emitter

3.collector

4.None of the these

1.n âˆ T

2.n âˆ TÂ²

3.n âˆ T1/2

4.n âˆ T3/2

1.monovalent

2.divalent

3.trivalent

4.pentavalent

1.aluminium

2.phosphorus

3.oxygen

4.germanium

1.5

2.7

3.14

4.16

1.OR

2.NOT

3.AND

4.NAND

## Question: `With fall of temperature, the forbidden energy gap of a semiconductor`

1.increases

2.decreases

3.sometimes increases and sometimes decreases

4.remains unchanged

## Question: `Zener diode is used for:`

1.Zener diode is used for:

2.amplification

3.stabilisation

4.rectification

## More MCQS

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