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Physics Fsc Part 2 Chapter 7 Online Test MCQs With Answers

Question # 1

A light emitting diode emits light only when

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Reverse biased

Forward biased

Unbiased

None of these

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Question # 2

In case of reverse biasing, current is flown due to:

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Minority charge carriers

Majority charge carriers

Electrons

Protons

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Question # 3

Conversation of only one half of A.C. into D.C. is called.

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Half wave amplification

Wave amplification

Half wave electrification

Half wave rectification

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Question # 4

In an N-type silicon, which of the following statement is true?

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Electrons are majority carriers & trivalent atoms are the dopants

Electrons are majority carriers & pentavalent atoms are the dopants

Holes are minority carriers & pentavalent atoms are the dopants.

Holes are minority carriers & trivavalent atoms are the dopants.

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Question # 5

A PN junction can not be sued a.

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Rectifier

Amplifier

Detector

LED

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Question # 6

The P.D develop in case of germanium is:

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0.3

0.7

0.5

0.9

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Question # 7

Which device is used as a rectifier?

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Capacitor

Transistor

Diode

Transformer

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Question # 8

The average gap for Germanium at 0K is

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1.12 ev

0.02 ev

6.72 ev

7.2 ev

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Question # 9

X=A+B is the mathematical notation for.

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OR gate

NOR gate

NAND gate

AND gate

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