ICS Part 2 Physics Chapter 18 Short Questions Preparation

Question # 1

How is p-n junction formed?

Ans 1: A p-n junction is formed when a crystal of germanium or silicon is grown in such a way that is its one half is doped with a trivalent impurity and the other half with a pentavalent impurity.

Question # 2

Define logic system and logic gates.

Ans 1: A digital system deals with the quantities or variable which have only two discrete values or state.
The electronic circuits which implements the various logic operation are known as logic gates.

Question # 3

Define Depletion region?

Ans 1: A region in a semiconductor device,usually at the junction of p-type and n-type materials ,in which there is neither an excess of electrons nor of holes is called depletion region,It charge less region.

Question # 4

What is the effect of forward biased and reverse biasing of a diode on the width of depletion region?

Ans 1: When forward biased then the width of depletion region decreases and when reverse biased then the width of depletion region increase.

Question # 5

Give two applications of gated in control system.

Ans 1: Gates are widely used in control system.They control the function of the system by monitoring some physical parameters such as temperature ,pressure or some other physical quantity of the system,Sensors are required to operate gates.

Question # 6

Why is the photodiode operated in reverse biased state?

Ans 1: Photodiode is used for the detection of light.So it is used in reverse biased state.Reverse current increase with the intensity of incident light.When no light incidents,then reverse current will be negligible.

Question # 7

What is meant by rectification?

Ans 1: The conversing of alternating current signal into pulsating direct current signal is called rectification.The current for this purpose is called rectifier circuit.

Question # 8

Give any two characteristics of operational amplifier.

Ans 1: Input Resistance: It is the resistance between the + and - input of the amplifier,Whose value is of the order of several mega ohms.
Output resistance:It is the resistance between the output terminal and ground.Its value is only a few ohms.

Question # 9

Why the biasing requirement of the junction of a transistor for its normal operation?

Ans 1: For the normal operation the base emitter junction of transistor is forward biased and collector base junction is reverse biased.

Question # 10

How the current flows in forward and reverse biased diode?

Ans 1: In forward biasing,the external potential difference supplies energy to free electrons in n-region and holes in p-region to overcome the potential barrier,a current of the orderof a few milli-amperes begins to flow across the pn junction.
In reverse biasing ,no current flow due to the majority charge carrier,However a very small current of the order of of few micro amperes flow across the junction due to minority charge carriers.It is also known as reverse current or leakage current.

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ICS Part 2 Physics Chapter 18 Short Questions Preparation

12th Class PhysicsShort Questions Preparation

12th Class Physics Chapter Wise Preparation

Online Short Questions For Chapter 7 "ICS Part 2 Physics Chapter 18 Short Questions Preparation "

Physics - ICS Part 2 Physics Chapter 18 Short Questions Preparation

How is p-n junction formed?

Define logic system and logic gates.

Define Depletion region?

What is the effect of forward biased and reverse biasing of a diode on the width of depletion region?

Give two applications of gated in control system.

Why is the photodiode operated in reverse biased state?

What is meant by rectification?

Give any two characteristics of operational amplifier.

Why the biasing requirement of the junction of a transistor for its normal operation?

How the current flows in forward and reverse biased diode?

Prepare Complete Set Wise Questions For Chapter 7 "ICS Part 2 Physics Chapter 18 Short Questions Preparation "

Set 1

Set 2

Set 3

ICS Part 2 Physics Chapter 18 Short Questions Preparation - Set 1

How is p-n junction formed?

Define logic system and logic gates.

Define Depletion region?

What is the effect of forward biased and reverse biasing of a diode on the width of depletion region?

Give two applications of gated in control system.

Why is the photodiode operated in reverse biased state?

What is meant by rectification?

Give any two characteristics of operational amplifier.

Why the biasing requirement of the junction of a transistor for its normal operation?

How the current flows in forward and reverse biased diode?

ICS Part 2 Physics Chapter 18 Short Questions Preparation - Set 2

What is principle of vital ground?

Give two applications of gated in control system.

Differentiate between the forward biased and the reserve biase.

What is the effect of forward biased and reverse biasing of a diode on the width of depletion region?

Why the biasing requirement of the junction of a transistor for its normal operation?

Define Depletion region?

Give four application or uses of photodiode?

How does the motion of an electron in n type substance differ from the motion of holes in a p type substance?

How is p-n junction formed?

What is the role of potential barrier in a diode?How it is formed in diode?

ICS Part 2 Physics Chapter 18 Short Questions Preparation - Set 3

What is principle of vital ground?

Write a note on LED.

Give two applications of gated in control system.

Give four application or uses of photodiode?

Why is the photodiode operated in reverse biased state?

What is the net charge on a n-type or p-type substance?

What is semiconductor diode?

How the normal operation of transistor is achieved?

Why the base current is transistor is very small?

Why the biasing requirement of the junction of a transistor for its normal operation?

ICS Part 2 Physics Chapter 18 Short Questions Preparation

12th Class Physics
Short Questions Preparation