ICS Part 2 Physics Chapter 18 Short Questions Preparation

Question # 1

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

Ans 1: At the formation of pn-junction ,the free electrons in n-region because of their random motion diffuse into the p-region,.As a result of this diffusion a region is formed around the junction consisting of positive and negative ions,Due to charge on these ions a potential difference develops across the depletion region,This potential difference is called potential barrier,stops further diffusion of electron into the p-region.

Question # 2

Give four application or uses of photodiode?

Ans 1: It is used as
1. Detection of both visible and invisible radiations.
2. Logic circuits
3. Automatic switching
4. Optical communication equipment

Question # 3

What is OP-GATE?

Ans 1: OR-GATE implements the logic of OR operation.It has two or more inputs and a single output.Its output will be zero only when all the inputs are zero.

Question # 4

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.

Question # 5

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 # 6

How is the XOR gate so called?

Ans 1: One of its most commonly used applications is as a basic logic comparator which produce a logic "1" output when its two inputs bits are not equal.Because of the ,the XOR gate has an inequality status being known as an odd functions.

Question # 7

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 # 8

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 # 9

What do LED and LASER stand for?

Ans 1: LED stands for light emitting diode..
Laser stands for light amplification stimulated emission radiation .

Question # 10

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

Ans 1: more mobile and rapid than holes in p-type substance because electrons do not require holes for their motions but p-type substance because electrons do not require holes for their motion but hole depend upon electrons for their motion,Both move in opposite direction.

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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

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

Give four application or uses of photodiode?

What is OP-GATE?

How the current flows in forward and reverse biased diode?

Define logic system and logic gates.

How is the XOR gate so called?

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.

What do LED and LASER stand for?

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

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

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

Give four application or uses of photodiode?

What is OP-GATE?

How the current flows in forward and reverse biased diode?

Define logic system and logic gates.

How is the XOR gate so called?

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.

What do LED and LASER stand for?

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

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

What is photodiode?Write down its two main applications.

Write a note on LED.

How is p-n junction formed?

Define current of gain of a transistor

Define Open Loop gain of operational amplifier.

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

Give two applications of gated in control system.

Define logic system and logic gates.

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

How the current flows in forward and reverse biased diode?

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

Give four application or uses of photodiode?

Why the base current is transistor is very small?

Explain why an ordinary Silicon diode does not emit light.

Differentiate between the forward biased and the reserve biase.

Define Depletion region?

What do LED and LASER stand for?

Define current of gain of a transistor

Define Open Loop gain of operational amplifier.

What is AND Gate?

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

ICS Part 2 Physics Chapter 18 Short Questions Preparation

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