ICS Part 2 Physics Chapter 18 Short Questions Preparation

Question # 1

Why charge carriers are not present in the depletion region?

Ans 1: This is due to the fact when an electron from an n region diffuses into the p-region,it leaves behind a positive ion.When this electron recombines with the hole in the p-region,a negative ion is formed,So no charge carrier are available in this region,though it contains immobile positive and negative ions.

Question # 2

Differentiate between the forward biased and the reserve biase.

Ans 1: When p side is positive and n-side is negative,the diode is forward biased.The width of depletion region reduces to which more current is allowed to flow across the junction.The forward resistance is few ohms.
Ans 2: When p side is negative and n side is positive,the diode is reserved biased.The width of depletion region is increased and a very small current flows across the junction due to flow of minority charges carriers,The resistance offered by the diode is several mega ohms.

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

Define current of gain of a transistor

Ans 1: The ratio of output current to input current is called current gain of a transistor.The ratio of collector current to base current is called current gain of a transistor.

Question # 5

What is photodiode?Write down its two main applications.

Ans 1: Photodiode is used for the detection of light.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 negligble.It is used as
1. Detection of both visible and and invisible radiations
2. Automatic switching

Question # 6

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 # 7

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 # 8

What is AND Gate?

Ans 1: It is a logic gate that implements the truth table of AND operations.It has two or more input and single output.

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

What is principle of vital ground?

Ans 1: In an operational amplifier ,if the non inverting terminal is grounded by the concept of virtual ground the inverting terminal is also at ground potential though there is no physical connection between the inverting terminal and the ground,This is the principle of virtual ground.

Latest Educational News Stories

Pakistan's Largest Database of Colleges and Universities

BS Programs

University Past Papers

University Results

Exam Results 2024

Study Abroad Programs and Opportunities for Pakistani Students

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

Why charge carriers are not present in the depletion region?

Differentiate between the forward biased and the reserve biase.

What is OP-GATE?

Define current of gain of a transistor

What is photodiode?Write down its two main applications.

Give four application or uses of photodiode?

Define logic system and logic gates.

What is AND Gate?

What do LED and LASER stand for?

What is principle of vital ground?

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

Why charge carriers are not present in the depletion region?

Differentiate between the forward biased and the reserve biase.

What is OP-GATE?

Define current of gain of a transistor

What is photodiode?Write down its two main applications.

Give four application or uses of photodiode?

Define logic system and logic gates.

What is AND Gate?

What do LED and LASER stand for?

What is principle of vital ground?

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

Give four application or uses of photodiode?

Give any two characteristics of operational amplifier.

What is AND Gate?

What is photodiode?Write down its two main applications.

What do LED and LASER stand for?

Why is the photodiode operated in reverse biased state?

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?

What is meant by rectification?

What is photovoltaic cell?Discuss its working?

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

What is meant by rectification?

Define Depletion region?

What is the potential barrier?What is the value of potential barrier of SI and Ge?

How the normal operation of transistor is achieved?

Define Open Loop gain of operational amplifier.

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

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

Why the base current is transistor is very small?

Write a note on LED.

How the current flows in forward and reverse biased diode?

ICS Part 2 Physics Chapter 18 Short Questions Preparation

12th Class Physics
Short Questions Preparation