ICS Part 2 Physics Chapter 18 Short Questions Preparation

Question # 1

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

Ans 1: The potential difference across the depletion region which acts as a barrier to the flow of charge carriers is called potential barrier.The value of potential barrier for germanium is 0.3V and for silicon is 0.7 V.

Question # 2

Why the base current is transistor is very small?

Ans 1: Base is very thin so a number of electrons attracted by collector and very few enter into the base.And base current is very small.

Question # 3

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 # 4

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 # 5

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 # 6

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 # 7

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 # 8

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 # 9

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 # 10

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

Ans 1: Since they are electrically neutral substance,So the net charge on them is zero.

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ICS Part 2 Physics Chapter 18 Short Questions Preparation

12th Class PhysicsShort Questions Preparation

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

Why the base current is transistor is very small?

How is the XOR gate so called?

What is photodiode?Write down its two main applications.

Give any two characteristics of operational amplifier.

How is p-n junction formed?

Differentiate between the forward biased and the reserve biase.

What is meant by rectification?

Why charge carriers are not present in the depletion region?

What is the net charge on a n-type or 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 potential barrier?What is the value of potential barrier of SI and Ge?

Why the base current is transistor is very small?

How is the XOR gate so called?

What is photodiode?Write down its two main applications.

Give any two characteristics of operational amplifier.

How is p-n junction formed?

Differentiate between the forward biased and the reserve biase.

What is meant by rectification?

Why charge carriers are not present in the depletion region?

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

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

What is meant by rectification?

Why is the photodiode operated in reverse biased state?

How the normal operation of transistor is achieved?

What do LED and LASER stand for?

Give two applications of gated in control system.

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

What is photodiode?Write down its two main applications.

How the current flows in forward and reverse biased diode?

How is the XOR gate so called?

What is principle of vital ground?

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

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

What is photodiode?Write down its two main applications.

What is OP-GATE?

Why the base current is transistor is very small?

Differentiate between the forward biased and the reserve biase.

Why is the photodiode operated in reverse biased state?

Explain why an ordinary Silicon diode does not emit light.

Define logic system and logic gates.

Write a note on LED.

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

ICS Part 2 Physics Chapter 18 Short Questions Preparation

12th Class Physics
Short Questions Preparation