ICS Part 2 Physics Chapter 18 Short Questions Preparation

Question # 1

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 # 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

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.

Question # 4

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 # 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

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 # 7

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.

Question # 8

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 # 9

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 # 10

What is semiconductor diode?

Ans 1: p-n junction is called semiconductor diode.

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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

Define Depletion region?

Why the base current is transistor is very small?

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

Why charge carriers are not present in the depletion region?

What is photodiode?Write down its two main applications.

Differentiate between the forward biased and the reserve biase.

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

How is the XOR gate so called?

What is meant by rectification?

What is semiconductor 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

Define Depletion region?

Why the base current is transistor is very small?

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

Why charge carriers are not present in the depletion region?

What is photodiode?Write down its two main applications.

Differentiate between the forward biased and the reserve biase.

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

How is the XOR gate so called?

What is meant by rectification?

What is semiconductor diode?

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

Explain why an ordinary Silicon diode does not emit light.

How the current flows in forward and reverse biased diode?

Why charge carriers are not present in the depletion region?

Define logic system and logic gates.

What is AND Gate?

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

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

Why is the photodiode operated in reverse biased state?

How is p-n junction formed?

What is photodiode?Write down its two main applications.

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

Write a note on LED.

Why is the photodiode operated in reverse biased state?

Give any two characteristics of operational amplifier.

What is semiconductor diode?

What is OP-GATE?

What do LED and LASER stand for?

Why charge carriers are not present in the depletion region?

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

Explain why an ordinary Silicon diode does not emit light.

The anode of a diode is 0.2V positive with respect to the cathode,It it forward biased?

ICS Part 2 Physics Chapter 18 Short Questions Preparation

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