ICS Part 2 Physics Chapter 18 Short Questions Preparation

Question # 1

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 # 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 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

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

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

Ans 1: Yes when anode is 0.2V positive with respect to cathode,it is forward biased.But the value of potential barrier for germanium is 0.3 V and for silicon is 0.7 V.Therefore there will be no conduction of current.

Question # 6

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 # 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

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

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 # 10

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.

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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

Why is the photodiode operated in reverse biased state?

Differentiate between the forward biased and the reserve biase.

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

What is photodiode?Write down its two main applications.

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

Give any two characteristics of operational amplifier.

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

What is AND Gate?

How is p-n junction formed?

Why the base current is transistor is very small?

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 is the photodiode operated in reverse biased state?

Differentiate between the forward biased and the reserve biase.

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

What is photodiode?Write down its two main applications.

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

Give any two characteristics of operational amplifier.

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

What is AND Gate?

How is p-n junction formed?

Why the base current is transistor is very small?

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

How the normal operation of transistor is achieved?

Give any two characteristics of operational amplifier.

How is the XOR gate so called?

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

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

Define current of gain of a transistor

Explain why an ordinary Silicon diode does not emit light.

Define Depletion region?

Give four application or uses of photodiode?

Give two applications of gated in control system.

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

Write a note on LED.

Define Depletion region?

How the normal operation of transistor is achieved?

Define Open Loop gain of operational amplifier.

What is OP-GATE?

What do LED and LASER stand for?

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

What is photodiode?Write down its two main applications.

How is p-n junction formed?

What is principle of vital ground?

ICS Part 2 Physics Chapter 18 Short Questions Preparation

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