ICS Part 2 Physics Chapter 18 Short Questions Preparation

Question # 1

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 # 2

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 # 3

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 # 4

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 # 5

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 # 6

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

Ans 1: For the normal operation the base emitter junction of transistor is forward biased and collector base junction is reverse biased.

Question # 7

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 # 8

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 # 9

What is photovoltaic cell?Discuss its working?

Ans 1: It consists of a thick n type region covered by a thin p-layer type.When exposed to light,it absorbs photon which generated electron-hole pairs.The electric field at the junction moves electron and holes and a current flow through the external circuit.And this current is directly proportional to the intensity of light.

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

Differentiate between the forward biased and the reserve biase.

What is OP-GATE?

How the current flows in forward and reverse biased diode?

Give any two characteristics of operational amplifier.

Give four application or uses of photodiode?

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

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 photovoltaic cell?Discuss its working?

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

Differentiate between the forward biased and the reserve biase.

What is OP-GATE?

How the current flows in forward and reverse biased diode?

Give any two characteristics of operational amplifier.

Give four application or uses of photodiode?

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

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 photovoltaic cell?Discuss its working?

Why the base current is transistor is very small?

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

Give any two characteristics of operational amplifier.

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

What is semiconductor diode?

Define Depletion region?

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

Differentiate between the forward biased and the reserve biase.

How the normal operation of transistor is achieved?

How is p-n junction formed?

Give two applications of gated in control system.

Explain why an ordinary Silicon diode does not emit light.

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

What do LED and LASER stand for?

Why is the photodiode operated in reverse biased state?

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

What is photovoltaic cell?Discuss its working?

What is principle of vital ground?

What is semiconductor diode?

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

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

How the current flows in forward and reverse biased diode?

Why charge carriers are not present in the depletion region?

ICS Part 2 Physics Chapter 18 Short Questions Preparation

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