ICS Part 2 Physics Chapter 18 Short Questions Preparation

Question # 1

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 # 2

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 # 3

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 # 4

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 # 5

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 # 6

What is semiconductor diode?

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

Question # 7

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 # 8

What do LED and LASER stand for?

Ans 1: LED stands for light emitting diode..
Laser stands for light amplification stimulated emission radiation .

Question # 9

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 # 10

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.

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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

Give any two characteristics of operational amplifier.

What is AND Gate?

What is photovoltaic cell?Discuss its working?

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

How the current flows in forward and reverse biased diode?

What is semiconductor diode?

Define Depletion region?

What do LED and LASER stand for?

Why the base current is transistor is very small?

Differentiate between the forward biased and the reserve biase.

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

Give any two characteristics of operational amplifier.

What is AND Gate?

What is photovoltaic cell?Discuss its working?

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

How the current flows in forward and reverse biased diode?

What is semiconductor diode?

Define Depletion region?

What do LED and LASER stand for?

Why the base current is transistor is very small?

Differentiate between the forward biased and the reserve biase.

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

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

What is OP-GATE?

Give four application or uses of photodiode?

What is principle of vital ground?

How is p-n junction formed?

How the current flows in forward and reverse biased diode?

Define current of gain of a transistor

Define logic system and logic gates.

Why is the photodiode operated in reverse biased state?

Give two applications of gated in control system.

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

What is semiconductor diode?

What is principle of vital ground?

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

What is meant by rectification?

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

What is photovoltaic cell?Discuss its working?

What is OP-GATE?

How the normal operation of transistor is achieved?

How the current flows in forward and reverse biased diode?

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

ICS Part 2 Physics Chapter 18 Short Questions Preparation

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