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 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 # 3

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 # 4

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 # 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

Write a note on LED.

Ans 1: Light emitting diode are made from the special semiconductor such as gallium arsenide and gallium arsenide phosphide in which the potential barrier between p and n side is such that when electrons combines with a hole during forward biased conduction,a photon of visible light is emitted.
LED are used in 7-segment display,small light sources etc.

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

Explain why an ordinary Silicon diode does not emit light.

Ans 1: Ordinary silicon is opaque to light,So it does not emit visible light.It emits infrared light.To emit light ,gallium arsenide or gallium arsenide photodiode are used as semiconductor.

Question # 9

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 # 10

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.

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

How is p-n junction formed?

What is AND Gate?

Give four application or uses of photodiode?

Write a note on LED.

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

Explain why an ordinary Silicon diode does not emit light.

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

How the current flows in forward and reverse biased 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 biasing requirement of the junction of a transistor for its normal operation?

How is p-n junction formed?

What is AND Gate?

Give four application or uses of photodiode?

Write a note on LED.

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

Explain why an ordinary Silicon diode does not emit light.

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

How the current flows in forward and reverse biased diode?

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

Give any two characteristics of operational amplifier.

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

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

What is principle of vital ground?

Differentiate between the forward biased and the reserve biase.

What is OP-GATE?

Give two applications of gated in control system.

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

How the current flows in forward and reverse biased diode?

What is photovoltaic cell?Discuss its working?

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

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

What is photovoltaic cell?Discuss its working?

What is photodiode?Write down its two main applications.

What is semiconductor diode?

Define current of gain of a transistor

Define Depletion region?

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

Why is the photodiode operated in reverse biased state?

How is p-n junction formed?

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

ICS Part 2 Physics Chapter 18 Short Questions Preparation

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