ICS Part 2 Physics Chapter 18 Short Questions Preparation

Question # 1

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 # 2

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 # 3

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 # 4

Give two applications of gated in control system.

Ans 1: Gates are widely used in control system.They control the function of the system by monitoring some physical parameters such as temperature ,pressure or some other physical quantity of the system,Sensors are required to operate gates.

Question # 5

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 # 6

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 # 7

Define logic system and logic gates.

Ans 1: A digital system deals with the quantities or variable which have only two discrete values or state.
The electronic circuits which implements the various logic operation are known as logic gates.

Question # 8

What is semiconductor diode?

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

Question # 9

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 # 10

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.

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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

What is photovoltaic cell?Discuss its working?

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

Differentiate between the forward biased and the reserve biase.

Give two applications of gated in control system.

What is meant by rectification?

What is photodiode?Write down its two main applications.

Define logic system and logic gates.

What is semiconductor diode?

How the current flows in forward and reverse biased diode?

Explain why an ordinary Silicon diode does not emit light.

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

What is photovoltaic cell?Discuss its working?

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

Differentiate between the forward biased and the reserve biase.

Give two applications of gated in control system.

What is meant by rectification?

What is photodiode?Write down its two main applications.

Define logic system and logic gates.

What is semiconductor diode?

How the current flows in forward and reverse biased diode?

Explain why an ordinary Silicon diode does not emit light.

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

How the current flows in forward and reverse biased diode?

Give any two characteristics of operational amplifier.

Why the base current is transistor is very small?

How is p-n junction formed?

Why charge carriers are not present in the depletion region?

What is semiconductor diode?

Define logic system and logic gates.

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

Give two applications of gated in control system.

How the normal operation of transistor is achieved?

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

Explain why an ordinary Silicon diode does not emit light.

Differentiate between the forward biased and the reserve biase.

Define current of gain of a transistor

What is photovoltaic cell?Discuss its working?

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

What is meant by rectification?

Why the base current is transistor is very small?

What is semiconductor diode?

What is principle of vital ground?

What do LED and LASER stand for?

ICS Part 2 Physics Chapter 18 Short Questions Preparation

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