ICS Part 2 Physics Chapter 18 Short Questions Preparation

Question # 1

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 # 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

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 # 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

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 # 6

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 # 7

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 # 8

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 # 9

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 # 10

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.

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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

How the current flows in forward and reverse biased diode?

What is OP-GATE?

Write a note on LED.

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

What is photodiode?Write down its two main applications.

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.

Why the base current is transistor is very small?

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

What is meant by rectification?

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

How the current flows in forward and reverse biased diode?

What is OP-GATE?

Write a note on LED.

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

What is photodiode?Write down its two main applications.

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.

Why the base current is transistor is very small?

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

What is meant by rectification?

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

Define current of gain of a transistor

Why is the photodiode operated in reverse biased state?

How is p-n junction formed?

Give two applications of gated in control system.

Why the base current is transistor is very small?

Give four application or uses of photodiode?

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

What is photovoltaic cell?Discuss its working?

What is photodiode?Write down its two main applications.

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

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

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

How is the XOR gate so called?

How the normal operation of transistor is achieved?

What is OP-GATE?

Give two applications of gated in control system.

Write a note on LED.

What is meant by rectification?

Define Depletion region?

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

What is AND Gate?

ICS Part 2 Physics Chapter 18 Short Questions Preparation

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