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 semiconductor diode?

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

Question # 3

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 # 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

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 # 6

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 # 7

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 # 8

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 # 9

Define current of gain of a transistor

Ans 1: The ratio of output current to input current is called current gain of a transistor.The ratio of collector current to base current is called current gain of a transistor.

Question # 10

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.

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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 semiconductor diode?

What is OP-GATE?

Give any two characteristics of operational amplifier.

Write a note on LED.

Give four application or uses of photodiode?

What is AND Gate?

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

Define current of gain of a transistor

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

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 semiconductor diode?

What is OP-GATE?

Give any two characteristics of operational amplifier.

Write a note on LED.

Give four application or uses of photodiode?

What is AND Gate?

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

Define current of gain of a transistor

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

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

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

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

What do LED and LASER stand for?

How the current flows in forward and reverse biased diode?

Give four application or uses of photodiode?

Define Open Loop gain of operational amplifier.

Explain why an ordinary Silicon diode does not emit light.

What is AND Gate?

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

What is photodiode?Write down its two main applications.

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

Why is the photodiode operated in reverse biased state?

How is the XOR gate so called?

Define Depletion region?

Why the base current is transistor is very small?

Give two applications of gated in control system.

What is semiconductor diode?

What is AND Gate?

What is photovoltaic cell?Discuss its working?

Define logic system and logic gates.

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

ICS Part 2 Physics Chapter 18 Short Questions Preparation

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