ICS Part 2 Physics Chapter 18 Short Questions Preparation

Question # 1

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

Ans 1: The potential difference across the depletion region which acts as a barrier to the flow of charge carriers is called potential barrier.The value of potential barrier for germanium is 0.3V and for silicon is 0.7 V.

Question # 2

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

Ans 1: At the formation of pn-junction ,the free electrons in n-region because of their random motion diffuse into the p-region,.As a result of this diffusion a region is formed around the junction consisting of positive and negative ions,Due to charge on these ions a potential difference develops across the depletion region,This potential difference is called potential barrier,stops further diffusion of electron into the p-region.

Question # 3

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 # 4

What is principle of vital ground?

Ans 1: In an operational amplifier ,if the non inverting terminal is grounded by the concept of virtual ground the inverting terminal is also at ground potential though there is no physical connection between the inverting terminal and the ground,This is the principle of virtual ground.

Question # 5

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 # 6

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 # 7

Why charge carriers are not present in the depletion region?

Ans 1: This is due to the fact when an electron from an n region diffuses into the p-region,it leaves behind a positive ion.When this electron recombines with the hole in the p-region,a negative ion is formed,So no charge carrier are available in this region,though it contains immobile positive and negative ions.

Question # 8

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 # 9

What is semiconductor diode?

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

Question # 10

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.

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

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

Define logic system and logic gates.

What is principle of vital ground?

What is photovoltaic cell?Discuss its working?

How the current flows in forward and reverse biased diode?

Why charge carriers are not present in the depletion region?

What is OP-GATE?

What is semiconductor diode?

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

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

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

Define logic system and logic gates.

What is principle of vital ground?

What is photovoltaic cell?Discuss its working?

How the current flows in forward and reverse biased diode?

Why charge carriers are not present in the depletion region?

What is OP-GATE?

What is semiconductor diode?

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

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

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?

What is principle of vital ground?

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

Why the base current is transistor is very small?

Why is the photodiode operated in reverse biased state?

Give two applications of gated in control system.

What is photovoltaic cell?Discuss its working?

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

Give four application or uses of photodiode?

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

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

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

How the normal operation of transistor is achieved?

Give four application or uses of photodiode?

What is AND Gate?

What do LED and LASER stand for?

What is OP-GATE?

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

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

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