ICS Part 2 Physics Chapter 18 Short Questions Preparation

Question # 1

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 # 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

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 # 4

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 # 5

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 # 6

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 # 7

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 # 8

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 # 9

How the normal operation of transistor is achieved?

Ans 1: For the normal operation the base emitter junction of transistor is forward biased and collector base junction is reverse.
In a common emitter amplifier ,input signal is applied between base and emitter and output signal is taken across collector and emitter,Similarly emitter base junction is forward biased and collector base junction is reverse biased.

Question # 10

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.

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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 AND Gate?

What is OP-GATE?

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?

How is p-n junction formed?

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

Define current of gain of a transistor

How the current flows in forward and reverse biased diode?

How the normal operation of transistor is achieved?

What is principle of vital ground?

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 AND Gate?

What is OP-GATE?

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?

How is p-n junction formed?

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

Define current of gain of a transistor

How the current flows in forward and reverse biased diode?

How the normal operation of transistor is achieved?

What is principle of vital ground?

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

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

Write a note on LED.

What do LED and LASER stand for?

What is OP-GATE?

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

Give two applications of gated in control system.

Define current of gain of a transistor

What is AND Gate?

How the current flows in forward and reverse biased diode?

Why is the photodiode operated in reverse biased state?

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

Differentiate between the forward biased and the reserve biase.

What is principle of vital ground?

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

What is OP-GATE?

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?

Write a note on LED.

How the current flows in forward and reverse biased diode?

What is meant by rectification?

Define logic system and logic gates.

ICS Part 2 Physics Chapter 18 Short Questions Preparation

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