ICS Part 2 Physics Chapter 18 Short Questions Preparation

Question # 1

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 # 2

What is semiconductor diode?

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

Question # 3

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 # 4

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 # 5

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 # 6

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 # 7

How is the XOR gate so called?

Ans 1: One of its most commonly used applications is as a basic logic comparator which produce a logic "1" output when its two inputs bits are not equal.Because of the ,the XOR gate has an inequality status being known as an odd functions.

Question # 8

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 # 9

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

Ans 1: Since they are electrically neutral substance,So the net charge on them is zero.

Question # 10

Define Depletion region?

Ans 1: A region in a semiconductor device,usually at the junction of p-type and n-type materials ,in which there is neither an excess of electrons nor of holes is called depletion region,It charge less region.

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

What is semiconductor diode?

What is principle of vital ground?

How the current flows in forward and reverse biased diode?

Give any two characteristics of operational amplifier.

Differentiate between the forward biased and the reserve biase.

How is the XOR gate so called?

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

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

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

What is semiconductor diode?

What is principle of vital ground?

How the current flows in forward and reverse biased diode?

Give any two characteristics of operational amplifier.

Differentiate between the forward biased and the reserve biase.

How is the XOR gate so called?

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

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

Define Depletion region?

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?

Differentiate between the forward biased and the reserve biase.

What do LED and LASER stand for?

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

How the current flows in forward and reverse biased diode?

Define Open Loop gain of operational amplifier.

Write a note on LED.

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

How is p-n junction formed?

Define logic system and logic gates.

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

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

What is semiconductor diode?

Define Open Loop gain of operational amplifier.

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

How the normal operation of transistor is achieved?

What do LED and LASER stand for?

What is photodiode?Write down its two main applications.

Why the base current is transistor is very small?

Give four application or uses of photodiode?

Why is the photodiode operated in reverse biased state?

ICS Part 2 Physics Chapter 18 Short Questions Preparation

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