ICS Part 2 Physics Chapter 18 Short Questions Preparation

Question # 1

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 # 2

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 # 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

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 # 5

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 # 6

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 # 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

Explain why an ordinary Silicon diode does not emit light.

Ans 1: Ordinary silicon is opaque to light,So it does not emit visible light.It emits infrared light.To emit light ,gallium arsenide or gallium arsenide photodiode are used as semiconductor.

Question # 9

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 # 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

Give any two characteristics of operational amplifier.

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

What is OP-GATE?

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

How the current flows in forward and reverse biased diode?

Why charge carriers are not present in the depletion region?

Give two applications of gated in control system.

Explain why an ordinary Silicon diode does not emit light.

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

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

Give any two characteristics of operational amplifier.

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

What is OP-GATE?

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

How the current flows in forward and reverse biased diode?

Why charge carriers are not present in the depletion region?

Give two applications of gated in control system.

Explain why an ordinary Silicon diode does not emit light.

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

What is principle of vital ground?

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

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

Give two applications of gated in control system.

Why the base current is transistor is very small?

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

What is principle of vital ground?

What is AND Gate?

Why is the photodiode operated in reverse biased state?

Define Depletion region?

How the current flows in forward and reverse biased diode?

How is the XOR gate so called?

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

How the normal operation of transistor is achieved?

What is AND Gate?

Write a note on LED.

Explain why an ordinary Silicon diode does not emit light.

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?

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

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

Give any two characteristics of operational amplifier.

How is p-n junction formed?

ICS Part 2 Physics Chapter 18 Short Questions Preparation

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