ICS Part 2 Physics Chapter 18 Short Questions Preparation

Question # 1

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 # 2

What is semiconductor diode?

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

Question # 3

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 # 4

What is meant by rectification?

Ans 1: The conversing of alternating current signal into pulsating direct current signal is called rectification.The current for this purpose is called rectifier circuit.

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

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 # 7

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 # 8

Define Open Loop gain of operational amplifier.

Ans 1: The ratio of output voltage to voltage difference between non -inverting and inverting inputs ,when there is no external connection between the input and output is called open loop gain of operational amplifier.

Question # 9

Why the base current is transistor is very small?

Ans 1: Base is very thin so a number of electrons attracted by collector and very few enter into the base.And base current is very small.

Question # 10

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.

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

What is semiconductor diode?

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

What is meant by rectification?

How the current flows in forward and reverse biased diode?

How is p-n junction formed?

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

Define Open Loop gain of operational amplifier.

Why the base current is transistor is very small?

Differentiate between the forward biased and the reserve biase.

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

What is semiconductor diode?

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

What is meant by rectification?

How the current flows in forward and reverse biased diode?

How is p-n junction formed?

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

Define Open Loop gain of operational amplifier.

Why the base current is transistor is very small?

Differentiate between the forward biased and the reserve biase.

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

What is photodiode?Write down its two main applications.

Explain why an ordinary Silicon diode does not emit light.

What is OP-GATE?

Give any two characteristics of operational amplifier.

How the normal operation of transistor is achieved?

What is principle of vital ground?

What is photovoltaic cell?Discuss its working?

Give four application or uses of photodiode?

Define logic system and logic gates.

How is the XOR gate so called?

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

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

Give two applications of gated in control system.

Define Open Loop gain of operational amplifier.

Define current of gain of a transistor

Why the base current is transistor is very small?

Define Depletion region?

How the current flows in forward and reverse biased diode?

Define logic system and logic gates.

Give any two characteristics of operational amplifier.

Explain why an ordinary Silicon diode does not emit light.

ICS Part 2 Physics Chapter 18 Short Questions Preparation

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