ICS Part 2 Physics Chapter 18 Short Questions Preparation

Question # 1

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 # 2

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 # 3

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 # 4

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 # 5

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 # 6

Why is the photodiode operated in reverse biased state?

Ans 1: Photodiode is used for the detection of light.So it is used in reverse biased state.Reverse current increase with the intensity of incident light.When no light incidents,then reverse current will be negligible.

Question # 7

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 # 8

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 # 9

Write a note on LED.

Ans 1: Light emitting diode are made from the special semiconductor such as gallium arsenide and gallium arsenide phosphide in which the potential barrier between p and n side is such that when electrons combines with a hole during forward biased conduction,a photon of visible light is emitted.
LED are used in 7-segment display,small light sources etc.

Question # 10

What is semiconductor diode?

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

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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

Differentiate between the forward biased and the reserve biase.

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

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

Define current of gain of a transistor

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

Why is the photodiode operated in reverse biased state?

How the current flows in forward and reverse biased diode?

Give two applications of gated in control system.

Write a note on LED.

What is semiconductor diode?

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

Differentiate between the forward biased and the reserve biase.

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

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

Define current of gain of a transistor

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

Why is the photodiode operated in reverse biased state?

How the current flows in forward and reverse biased diode?

Give two applications of gated in control system.

Write a note on LED.

What is semiconductor diode?

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

Define logic system and logic gates.

Give two applications of gated in control system.

Write a note on LED.

Explain why an ordinary Silicon diode does not emit light.

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

How is the XOR gate so called?

What is semiconductor diode?

Define Depletion region?

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

How the normal operation of transistor is achieved?

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

Define logic system and logic gates.

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

Why is the photodiode operated in reverse biased state?

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?

Why charge carriers are not present in the depletion region?

What is meant by rectification?

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

What do LED and LASER stand for?

Give any two characteristics of operational amplifier.

ICS Part 2 Physics Chapter 18 Short Questions Preparation

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