ICS Part 2 Physics Chapter 18 Short Questions Preparation

Question # 1

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

Ans 1: Yes when anode is 0.2V positive with respect to cathode,it is forward biased.But the value of potential barrier for germanium is 0.3 V and for silicon is 0.7 V.Therefore there will be no conduction of current.

Question # 2

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 # 3

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 # 4

What is photodiode?Write down its two main applications.

Ans 1: Photodiode is used for the detection of light.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 negligble.It is used as
1. Detection of both visible and and invisible radiations
2. Automatic switching

Question # 5

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 # 6

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 # 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

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 # 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

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.

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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

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

Differentiate between the forward biased and the reserve biase.

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

What is photodiode?Write down its two main applications.

Explain why an ordinary Silicon diode does not emit light.

Why the base current is transistor is very small?

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

How the normal operation of transistor is achieved?

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

How is the XOR gate so called?

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

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

Differentiate between the forward biased and the reserve biase.

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

What is photodiode?Write down its two main applications.

Explain why an ordinary Silicon diode does not emit light.

Why the base current is transistor is very small?

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

How the normal operation of transistor is achieved?

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

How is the XOR gate so called?

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

What is AND Gate?

What do LED and LASER stand for?

What is semiconductor diode?

Give two applications of gated in control system.

Why charge carriers are not present in the depletion region?

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 is photodiode?Write down its two main applications.

Write a note on LED.

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

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

Give any two characteristics of operational amplifier.

Differentiate between the forward biased and the reserve biase.

Explain why an ordinary Silicon diode does not emit light.

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

How the normal operation of transistor is achieved?

What is semiconductor diode?

Define Open Loop gain of operational amplifier.

How is the XOR gate so called?

Why is the photodiode operated in reverse biased state?

What is photodiode?Write down its two main applications.

ICS Part 2 Physics Chapter 18 Short Questions Preparation

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