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

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 # 3

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 # 4

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 # 5

What is semiconductor diode?

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

Question # 6

Give four application or uses of photodiode?

Ans 1: It is used as
1. Detection of both visible and invisible radiations.
2. Logic circuits
3. Automatic switching
4. Optical communication equipment

Question # 7

Define logic system and logic gates.

Ans 1: A digital system deals with the quantities or variable which have only two discrete values or state.
The electronic circuits which implements the various logic operation are known as logic gates.

Question # 8

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 # 9

What is photovoltaic cell?Discuss its working?

Ans 1: It consists of a thick n type region covered by a thin p-layer type.When exposed to light,it absorbs photon which generated electron-hole pairs.The electric field at the junction moves electron and holes and a current flow through the external circuit.And this current is directly proportional to the intensity of light.

Question # 10

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.

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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?

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

Define Open Loop gain of operational amplifier.

Differentiate between the forward biased and the reserve biase.

What is semiconductor diode?

Give four application or uses of photodiode?

Define logic system and logic gates.

Why is the photodiode operated in reverse biased state?

What is photovoltaic cell?Discuss its working?

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

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?

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

Define Open Loop gain of operational amplifier.

Differentiate between the forward biased and the reserve biase.

What is semiconductor diode?

Give four application or uses of photodiode?

Define logic system and logic gates.

Why is the photodiode operated in reverse biased state?

What is photovoltaic cell?Discuss its working?

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

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

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

What is photovoltaic cell?Discuss its working?

Why the base current is transistor is very small?

Define Depletion region?

What is photodiode?Write down its two main applications.

What is AND Gate?

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

Define current of gain of a transistor

How the normal operation of transistor is achieved?

Define logic system and logic gates.

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

Differentiate between the forward biased and the reserve biase.

What is photodiode?Write down its two main applications.

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

What is principle of vital ground?

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

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

What is AND Gate?

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

Why is the photodiode operated in reverse biased state?

Define current of gain of a transistor

ICS Part 2 Physics Chapter 18 Short Questions Preparation

12th Class Physics
Short Questions Preparation