ICS Part 2 Physics Chapter 18 Short Questions Preparation

Question # 1

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 # 2

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 # 3

Define Depletion region?

Ans 1: A region in a semiconductor device,usually at the junction of p-type and n-type materials ,in which there is neither an excess of electrons nor of holes is called depletion region,It charge less region.

Question # 4

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 # 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 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

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 # 8

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.

Question # 9

What is semiconductor diode?

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

Question # 10

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

Latest Educational News Stories

Pakistan's Largest Database of Colleges and Universities

BS Programs

University Past Papers

University Results

Exam Results 2024

Study Abroad Programs and Opportunities for Pakistani Students

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 is p-n junction formed?

Define Open Loop gain of operational amplifier.

Define Depletion region?

What is photovoltaic cell?Discuss its working?

How the current flows in forward and reverse biased diode?

Why is the photodiode operated in reverse biased state?

Give four application or uses of photodiode?

How is the XOR gate so called?

What is semiconductor diode?

What is photodiode?Write down its two main applications.

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 is p-n junction formed?

Define Open Loop gain of operational amplifier.

Define Depletion region?

What is photovoltaic cell?Discuss its working?

How the current flows in forward and reverse biased diode?

Why is the photodiode operated in reverse biased state?

Give four application or uses of photodiode?

How is the XOR gate so called?

What is semiconductor diode?

What is photodiode?Write down its two main applications.

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

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

Differentiate between the forward biased and the reserve biase.

Why is the photodiode operated in reverse biased state?

Give two applications of gated in control system.

What is AND Gate?

Define Open Loop gain of operational amplifier.

What is semiconductor diode?

How is p-n junction formed?

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

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

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

What is photovoltaic cell?Discuss its working?

Define Depletion region?

What is OP-GATE?

What do LED and LASER stand for?

Define Open Loop gain of operational amplifier.

Give four application or uses of photodiode?

What is meant by rectification?

Why is the photodiode operated in reverse biased state?

Explain why an ordinary Silicon diode does not emit light.

What is AND Gate?

ICS Part 2 Physics Chapter 18 Short Questions Preparation

Is this page helpful?

12th Class Physics
Short Questions Preparation