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

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 # 3

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 # 4

What is principle of vital ground?

Ans 1: In an operational amplifier ,if the non inverting terminal is grounded by the concept of virtual ground the inverting terminal is also at ground potential though there is no physical connection between the inverting terminal and the ground,This is the principle of virtual ground.

Question # 5

What do LED and LASER stand for?

Ans 1: LED stands for light emitting diode..
Laser stands for light amplification stimulated emission radiation .

Question # 6

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 # 7

Why charge carriers are not present in the depletion region?

Ans 1: This is due to the fact when an electron from an n region diffuses into the p-region,it leaves behind a positive ion.When this electron recombines with the hole in the p-region,a negative ion is formed,So no charge carrier are available in this region,though it contains immobile positive and negative ions.

Question # 8

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 # 9

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 # 10

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.

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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.

Give four application or uses of photodiode?

How is p-n junction formed?

What is principle of vital ground?

What do LED and LASER stand for?

Write a note on LED.

Why charge carriers are not present in the depletion region?

Why the base current is transistor is very small?

Give two applications of gated in control system.

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

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.

Give four application or uses of photodiode?

How is p-n junction formed?

What is principle of vital ground?

What do LED and LASER stand for?

Write a note on LED.

Why charge carriers are not present in the depletion region?

Why the base current is transistor is very small?

Give two applications of gated in control system.

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

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

Give four application or uses of photodiode?

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

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

Write a note on LED.

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

Explain why an ordinary Silicon diode does not emit light.

Why is the photodiode operated in reverse biased state?

What is OP-GATE?

What is meant by rectification?

What is AND Gate?

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

What is OP-GATE?

Define logic system and logic gates.

Why charge carriers are not present in the depletion region?

How is p-n junction formed?

Define Depletion region?

What is principle of vital ground?

Define Open Loop gain of operational amplifier.

Why is the photodiode operated in reverse biased state?

Why the base current is transistor is very small?

Give four application or uses of photodiode?

ICS Part 2 Physics Chapter 18 Short Questions Preparation

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