ICS Part 2 Physics Chapter 18 Short Questions Preparation

Question # 1

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 # 2

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 # 3

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 # 4

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 # 5

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 # 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

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 # 8

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 # 9

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 # 10

What is semiconductor diode?

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

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

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

How the normal operation of transistor is achieved?

Explain why an ordinary Silicon diode does not emit light.

Define Depletion region?

What is principle of vital ground?

Write a note on LED.

Give two applications of gated in control system.

Why charge carriers are not present in the depletion region?

Differentiate between the forward biased and the reserve biase.

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

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

How the normal operation of transistor is achieved?

Explain why an ordinary Silicon diode does not emit light.

Define Depletion region?

What is principle of vital ground?

Write a note on LED.

Give two applications of gated in control system.

Why charge carriers are not present in the depletion region?

Differentiate between the forward biased and the reserve biase.

What is semiconductor diode?

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

How is the XOR gate so called?

What is semiconductor diode?

How the current flows in forward and reverse biased diode?

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

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

Give two applications of gated in control system.

Give four application or uses of photodiode?

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

Define logic system and logic gates.

Differentiate between the forward biased and the reserve biase.

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

How the normal operation of transistor is achieved?

Define logic system and logic gates.

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

What is the effect of forward biased and reverse biasing of a diode on the width of depletion region?

What is AND Gate?

Why charge carriers are not present in the depletion region?

Give any two characteristics of operational amplifier.

What is meant by rectification?

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

What is OP-GATE?

ICS Part 2 Physics Chapter 18 Short Questions Preparation

Is this page helpful?

12th Class Physics
Short Questions Preparation