ICS Part 2 Physics Chapter 18 Short Questions Preparation

Question # 1

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 # 2

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

Ans 1: When forward biased then the width of depletion region decreases and when reverse biased then the width of depletion region increase.

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

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

Give any two characteristics of operational amplifier.

Ans 1: Input Resistance: It is the resistance between the + and - input of the amplifier,Whose value is of the order of several mega ohms.
Output resistance:It is the resistance between the output terminal and ground.Its value is only a few ohms.

Question # 6

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 # 7

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

Ans 1: At the formation of pn-junction ,the free electrons in n-region because of their random motion diffuse into the p-region,.As a result of this diffusion a region is formed around the junction consisting of positive and negative ions,Due to charge on these ions a potential difference develops across the depletion region,This potential difference is called potential barrier,stops further diffusion of electron into the p-region.

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

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 # 10

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.

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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

Give two applications of gated in control system.

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

Explain why an ordinary Silicon diode does not emit light.

What is principle of vital ground?

Give any two characteristics of operational amplifier.

What is photodiode?Write down its two main applications.

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

How is the XOR gate so called?

Why the base current is transistor is very small?

How the current flows in forward and reverse biased 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

Give two applications of gated in control system.

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

Explain why an ordinary Silicon diode does not emit light.

What is principle of vital ground?

Give any two characteristics of operational amplifier.

What is photodiode?Write down its two main applications.

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

How is the XOR gate so called?

Why the base current is transistor is very small?

How the current flows in forward and reverse biased diode?

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

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

How is p-n junction formed?

What is meant by rectification?

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

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

Explain why an ordinary Silicon diode does not emit light.

Define current of gain of a transistor

What is principle of vital ground?

Define logic system and logic gates.

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

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.

What is meant by rectification?

Define Open Loop gain of operational amplifier.

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

What do LED and LASER stand for?

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

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

What is semiconductor diode?

What is photodiode?Write down its two main applications.

ICS Part 2 Physics Chapter 18 Short Questions Preparation

12th Class Physics
Short Questions Preparation