2nd Year Physics Chapter 18 Online Preparation (Electronics)

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 current of gain of a transistor

Ans 1: The ratio of output current to input current is called current gain of a transistor.The ratio of collector current to base current is called current gain of a transistor.

Question # 3

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 # 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 OP-GATE?

Ans 1: OR-GATE implements the logic of OR operation.It has two or more inputs and a single output.Its output will be zero only when all the inputs are zero.

Question # 6

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 # 7

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 # 8

What is meant by rectification?

Ans 1: The conversing of alternating current signal into pulsating direct current signal is called rectification.The current for this purpose is called rectifier circuit.

Question # 9

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 # 10

What do LED and LASER stand for?

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

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2nd Year Physics Chapter 18 Online Preparation (Electronics)

Online Short Questions For Chapter 7 "12th Class Physics Chapter 7 Short Questions Preparation "

Physics - 12th Class Physics Chapter 7 Short Questions Preparation

How is p-n junction formed?

Define current of gain of a transistor

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

Differentiate between the forward biased and the reserve biase.

What is OP-GATE?

Define logic system and logic gates.

Give any two characteristics of operational amplifier.

What is meant by rectification?

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

What do LED and LASER stand for?

Prepare Complete Set Wise Questions For Chapter 7 "12th Class Physics Chapter 7 Short Questions Preparation "

Set 1

Set 2

Set 3

12th Class Physics Chapter 7 Short Questions Preparation - Set 1

How is p-n junction formed?

Define current of gain of a transistor

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

Differentiate between the forward biased and the reserve biase.

What is OP-GATE?

Define logic system and logic gates.

Give any two characteristics of operational amplifier.

What is meant by rectification?

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

What do LED and LASER stand for?

12th Class Physics Chapter 7 Short Questions Preparation - Set 2

What do LED and LASER stand for?

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

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

What is photovoltaic cell?Discuss its working?

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.

How is the XOR gate so called?

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

Define logic system and logic gates.

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

12th Class Physics Chapter 7 Short Questions Preparation - Set 3

Why charge carriers are not present in the depletion region?

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

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

What is principle of vital ground?

Write a note on LED.

How is the XOR gate so called?

What is photovoltaic cell?Discuss its working?

Differentiate between the forward biased and the reserve biase.

Define logic system and logic gates.

What is semiconductor diode?

12th Class Physics Ch 18 Preparation