25 MCQ for the basics of ELECTRONICS and semiconductors I very important for Physics Exam

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this video is related with the MCQ on semiconductors and associated topics.
0:00 what is the position of semiconductors in periodic table?
2:15 how many electrons in valence cell of semiconductors?
2:50 what is pure state of semiconductors?
Notes:
The semiconductor is divided into two types.
One is Intrinsic Semiconductor and other is an Extrinsic semiconductor. The pure form of the semiconductor is known as the intrinsic semiconductor and the semiconductor in which intentionally impurities is added for making it conductive is known as the extrinsic semiconductor.
Doping
The process by which an impurity is added to a semiconductor is known as Doping. The amount and type of impurity which is to be added to the material have to be closely controlled during the preparation of extrinsic semiconductor.
Generally, one impurity atom is added to 108 atoms of a semiconductor. The purpose of adding impurity in the semiconductor crystal is to increase the number of free electrons or holes to make it conductive. If a Pentavalent impurity, having five valence electrons is added to a pure semiconductor a large number of free electrons will exist. If a trivalent impurity having three valence electrons is added, a large number of holes will exist in the semiconductor.
Depending upon the type of impurity added the extrinsic semiconductor may be classified as n type semiconductor and p type semiconductor
FAQs
1). What is an intrinsic and extrinsic semiconductor?

The pure type of semiconductor is the intrinsic type whereas the extrinsic is, the semiconductor in which impurities can be added to make it conductive.

2). What are the examples of intrinsic type?

They are Silicon & germanium

3). What are the types of extrinsic semiconductors?

They are P-type and N-type semiconductors

4).Why extrinsic semiconductors are used in electronics manufacturing?

Because the electrical conductivity of the extrinsic type is high compare with intrinsic. So these are applicable in designing transistors, diodes, etc.

5). What is the conductivity of intrinsic?

In a semiconductor, the impurities & structural defects have an extremely low concentration is known as the conductivity of intrinsic.

Thus, this is all about an overview of the Intrinsic Semiconductor and Extrinsic Semiconductor and energy band diagram with doping. Here is a question for you, what is the temperature of intrinsic?

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