Case Study based question Class 12 Solid state

CASE STUDY BASED QUESTIONS FOR CLASS 12 SOLID STATE

 the conductivity of silicon increases if it is doped with certain other elements doping means introduction of a small amount of impurities like was Barasat Sainik for Boron into the pure crystal in pure Silicon there are four cheese used in bonding with other for addition silicone or atom.
 When silicon crystal is doped with group 15 elements with 5 Valence Electrons such as S ,P,As,Sb,Bi  the structure of the crystal lattice remains unchanged out of the five valence electron of group 15 elements for electron are used in normal covalent bonding with silicone while fifth electron De localised and thus conducts electricity
 Doping silicon crystal with  group 13 element with three valence electrons such as Bad, Al, Ga or In. Introduces a semiconductor with 3 electrons Indo pant the place where 4th electronic machine is called an electron valency or hole.

 

1.Silicon that has been doped with group 15 elements called

A) p-type semiconductor
B) )n -type semiconductor
C) electron vacancy or hole
D) e-type semiconductor

ANSWER= (B) n -type semiconductor
Explain:-

 

2.Silicon that has been doped with property in element is called

A) p-type semiconductor
B) )n -type semiconductor
C) electron vacancy or hole
D) e-type semiconductor

ANSWER= (A) p -type semiconductor
Explain:-

 

3.If NaCl is doped with 10 raise to minus 3 mole percent SrCl2 then concentration of cation vacancies

A) 6.02*10^23
B) 6.02*10^20
C) 6.02*10^18
D) 6.02*10^15

ANSWER= (C) 6.02*10^18
Explain:-

 

4,What are the types of semiconductor I and II

A) I p-type,II n-type
B) II p-type,I n-type
C) both n-type
D) none

ANSWER= (B)II p-type,I n-type
Explain:-