Semiconductors Device Solved MCQs Question Answers
1. Which one of the following is used for semiconductor is formed by___________bonds?
A. Electrovalent
B. Covalent
C. Co-ordinate
D. All of above
C. None of these
2. What is the most commonly used semiconductor is?
A. Carbon
B. Sulphur
C. Germanium
D. Silicon
3. The valence electrons of semiconductor has ___________.
A. 4
B. 2
C. 8
D. 3
4. Whenever any a pure semiconductor is heated, its resistance is ____________
A. Goes up
B. Remains the same
C. Goes down
D. None of these
5. When a pentavalent impurity is added to a pure semiconductor, it becomes an ………
A. n-type semiconductor
B. p-type semiconductor
C. intrinsic semiconductor
D. insulator
6. What is n-type semiconductor ________________?
A. Electrically neutral
B. Negatively charged
C. Positively charged
D. None of the these
7. Which of the following is an Addition of trivalent impurity to a semiconductor creates many_______?
A. Bound electrons
B. Valence electrons
C. Free electrons
D. Holes
8. A hole and electron in close proximity would tend to _________.
A. Repel each other
B. Have no effect on each other
C. Attract each other
D. All of the above
E. None of these
9. What is the random motion of holes and free electrons due to thermal agitation is called _________?
A. Ionization
B. Diffusion
C. Pressure
D. None of the these
10. Whenever the temperature is increases, intrinsic concentration increases which result in increase _______.
A. infinite
B. capacitivity
C. conductivity
D. conductivity
E. none of these
11. Which conductivity of a semiconductor can be drastically increased by adding controlled impurities to the intrinsic semiconductor is known as _______?
A. toxicity
B. excitation
C. attenuation
D. doping
12. Whenever electron jumps to conduction band, a Vacancy is left in the _____________ band.
A. Valenceconduction
B. Valence
C. forbidden energy
D. nucleus
E. none of these