A semiconductor material is one whose electrical properties lie between conductors and conductors. Germanium and silicon are the most well-known examples of these substances. It acts as an electron and charge carrier. Thus by adding impurities to pure germanium, the number of free electrons increases i.e. the conductivity of the crystal increases. Out of the five valence electrons of the non-atom, 4 electrons form covalent bonds with one valence electron each of the four atoms of germanium. The 5th valence electron separates from the atom of the impervious and begins to move freely within the crystal. Let's know more about Semiconductor Material In Physics.
1. What is the effect on the electrical conductivity of semiconductors when increasing temperature?
A. Electrical Conductivity Increases
B. Electrical Conductivity Decreasing
C. Electrical Conductivity Constant
D. None of these
2. What can be done to reduce or increase the conductivity of semiconductors?
A. Germanium
B. Silicon
C. Impurities
D. Tellurium
3. Which of the following are the special properties of semiconductors?
A. Increasing the heat increases the electrical conductivity of semiconductors
B. Can also be changed by electric field or light applied from outside
C. Electronic devices are made by doping
D. All of the above
4. Intrinsic semiconductor at room temperature will have,--------------------- available for conduction.
A. Electrons
B. Holes
C. Both of the above
D. None of these
5. Which one of the following is a semiconductor material?
A. Gallium arsenide
B. Phosphorous
C. Diamond
D. All of the above
6. Which of the following is true about Semiconductor material?
A. Negative temperature coefficient of resistance
B. Positive temperature coefficient of resistance
C. Both of the above
D. None of these
7. A semiconductor has generally ----------------- valence electrons.
A. 02
B. 04
C. 06
D. 08
8. The strength of a semiconductor crystal comes from---------------.
A. Forces between nuclei
B. Forces between protons
C. Electron-pair bonds
D. All of the above
9. A pn junction acts as a--------------.
A. Unidirectional switch
B. Controlled switch
C. Bidirectional switch
D. All of the above
10. Which type of material is obtained when an intrinsic semiconductor is doped with trivalent impurity?
A. P-type semiconductor
B. N-type semiconductor
C. Extrinsic semiconductor
D. None of these
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