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1. Electrical conductivity of insulators is in the range _______. (a) 10^-10 (Ω-mm)^-1 (b) 10^-10 (Ω-cm)^-1 (c) 10^-10 (Ω-m)^-1 (d) 10^-8 (Ω-m)^-1 2. Units for electric field strength (a) A/cm^2 (b) mho/meter (c) cm^2/V.s (d) V/cm 3. Energy band gap size for semiconductors is in the range eV. (a) 1-2 (b) 2-3 (c) 3-4 (d) > 4 4. Energy band gap size for insulators is in the range eV. (a) 1-2 (b) 2-3 (c) 3-4 (d) > 4 5. Flow of electrons is affected by the following (a) Thermal vibrations (b) Impurity atoms (c) Crystal defects (d) all 6. Not a superconductive metallic element (a) Fe (b) Al (c) Ti (d) W 7. Fermi energy level for intrinsic semiconductors lies (a) At middle of the band gap (b) Close to conduction band (c) Close to valence band (d) None 8. Fermi energy level for p-type extrinsic semiconductors lies (a) At middle of the band gap (b) Close to conduction band (c) Close to valence band (d) None 9. Fermi energy level for n-type extrinsic semiconductors lies (a) At middle of the band gap (b) Close to conduction band (c) Close to valence band (d) None 10. Not an example of an intrinsic semiconductor (a) Si (b) Al (c) Ge (d) Sn 11. In intrinsic semiconductors, the number of electrons the number of holes. (a) Equal (b) Greater than (c) Less than (d) Cannot define 12. In n-type semiconductors, the number of holes the number of electrons. (a) Equal (b) Greater than (c) Less than (d) Cannot define 13. In p-type semiconductors, the number of holes the number of electrons. (a) Equal (b) Greater than (c) Less than (d) Twice 14. Mobility of holes is _ mobility of electrons in intrinsic semiconductors. (a) Equal (b) Greater than (c) Less than (d) Cannot define 15. Fermi level for extrinsic semiconductors depends on (a) Donor element (b) Impurity concentration (c) Temperature (d) All 16. The value of the dielectric constant for a material . (a) Equal to 1 (b) Greater than 1 (c) Less than 1 (d) Zero 17. A high dielectric constant material is a must for . (a) Insulation of wires (b) Generators (c) Switch bases (d) Generators 18. The dielectric constant for most polymers lies in the range of _. (a) 1-3 (b) 2-5 (c) 4-7 (d) 6-10 19. An example of a piezoelectric material (a) Rochelle salt (b) Lead zirconate (c) Potassium niobate (d) Barium titanium oxide 20. An example of a ferroelectric material (a) Potassium niobate (b) Lead titanate (c) Lead zirconate (d) Quartz

          1. Electrical conductivity of insulators is in the range _____________. (a) 10^-10 (Ω-mm)^-1 (b) 10^-10 (Ω-cm)^-1 (c) 10^-10 (Ω-m)^-1 (d) 10^-8 (Ω-m)^-1
    2. Units for electric field strength (a) A/cm^2 (b) mho/meter (c) cm^2/V.s (d) V/cm
    3. Energy band gap size for semiconductors is in the range ________ eV. (a) 1-2 (b) 2-3 (c) 3-4 (d) > 4
    4. Energy band gap size for insulators is in the range ________ eV. (a) 1-2 (b) 2-3 (c) 3-4 (d) > 4
    5. Flow of electrons is affected by the following (a) Thermal vibrations (b) Impurity atoms (c) Crystal defects (d) all
    6. Not a superconductive metallic element (a) Fe (b) Al (c) Ti (d) W
    7. Fermi energy level for intrinsic semiconductors lies (a) At middle of the band gap (b) Close to conduction band (c) Close to valence band (d) None
    8. Fermi energy level for p-type extrinsic semiconductors lies (a) At middle of the band gap (b) Close to conduction band (c) Close to valence band (d) None
    9. Fermi energy level for n-type extrinsic semiconductors lies (a) At middle of the band gap (b) Close to conduction band (c) Close to valence band (d) None
    10. Not an example of an intrinsic semiconductor (a) Si (b) Al (c) Ge (d) Sn
    11. In intrinsic semiconductors, the number of electrons __________ the number of holes. (a) Equal (b) Greater than (c) Less than (d) Cannot define
    12. In n-type semiconductors, the number of holes __________ the number of electrons. (a) Equal (b) Greater than (c) Less than (d) Cannot define
    13. In p-type semiconductors, the number of holes __________ the number of electrons. (a) Equal (b) Greater than (c) Less than (d) Twice
    14. Mobility of holes is ___________ mobility of electrons in intrinsic semiconductors. (a) Equal (b) Greater than (c) Less than (d) Cannot define
    15. Fermi level for extrinsic semiconductors depends on (a) Donor element (b) Impurity concentration (c) Temperature (d) All
    16. The value of the dielectric constant for a material __________. (a) Equal to 1 (b) Greater than 1 (c) Less than 1 (d) Zero
    17. A high dielectric constant material is a must for __________. (a) Insulation of wires (b) Generators (c) Switch bases (d) Generators
    18. The dielectric constant for most polymers lies in the range of _______. (a) 1-3 (b) 2-5 (c) 4-7 (d) 6-10
    19. An example of a piezoelectric material (a) Rochelle salt (b) Lead zirconate (c) Potassium niobate (d) Barium titanium oxide
    20. An example of a ferroelectric material (a) Potassium niobate (b) Lead titanate (c) Lead zirconate (d) Quartz

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