BASIC ELECTRONICS MCQs 5
Choose correct or the best alternative in the following: BASIC ELECTRONICS MCQs 5
1. Electrical conductivity of insulators is 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/cm2
- (b) mho/meter
- (c) cm2 /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 super conductive 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 for intrinsic semiconductor
- (a) Si
- (b) Al
- (c) Ge
- (d) Sn
11. In intrinsic semiconductors, number of electrons __________ number of holes.
- (a) Equal
- (b) Greater than
- (c) Less than
- (d) Cannot define
12. In n-type semiconductors, number of holes __________ number of electrons.
- (a) Equal
- (b) Greater than
- (c) Less than
- (d) Cannot define
13. In p-type semiconductors, number of holes __________ number of electrons.
- (a) Equal
- (b) Greater than
- (c) Less than
- (d) Twice
14. Mobility of holes is ___________ mobility ofelectrons in intrinsic semiconductors.
- (a) Equal
- (b) Greater than
- (c) Less than
- (d) Cannot define
15. Fermi level for extrinsic semiconductor depends on
- (a) Donor element
- (b) Impurity concentration
- (c) Temperature
- (d) All
16. Value of dielectric constant for a material __________.
- (a) Equal to 1
- (b) Greater than1
- (c) Less than 1
- (d) Zero.
17. High dielectric constant material is must for __________.
- (a) Insulation of wires
- (b) Generators
- (c) Switch bases
- (d) Generators.
18. Dielectric constant for most polymers lies in the range of _______.
- (a) 1-3
- (b) 2-5
- (c) 4-7
- (d) 6-10.
19. Example for piezo-electric material
- (a) Rochelle salt
- (b) Lead zirconate
- (c) Potassium niobate
- (d) Barium Titanium oxide
20. Example for ferro-electric material
- (a) Potassium niobate
- (b) Lead titanate
- (c) Lead zirconate
- (d) quartz
Answers: BASIC ELECTRONICS MCQs 5
- 1. a
- 2. c
- 3. b
- 4. c
- 5. d
- 6. b
- 7. c
- 8. b
- 9. b
- 10. a
- 11. c
- 12. d
- 13. a
- 14. d
- 15. d
- 16. a
- 17. a
- 18. c
- 19. b
- 20. b