SEMICONDUCTORS MCQs 20 min Score: 0 Attempted: 0/20 Subscribe 1. The process by which impurities are added to a pure semiconductor is: (A) Diffusing (B) Drift (C) Mixing (D) Doping 2. A Germanium atom contains _______. (A) Two electron orbits (B) Three valence electrons (C) Four valence electrons (D) Four protons 3. The type of atom bonding most common in semiconductor is _______. (A) Metallic (B) Ionic (C) Covalent (D) Chemical 4. The reverse resistance of an ideal diode is _______. (A) Low (B) Zero (C) Infinite (D) Very high 5. A circuit that removes positive or negative parts of a waveform is called: (A) Clamper (B) Rectifier (C) Clipper (D) Multiplier 6. Voltage multipliers are used to produce: (A) Low voltage and low current (B) Low voltage and high current (C) High voltage and low current (D) High voltage and high current 7. Diode acts as a closed switch when it is: (A) Not biased (B) Reverse biased (C) Forward biased (D) None of above 8. P region of a diode is called _______. (A) Cathode (B) Anode (C) Any of these (D) None of these 9. The amount of energy required to produce full conduction across the PN junction is _______. (A) Junction potential (B) Diode voltage (C) Biased potential (D) Barrier potential 10. The N region of a diode is called _______. (A) Anode (B) Cathode (C) Barrier potential (D) Biasing 11. A semiconductor device with a single PN junction that conducts current in only one direction is _______. (A) Transistor (B) Diode (C) SCR (D) Thyristor 12. The boundary between two different types of semiconductor materials is _______. (A) Triode (B) Diode (C) PN junction (D) Tetrode 13. The condition in which a diode prevents current is _______. (A) Forward bias (B) Breakdown (C) Conduction (D) Reverse bias 14. _______ is a semiconductor material. (A) Silicon (B) Germanium (C) Neither a nor b (D) Both a and b 15. The most widely used semiconductor material in electronic devices is _______. (A) Germanium (B) Carbon (C) Copper (D) Silicon 16. Electron-hole pairs are produced by _______. (A) Recombination (B) Ionization (C) Thermal energy (D) Doping 17. In an intrinsic semiconductor _______.(e) b and d (A) No free electrons (B) Free electrons are thermally produced (C) There are only holes (D) As many electrons as holes 18. When a diode is forward biased _______. (A) Current is produced by majority carriers (B) Only electron current flows (C) Only hole current flows (D) Current is produced both holes & electrons 19. For silicon diode, the value of forward bias voltage typically is _______. (A) > 0.3V (B) > 0.7V (C) Depends on depletion region (D) Depends on majority carriers 20. When a 60Hz sinusoidal voltage is applied to a half wave rectifier, the output frequency is _______. (A) 120Hz (B) 30Hz (C) 60Hz (D) 0Hz