This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Physics (Part Ii) Chapter 14 Semiconductor Electronics Materials – Quiz 8 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part Ii) Chapter 14 Semiconductor Electronics Materials Quiz 8 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. A full-wave rectifier consist of ..... A) 1 Diode. B) 2 Diode. C) 3 Diode. D) 4 Diode. Show Answer Correct Answer: B) 2 Diode. 2. Semiconductors are made of A) Silicon. B) Gold. C) Germaniam. D) Both a and c. Show Answer Correct Answer: D) Both a and c. 3. What role do impurities play in the formation of N-type and P-type semiconductors? A) Impurities reduce the conductivity of both N-type and P-type semiconductors. B) Impurities only affect the thermal properties of semiconductors. C) Impurities have no effect on the electronic properties of semiconductors. D) Impurities introduce extra electrons in N-type semiconductors and create holes in P-type semiconductors. Show Answer Correct Answer: D) Impurities introduce extra electrons in N-type semiconductors and create holes in P-type semiconductors. 4. The characteristics of p-type semiconductors includes ..... A) Majority carriers are electron. B) Has tendency to gain electron. C) Has tendency to donor electron. D) Easy to conduct electricity. Show Answer Correct Answer: A) Majority carriers are electron. 5. Allows current to flow in only one direction A) Resistor. B) LED. C) Diode. D) Capacitor. Show Answer Correct Answer: C) Diode. 6. Describe the process of rectification in electrical circuits. A) Rectification involves the use of capacitors to store electrical energy. B) Rectification is the process of converting DC to AC using transformers. C) Rectification is the conversion of AC to DC using diodes. D) Rectification is the method of amplifying electrical signals in circuits. Show Answer Correct Answer: C) Rectification is the conversion of AC to DC using diodes. 7. Which of the following has low threshold current density? A) Homojunction laser. B) CO$_{2}$ laser. C) Heterojunction laser. D) He-Ne laser. Show Answer Correct Answer: C) Heterojunction laser. 8. Which of the following is a characteristic of vacuum tubes? A) Robust. B) Compact. C) Operated at low voltages. D) Bulky and fragile. Show Answer Correct Answer: D) Bulky and fragile. 9. How does a diode function in an electrical circuit? A) It allows current to flow in both directions. B) It blocks current flow in all conditions. C) It allows current to flow in one direction only. D) It amplifies current. Show Answer Correct Answer: C) It allows current to flow in one direction only. 10. What is the function of a diode? A) Acts as a current amplifier. B) Acts as an automatic switch. C) Stores electric charge. D) Allows the current to pass in one direction only. Show Answer Correct Answer: D) Allows the current to pass in one direction only. 11. What are the applications of light-emitting diodes (LEDs)? A) LEDs are only used in high-end audio equipment. B) LEDs are mainly found in traditional incandescent bulbs. C) LEDs are primarily used for solar energy generation. D) LEDs are used in general lighting, display screens, indicator lights, automotive lighting, traffic signals, and decorative lighting. Show Answer Correct Answer: D) LEDs are used in general lighting, display screens, indicator lights, automotive lighting, traffic signals, and decorative lighting. 12. Electrons from valence band rises to conduction band when the temperature is greater than 0 k. Is it True or False? A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 13. How do light-emitting diodes (LEDs) work? A) LEDs produce light by reflecting sunlight off a surface. B) LEDs work by heating a metal filament until it glows. C) LEDs generate light through chemical reactions in batteries. D) LEDs emit light when an electric current flows through a semiconductor, causing electron-hole recombination and photon emission. Show Answer Correct Answer: D) LEDs emit light when an electric current flows through a semiconductor, causing electron-hole recombination and photon emission. 14. What is the relationship between current and voltage in a transistor amplifier? A) The current is proportional to the voltage applied at the input, allowing for amplification in a transistor amplifier. B) Voltage is always higher than current in a transistor amplifier. C) Current is independent of voltage in a transistor amplifier. D) Current and voltage are inversely related in a transistor amplifier. Show Answer Correct Answer: A) The current is proportional to the voltage applied at the input, allowing for amplification in a transistor amplifier. 15. In forward biased diode Diffusion capacitance is much larger than Transition Capacitance. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 16. The breakdown which occurs due to Collision in Charge Carriers is called: A) Zener Breakdown. B) Avalanche Bfrreakdown. C) All the above. D) None of the above. Show Answer Correct Answer: B) Avalanche Bfrreakdown. 17. A crystal diode has ..... pn junction. A) One. B) Two. C) Three. D) More than four. Show Answer Correct Answer: A) One. 18. In reverse biasing: A) In reverse biasing:. B) No current flows. C) Depletion layer resistance increases. D) Potential barrier across junction increases. Show Answer Correct Answer: D) Potential barrier across junction increases. 19. Describe the basic structure of a semiconductor diode. A) A semiconductor diode is made of metal and insulator layers. B) A semiconductor diode consists of only n-type material. C) A semiconductor diode has a single type of semiconductor material. D) A semiconductor diode is made of p-type and n-type semiconductor materials forming a p-n junction. Show Answer Correct Answer: D) A semiconductor diode is made of p-type and n-type semiconductor materials forming a p-n junction. 20. What is the process of adding impurities to semiconductors to modify their electrical properties? A) Fusion. B) Doping. C) Evaporation. D) Sublimation. Show Answer Correct Answer: B) Doping. 21. The electric current produced due to the steady flow of electrons in one direction is called A) Drift current. B) Diffusion Current. C) All the above. D) None of the above. Show Answer Correct Answer: A) Drift current. 22. There is a small amount of current across the barrier of a reverse-biased diode. This current is called as A) Reverse breakdown current. B) Conventional current. C) Reverse leakage current. D) Forward-bias current. Show Answer Correct Answer: C) Reverse leakage current. 23. In GaAs semiconductor diode, the band gap of GaAs is 1.44eV. Calculate the wavelength. A) 8400 Angstroms. B) 8000 Angstroms. C) 8628 Angstroms. D) 8200 Angstroms. Show Answer Correct Answer: C) 8628 Angstroms. 24. Which of the following statements is incorrect for the depletion region of a diode? A) There the mobile charges exist. B) Equal number of holes and electrons exist, making the region neutral. C) Recombination of holes and electrons has taken place. D) None of these. Show Answer Correct Answer: A) There the mobile charges exist. 25. What is the process of doping in semiconductors? A) Removing impurities from a semiconductor to decrease its electrical properties. B) Introducing impurities into a semiconductor to change its electrical properties. C) Adding water to a semiconductor to increase its conductivity. D) Heating a semiconductor to change its color. Show Answer Correct Answer: B) Introducing impurities into a semiconductor to change its electrical properties. ← PreviousNext →Related QuizzesClass 12 Physics (Part Ii) Chapter 14 Semiconductor Electronics Materials Quiz 1Class 12 Physics (Part Ii) Chapter 14 Semiconductor Electronics Materials Quiz 2Class 12 Physics (Part Ii) Chapter 14 Semiconductor Electronics Materials Quiz 3Class 12 Physics (Part Ii) Chapter 14 Semiconductor Electronics Materials Quiz 4Class 12 Physics (Part Ii) Chapter 14 Semiconductor Electronics Materials Quiz 5Class 12 Physics (Part Ii) Chapter 14 Semiconductor Electronics Materials Quiz 6Class 12 Physics (Part Ii) Chapter 14 Semiconductor Electronics Materials Quiz 7Class 12 Physics (Part Ii) Chapter 14 Semiconductor Electronics Materials Quiz 9Class 12 Physics (Part Ii) Chapter 14 Semiconductor Electronics Materials Quiz 10Class 12 Physics (Part Ii) Chapter 14 Semiconductor Electronics Materials Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books