This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Physics (Part Ii) Chapter 14 Semiconductor Electronics Materials – Quiz 15 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part Ii) Chapter 14 Semiconductor Electronics Materials Quiz 15 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Describe how a laser works. A) A laser produces a coherent beam of light through stimulated emission in an excited medium, amplified by mirrors. B) A laser emits light by reflecting it off a prism. C) A laser creates light by heating a metal filament. D) A laser generates light through chemical reactions in a gas. Show Answer Correct Answer: A) A laser produces a coherent beam of light through stimulated emission in an excited medium, amplified by mirrors. 2. What discovery in the 1930s showed promise for controlling charge flow? A) Semiconductors. B) Vacuum Tubes. C) Transistors. D) Diodes. Show Answer Correct Answer: A) Semiconductors. 3. Which of the following is a semiconductor? A) Silicon. B) Copper. C) Plastic. D) Brass. Show Answer Correct Answer: A) Silicon. 4. What is the purpose of doping in semiconductors? A) To reduce the size of semiconductor devices. B) The purpose of doping in semiconductors is to enhance their electrical conductivity by introducing charge carriers. C) To create a protective layer on the semiconductor surface. D) To improve the thermal conductivity of the material. Show Answer Correct Answer: B) The purpose of doping in semiconductors is to enhance their electrical conductivity by introducing charge carriers. 5. What is the purpose of a Schottky diode in electronic circuits? A) To increase the resistance in a circuit. B) To amplify weak signals in a circuit. C) The purpose of a Schottky diode is to provide fast switching and low forward voltage drop in electronic circuits. D) To store electrical energy for later use. Show Answer Correct Answer: C) The purpose of a Schottky diode is to provide fast switching and low forward voltage drop in electronic circuits. 6. What is the depletion region in a PN junction? A) A layer that enhances conductivity in the junction. B) A region where electrons and holes are abundant. C) The depletion region in a PN junction is a zone where charge carriers are depleted, resulting in an area with no free electrons or holes. D) A space filled with positive ions and negative charges. Show Answer Correct Answer: C) The depletion region in a PN junction is a zone where charge carriers are depleted, resulting in an area with no free electrons or holes. 7. Anode is ..... Polarity in diodes A) Negative. B) Positive. C) Ground. D) Hot Side. Show Answer Correct Answer: B) Positive. 8. What types of impurity atoms are added to increase the number of conduction-band electrons in intrinsic silicon? A) Octavalent. B) Pentavalent. C) Trivalent. D) Bivalent. Show Answer Correct Answer: B) Pentavalent. 9. Let n$_{p}$ and n$_{e }$ be the number density of holes and electrons respectively in a pure semiconductor. Then, A) N$_{p }$<$_{ }$n$_{e}$. B) N$_{p}$= n$_{e}$. C) N$_{p }$>$_{ }$n$_{e}$. D) None of above. Show Answer Correct Answer: B) N$_{p}$= n$_{e}$. 10. If fermi levels is at mid of valence band and conduction band at absolute zero temperature then the material is: A) Conductor. B) Semiconductor. C) Insulator. D) None of the above. Show Answer Correct Answer: B) Semiconductor. 11. What is the role of the forbidden band gap in determining the conductivity of a material? A) Decreases conductivity. B) Increases conductivity. C) Determines conductivity. D) No effect on conductivity. Show Answer Correct Answer: A) Decreases conductivity. 12. What determines the behavior of doped semiconductors? A) Temperature. B) Magnetic Field. C) Charge Carriers. D) Voltage. Show Answer Correct Answer: C) Charge Carriers. 13. What is the difference between conductors and semiconductors? A) Conductors allow electricity to flow freely, while semiconductors can control the flow of electricity. B) Conductors are used in insulators, while semiconductors are used in conductors. C) Conductors have a higher resistance than semiconductors. D) Semiconductors can only conduct electricity at high temperatures, while conductors can do so at all temperatures. Show Answer Correct Answer: A) Conductors allow electricity to flow freely, while semiconductors can control the flow of electricity. 14. In intrinsic semiconductor at room temperature, the number of electrons and holes are: A) Same. B) Different. C) Infinite. D) Zero. Show Answer Correct Answer: A) Same. 15. What type of materials have electrical conductivity between that of insulators and conductors? A) Insulators. B) Conductors. C) Semiconductors. D) Superconductors. Show Answer Correct Answer: C) Semiconductors. 16. How do LEDs (Light Emitting Diodes) work? A) By reflecting light. B) By converting electricity into light. C) By storing light. D) By amplifying light. Show Answer Correct Answer: B) By converting electricity into light. 17. What is the significance of the Hall effect in semiconductors? A) The Hall effect measures the voltage across a conductor in a magnetic field only in metals. B) The Hall effect is primarily used for energy storage in semiconductor devices. C) The Hall effect enables measurement of charge carrier concentration and type in semiconductors. D) The Hall effect is used to increase the temperature of semiconductors. Show Answer Correct Answer: C) The Hall effect enables measurement of charge carrier concentration and type in semiconductors. 18. The ratio of majority and minority charge carriers in intrinsic semiconductors is unity A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 19. The voltage across an LED is 1.5 V when it is in a circuit with 9 V battery and a 225 $\Omega$ resistor. What is the current through the resistor? A) 6.7 mA. B) 33 mA. C) 40 mA. D) 47 mA. Show Answer Correct Answer: B) 33 mA. 20. Solar cells first became a practical energy source for NASA for what application? A) Space Shuttle. B) Rocket boosters. C) Rovers. D) Satellites. Show Answer Correct Answer: D) Satellites. 21. Explain the concept of optical fibers in photonics. A) Optical fibers are only used in medical applications and have no data communication role. B) Optical fibers are primarily used for electrical signal transmission. C) Optical fibers are made of metal and conduct electricity. D) Optical fibers are used to transmit light signals through total internal reflection, enabling efficient data communication and various photonic applications. Show Answer Correct Answer: D) Optical fibers are used to transmit light signals through total internal reflection, enabling efficient data communication and various photonic applications. 22. What are p-type semiconductors? A) Semiconductors that have been doped with elements that create 'holes' for electrons to move into. B) Semiconductors that have a high concentration of free electrons. C) Semiconductors that are made entirely of metals. D) Semiconductors that do not conduct electricity at all. Show Answer Correct Answer: A) Semiconductors that have been doped with elements that create 'holes' for electrons to move into. 23. ..... donates an electrons that it free to move. A) Donor impurities. B) Boron. C) Acceptor impurities. D) Atom. Show Answer Correct Answer: A) Donor impurities. 24. What is the function of a transistor? A) To convert AC to DC. B) The function of a transistor is to act as a switch or amplifier. C) To store electrical energy. D) To increase voltage without amplification. Show Answer Correct Answer: B) The function of a transistor is to act as a switch or amplifier. 25. Doping of Semiconductors A) Materials which can conduct electricity better than insulator, but not as well as conductors. B) The process of adding of a certain amount of specific impurities atoms in the pure semiconductor. C) When 4 electrons in outermost orbit. D) None of the above. Show Answer Correct Answer: B) The process of adding of a certain amount of specific impurities atoms in the pure semiconductor. ← 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 8Class 12 Physics (Part Ii) Chapter 14 Semiconductor Electronics Materials Quiz 9Class 12 Physics (Part Ii) Chapter 14 Semiconductor Electronics Materials Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books