This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Physics (Part Ii) Chapter 14 Semiconductor Electronics Materials – Quiz 7 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part Ii) Chapter 14 Semiconductor Electronics Materials Quiz 7 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What is the significance of the energy band gap in semiconductors? A) The energy band gap is irrelevant to semiconductor performance. B) The energy band gap only affects thermal conductivity. C) The energy band gap is significant as it determines the electrical conductivity and optical properties of semiconductors. D) The energy band gap is the same for all materials regardless of type. Show Answer Correct Answer: C) The energy band gap is significant as it determines the electrical conductivity and optical properties of semiconductors. 2. In a half wave rectifier circuit operating from 50 Hz mains frequency, the fundamental frequency in the ripple would be A) 25 Hz. B) 50 Hz. C) 70.7 Hz. D) 100 Hz. Show Answer Correct Answer: B) 50 Hz. 3. What is the function of a rectifier diode in power supply circuits? A) To filter out noise from the circuit. B) To store energy for later use. C) To amplify the AC signal. D) The function of a rectifier diode in power supply circuits is to convert AC to DC. Show Answer Correct Answer: D) The function of a rectifier diode in power supply circuits is to convert AC to DC. 4. What are the two main types of semiconductors? A) Superconductors and Dielectrics. B) Conductive and Insulative semiconductors. C) Organic and Inorganic semiconductors. D) Intrinsic and Extrinsic semiconductors. Show Answer Correct Answer: D) Intrinsic and Extrinsic semiconductors. 5. Explain the concept of reverse bias in diodes. A) In reverse bias, the diode conducts electricity freely without resistance. B) Reverse bias reduces the depletion region, increasing current flow. C) Reverse bias in diodes is a condition where the diode blocks current flow by widening the depletion region, allowing only a small leakage current. D) Reverse bias allows maximum current flow through the diode. Show Answer Correct Answer: C) Reverse bias in diodes is a condition where the diode blocks current flow by widening the depletion region, allowing only a small leakage current. 6. What happen to the bias, when the crystal current diode is large? A) Forward. B) Poor. C) Reverse. D) Inverse. Show Answer Correct Answer: A) Forward. 7. ..... has accepted a valence electron, has a net negative charge, but cannot move and a hole is created can be contribute of holes without electrons being generated. A) Atom. B) Acceptor impurities. C) Donor impurities. D) Phosphorus. Show Answer Correct Answer: B) Acceptor impurities. 8. Carrier concentration in metals is A) ZE x FE. B) Z(E) x F(E) dE. C) N(E)dE x F(E) dE. D) Z(E)dE. Show Answer Correct Answer: B) Z(E) x F(E) dE. 9. What the advantages of semiconductor? A) Requires more input power. B) Smaller size. C) Operates with high voltages. D) Bulky. Show Answer Correct Answer: B) Smaller size. 10. What is the difference between LED and laser diodes? A) LEDs are always monochromatic, while laser diodes can emit multiple colors. B) LEDs emit incoherent light, while laser diodes emit coherent light. C) LEDs are used for high-intensity applications, while laser diodes are not. D) Laser diodes consume more power than LEDs. Show Answer Correct Answer: B) LEDs emit incoherent light, while laser diodes emit coherent light. 11. Give an example of a common semiconductor material. A) Silicon. B) Copper. C) Aluminum. D) Gold. Show Answer Correct Answer: A) Silicon. 12. What can transistors do by controlling the flow of charge carriers between layers? A) Create Light. B) Amplify Signals. C) Generate Heat. D) Block Current. Show Answer Correct Answer: B) Amplify Signals. 13. Rectifier converts A) D.C. current to A.C current. B) A.C current to D.C current. C) All the above. D) None of the above. Show Answer Correct Answer: B) A.C current to D.C current. 14. What is the intentional introduction of impurities into an intrinsic semiconductor for the purpose of modulating its electrical, optical and structural properties? A) Doping. B) Conduction. C) Impurification. D) Electromagnetic field. Show Answer Correct Answer: A) Doping. 15. How does the band gap in semiconductors affect their conductivity? A) It increases the resistance of semiconductors. B) It causes the electrons to move freely in semiconductors. C) It has no effect on the conductivity of semiconductors. D) It affects the conductivity by determining the energy required for electrons to move from the valence band to the conduction band. Show Answer Correct Answer: D) It affects the conductivity by determining the energy required for electrons to move from the valence band to the conduction band. 16. Which material is most commonly used in semiconductor components? A) Silicon. B) Copper. C) Aluminum. D) Gold. Show Answer Correct Answer: A) Silicon. 17. What is the energy difference between the conduction band and the valence band called? A) Energy Gap. B) Conductivity. C) Band Width. D) Charge Carrier. Show Answer Correct Answer: A) Energy Gap. 18. Transistor has 3 electrodes namely A) PNP. B) NPN. C) Base/ Collector/ Emitter. D) Drain/ Gate/ Source. Show Answer Correct Answer: C) Base/ Collector/ Emitter. 19. We use who's law to help us with circuit calculations? A) Resistance. B) Volts. C) Amps. D) Ohms. Show Answer Correct Answer: D) Ohms. 20. Application of Semiconductors A) Television. B) Mobile. C) Modern Train. D) All of the above. Show Answer Correct Answer: D) All of the above. 21. Intrinsic semiconductor at room temperature will have, ..... available for conduction A) Electrons. B) Holes. C) Both electrons and holes. D) None of the above. Show Answer Correct Answer: C) Both electrons and holes. 22. In a p-type semiconductor, the acceptor valence band is A) Close to the valence band of the host crystal. B) Close to conduction band of the host crystal. C) Below the conduction band of the host crystal. D) Above the conduction band of the host crystal. Show Answer Correct Answer: A) Close to the valence band of the host crystal. 23. What is the principle of operation of a diode? A) A diode allows current to flow in one direction only. B) A diode amplifies electrical signals. C) A diode allows current to flow in both directions. D) A diode stores electrical energy. Show Answer Correct Answer: A) A diode allows current to flow in one direction only. 24. What are the challenges in semiconductor manufacturing? A) Abundant raw materials. B) Low energy consumption. C) High costs, process complexity, supply chain issues, quality control, and rapid technological changes. D) Simple manufacturing process. Show Answer Correct Answer: C) High costs, process complexity, supply chain issues, quality control, and rapid technological changes. 25. What are the key components of an integrated circuit? A) Transistors, resistors, capacitors, and diodes. B) Inductors, transformers, op-amps, and LEDs. C) Microcontrollers, sensors, actuators, and switches. D) Printed circuit boards, connectors, wires, and batteries. Show Answer Correct Answer: A) Transistors, resistors, capacitors, and diodes. ← 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 8Class 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