This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Physics (Part Ii) Chapter 14 Semiconductor Electronics Materials – Quiz 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part Ii) Chapter 14 Semiconductor Electronics Materials Quiz 1 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. At absolute zero, Si acts as a A) Semiconductor. B) Conductor. C) Insulator. D) Non of these. Show Answer Correct Answer: C) Insulator. 2. These are the characteristics of pentavalent impurities except A) *5 valence electron. B) *contributing extra free electrons. C) *produce n-type semiconductors. D) *produce p-type semiconductors. Show Answer Correct Answer: D) *produce p-type semiconductors. 3. What are the two commonly used semiconductors? A) Copper and aluminum. B) Silver and gold. C) Mica and quartz. D) Silicon and germanium. Show Answer Correct Answer: D) Silicon and germanium. 4. What are the advantages of using a full wave rectifier over a half wave rectifier? A) Full wave rectifiers provide higher efficiency, lower ripple voltage, and utilize both halves of the AC signal. B) Full wave rectifiers are more complex and harder to design. C) Half wave rectifiers are more efficient than full wave rectifiers. D) Full wave rectifiers only use one half of the AC signal. Show Answer Correct Answer: A) Full wave rectifiers provide higher efficiency, lower ripple voltage, and utilize both halves of the AC signal. 5. Explain how integrated circuits are related to semiconductors. A) Semiconductors are used only in solar panels, not in integrated circuits. B) Integrated circuits do not require any materials to function. C) Integrated circuits are built using semiconductor materials, enabling their functionality. D) Integrated circuits are made entirely of metals. Show Answer Correct Answer: C) Integrated circuits are built using semiconductor materials, enabling their functionality. 6. The material with the biggest forbidden gap is called A) Insulator. B) Conductor. C) Semi-conductor. D) None of the above. Show Answer Correct Answer: A) Insulator. 7. How does the resistance of a semiconductor change with an increase in temperature? A) It remains constant. B) It decreases as temperature increases. C) It increases as temperature increases. D) It fluctuates randomly. Show Answer Correct Answer: B) It decreases as temperature increases. 8. Which is an example for Intrinsic semiconductor A) Gallium Arsenide. B) Germanium. C) Indium phosphate. D) None of the above. Show Answer Correct Answer: B) Germanium. 9. The most widely used semi-conductive material in electronic device A) Germanium. B) Carbon. C) Cooper. D) Silicon. Show Answer Correct Answer: D) Silicon. 10. What are the main types of diodes and their characteristics? A) Resistor Diode. B) Capacitor Diode. C) The main types of diodes are Standard Diode, Zener Diode, Schottky Diode, Light Emitting Diode (LED), Photodiode, and Varactor Diode. D) Transistor Diode. Show Answer Correct Answer: C) The main types of diodes are Standard Diode, Zener Diode, Schottky Diode, Light Emitting Diode (LED), Photodiode, and Varactor Diode. 11. Copper, silver and gold are good A) Insulators. B) Semiconductors. C) Conductors. D) Super insulators. Show Answer Correct Answer: C) Conductors. 12. Direct band semiconductors are used to make A) Diode. B) Transisters. C) LED, Laser diodes. D) Integrated circuits. Show Answer Correct Answer: C) LED, Laser diodes. 13. A semiconductor power device can conduct current when it is in forward-biased condition. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 14. Which of the following is a material that allows current to easily flow through it? A) Semiconductor. B) Conductor. C) Insulator. D) Plastic. Show Answer Correct Answer: B) Conductor. 15. What is the function of transistors in earphones? A) To convert music into electricity. B) To amplify the sound signals. C) To decrease the sound quality. D) To store music. Show Answer Correct Answer: B) To amplify the sound signals. 16. Which of the following is NOT an example of a modern electronic device that relies on semiconductors? A) Diodes. B) Integrated Circuits. C) Vacuum Tubes. D) Transistors. Show Answer Correct Answer: C) Vacuum Tubes. 17. Which is not one of the properties of semiconductor? A) 4 electrons in outermost orbit, in covalent bonding. B) Valence Band and Conduction Band overlap each other. C) Electron free leaves hole. D) Semiconductor has 2 types of charge carriers. Show Answer Correct Answer: B) Valence Band and Conduction Band overlap each other. 18. The flow of holes from the n-region uncovers ..... charged acceptor ions. A) Negatively. B) Positively. C) Current. D) Voltage. Show Answer Correct Answer: B) Positively. 19. Region containing uncompensated ions is depleted of charge carriers and thus known as ..... A) Depletion region. B) Potential Barrier. C) Transition Region. D) All of the above. Show Answer Correct Answer: D) All of the above. 20. In an electrical panel, where might you find semiconductors? A) Circuit breakers. B) Contactors. C) VFD. D) Grounding rods. Show Answer Correct Answer: C) VFD. 21. With forward bias to a pn junction, the width of depletion layer ..... A) Decreases. B) Increases. C) Remains the same. D) None of the above. Show Answer Correct Answer: A) Decreases. 22. Describe the IV characteristics of a diode. A) The IV characteristics of a diode show exponential current increase in forward bias and minimal current in reverse bias until breakdown. B) The IV characteristics of a diode show linear current increase in both forward and reverse bias. C) Diodes conduct current equally in both directions regardless of bias. D) The IV characteristics of a diode are constant with no change in current for any voltage. Show Answer Correct Answer: A) The IV characteristics of a diode show exponential current increase in forward bias and minimal current in reverse bias until breakdown. 23. How does temperature affect the performance of semiconductors? A) Temperature only affects the physical size of semiconductors. B) Temperature increases carrier concentration but can reduce mobility, affecting overall performance. C) Temperature has no effect on semiconductor performance. D) Higher temperatures always improve mobility in semiconductors. Show Answer Correct Answer: B) Temperature increases carrier concentration but can reduce mobility, affecting overall performance. 24. What is the purpose of a load resistor in a transistor amplifier circuit? A) To filter out high-frequency noise in the signal. B) To provide thermal stability to the transistor. C) To increase the input impedance of the circuit. D) To convert output current to voltage and set amplifier gain. Show Answer Correct Answer: D) To convert output current to voltage and set amplifier gain. 25. What happens when a semiconductor junction is forward biased? A) It blocks current flow. B) It allows current to flow. C) It amplifies voltage. D) It stores charge. Show Answer Correct Answer: B) It allows current to flow. 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