This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Physics (Part Ii) Chapter 14 Semiconductor Electronics Materials – Quiz 14 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part Ii) Chapter 14 Semiconductor Electronics Materials Quiz 14 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What are the two types of doping in semiconductors? A) Positive doping and negative doping. B) X-type doping and y-type doping. C) A-type doping and b-type doping. D) N-type doping and p-type doping. Show Answer Correct Answer: D) N-type doping and p-type doping. 2. Semiconductor is A) Poor conductivity. B) Lies between conductivity and insulator. C) All the above. D) None of the above. Show Answer Correct Answer: B) Lies between conductivity and insulator. 3. The most commonly used semiconductor material is A) Germanium. B) Silicon. C) Indium. D) Phosphide. Show Answer Correct Answer: B) Silicon. 4. Describe the band theory of solids. A) The band theory of solids describes the distribution of energy levels in solids, explaining electrical conductivity through the concept of valence and conduction bands. B) The band theory is primarily concerned with the thermal properties of gases. C) The band theory explains the behavior of liquids in terms of molecular interactions. D) The band theory of solids focuses solely on the atomic structure of metals. Show Answer Correct Answer: A) The band theory of solids describes the distribution of energy levels in solids, explaining electrical conductivity through the concept of valence and conduction bands. 5. What are the key characteristics of a transistor when used as an amplifier? A) Key characteristics of a transistor as an amplifier include voltage gain, input/output impedance, operation in the active region, and ability to amplify AC signals. B) Requires no biasing for operation. C) Only suitable for digital signals. D) High thermal resistance. Show Answer Correct Answer: A) Key characteristics of a transistor as an amplifier include voltage gain, input/output impedance, operation in the active region, and ability to amplify AC signals. 6. The voltage at which the PN junctions brraks down and forward current suddenly start flowing is called: A) Reverse breakdown voltage. B) Cut-in Voltage. C) Peak inverse Voltage. D) None of the above. Show Answer Correct Answer: B) Cut-in Voltage. 7. What is the role of photons in semiconductor devices? A) Photons only contribute to the mechanical strength of semiconductor materials. B) Photons enable light absorption and emission, facilitating electrical current generation and light production in semiconductor devices. C) Photons are responsible for heat generation in semiconductors. D) Photons are used to increase the size of semiconductor devices. Show Answer Correct Answer: B) Photons enable light absorption and emission, facilitating electrical current generation and light production in semiconductor devices. 8. What was a significant factor in the transition from vacuum tubes to semiconductors? A) Advances in vacuum technology. B) Advances in solid-state physics. C) Increased size of devices. D) Higher power requirements. Show Answer Correct Answer: B) Advances in solid-state physics. 9. A semiconductor contains donor impurity atoms is callled as ..... semiconductor A) N-type. B) P-type. C) Intrinsic. D) Electron. Show Answer Correct Answer: A) N-type. 10. What is the band gap in semiconductors? A) The temperature at which a semiconductor becomes conductive. B) The amount of current that can flow through a semiconductor. C) Energy difference between the valence band and the conduction band. D) The distance between two neighboring bands in a semiconductor. Show Answer Correct Answer: C) Energy difference between the valence band and the conduction band. 11. Transistors act like tiny " ..... " A) Electron sources. B) Switches. C) Batteries. D) Bees?. Show Answer Correct Answer: B) Switches. 12. In a three-phase motor drive system, how are semiconductors used? A) They help in mechanical alignment. B) They act as thermal insulators. C) They regulate voltage and current through switching devices like IGBTs. D) They increase the physical size of the motor. Show Answer Correct Answer: C) They regulate voltage and current through switching devices like IGBTs. 13. What was the first semiconductor device used in early radios? A) Crystal detector. B) Transistor. C) Vacuum tube. D) Integrated circuit. Show Answer Correct Answer: A) Crystal detector. 14. Heavily doped diode.2. Thin depletion region. 3. Sharp break down voltage All these are characteristics of which diode? A) PN diode. B) Zener Diode. C) Reversed biased diode. D) None of the above. Show Answer Correct Answer: B) Zener Diode. 15. In shunt voltage regulator transistor and zener diode are placed A) Parallel connection. B) Series connection. C) All the above. D) None of the above. Show Answer Correct Answer: A) Parallel connection. 16. How can diodes be used in protection circuits? A) Diodes protect circuits by preventing reverse polarity, clamping voltage spikes, and shunting excess voltage. B) Diodes increase current flow in circuits. C) Diodes are used to amplify signals in circuits. D) Diodes convert AC to DC in protection circuits. Show Answer Correct Answer: A) Diodes protect circuits by preventing reverse polarity, clamping voltage spikes, and shunting excess voltage. 17. What happens to electrons in semiconductors at absolute zero? A) They flow freely. B) They are bound to atoms. C) They are absent. D) They conduct electricity. Show Answer Correct Answer: B) They are bound to atoms. 18. How do diodes function in the rectification process? A) Diodes store electrical energy for later use in rectification. B) Diodes convert DC to AC in the rectification process. C) Diodes function by allowing current to flow in one direction, converting AC to DC in the rectification process. D) Diodes allow current to flow in both directions during rectification. Show Answer Correct Answer: C) Diodes function by allowing current to flow in one direction, converting AC to DC in the rectification process. 19. Which of the following has very low conductivity? A) Copper. B) Silicon. C) Glass. D) Germanium. Show Answer Correct Answer: C) Glass. 20. Explain the working of a P-N junction in semiconductors. A) The P-N junction only allows for one direction of current flow in semiconductors. B) The P-N junction increases resistance in semiconductors. C) The P-N junction allows for the control of current flow in semiconductors by using the built-in electric field to regulate the movement of charge carriers. D) The P-N junction has no effect on current flow in semiconductors. Show Answer Correct Answer: C) The P-N junction allows for the control of current flow in semiconductors by using the built-in electric field to regulate the movement of charge carriers. 21. The energy band in which free electrons exist is the A) First band. B) Second band. C) Conductive band. D) Valence band. Show Answer Correct Answer: C) Conductive band. 22. Where can semiconductors be found? A) Only in smartphones and computers. B) Only in scientific laboratories. C) In solar panels and electric cars as well. D) Exclusively in gaming consoles. Show Answer Correct Answer: C) In solar panels and electric cars as well. 23. Explain the term 'quantum efficiency' in photonics. A) Quantum efficiency is the measure of how effectively a photonic device converts absorbed photons into charge carriers. B) Quantum efficiency refers to the total energy output of a photonic device. C) Quantum efficiency measures the temperature of a photonic device during operation. D) Quantum efficiency is the speed at which photons are emitted from a source. Show Answer Correct Answer: A) Quantum efficiency is the measure of how effectively a photonic device converts absorbed photons into charge carriers. 24. When a pentavalent impurity is added to a pure semiconductor, it becomes ..... A) An insulator. B) An intrinsic semiconductor. C) P-type semiconductor. D) N-type semiconductor. Show Answer Correct Answer: D) N-type semiconductor. 25. Potential barrier developed in a junction diode opposes the flow of A) Minority carrier in both regions only. B) Majority carriers only. C) Majority carriers only. D) Holes in p region. Show Answer Correct Answer: B) Majority carriers only. ← 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