This quiz works best with JavaScript enabled. Home > Cbse > Class 12 > Science > Physics Part Ii > Class 12 Physics (Part Ii) Chapter 14 Semiconductor Electronics Materials – Quiz 3 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part Ii) Chapter 14 Semiconductor Electronics Materials Quiz 3 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Explain the concept of biasing in transistors. A) Biasing in transistors is the process of applying an AC voltage to increase current flow. B) Biasing in transistors is the method of cooling transistors to prevent overheating. C) Biasing in transistors refers to the physical alignment of transistor components. D) Biasing in transistors is the process of applying a DC voltage to set the operating point for optimal performance. Show Answer Correct Answer: D) Biasing in transistors is the process of applying a DC voltage to set the operating point for optimal performance. 2. Which material has no band gap? A) Alloys. B) Conductors. C) Semiconductors. D) Insulators. Show Answer Correct Answer: B) Conductors. 3. The street lights use electronic control system that switches the lights on when the surrounding is dark. What is the input sensor of the control system?Lampu jalan menggunakan sistem kawalan elektronik yang menghidupkan lampu ketika sekitarnya gelap. Apakah sensor input sistem kawalan? A) Light emitting diodeDiod pemancar cahaya. B) MicrophoneMikrofon. C) ThermistorTermistor. D) Light dependent resistorPerintang peka cahaya. Show Answer Correct Answer: D) Light dependent resistorPerintang peka cahaya. 4. What is the role of the p-n junction in a diode? A) The p-n junction allows current to flow in one direction, acting as a rectifier. B) The p-n junction stores electrical energy like a capacitor. C) The p-n junction allows current to flow in both directions. D) The p-n junction amplifies electrical signals. Show Answer Correct Answer: A) The p-n junction allows current to flow in one direction, acting as a rectifier. 5. The three leads of the transistor are: A) Emanator, Base, Collector. B) Emitter, Base, Collector. C) All the above. D) None of the above. Show Answer Correct Answer: B) Emitter, Base, Collector. 6. What are n-type semiconductors? A) Semiconductors that have been doped with elements that provide extra electrons. B) Semiconductors that have been doped with elements that create holes. C) Semiconductors that are pure and have no doping. D) Semiconductors that conduct electricity only at high temperatures. Show Answer Correct Answer: A) Semiconductors that have been doped with elements that provide extra electrons. 7. What is a key application of compound semiconductors like GaAs? A) Thermal management. B) Insulation. C) Optoelectronics. D) Power generation. Show Answer Correct Answer: C) Optoelectronics. 8. What is the range of energy levels that an electron can occupy in a material? A) Valence band. B) Conduction band. C) Resistivity. D) Forbidden band gap. Show Answer Correct Answer: A) Valence band. 9. What role does semiconductor physics play in the development of modern electronic devices? A) Supporting Role. B) Crucial Role. C) Minor Role. D) No Role. Show Answer Correct Answer: B) Crucial Role. 10. A simple diode rectifier circuit can convert:I. AC voltage to DC voltage II. DC voltage to AC voltage III. Small AC voltage to a large AC voltage A) I only. B) II only. C) III only. D) I and II only. E) I and III only. Show Answer Correct Answer: A) I only. 11. How does temperature affect the conductivity of N-type and P-type semiconductors? A) Temperature decreases conductivity in N-type semiconductors only. B) Temperature increases conductivity in both N-type and P-type semiconductors. C) Higher temperatures reduce conductivity in both types of semiconductors. D) Temperature has no effect on the conductivity of P-type semiconductors. Show Answer Correct Answer: B) Temperature increases conductivity in both N-type and P-type semiconductors. 12. What is the main advantage of semiconductor devices over vacuum tubes? A) Smaller Size and Weight. B) Lower Noise Level. C) Higher Power Handling. D) Longer Life Span. Show Answer Correct Answer: A) Smaller Size and Weight. 13. Explain the term 'breakdown voltage' in the context of diodes. A) Breakdown voltage is the voltage at which a diode becomes permanently damaged. B) Breakdown voltage refers to the voltage at which a diode stops conducting. C) Breakdown voltage is the maximum forward voltage a diode can handle. D) Breakdown voltage is the reverse voltage at which a diode begins to conduct significantly in reverse. Show Answer Correct Answer: D) Breakdown voltage is the reverse voltage at which a diode begins to conduct significantly in reverse. 14. Diode has polarity A) Anode and cathode. B) On and off. C) Output and input. D) None of the above. Show Answer Correct Answer: A) Anode and cathode. 15. What happens to the resistance of semiconductors as the temperature increases? A) Becomes Zero. B) Increases. C) Remains Constant. D) Decreases. Show Answer Correct Answer: D) Decreases. 16. ..... is a process that uses light to transfer a pattern onto a substrate, such as a silicon wafer, to create integrated circuits, microprocessors, and printed circuit boards A) Photolithography. B) Electroplating. C) Etching. D) Sputtering. Show Answer Correct Answer: A) Photolithography. 17. How many terminals are there in a transistor ..... ? A) 2. B) 3. C) 1. D) 4. Show Answer Correct Answer: B) 3. 18. In a Transistor ..... A) I$_{C}$ = I$_{E}$ + I$_{B}$. B) I$_{B}$ = I$_{C}$ + I$_{E}$. C) I$_{E}$ = I$_{C}$-I$_{B}$. D) I$_{E}$ = I$_{C}$ + I$_{B}$. Show Answer Correct Answer: D) I$_{E}$ = I$_{C}$ + I$_{B}$. 19. Doping is a process of adding a certain amount of specific impurities to semiconductor. What is the purpose of doping? A) To increase the temperature of the semiconductor. B) To increase the thermal energy of semiconductor. C) To increase the conductivity of the semiconductor. D) To increase the resistance of semiconductor. Show Answer Correct Answer: C) To increase the conductivity of the semiconductor. 20. How does a forward-biased PN junction behave? A) Current flows through the junction. B) The junction becomes an insulator. C) No current flows through the junction. D) Voltage flows through the junction. Show Answer Correct Answer: A) Current flows through the junction. 21. In a forward biased PN junction or diode, the negative voltage source is connected to the ..... material. A) Either N-type or P-type. B) Insulating. C) N-type. D) P-type. Show Answer Correct Answer: C) N-type. 22. What is doping in semiconductors? A) The process of adding impurities to a semiconductor to change its electrical properties. B) The method of cooling semiconductors to improve conductivity. C) The technique of layering different semiconductor materials for better performance. D) The process of removing impurities from a semiconductor to enhance its purity. Show Answer Correct Answer: A) The process of adding impurities to a semiconductor to change its electrical properties. 23. How does the doping process affect the electrical properties of a semiconductor? A) Doping increases the mechanical strength of a semiconductor. B) Doping changes the number of charge carriers in a semiconductor, affecting its electrical conductivity. C) Doping decreases the resistance of a semiconductor. D) Doping has no effect on the electrical properties of a semiconductor. Show Answer Correct Answer: B) Doping changes the number of charge carriers in a semiconductor, affecting its electrical conductivity. 24. What is the I-V characteristic curve of a diode? A) The I-V curve of a diode is a straight line regardless of voltage. B) The I-V characteristic curve of a diode shows a steep rise in current after a threshold voltage in forward bias and a small reverse current until breakdown in reverse bias. C) The I-V characteristic curve shows no current flow in either direction. D) Diodes conduct current equally in both forward and reverse bias. Show Answer Correct Answer: B) The I-V characteristic curve of a diode shows a steep rise in current after a threshold voltage in forward bias and a small reverse current until breakdown in reverse bias. 25. Explain the difference between intrinsic and extrinsic semiconductors. A) Intrinsic semiconductors are pure materials, while extrinsic semiconductors are doped with impurities to enhance conductivity. B) Intrinsic semiconductors are always doped with impurities. C) Extrinsic semiconductors are pure materials with no impurities. D) Both intrinsic and extrinsic semiconductors have the same conductivity properties. Show Answer Correct Answer: A) Intrinsic semiconductors are pure materials, while extrinsic semiconductors are doped with impurities to enhance conductivity. 26. What is the conductivity of semiconductors when impurities are added? A) Decreases. B) Increases. C) Becomes Zero. D) Remains Constant. Show Answer Correct Answer: B) Increases. 27. How do diodes protect circuits from voltage spikes? A) Diodes amplify voltage spikes to enhance circuit performance. B) Diodes convert voltage spikes into heat to protect components. C) Diodes store excess voltage for later use in the circuit. D) Diodes protect circuits from voltage spikes by redirecting excess voltage away from sensitive components. Show Answer Correct Answer: D) Diodes protect circuits from voltage spikes by redirecting excess voltage away from sensitive components. 28. 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. 29. 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. 30. What is the function of a rectifier diode in power supply circuits? A) To store energy for later use. B) To amplify the AC signal. C) The function of a rectifier diode in power supply circuits is to convert AC to DC. D) To filter out noise from the circuit. Show Answer Correct Answer: C) The function of a rectifier diode in power supply circuits is to convert AC to DC. 31. 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. 32. What happen to the bias, when the crystal current diode is large? A) Poor. B) Inverse. C) Reverse. D) Forward. Show Answer Correct Answer: D) Forward. 33. ..... 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. 34. Carrier concentration in metals is A) N(E)dE x F(E) dE. B) Z(E)dE. C) ZE x FE. D) Z(E) x F(E) dE. Show Answer Correct Answer: D) Z(E) x F(E) dE. 35. 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. 36. What is the difference between LED and laser diodes? A) LEDs emit incoherent light, while laser diodes emit coherent light. B) Laser diodes consume more power than LEDs. C) LEDs are used for high-intensity applications, while laser diodes are not. D) LEDs are always monochromatic, while laser diodes can emit multiple colors. Show Answer Correct Answer: A) LEDs emit incoherent light, while laser diodes emit coherent light. 37. Give an example of a common semiconductor material. A) Copper. B) Aluminum. C) Silicon. D) Gold. Show Answer Correct Answer: C) Silicon. 38. What can transistors do by controlling the flow of charge carriers between layers? A) Block Current. B) Amplify Signals. C) Generate Heat. D) Create Light. Show Answer Correct Answer: B) Amplify Signals. 39. 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. 40. What is the intentional introduction of impurities into an intrinsic semiconductor for the purpose of modulating its electrical, optical and structural properties? A) Electromagnetic field. B) Impurification. C) Doping. D) Conduction. Show Answer Correct Answer: C) Doping. 41. 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. 42. Which material is most commonly used in semiconductor components? A) Silicon. B) Gold. C) Aluminum. D) Copper. Show Answer Correct Answer: A) Silicon. 43. 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. 44. Transistor has 3 electrodes namely A) NPN. B) PNP. C) Drain/ Gate/ Source. D) Base/ Collector/ Emitter. Show Answer Correct Answer: D) Base/ Collector/ Emitter. 45. We use who's law to help us with circuit calculations? A) Amps. B) Resistance. C) Ohms. D) Volts. Show Answer Correct Answer: C) Ohms. 46. Application of Semiconductors A) Television. B) Mobile. C) Modern Train. D) All of the above. Show Answer Correct Answer: D) All of the above. 47. 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. 48. 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. 49. 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. 50. 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. 51. 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. 52. 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. 53. Semiconductors are made of A) Silicon. B) Gold. C) Germaniam. D) Both a and c. Show Answer Correct Answer: D) Both a and c. 54. 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. 55. The characteristics of p-type semiconductors includes ..... A) Has tendency to gain electron. B) Easy to conduct electricity. C) Majority carriers are electron. D) Has tendency to donor electron. Show Answer Correct Answer: C) Majority carriers are electron. 56. Allows current to flow in only one direction A) Capacitor. B) Resistor. C) Diode. D) LED. Show Answer Correct Answer: C) Diode. 57. Describe the process of rectification in electrical circuits. A) Rectification involves the use of capacitors to store electrical energy. B) Rectification is the conversion of AC to DC using diodes. C) Rectification is the process of converting DC to AC using transformers. D) Rectification is the method of amplifying electrical signals in circuits. Show Answer Correct Answer: B) Rectification is the conversion of AC to DC using diodes. 58. Which of the following has low threshold current density? A) CO$_{2}$ laser. B) He-Ne laser. C) Homojunction laser. D) Heterojunction laser. Show Answer Correct Answer: D) Heterojunction laser. 59. 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. 60. 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. ← PreviousNext →Related QuizzesScience QuizzesClass 12 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 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 10 Wave Optics QuizClass 12 Physics (Part Ii) Chapter 11 Dual Nature Of Radiation And Matter Quiz 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books