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 4 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part Ii) Chapter 14 Semiconductor Electronics Materials Quiz 4 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What is the function of a diode? A) Acts as a current amplifier. B) Acts as an automatic switch. C) Stores electric charge. D) Allows the current to pass in one direction only. Show Answer Correct Answer: D) Allows the current to pass in one direction only. 2. What are the applications of light-emitting diodes (LEDs)? A) LEDs are only used in high-end audio equipment. B) LEDs are mainly found in traditional incandescent bulbs. C) LEDs are primarily used for solar energy generation. D) LEDs are used in general lighting, display screens, indicator lights, automotive lighting, traffic signals, and decorative lighting. Show Answer Correct Answer: D) LEDs are used in general lighting, display screens, indicator lights, automotive lighting, traffic signals, and decorative lighting. 3. Electrons from valence band rises to conduction band when the temperature is greater than 0 k. Is it True or False? A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 4. How do light-emitting diodes (LEDs) work? A) LEDs produce light by reflecting sunlight off a surface. B) LEDs work by heating a metal filament until it glows. C) LEDs generate light through chemical reactions in batteries. D) LEDs emit light when an electric current flows through a semiconductor, causing electron-hole recombination and photon emission. Show Answer Correct Answer: D) LEDs emit light when an electric current flows through a semiconductor, causing electron-hole recombination and photon emission. 5. What is the relationship between current and voltage in a transistor amplifier? A) The current is proportional to the voltage applied at the input, allowing for amplification in a transistor amplifier. B) Voltage is always higher than current in a transistor amplifier. C) Current is independent of voltage in a transistor amplifier. D) Current and voltage are inversely related in a transistor amplifier. Show Answer Correct Answer: A) The current is proportional to the voltage applied at the input, allowing for amplification in a transistor amplifier. 6. In forward biased diode Diffusion capacitance is much larger than Transition Capacitance. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 7. The breakdown which occurs due to Collision in Charge Carriers is called: A) Zener Breakdown. B) Avalanche Bfrreakdown. C) All the above. D) None of the above. Show Answer Correct Answer: B) Avalanche Bfrreakdown. 8. A crystal diode has ..... pn junction. A) One. B) More than four. C) Two. D) Three. Show Answer Correct Answer: A) One. 9. In reverse biasing: A) Potential barrier across junction increases. B) Depletion layer resistance increases. C) In reverse biasing:. D) No current flows. Show Answer Correct Answer: A) Potential barrier across junction increases. 10. Describe the basic structure of a semiconductor diode. A) A semiconductor diode is made of metal and insulator layers. B) A semiconductor diode consists of only n-type material. C) A semiconductor diode has a single type of semiconductor material. D) A semiconductor diode is made of p-type and n-type semiconductor materials forming a p-n junction. Show Answer Correct Answer: D) A semiconductor diode is made of p-type and n-type semiconductor materials forming a p-n junction. 11. What is the process of adding impurities to semiconductors to modify their electrical properties? A) Evaporation. B) Fusion. C) Sublimation. D) Doping. Show Answer Correct Answer: D) Doping. 12. The electric current produced due to the steady flow of electrons in one direction is called A) Drift current. B) Diffusion Current. C) All the above. D) None of the above. Show Answer Correct Answer: A) Drift current. 13. There is a small amount of current across the barrier of a reverse-biased diode. This current is called as A) Conventional current. B) Forward-bias current. C) Reverse breakdown current. D) Reverse leakage current. Show Answer Correct Answer: D) Reverse leakage current. 14. In GaAs semiconductor diode, the band gap of GaAs is 1.44eV. Calculate the wavelength. A) 8400 Angstroms. B) 8200 Angstroms. C) 8628 Angstroms. D) 8000 Angstroms. Show Answer Correct Answer: C) 8628 Angstroms. 15. Which of the following statements is incorrect for the depletion region of a diode? A) There the mobile charges exist. B) Equal number of holes and electrons exist, making the region neutral. C) Recombination of holes and electrons has taken place. D) None of these. Show Answer Correct Answer: A) There the mobile charges exist. 16. What is the process of doping in semiconductors? A) Introducing impurities into a semiconductor to change its electrical properties. B) Removing impurities from a semiconductor to decrease its electrical properties. C) Adding water to a semiconductor to increase its conductivity. D) Heating a semiconductor to change its color. Show Answer Correct Answer: A) Introducing impurities into a semiconductor to change its electrical properties. 17. The process by which small amounts of additives called impurities are added to the semiconductor material to increase their current flow by adding a few electrons or a few holes is known as: A) Doping. B) Contaminating. C) Base modification. D) Enhancing. Show Answer Correct Answer: A) Doping. 18. A pn junction is formed by A) The recombination of electrons and holes. B) Ionization. C) The boudary of a p-type and an n-type material. D) The collision of a proton and a neutron. Show Answer Correct Answer: C) The boudary of a p-type and an n-type material. 19. What impact did the transition to semiconductor devices have on technology? A) Reduced power efficiency. B) Enabled miniaturization. C) Limited applications. D) Increased size of devices. Show Answer Correct Answer: B) Enabled miniaturization. 20. Zener diodes are mostly used for A) Rectifier circuits. B) Solar cells. C) Voltage regulator circuits. D) Filter Circuits. Show Answer Correct Answer: C) Voltage regulator circuits. 21. How did the development of transistors impact the field of electronics? A) Stagnated Progress. B) Enabled Miniaturization. C) Reduced Efficiency. D) Increased Size. Show Answer Correct Answer: B) Enabled Miniaturization. 22. What is the base of the chip where circuits and transistors are printed A) Wafer. B) Truffle. C) Chocolate. D) Chips. Show Answer Correct Answer: A) Wafer. 23. An atom consists of A) One nucleus and only one electron. B) One nucleus and one or more electrons. C) Protons, electrons and neutrons. D) Answer (b) and (c). Show Answer Correct Answer: D) Answer (b) and (c). 24. Describe the switching behavior of a diode. A) A diode can switch between conducting and blocking states rapidly without any bias. B) A diode conducts current in one direction (forward bias) and blocks it in the opposite direction (reverse bias). C) A diode conducts current in both directions equally. D) A diode only blocks current and does not conduct at all. Show Answer Correct Answer: B) A diode conducts current in one direction (forward bias) and blocks it in the opposite direction (reverse bias). 25. According to this theory, free electrons move in a periodic potential provided by the lattice A) Quantum free electron theory. B) Classical free electron theory. C) Free electron theory. D) Zone theory. Show Answer Correct Answer: D) Zone theory. 26. What is the function of diodes in electronic circuits? A) Diodes store data in electronic circuits. B) Diodes regulate voltage in electronic circuits. C) Diodes in electronic circuits primarily function as one-way valves for current flow. D) Diodes amplify signals in electronic circuits. Show Answer Correct Answer: C) Diodes in electronic circuits primarily function as one-way valves for current flow. 27. An n type semiconductor is negatively charged A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 28. What is the band gap in a semiconductor? A) Energy difference between the valence band and conduction band. B) Energy difference between the p-band and n-band. C) Temperature at which the semiconductor operates. D) Number of electrons in the semiconductor. Show Answer Correct Answer: A) Energy difference between the valence band and conduction band. 29. If a small amount of antimony is added to germanium crystal A) Its resistance is increased. B) It becomes a p-type semiconductor. C) There will be more free electrons than holes in the semiconductor,. D) None of these. Show Answer Correct Answer: C) There will be more free electrons than holes in the semiconductor,. 30. Silicon and Germanium are examples: A) Superconductor. B) Conductor. C) Semiconductor. D) Insulator. Show Answer Correct Answer: C) Semiconductor. 31. What is the primary use of silicon in electronics? A) As a dielectric material. B) As a semiconductor material. C) As an insulator material. D) As a conductor material. Show Answer Correct Answer: B) As a semiconductor material. 32. The majority carrier in an n-type semiconductor are A) Valences electrons. B) Holes. C) Protons. D) Conduction electrons. Show Answer Correct Answer: D) Conduction electrons. 33. The breakdown in a reverse biased p-n junction diode is more likely to occur due to A) Large velocity of the minority charge carriers if the doping concentration is small. B) Large velocity of the minority charge carriers if the doping concentration is large. C) Strong electric field in a depletion region if the doping concentration is small. D) None of these. Show Answer Correct Answer: B) Large velocity of the minority charge carriers if the doping concentration is large. 34. What makes semiconductors super useful in electronic devices? A) Their low cost compared to metals. B) Their high thermal conductivity. C) Their ability to emit light efficiently. D) Their unique ability to control electricity. Show Answer Correct Answer: D) Their unique ability to control electricity. 35. Which of the following is NOT a type of vacuum tube? A) Hexode. B) Triode. C) Tetrode. D) Pentode. Show Answer Correct Answer: A) Hexode. 36. Which of the following materials have very low electrical conductivity and a large energy band gap? A) Insulators. B) Semiconductors. C) Superconductors. D) Metals. Show Answer Correct Answer: A) Insulators. 37. The efficiency of a half wave rectifier is A) 40.6%. B) 81.2%. C) 46%. D) 40%. Show Answer Correct Answer: A) 40.6%. 38. Define a semiconductor. A) A material that has electrical conductivity between that of a conductor and an insulator. B) A material that conducts electricity with no resistance. C) A material that does not conduct electricity at all. D) A material that has high thermal conductivity but low electrical conductivity. Show Answer Correct Answer: A) A material that has electrical conductivity between that of a conductor and an insulator. 39. How do LEDs differ from traditional light bulbs? A) LEDs produce light through electroluminescence, while traditional bulbs use incandescence. B) LEDs emit heat instead of light, unlike traditional bulbs. C) LEDs consume more power than traditional bulbs. D) LEDs are less durable compared to traditional bulbs. Show Answer Correct Answer: A) LEDs produce light through electroluminescence, while traditional bulbs use incandescence. 40. The energy band in which free electrons exist is know as A) First band. B) Second band. C) Conductive band. D) Valence band. Show Answer Correct Answer: C) Conductive band. 41. During formation of p-n junction A) A hole diffuses from p to n side. B) A hole diffuses from n to p side. C) An electron diffuses from n to p side. D) An electron diffuses from p to n side. Show Answer Correct Answer: C) An electron diffuses from n to p side. 42. Which of the following acts as a donor impurity in doping process? A) Arsenic. B) Indium. C) Gallium. D) Boron. Show Answer Correct Answer: A) Arsenic. 43. What type of devices emerged from the development of solid-state electronics? A) Only diodes. B) Only integrated circuits. C) Only vacuum tubes. D) Diodes, transistors, and integrated circuits. Show Answer Correct Answer: D) Diodes, transistors, and integrated circuits. 44. In which of the following semiconductor, the concentration of the holes and electrons is equal? A) Extrinsic. B) Compound. C) Intrinsic. D) None. Show Answer Correct Answer: C) Intrinsic. 45. What is the purpose of a Zener diode? A) To store energy. B) To allow current to flow in both directions. C) To provide surge protection. D) To increase current flow. Show Answer Correct Answer: C) To provide surge protection. 46. What is the resistivity of copper compared to mica? A) Copper has higher resistivity. B) Resistivity is not mentioned in the text. C) Mica has higher resistivity. D) Copper and mica have the same resistivity. Show Answer Correct Answer: C) Mica has higher resistivity. 47. What happens to the conductivity of a semiconductor when it is doped with a pentavalent impurity? A) The conductivity of the semiconductor becomes negative. B) The conductivity of the semiconductor remains the same. C) The conductivity of the semiconductor increases. D) The conductivity of the semiconductor decreases. Show Answer Correct Answer: C) The conductivity of the semiconductor increases. 48. Which of the following statements is true regarding semiconductor devices? A) They operate at high voltages. B) They are less reliable than vacuum tubes. C) They are larger than vacuum tubes. D) They do not require external heating. Show Answer Correct Answer: D) They do not require external heating. 49. What is a semiconductor? A) A non-metal with strong covalent bonds that oppose the flow of current. B) A person who directs the performance of an orchestra or choir. C) A substance with an electrical conductivity that can act as either a conductor or an insulator depending on the circumstance. D) None of the above. Show Answer Correct Answer: C) A substance with an electrical conductivity that can act as either a conductor or an insulator depending on the circumstance. 50. When the doping level of a crystal diode is increased, what happen to the breakdown voltage? A) Remain same. B) Decreased. C) Increased. D) None of the answer. Show Answer Correct Answer: B) Decreased. 51. Which among these is NOT a semiconductor A) Germanium. B) Silicon. C) Gallium Arsenide. D) Titanium. Show Answer Correct Answer: D) Titanium. 52. Free electron theory has been developed in ..... main stages A) 2. B) 3. C) 5. D) 1. Show Answer Correct Answer: B) 3. 53. Creation of holes without generating electrons and can be used to control the concentration of holes in semiconductor is the doping process in ..... A) Intrinsic semiconductor. B) N-type semiconductor. C) Insulator. D) P-type semiconductor. Show Answer Correct Answer: D) P-type semiconductor. 54. What is the fundamental study of the properties and behaviors of semiconductor materials? A) Quantum Mechanics. B) Semiconductor Physics. C) Astrophysics. D) Thermodynamics. Show Answer Correct Answer: B) Semiconductor Physics. 55. What is the glass plate (like imaging or for drawing kolam) with microscopic electrical circuits that required for semiconductor photolithography processing called? A) Transistor. B) Silicon wafer. C) Photomask. D) Circuit board. Show Answer Correct Answer: C) Photomask. 56. Component that Convert AC to DC and allow current to flow in one Direction A) Inverter. B) Diode. C) Resistor. D) Capacitor. Show Answer Correct Answer: B) Diode. 57. What materials used in electronics? A) All the answer. B) Insulator. C) Semiconductor. D) Conductor. Show Answer Correct Answer: A) All the answer. 58. What is the role of doping in semiconductors? A) Doping increases the conductivity of semiconductors by introducing charge carriers. B) Doping has no effect on the conductivity of semiconductors. C) Doping decreases the conductivity of semiconductors by removing charge carriers. D) Doping is used to insulate semiconductors from electrical currents. Show Answer Correct Answer: A) Doping increases the conductivity of semiconductors by introducing charge carriers. 59. Which of the following features distinguishes semiconductor devices from vacuum tubes? A) Large size. B) Low voltage operation. C) Fragility. D) High power consumption. Show Answer Correct Answer: B) Low voltage operation. 60. The diode with High level of Doping is called ..... ? A) PN Diode. B) Zener Diode. C) None of the above. D) None of the above. Show Answer Correct Answer: B) Zener Diode. ← 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 3Class 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