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 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part Ii) Chapter 14 Semiconductor Electronics Materials Quiz 1 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. At absolute zero, Si acts as a A) Non of these. B) Semiconductor. C) Conductor. D) Insulator. Show Answer Correct Answer: D) Insulator. 2. These are the characteristics of pentavalent impurities except A) *contributing extra free electrons. B) *produce n-type semiconductors. C) *produce p-type semiconductors. D) *5 valence electron. Show Answer Correct Answer: C) *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) Integrated circuits are made entirely of metals. B) Integrated circuits are built using semiconductor materials, enabling their functionality. C) Integrated circuits do not require any materials to function. D) Semiconductors are used only in solar panels, not in integrated circuits. Show Answer Correct Answer: B) 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) Silicon. C) Cooper. D) Carbon. Show Answer Correct Answer: B) 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) Semiconductors. B) Super insulators. C) Conductors. D) Insulators. Show Answer Correct Answer: C) Conductors. 12. Direct band semiconductors are used to make A) Diode. B) Integrated circuits. C) Transisters. D) LED, Laser diodes. Show Answer Correct Answer: D) 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) Plastic. B) Conductor. C) Semiconductor. D) Insulator. Show Answer Correct Answer: B) Conductor. 15. What is the function of transistors in earphones? A) To convert music into electricity. B) To store music. C) To decrease the sound quality. D) To amplify the sound signals. Show Answer Correct Answer: D) To amplify the sound signals. 16. Which of the following is NOT an example of a modern electronic device that relies on semiconductors? A) Transistors. B) Integrated Circuits. C) Vacuum Tubes. D) Diodes. 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) Positively. B) Negatively. C) Current. D) Voltage. Show Answer Correct Answer: A) 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) Contactors. B) Grounding rods. C) Circuit breakers. D) VFD. Show Answer Correct Answer: D) 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. 26. When a P-type semiconductor is suitably joined to an N-type semiconductor, then resulting arrangement iscalled ..... A) Inductor. B) Transistor. C) P-N junction. D) Resistance. Show Answer Correct Answer: C) P-N junction. 27. What type of semiconductor device is used to control high-power AC loads? A) Resistor. B) Transformer. C) Thyristor (SCR). D) Diode. Show Answer Correct Answer: C) Thyristor (SCR). 28. Describe the impact of temperature on semiconductor behavior. A) Lower temperatures increase mobility without affecting conductivity. B) Higher temperatures decrease carrier concentration, reducing conductivity. C) Temperature has no effect on semiconductor behavior. D) Higher temperatures increase carrier concentration in semiconductors, enhancing conductivity, but may reduce mobility due to increased scattering. Show Answer Correct Answer: D) Higher temperatures increase carrier concentration in semiconductors, enhancing conductivity, but may reduce mobility due to increased scattering. 29. The minority carriers in P-type silicon are called ..... A) Proton. B) Neutron. C) Electron. D) Hole. Show Answer Correct Answer: C) Electron. 30. Which of the following statements is NOT the diode application in electronic circuit? A) Diode as voltage regulator. B) Diode as Rectifier. C) Diode as Amplifier. D) None of the above. Show Answer Correct Answer: C) Diode as Amplifier. 31. How do transistors differ from diodes in electronic circuits? A) Transistors control current flow while diodes provide resistance. B) Transistors store data while diodes amplify signals. C) Transistors emit light while diodes amplify signals. D) Transistors amplify signals while diodes regulate voltage. Show Answer Correct Answer: D) Transistors amplify signals while diodes regulate voltage. 32. What happen in the N region, when the doping in the P region is high? A) Depletion layer will more toward P region. B) Depletion layer will more toward N region. C) Depletion layer remain unchanged. D) None of the answer. Show Answer Correct Answer: B) Depletion layer will more toward N region. 33. Explain the working principle of a semiconductor transistor. A) A semiconductor transistor works by using a small current to control a larger current. B) A semiconductor transistor works by converting sound waves into electrical signals. C) A semiconductor transistor works by emitting light when a current is applied. D) A semiconductor transistor works by using water to control the flow of electricity. Show Answer Correct Answer: A) A semiconductor transistor works by using a small current to control a larger current. 34. Conductivity of semiconductor increases with increase in temperature, because A) Number density of free charge carriers increases. B) Relaxation time increases. C) Both number density of free charge carriers and relaxation time increases. D) Number density of free charge carriers increases relaxation time decreases but effect of decrease in relaxation time is much less than increase in number density. Show Answer Correct Answer: D) Number density of free charge carriers increases relaxation time decreases but effect of decrease in relaxation time is much less than increase in number density. 35. How do semiconductors contribute to renewable energy technologies? A) Semiconductors are primarily used for thermal insulation in renewable energy systems. B) Semiconductors enable efficient energy conversion and management in solar cells, inverters, and energy storage systems. C) Semiconductors are only relevant in fossil fuel technologies. D) Semiconductors have no impact on energy efficiency in renewable energy applications. Show Answer Correct Answer: B) Semiconductors enable efficient energy conversion and management in solar cells, inverters, and energy storage systems. 36. Which of the following is a pentavalent impurity added while forming an extrinsic semiconductor? A) Boron. B) Arsenic. C) Indium. D) Gallium. Show Answer Correct Answer: B) Arsenic. 37. In reversed biased diode the depletion region acts like an insulator while P-and N-type regions on either sides acts like plates of capacitor, then the junction capacitance formed is called ..... ? A) Diffusion Capacitance C$_{D}$. B) Depletion Region or Transition Capacitance C$_{T.}$. C) All the above. D) None of the above. Show Answer Correct Answer: B) Depletion Region or Transition Capacitance C$_{T.}$. 38. In a forward biased diode, electrons cross the junction and fall into holes. As the electrons fall into the valence band, they radiate energy. In a rectifier diode, this energy is dissipated as heat. However, in the ..... , the energy is dissipated as light. A) Zener diode. B) Light-emitting diode. C) Germanium diode. D) None of the above. Show Answer Correct Answer: B) Light-emitting diode. 39. Explain the concept of a PN junction. A) A PN junction is a layer of insulator that prevents current flow. B) A PN junction is a boundary between p-type and n-type semiconductors that allows current to flow in one direction. C) A PN junction is a type of diode that can conduct in both directions. D) A PN junction is formed by combining two metals to create a conductive path. Show Answer Correct Answer: B) A PN junction is a boundary between p-type and n-type semiconductors that allows current to flow in one direction. 40. Which is one of the properties of semiconductor? A) Atoms vibrate causes electron to break free from the bonds. B) Semiconductor has 2 types of charge carriers. C) Semiconductors can be pure element such as silicon or germanium. D) 4 electrons in outermost orbit, in covalent bonding. Show Answer Correct Answer: C) Semiconductors can be pure element such as silicon or germanium. 41. Which of the following is a compound semiconductor? A) Copper (Cu). B) Gallium Arsenide (GaAs). C) Silicon (Si). D) Germanium (Ge). Show Answer Correct Answer: B) Gallium Arsenide (GaAs). 42. What type of materials support a generous flow of charge when a voltage is applied? A) Conductors. B) Doping materials. C) Semiconductors. D) Insulators. Show Answer Correct Answer: A) Conductors. 43. What is the main idea of semiconductor physics according to the text? A) Study of materials between insulators and conductors. B) Study of insulators. C) Study of conductors. D) Study of resistivity. Show Answer Correct Answer: A) Study of materials between insulators and conductors. 44. ..... (sometimes called "breakdown diodes" ) are designed so that they break down (allow current to pass) when the circuit potential is equal to or in excess of the desired reverse bias voltage. A) Germanium diodes. B) Power rectifier diodes. C) Zener diodes. D) None of the above. Show Answer Correct Answer: C) Zener diodes. 45. A material that conducts electricity well tends to have ..... A) No valence electrons. B) Partially filled bands. C) Completely filled bands. D) Conduction and valence bands that are far apart. Show Answer Correct Answer: B) Partially filled bands. 46. A half-wave rectifier permits current to pass through when alternating current is on the ..... alternation(s) of each cycle. A) Positive. B) Negative. C) Positive and negative. D) Neutral. Show Answer Correct Answer: A) Positive. 47. When the doping level in a crystal diode is increased, the width of the depletion layer is ..... A) Remains the same. B) Decreased. C) Increased. D) None of the answer. Show Answer Correct Answer: C) Increased. 48. Wolfgang Pauli formulated the law stating that ..... electrons can have the same set of quantum numbers. A) Only two. B) No one. C) Only one. D) No two. Show Answer Correct Answer: D) No two. 49. Semiconductor manufacturing company A) Boat. B) Redmi. C) Apple. D) Micron. Show Answer Correct Answer: D) Micron. 50. The majority charge carriers in N-Type semiconductor is: A) Hole. B) Electron. C) All the above. D) None of the above. Show Answer Correct Answer: B) Electron. 51. What is the role of diodes in electronic devices? A) To increase the device's weight. B) To let electricity flow in both directions. C) To only let electricity flow in one direction. D) To store electricity. Show Answer Correct Answer: C) To only let electricity flow in one direction. 52. One function of the transistor is to ..... ? A) Rectify. B) Amplify. C) Limit. D) Control. Show Answer Correct Answer: B) Amplify. 53. What year marked the invention of the transistor? A) 1930. B) 1945. C) 1948. D) 1950. Show Answer Correct Answer: C) 1948. 54. What is the difference between ideal and real diodes? A) Ideal diodes have a forward voltage drop, while real diodes do not. B) Real diodes have no resistance, while ideal diodes have a reverse leakage current. C) Ideal diodes can conduct in both directions, while real diodes can only conduct in one direction. D) Ideal diodes have no resistance or leakage, while real diodes have a forward voltage drop and reverse leakage current. Show Answer Correct Answer: D) Ideal diodes have no resistance or leakage, while real diodes have a forward voltage drop and reverse leakage current. 55. When an atom donates one of its valence electron, then it becomes A) Positive Immobile ion. B) Negative Immobile Ion. C) All the above. D) None of the above. Show Answer Correct Answer: A) Positive Immobile ion. 56. What is the significance of the band gap in semiconductors? A) It determines the color of the semiconductor. B) It determines the energy required for electrons to move from the valence band to the conduction band. C) It affects the thermal conductivity of the material. D) It indicates the maximum temperature the semiconductor can withstand. Show Answer Correct Answer: B) It determines the energy required for electrons to move from the valence band to the conduction band. 57. Which of the following is an example of an organic semiconductor? A) Copper. B) Silicon. C) Anthracene. D) Gallium Arsenide. Show Answer Correct Answer: C) Anthracene. 58. The brakdown that occurs due to Ionization by an Electric Field below reverse voltage of even 5 volt is called: A) Avalanche Breakdown. B) Zener Breakdown. C) All the above. D) None of the above. Show Answer Correct Answer: B) Zener Breakdown. 59. ..... is an injection laser. A) Solid state laser. B) Molecular gas laser. C) Semiconductor laser. D) He-Ne laser. Show Answer Correct Answer: C) Semiconductor laser. 60. What are the 3 legs of a transistor called? A) Brake, Collection, Emit. B) Base, Collector, Emitter. C) Base, Electrode, Commiter. D) Bridge, Collector, Extruder. Show Answer Correct Answer: B) Base, Collector, Emitter. 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