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 2 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part Ii) Chapter 14 Semiconductor Electronics Materials Quiz 2 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What is the significance of the depletion region in a semiconductor? A) The depletion region is significant because it creates an electric field that controls current flow in semiconductor devices. B) The depletion region is where electrons are generated in a semiconductor. C) The depletion region has no effect on the performance of semiconductor devices. D) The depletion region increases conductivity in semiconductors. Show Answer Correct Answer: A) The depletion region is significant because it creates an electric field that controls current flow in semiconductor devices. 2. A pure semiconductor behaves like an insulator at 0 K because A) There is no recombination of electrons with holes. B) Drift velocity of free electrons is very small. C) Free electrons are not available for current conduction. D) Energy possessed by electrons at that low temperature is almost zero. Show Answer Correct Answer: C) Free electrons are not available for current conduction. 3. What is the significance of the forward voltage drop in a diode? A) It indicates the maximum voltage a diode can withstand. B) It determines the resistance of the diode when reverse biased. C) It measures the current flowing through the diode. D) The forward voltage drop indicates the minimum voltage needed for a diode to conduct current. Show Answer Correct Answer: D) The forward voltage drop indicates the minimum voltage needed for a diode to conduct current. 4. A Diode has ..... A) Two pn junction. B) One pn junction. C) Three pn junction. D) None of the above. Show Answer Correct Answer: B) One pn junction. 5. How many valence electrons does semiconductors have? A) 4. B) 8. C) 2. D) 0. Show Answer Correct Answer: A) 4. 6. BJTs and IGBTs generate low on-state conduction power losses. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 7. What is a key benefit of semiconductors over vacuum tubes? A) High voltage operation. B) Require vacuum. C) High power consumption. D) Long lifespan. Show Answer Correct Answer: D) Long lifespan. 8. What unique ability do semiconductors have? A) They can conduct electricity as well as metals. B) They are as bad at conducting electricity as insulators. C) They can only conduct electricity in a vacuum. D) They have the unique ability to control electricity. Show Answer Correct Answer: D) They have the unique ability to control electricity. 9. A full-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: C) Positive and negative. 10. The current in a semiconductor is produced by A) Electron only. B) Holes only. C) Negative ions. D) Both electrons and holes. Show Answer Correct Answer: D) Both electrons and holes. 11. Explain the function of a transistor in electronic circuits. A) A transistor functions as a switch or amplifier in electronic circuits. B) A transistor converts AC to DC in electronic circuits. C) A transistor stores electrical energy in circuits. D) A transistor acts as a resistor in electronic circuits. Show Answer Correct Answer: A) A transistor functions as a switch or amplifier in electronic circuits. 12. Material that has free "holes" instead of electrons is what type of silicon? A) Z-type. B) H-type. C) P-type. D) N-type. Show Answer Correct Answer: C) P-type. 13. Which of the following is a material that does NOT allow current to easily flow through it? A) Silicon. B) Conductor. C) Semiconductor. D) Insulator. Show Answer Correct Answer: D) Insulator. 14. What is the meaning of rectification? A) A process of smoothing using a capacitor. B) A process of adding impurities to pure materials. C) A process of converting an alternating current into a direct current by using a diode. D) None of the above. Show Answer Correct Answer: C) A process of converting an alternating current into a direct current by using a diode. 15. Holes in n-type materials are called A) Majority carrier. B) Diffusion current. C) Hole current. D) Minority carrier. Show Answer Correct Answer: D) Minority carrier. 16. What is the main application of semiconductor materials in solar energy conversion? A) Extracting Geothermal Energy. B) Producing Biofuels. C) Generating Wind Energy. D) Converting Sunlight to Electricity. Show Answer Correct Answer: D) Converting Sunlight to Electricity. 17. The characteristics of p-type semiconductors is includes A) Has tendency to donor electron. B) Easy to conduct electricity. C) Has tendency to gain electron. D) Majority carriers are holes. Show Answer Correct Answer: D) Majority carriers are holes. 18. Pumping technique employed in semiconductor laser is ..... A) Chemicla reaction. B) Direct conversion. C) Optical pumping. D) Electrical discharge method. Show Answer Correct Answer: B) Direct conversion. 19. What is the primary characteristic of insulators? A) Absence of free charge carriers. B) High conductivity. C) Presence of free electrons. D) Intermediate conductivity. Show Answer Correct Answer: A) Absence of free charge carriers. 20. Active medium in semiconductor laser is A) Helium. B) P-N junction diode. C) Neon. D) CO$_{2}$. Show Answer Correct Answer: B) P-N junction diode. 21. At room temperature, an intrinsic semiconductor has ..... A) Many holes only. B) A few free electrons and holes. C) Many free electrons only. D) No holes or free electrons. Show Answer Correct Answer: B) A few free electrons and holes. 22. How is conduction increased in an p-type semiconductor? A) By the availability of donor electrons. B) By increased applied electrical field. C) By decreased applied electrical field. D) By the availability of extra holes. Show Answer Correct Answer: D) By the availability of extra holes. 23. How does a Zener diode differ from a regular diode? A) A Zener diode allows reverse current at a specific voltage, while a regular diode only allows forward current. B) A Zener diode can be used as a rectifier, while a regular diode cannot. C) A Zener diode has a higher forward voltage drop than a regular diode. D) A Zener diode only allows current in one direction, like a regular diode. Show Answer Correct Answer: A) A Zener diode allows reverse current at a specific voltage, while a regular diode only allows forward current. 24. A ..... is a filter that passes high frequencies well, but attenuates (reduces) frequencies lower than the cutoff frequency. A) High-pass filter (HPF). B) Low-pass filter. C) Band-pass filter. D) None of the above. Show Answer Correct Answer: A) High-pass filter (HPF). 25. A diode whose holes and free electrons are drawnaway from each other is ..... A) Given a net positive charge. B) Given a net negative charge. C) Reverse-biased. D) Converted to a transistor. E) Forward-biased. Show Answer Correct Answer: C) Reverse-biased. 26. What is a semiconductor laser? A) A semiconductor laser is a type of LED that emits light when powered. B) A semiconductor laser is a device that converts electrical energy into thermal energy. C) A semiconductor laser is a laser that uses gas as the gain medium. D) A semiconductor laser is a laser that uses a semiconductor as the gain medium to produce coherent light. Show Answer Correct Answer: D) A semiconductor laser is a laser that uses a semiconductor as the gain medium to produce coherent light. 27. How do p-n junctions work? A) P-n junctions allow current to flow in both directions regardless of biasing. B) P-n junctions are used to create magnetic fields in semiconductors. C) P-n junctions work by creating a depletion zone at the interface of p-type and n-type semiconductors, allowing current to flow in one direction when forward biased. D) P-n junctions operate by mixing p-type and n-type materials to form a superconductor. Show Answer Correct Answer: C) P-n junctions work by creating a depletion zone at the interface of p-type and n-type semiconductors, allowing current to flow in one direction when forward biased. 28. ..... occurs when the force produced by the electric field and the force produced by the density gradient exactly balance. A) Built-in potential barrier. B) Depletion. C) Thermal equilibrium. D) PN Junction. Show Answer Correct Answer: C) Thermal equilibrium. 29. A transistor is said to be in active region, when A) BE junction forward biased and BC junction reversed biased. B) BE junction forward biased and BC junction forward biased. C) BE junction reverse biased and BC junction reversed biased. D) None of above. Show Answer Correct Answer: A) BE junction forward biased and BC junction reversed biased. 30. Name two common dopants used in n-type semiconductors. A) Indium. B) Boron. C) Phosphorus, Arsenic. D) Gallium. Show Answer Correct Answer: C) Phosphorus, Arsenic. 31. If the energy of a photon of sodium light (A = 589 nm) equals the band gap of semiconductor, the minimum energy required to create hole electron pair A) 1.5 eV. B) 1.1 eV. C) 3.2 eV. D) 2.1 eV. Show Answer Correct Answer: D) 2.1 eV. 32. What are materials classified based on? A) Electrical conductivity. B) Size. C) Color. D) Weight. Show Answer Correct Answer: A) Electrical conductivity. 33. The reverse saturation current in a PN Junction diode is only due to A) Donor ions. B) Acceptor ions. C) Minority carriers. D) Majority carriers. Show Answer Correct Answer: C) Minority carriers. 34. Where are depletion layers formed? A) In silicon chips. B) On the ends of diodes. C) Where the current is strongest. D) At boundaries between p and n-type regions of a diode. E) At boundaries between p and p-type regions of a diode. Show Answer Correct Answer: D) At boundaries between p and n-type regions of a diode. 35. The wavelength of the emitted radiations depends upon the ..... in GaAs A) Refractive Index. B) Band gap, concentration of donor and acceptor atoms. C) Current. D) Resistance. Show Answer Correct Answer: B) Band gap, concentration of donor and acceptor atoms. 36. Who contribute to the current in a semiconductor A) Electrons only. B) Holes only. C) Negative ions. D) Both electrons and holes. Show Answer Correct Answer: D) Both electrons and holes. 37. Semiconductors behave as insulator state at condition A) Valence band remains full, the conduction band is emptyat low temperature. B) Some of the valence electrons acquire thermal energy greater than energy acquired in forbidden band gap. C) Conducting electrons becomes slightly conducting. D) Insulators become slightly conducting. Show Answer Correct Answer: A) Valence band remains full, the conduction band is emptyat low temperature. 38. A reverse-bias diode acts as a very high-value ..... A) Resistor. B) Transistor. C) Battery. D) Switch. E) Semiconductor. Show Answer Correct Answer: A) Resistor. 39. Explain the concept of forward biasing in a PN junction. A) Forward biasing increases the resistance of the junction. B) Forward biasing allows current to flow through the junction. C) Forward biasing turns the junction into an insulator. D) Forward biasing generates heat in the junction. Show Answer Correct Answer: B) Forward biasing allows current to flow through the junction. 40. What is the difference between a half-wave and full-wave rectifier? A) A half-wave rectifier is more efficient than a full-wave rectifier. B) A half-wave rectifier requires a transformer, while a full-wave rectifier does not. C) A half-wave rectifier converts AC to DC, while a full-wave rectifier does not. D) A half-wave rectifier uses only one half of the AC signal, while a full-wave rectifier uses both halves. Show Answer Correct Answer: D) A half-wave rectifier uses only one half of the AC signal, while a full-wave rectifier uses both halves. 41. The term bias in electronics usually means ..... A) The value of ac voltage in the signal. B) The condition of current through a pn junction. C) The value of dc voltages for the device to operate properly. D) None of the above. Show Answer Correct Answer: C) The value of dc voltages for the device to operate properly. 42. The output voltage for Series voltage regulator is A) Summation of zener and trasistor voltage. B) Subtraction of transistor from zener voltage. C) Subtraction of zener from transistor voltage. D) None of the above. Show Answer Correct Answer: B) Subtraction of transistor from zener voltage. 43. Materials which can conduct electricity better than insulator, but not as well as conductors. This is the definition of A) Superconductor. B) Insulator. C) Semiconductor. D) Conductor. E) Diode. Show Answer Correct Answer: C) Semiconductor. 44. In order to create higher current, solar cells are connected in ..... A) Inverters. B) Series. C) Parallel. D) Wires. Show Answer Correct Answer: C) Parallel. 45. Explain the process of doping in semiconductors. A) Doping involves adding water to semiconductors. B) Doping is the removal of impurities from semiconductors. C) Doping is a process of increasing the temperature of semiconductors. D) Doping in semiconductors is the intentional introduction of impurities into the crystal structure to alter its electrical properties. Show Answer Correct Answer: D) Doping in semiconductors is the intentional introduction of impurities into the crystal structure to alter its electrical properties. 46. The potential difference created across the P-N junction due to the diffusion of electrons and holes is called ..... A) Potential barrier. B) Back emf. C) Instantaneous speed. D) None of the above. Show Answer Correct Answer: A) Potential barrier. 47. The region on either side of the junction which becomes free from the mobile charge carriers is called A) Diffusion region. B) Energy gap region. C) Charge free region. D) Depletion region. Show Answer Correct Answer: D) Depletion region. 48. What is the term for the object that is in between a conductor and an insulator? A) Semiconductor. B) Insulator. C) Conductor. D) Brass. Show Answer Correct Answer: A) Semiconductor. 49. Explain the concept of reverse bias in a diode. A) Reverse bias allows current to flow freely through the diode. B) Reverse bias in a diode is when the voltage is applied in the opposite direction, widening the depletion region and preventing current flow. C) Reverse bias increases the conductivity of the diode. D) Reverse bias occurs when the diode is connected in parallel with the power source. Show Answer Correct Answer: B) Reverse bias in a diode is when the voltage is applied in the opposite direction, widening the depletion region and preventing current flow. 50. How do transistors work in a flashlight? A) They amplify sound to make the flashlight brighter. B) They let electricity flow to light up the bulb. C) They change the color of the light emitted by the bulb. D) They store energy for later use in the flashlight. Show Answer Correct Answer: B) They let electricity flow to light up the bulb. 51. Explain the concept of photonics. A) Photonics is the technology of manipulating matter at the atomic level. B) Photonics is the science and technology of photons, focusing on their generation, manipulation, and detection. C) Photonics deals exclusively with electrical signals and circuits. D) Photonics is the study of sound waves and their applications. Show Answer Correct Answer: B) Photonics is the science and technology of photons, focusing on their generation, manipulation, and detection. 52. Trivalent impurity have ..... no of valence electrons A) 5. B) 4. C) 3. D) None of the above. Show Answer Correct Answer: C) 3. 53. Describe the characteristics of a P-N junction diode. A) A P-N junction diode has the ability to conduct current in both directions. B) A P-N junction diode does not exhibit any bias behavior. C) A P-N junction diode has the ability to conduct current in one direction, exhibits forward and reverse bias behavior, and is commonly used in rectification and switching circuits. D) A P-N junction diode is commonly used in amplification circuits. Show Answer Correct Answer: C) A P-N junction diode has the ability to conduct current in one direction, exhibits forward and reverse bias behavior, and is commonly used in rectification and switching circuits. 54. Name two common semiconductor materials. A) Silicon and Germanium. B) Carbon and Oxygen. C) Aluminum and Copper. D) Gold and Silver. Show Answer Correct Answer: A) Silicon and Germanium. 55. In n-type doping, what is created in the material to contribute to its conductivity? A) Electrons. B) Neutrons. C) Photons. D) Protons. Show Answer Correct Answer: A) Electrons. 56. In p-type material, majority carriers are A) Electrons. B) Electricity. C) Current. D) Holes. Show Answer Correct Answer: D) Holes. 57. The battery connections required to forward bias a pn junction are ..... A) +ve terminal to p and-ve terminal to n. B) -ve terminal to p and +ve terminal to n. C) -ve terminal to p and-ve terminal to n. D) None of the above. Show Answer Correct Answer: A) +ve terminal to p and-ve terminal to n. 58. Semiconductor material doped with pentavalent impurity is called A) Negative type. B) P-type. C) N-type. D) Positive type. Show Answer Correct Answer: C) N-type. 59. N an unbiased p-n junction, holes diffuse from the p-region to n-region because A) Free electrons in the n-region attract them. B) They move across the junction by the potential difference. C) Hole concentration in p-region is more as compared to u-region. D) All of these. Show Answer Correct Answer: C) Hole concentration in p-region is more as compared to u-region. 60. What happens when a PN junction is forward-biased? A) The junction becomes an insulator. B) Current flows through the junction. C) No current flows through the junction. D) The junction heats up significantly. Show Answer Correct Answer: B) Current flows through the junction. ← 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 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 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