This quiz works best with JavaScript enabled. Home > Class 12 > 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 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What is the main application of semiconductor materials in solar energy conversion? A) Generating Wind Energy. B) Converting Sunlight to Electricity. C) Producing Biofuels. D) Extracting Geothermal Energy. Show Answer Correct Answer: B) Converting Sunlight to Electricity. 2. The characteristics of p-type semiconductors is includes A) Majority carriers are holes. B) Has tendency to gain electron. C) Has tendency to donor electron. D) Easy to conduct electricity. Show Answer Correct Answer: A) Majority carriers are holes. 3. Pumping technique employed in semiconductor laser is ..... A) Direct conversion. B) Optical pumping. C) Electrical discharge method. D) Chemicla reaction. Show Answer Correct Answer: A) Direct conversion. 4. What is the primary characteristic of insulators? A) High conductivity. B) Intermediate conductivity. C) Presence of free electrons. D) Absence of free charge carriers. Show Answer Correct Answer: D) Absence of free charge carriers. 5. Active medium in semiconductor laser is A) CO$_{2}$. B) P-N junction diode. C) Helium. D) Neon. Show Answer Correct Answer: B) P-N junction diode. 6. 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. 7. How is conduction increased in an p-type semiconductor? A) By increased applied electrical field. B) By decreased applied electrical field. C) By the availability of extra holes. D) By the availability of donor electrons. Show Answer Correct Answer: C) By the availability of extra holes. 8. 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. 9. 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). 10. A diode whose holes and free electrons are drawnaway from each other is ..... A) Forward-biased. B) Reverse-biased. C) Given a net positive charge. D) Given a net negative charge. E) Converted to a transistor. Show Answer Correct Answer: B) Reverse-biased. 11. 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 laser that uses a semiconductor as the gain medium to produce coherent light. C) A semiconductor laser is a laser that uses gas as the gain medium. D) A semiconductor laser is a device that converts electrical energy into thermal energy. Show Answer Correct Answer: B) A semiconductor laser is a laser that uses a semiconductor as the gain medium to produce coherent light. 12. LED is A) Light Enhancing Diode. B) Light Emitting Diode. C) Light Emitting Detector. D) Light Enhancing Detector. Show Answer Correct Answer: B) Light Emitting Diode. 13. 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. 14. ..... occurs when the force produced by the electric field and the force produced by the density gradient exactly balance. A) Depletion. B) Thermal equilibrium. C) Built-in potential barrier. D) PN Junction. Show Answer Correct Answer: B) Thermal equilibrium. 15. 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. 16. 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. 17. 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) 1.1 eV. B) 2.1 eV. C) 3.2 eV. D) 1.5 eV. Show Answer Correct Answer: B) 2.1 eV. 18. What are materials classified based on? A) Color. B) Electrical conductivity. C) Size. D) Weight. Show Answer Correct Answer: B) Electrical conductivity. 19. The reverse saturation current in a PN Junction diode is only due to A) Majority carriers. B) Minority carriers. C) Acceptor ions. D) Donor ions. Show Answer Correct Answer: B) Minority carriers. 20. 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. 21. 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. 22. 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. 23. 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. 24. A reverse-bias diode acts as a very high-value ..... A) Battery. B) Resistor. C) Switch. D) Transistor. E) Semiconductor. Show Answer Correct Answer: B) Resistor. 25. 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. ← 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 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 10Class 12 Physics (Part Ii) Chapter 14 Semiconductor Electronics Materials Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books