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 7 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part Ii) Chapter 14 Semiconductor Electronics Materials Quiz 7 (38 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Explain the concept of optical fibers in photonics. A) Optical fibers are only used in medical applications and have no data communication role. B) Optical fibers are primarily used for electrical signal transmission. C) Optical fibers are made of metal and conduct electricity. D) Optical fibers are used to transmit light signals through total internal reflection, enabling efficient data communication and various photonic applications. Show Answer Correct Answer: D) Optical fibers are used to transmit light signals through total internal reflection, enabling efficient data communication and various photonic applications. 2. What are p-type semiconductors? A) Semiconductors that have been doped with elements that create 'holes' for electrons to move into. B) Semiconductors that have a high concentration of free electrons. C) Semiconductors that are made entirely of metals. D) Semiconductors that do not conduct electricity at all. Show Answer Correct Answer: A) Semiconductors that have been doped with elements that create 'holes' for electrons to move into. 3. ..... donates an electrons that it free to move. A) Boron. B) Acceptor impurities. C) Donor impurities. D) Atom. Show Answer Correct Answer: C) Donor impurities. 4. What is the function of a transistor? A) To convert AC to DC. B) The function of a transistor is to act as a switch or amplifier. C) To store electrical energy. D) To increase voltage without amplification. Show Answer Correct Answer: B) The function of a transistor is to act as a switch or amplifier. 5. Doping of Semiconductors A) Materials which can conduct electricity better than insulator, but not as well as conductors. B) The process of adding of a certain amount of specific impurities atoms in the pure semiconductor. C) When 4 electrons in outermost orbit. D) None of the above. Show Answer Correct Answer: B) The process of adding of a certain amount of specific impurities atoms in the pure semiconductor. 6. Explain the role of resistors in an electrical circuit. A) Resistors control the flow of current in a circuit by providing resistance to the flow of electrons. B) Resistors amplify the voltage in a circuit to increase power output. C) Resistors store electrical energy for later use in the circuit. D) Resistors convert electrical energy into heat in the circuit. Show Answer Correct Answer: A) Resistors control the flow of current in a circuit by providing resistance to the flow of electrons. 7. Differentiate between bipolar junction transistors (BJTs) and field-effect transistors (FETs). A) BJTs and FETs both use two types of charge carriers. B) BJTs are voltage-controlled devices using both charge carriers. C) BJTs are current-controlled devices using both charge carriers, while FETs are voltage-controlled devices using one type of charge carrier. D) FETs are current-controlled devices using one type of charge carrier. Show Answer Correct Answer: C) BJTs are current-controlled devices using both charge carriers, while FETs are voltage-controlled devices using one type of charge carrier. 8. The phenomenon used in LED is called A) Electro illuminance. B) Electrolence. C) Electro Luminance. D) None of the above. Show Answer Correct Answer: C) Electro Luminance. 9. A p-type semiconductor is: A) Uncharged. B) Positive. C) Negative. D) None of the above. Show Answer Correct Answer: A) Uncharged. 10. Is the element added to the type p semiconductors. A) Boron. B) Antimony. C) Chlorine. D) Argon. Show Answer Correct Answer: A) Boron. 11. In full wave rectifier, input a.c. current has a frequency v. The output frequency of current is: A) V/2. B) V. C) 2V. D) NONE. Show Answer Correct Answer: C) 2V. 12. The battery connections required to reverse 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) +ve terminal to p and +ve terminal to n. Show Answer Correct Answer: B) -ve terminal to p and +ve terminal to n. 13. How do solar cells utilize semiconductor technology? A) Solar cells store electricity in batteries for later use. B) Solar cells convert sunlight into electricity using semiconductor materials that generate electron-hole pairs when exposed to light. C) Solar cells use metal wires to conduct heat from the sun. D) Solar cells rely on fossil fuels to generate power. Show Answer Correct Answer: B) Solar cells convert sunlight into electricity using semiconductor materials that generate electron-hole pairs when exposed to light. 14. Who is the leading manufacturer of Semiconductors in the world A) India. B) China. C) USA. D) Taiwan. Show Answer Correct Answer: D) Taiwan. 15. A Schottky diode conducts high current during ..... with ..... reverse recovery time. A) Reverse-biased; short. B) Reverse-biased; very short. C) Forward-biased; very short. D) Forward-biased; short. Show Answer Correct Answer: C) Forward-biased; very short. 16. What was the primary device used for electron control before 1948? A) Vacuum Tubes. B) Integrated Circuits. C) Transistors. D) Diodes. Show Answer Correct Answer: A) Vacuum Tubes. 17. What type of materials are used extensively in electronics? A) Elemental semiconductors. B) Insulators. C) Organic semiconductors. D) Conductors. Show Answer Correct Answer: A) Elemental semiconductors. 18. Which semiconductor materials are commonly used in electronic devices? A) Silicon and Germanium. B) Gold and Silver. C) Copper and Aluminum. D) Mercury and Steel. Show Answer Correct Answer: A) Silicon and Germanium. 19. Magnitude of current developed during diffusion and drift respectively are A) Micro and mA. B) NA and mA. C) MA and Micro ampere. D) Micro and nA. Show Answer Correct Answer: C) MA and Micro ampere. 20. Discuss the role of PN junctions in rectifying alternating current. A) PN junctions amplify alternating current. B) PN junctions in rectifying alternating current act as diodes, allowing current flow in one direction while blocking it in the opposite direction, thereby converting AC to pulsating DC. C) PN junctions allow current flow in both directions equally. D) PN junctions have no effect on alternating current. Show Answer Correct Answer: B) PN junctions in rectifying alternating current act as diodes, allowing current flow in one direction while blocking it in the opposite direction, thereby converting AC to pulsating DC. 21. Addition of trivalent impurity to a semiconductor creates many ..... A) Bound electrons. B) Free electrons. C) Valence electrons. D) Holes. Show Answer Correct Answer: D) Holes. 22. What is the energy band structure that defines the range of energy levels an electron can occupy? A) Forbidden band gap. B) Conduction band. C) Resistivity. D) Valence band. Show Answer Correct Answer: D) Valence band. 23. The forbidden energy gap for Silicon is of the order of A) 1.1 eV. B) 0.3 eV. C) 10 eV. D) 0.7 eV. Show Answer Correct Answer: A) 1.1 eV. 24. A ..... is a device that transforms AC into DC by limiting or regulating the direction of current flow. A) Rectifier. B) Transformer. C) Inverter. D) Capacitor. Show Answer Correct Answer: A) Rectifier. 25. This theory was developed by Drude & Lorentz in 1900 A) Classical free electron theory. B) Quantum free electron theory. C) Bloch theory. D) Zone theory. Show Answer Correct Answer: A) Classical free electron theory. 26. An electron in conduction band A) Is located near the top of the crystal. B) Is bound to its parent atom. C) Has no charge. D) Has a higher energy than an electron in the valence band. Show Answer Correct Answer: D) Has a higher energy than an electron in the valence band. 27. What is the forbidden band gap in insulators compared to semiconductors? A) Larger in insulators. B) Not mentioned in the text. C) Larger in semiconductors. D) Same in both. Show Answer Correct Answer: A) Larger in insulators. 28. Highest energy level that can be occupied by an electron at 0 K A) Average energy. B) Fermi energy. C) Conduction state. D) Excited state. Show Answer Correct Answer: B) Fermi energy. 29. If F(E) =1, then A) 75% probability that the electrons to occupy energy level below Fermi level. B) 50% probability that the electrons to occupy energy level below Fermi level. C) 100% probability that the electrons to occupy energy level below Fermi level. D) 0% probability that the electrons to occupy energy level below Fermi level. Show Answer Correct Answer: C) 100% probability that the electrons to occupy energy level below Fermi level. 30. Convert alternating current (AC) to direct current (DC) A) Transistor. B) Diode. C) IC. D) None of the above. Show Answer Correct Answer: B) Diode. 31. Example for direct band gap semiconductors are A) Si. B) GaAs. C) AlSb. D) Ge. Show Answer Correct Answer: B) GaAs. 32. A semiconductor has generally ..... valence electrons. A) 2. B) 4. C) 6. D) 3. Show Answer Correct Answer: B) 4. 33. To start the stimulated emissions in direct bandgap semiconductors is required A) Large divergence. B) Coherence. C) Low current density. D) Large current density. Show Answer Correct Answer: D) Large current density. 34. Heat sinks can be used to dissipate heat produced by the forward conduction power losses. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 35. Electrons and holes are equal in magnitude but opposite in polarity A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 36. Intrinsic semiconductors are of A) 2 types. B) 1 type. C) 3 types. D) 4 types. Show Answer Correct Answer: A) 2 types. 37. At zero kelvin, how do semiconductors behave? A) As Superconductors. B) As Conductors. C) As Semiconductors. D) As Insulators. Show Answer Correct Answer: D) As Insulators. 38. What are the applications of photonics in communication? A) Quantum computing applications. B) Applications of photonics in communication include fiber optic communication, telecommunications, and data transmission in data centers. C) Medical imaging techniques. D) Solar energy conversion. Show Answer Correct Answer: B) Applications of photonics in communication include fiber optic communication, telecommunications, and data transmission in data centers. ← PreviousRelated 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 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 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