Semiconductor Quiz PDF

**QUIZ: Introduction to Semiconductors** **Part 1: Multiple Choice (1 point each)** 1. Who proposed the planetary model of the atom?  2. What subatomic particle has no charge?  3. The maximum number of electrons in an atom's shell can be calculated using:  4. The outermost shell of an a...

**QUIZ: Introduction to Semiconductors** **Part 1: Multiple Choice (1 point each)** 1. Who proposed the planetary model of the atom?  2. What subatomic particle has no charge?  3. The maximum number of electrons in an atom's shell can be calculated using:  4. The outermost shell of an atom is called:  5. When an atom loses a valence electron, it becomes:  6. Which of the following is an example of a semiconductor?  7. The process of adding impurities to a semiconductor is called:  8. A **p-type** semiconductor is created by adding:  9. The conduction band is where: a) Electrons are tightly bound\ b) Valence electrons move freely\ c) Free electrons are found\ d) Protons reside 9. A material that does not conduct electricity is called: a) Conductor\ b) Semiconductor\ c) Insulator\ d) Superconductor 9. Which of the following is an **n-type** semiconductor impurity? a) Boron\ b) Gallium\ c) Indium\ d) Arsenic 9. The energy gap is the difference between: a) Valence band and conduction band\ b) Proton and electron levels\ c) Conductor and insulator properties\ d) Atomic and ionic charge 9. The purpose of a pentavalent impurity in a semiconductor is to: a) Create holes\ b) Increase free electrons\ c) Decrease conductivity\ d) Make it an insulator 9. The depletion region in a **pn-junction** is formed by: a) Ionization\ b) Heating the semiconductor\ c) Applying forward bias\ d) Removing the barrier voltage 9. What is the typical barrier voltage for silicon? a) 0.3V\ b) 0.5V\ c) 0.7V\ d) 1.1V 9. In **reverse bias**, the depletion region: a) Becomes smaller\ b) Becomes larger\ c) Disappears\ d) Moves towards the conduction band 9. A diode allows current to flow in: a) Both directions\ b) Only in reverse bias\ c) Only in forward bias\ d) Only in depletion mode 9. The breakdown voltage in reverse bias can lead to: a) Increased conductivity\ b) Overheating and damage\ c) Better performance\ d) More free electrons 9. The term **recombination** in semiconductors refers to: a) Electrons gaining energy\ b) Free electrons falling back into valence band\ c) Holes moving into conduction band\ d) Atom losing its nucleus 9. Which of the following elements is **not** used in semiconductor doping? a) Silicon\ b) Germanium\ c) Gold\ d) Boron **Part 2: True or False (1 point each)** 21. A semiconductor at absolute zero temperature behaves as a conductor. **(True / False)** 21. The Bohr model suggests that electrons orbit the nucleus in fixed energy levels. **(True / False)** 21. An **n-type** semiconductor has more holes than free electrons. **(True / False)** 21. Intrinsic semiconductors have a high level of impurities. **(True / False)** 21. The barrier voltage of a diode is higher in forward bias than in reverse bias. **(True / False)** **Part 3: Short Answer (2 points each)** 26. What is the primary difference between intrinsic and extrinsic semiconductors? 26. Define **doping** in semiconductors. 26. What is the function of the depletion region in a **pn-junction**? 26. Explain why silicon is commonly used in semiconductor devices. 26. What happens to a diode in **forward bias**? **Part 4: Problem Solving (3 points each)** 31. A silicon diode has a **barrier voltage** of 0.7V. If the bias voltage applied is 1.2V, what is the voltage across the diode? 31. A circuit has a **pn-junction** with a limiting resistor of **1 kΩ**. If a forward bias of **5V** is applied, calculate the current assuming the diode has a 0.7V drop. 31. Given a diode with **reverse bias voltage** of 50V and a **leakage current** of **2µA**, calculate the power dissipation. 31. An **n-type semiconductor** is created by adding a pentavalent impurity. Name two possible elements used for doping. 31. A hole current occurs when valence electrons move from one hole to another. How does this affect the overall charge movement in a semiconductor?