- 1. Semiconductors are materials with electrical conductivity between that of a conductor and an insulator. They have revolutionized technology by enabling the development of electronic devices such as transistors, diodes, and integrated circuits. These components are the backbone of modern electronics and are used in a wide range of applications, including computers, smartphones, and medical devices. Semiconductors work by controlling the flow of electric current, allowing for the precise manipulation of signals and data. Their unique properties have made them essential in advancing communication, computing, and various other fields of science and technology.
Which of the following is a common semiconductor material?
A) Aluminum
B) Steel
C) Silicon
D) Copper
- 2. Semiconductors are often used in the production of:
A) Plumbing materials
B) Clothing
C) Automobile parts
D) Electronic devices
- 3. How does a photovoltaic cell work?
A) Emits light
B) Converts light into electricity
C) Reflects light
D) Stores energy as light
- 4. Which device allows current to flow in one direction only?
A) Resistor
B) Transistor
C) Capacitor
D) Diode
- 5. What is the purpose of a voltage regulator in an electronic circuit?
A) Maintain a constant voltage level
B) Transform energy
C) Store energy
D) Amplify signals
- 6. What role does a semiconductor switch play in electronic circuits?
A) It generates light from electricity.
B) It measures resistance levels.
C) It amplifies electrical signals.
D) It controls the flow of current in a circuit.
- 7. Which semiconductor device functions as an amplifier or an electronic switch?
A) Diode
B) Transistor
C) Resistor
D) Inductor
- 8. What is the purpose of a semiconductor laser?
A) Generate heat
B) Store data
C) Convert sound to electricity
D) Produce coherent light
- 9. In which direction does current flow in an n-type semiconductor?
A) From electron holes to electrons
B) From positive to negative
C) From valence band to conduction band
D) From negative to positive
- 10. What is the process of forming a thin layer of oxide on a semiconductor surface?
A) Oxidation
B) Deposition
C) Etching
D) Plating
- 11. What is the band gap in a semiconductor?
A) Temperature at which it operates
B) Energy stored in the material
C) Energy difference between the valence and conduction bands
D) Resistance to electricity flow
- 12. Which semiconductor component stores charge temporarily?
A) Diode
B) Transistor
C) Capacitor
D) Resistor
- 13. What property of semiconductors can be modified by applying an external electric field?
A) Color
B) Conductivity
C) Thermal conductivity
D) Melting point
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