Electronic and Magnetic Materials
- 1. What is the basic unit of an electromagnetic field?
A) Photon
B) Electron
C) Neutron
D) Proton
- 2. Which material is known for its high electrical conductivity?
A) Plastic
B) Rubber
C) Glass
D) Copper
- 3. What material is widely used in computer hard drives for data storage?
A) Carbon
B) Ferrite
C) Titanium
D) Aluminum
- 4. Which of the following materials is a semiconductor?
A) Copper
B) Silicon
C) Silver
D) Gold
- 5. Which material is commonly used as a permanent magnet?
A) Copper
B) Neodymium
C) Plastic
D) Aluminum
- 6. What is the phenomenon where a material retains some magnetization when an external magnetic field is removed?
A) Diffusion
B) Resonance
C) Polarization
D) Hysteresis
- 7. What type of material does not allow electric current to flow freely?
A) Dielectric
B) Insulator
C) Conductor
D) Semiconductor
- 8. Which material is used as a core in transformers due to its high magnetic permeability?
A) Aluminum
B) Copper
C) Iron
D) Plastic
- 9. What type of material becomes magnetized in the presence of an external magnetic field and retains some magnetization when the field is removed?
A) Ferromagnetic
B) Superconductive
C) Diamagnetic
D) Non-magnetic
- 10. What property of a material determines its ability to store energy in an electromagnetic field?
A) Resistivity
B) Susceptibility
C) Permittivity
D) Conductivity
- 11. What is the process of creating an electric current in a closed circuit by changing the magnetic field around the circuit?
A) Piezoelectric effect
B) Photoelectric effect
C) Thermionic emission
D) Electromagnetic induction
- 12. What is the property of a material that allows it to respond to an applied magnetic field by becoming magnetized?
A) Thermal conductivity
B) Electrical resistance
C) Magnetic susceptibility
D) Young's modulus
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