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