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