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