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