Q1: 1. Which of the following materials does not exhibit magnetic properties?

• A) Copper
• B) Iron
• C) Nickel
• D) Cobalt

Q2: 2. What is the SI unit of magnetic field strength?

• A) Tesla
• B) Joule
• C) Newton
• D) Watt

Q3: 3. Which of the following statements is true about a magnetic field line?

• A) They are parallel to each other.
• B) They do not form closed loops.
• C) They point from south to north pole outside the magnet.
• D) They point from north to south pole inside the magnet.

Q4: 4. What is the property of a material to retain its magnetization in the absence of an external magnetic field called?

• A) Susceptibility
• B) Permeability
• C) Hysteresis
• D) Retentivity

Q5: 5. Which of the following is an example of a soft magnetic material?

• A) Steel
• B) Alnico
• C) Permalloy
• D) Tungsten

Q6: 6. What is the phenomenon where a material becomes magnetized in the presence of an external magnetic field called?

• A) Diamagnetism
• B) Paramagnetism
• C) Ferromagnetism
• D) Electromagnetism

Q7: 7. Which of the following is an example of a permanent magnet?

• A) Electromagnet
• B) Bar magnet
• C) Solenoid
• D) Iron nail

Q8: 8. What is the effect of temperature on the magnetic properties of a ferromagnetic material?

• A) Increases magnetization
• B) Decreases magnetization
• C) No effect on magnetization
• D) Reverses magnetization

Q9: 9. Which law explains the force between two magnetic poles?

• A) Gauss's law
• B) Biot-Savart law
• C) Ampere's law
• D) Coulomb's law

Q10: 10. In a magnetic material, what is the relationship between magnetization and magnetic field strength?

• A) Proportional
• B) Inversely proportional
• C) Unrelated
• D) Constant

Q11: 11. Which of the following is not a method to demagnetize a magnet?

• A) Heating
• B) Hammering
• C) Passing electric current
• D) Storing near other magnets

Q12: 12. What happens to the magnetic field strength as you move away from a magnet?

• A) Increases
• B) Decreases
• C) Remains constant
• D) Reverses direction

Q13: 13. Which of the following materials is used in magnetic shielding applications?

• A) Aluminum
• B) Lead
• C) Copper
• D) Mu-metal

Q14: 14. What is the property of a material that determines how easily it can be magnetized called?

• A) Retentivity
• B) Permeability
• C) Susceptibility
• D) Hysteresis

Q15: 15. Which of the following is an example of a temporary magnet?

• A) Neodymium magnet
• B) Alnico magnet
• C) Soft iron
• D) Ferrite magnet

Q16: 16. What is the direction of the force experienced by a moving charged particle in a magnetic field?

• A) Along the direction of motion
• B) Opposite to the direction of motion
• C) Perpendicular to the direction of motion
• D) Radial to the direction of motion

Q17: 17. Which law describes the magnetic field produced by a current-carrying conductor?

• A) Lenz's law
• B) Faraday's law
• C) Ampere's law
• D) Ohm's law

Q18: 18. What is the effect of increasing the number of turns in a coil on its magnetic field strength?

• A) Decreases
• B) Increases
• C) Remains constant
• D) Reverses direction

Q19: 19. Which of the following is an example of a ferromagnetic material?

• A) Aluminum
• B) Silicon
• C) Cobalt
• D) Brass

Q20: 20. What is the phenomenon where a changing magnetic field induces an electromotive force in a conductor called?

• A) Inductance
• B) Capacitance
• C) Resistance
• D) Electromagnetic induction

Q21: 21. Which of the following materials has the highest magnetic permeability?

• A) Air
• B) Steel
• C) Aluminum
• D) Wood

Q22: 22. What is the direction of the magnetic field lines around a straight current-carrying conductor?

• A) Radial outward
• B) Radial inward
• C) Circular clockwise
• D) Circular counterclockwise

Q23: 23. Which of the following is a characteristic of a paramagnetic material?

• A) Strongly attracted to magnets
• B) Weakly attracted to magnets
• C) Repelled by magnets
• D) Not influenced by magnets

Q24: 24. What happens to the magnetic field inside a diamagnetic material when placed in an external magnetic field?

• A) Strengthens
• B) Weakens
• C) Reverses direction
• D) Remains unaffected

Q25: 25. Which law describes the relationship between the magnetic field and the electric current flowing through a conductor?

• A) Biot-Savart law
• B) Ohm's law
• C) Lenz's law
• D) Faraday's law