21. Which of the following is a device used to measure the strength and direction of a magnetic field?
a) Galvanometer
b) Ammeter
c) Voltmeter
d) Magnetometer
22. Which of the following is not a type of magnetism?
a) Ferromagnetism
b) Paramagnetism
c) Diamagnetism
d) Thermomagnetism
23. The process of making a non-magnetic material magnetic by placing it in a strong magnetic field is called:
a) Magnetization
b) Demagnetization
c) Polarization
d) Depolarization
24. The property of a material to lose its magnetism after the removal of an external magnetic field is called:
a) Magnetization
b) Demagnetization
c) Polarization
d) Depolarization
25. The property of a material to retain some amount of magnetism even after the removal of an external magnetic field is called:
a) Magnetization
b) Demagnetization
c) Polarization
d) Remanence
