Physics General Knowledge MCQs

26. What is the process by which an atom or molecule absorbs energy and then emits it as light?
a) Reflection
b) Refraction
c) Diffraction
d) Emission

27. What is the formula for potential energy?
a) PE = 1/2mv²
b) PE = mgh
c) PE = Fd
d) PE = QV

28. What is the unit of magnetic field strength?
a) Tesla
b) Watt
c) Joule
d) Ohm

29. What is the formula for electric field strength?
a) E = F/Q
b) E = Q/V
c) E = P/t
d) E = 1/2mv²

30. What is the process by which a material can be magnetized?
a) Induction
b) Polarization
c) Magnetization
d) Conduction