Physics General Knowledge MCQs

21. What is the SI unit of wavelength?
a) Meter
b) Hertz
c) Joule
d) Newton

22. What is the formula for torque?
a) T = Fd
b) T = Fr sin θ
c) T = mgh
d) T = QV

23. Which of the following is an example of a non-renewable energy source?
a) Solar energy
b) Wind energy
c) Coal
d) Hydroelectric energy

24. What is the process by which an atom loses or gains electrons called?
a) Ionization
b) Radiation
c) Conduction
d) Induction

25. What is the formula for electric power?
a) P = IV
b) P = I²R
c) P = V²/R
d) P = QV