16. Which of the following is an example of a scalar quantity?
a) Velocity
b) Acceleration
c) Force
d) Temperature
Answer: d) Temperature
17. What is the SI unit of frequency?
a) Hertz
b) Watt
c) Joule
d) Ohm
Answer: a) H
18. What is the formula for power?
a) P = Fd
b) P = QV
c) P = W/t
d) P = 1/2mv²
Answer: c) P = W/t
19. What is the formula for density?
a) ρ = m/V
b) ρ = V/m
c) ρ = F/A
d) ρ = P/V
Answer: a) ρ = m/V
20. What is the process by which a gas turns into a liquid called?
a) Sublimation
b) Evaporation
c) Boiling
d) Condensation
Answer: d) Condensation
