66. What is the formula for electric power?
a) P = IV
b) P = Q/t
c) P = Fd/t
d) P = 1/2mv²/t
Answer: a) P = IV
67. What is the formula for the period of a wave?
a) T = fλ
b) T = 1/f
c) T = v/f
d) T = 2π/λ
Answer: b) T = 1/f
68. What is the process by which a liquid turns into a gas?
a) Vaporization
b) Sublimation
c) Melting
d) Condensation
Answer: a) Vaporization
69. What is the SI unit of frequency?
a) Hertz
b) Watt
c) Pascal
d) Joule
Answer: a) Hertz
70. What is the process by which a gas turns directly into a solid?
a) Vaporization
b) Sublimation
c) Melting
d) Condensation
Answer: b) Sublimation
