71. What is the formula for work?
a) W = Fd
b) W = QV
c) W = mgh
d) W = 1/2mv²
Answer: a) W = Fd
72. Which type of electromagnetic radiation has the longest wavelength?
a) Infrared radiation
b) X-rays
c) Gamma rays
d) Ultraviolet radiation
Answer: a) Infrared radiation
73. What is the formula for the speed of light?
a) c = λf
b) c = 1/λf
c) c = λ/T
d) c = f/T
Answer: a) c = λf
74. Which law states that the total energy of a closed system remains constant?
a) Newton’s First Law
b) Newton’s Second Law
c) Newton’s Third Law
d) Law of Conservation of Energy
Answer: d) Law of Conservation of Energy
75. What is the process by which a solid turns into a liquid?
a) Vaporization
b) Sublimation
c) Melting
d) Condensation
Answer: c) Melting
