71. PARSEC is the unit of
72. The SI unit of 'Magnetic Flux' is:
73. Light year is a unit for measurement of
74. Loudness of sound is measured in ?
75. A light year is a measure of
76. The SI unit of electrical resistivity is . . . . . . . .
77. Weight has equal SI unit of-
78. 1 barrel of oil is equals to which of the following?
79. What is the SI unit of power of a lens called?
80. Which of the following has no unit-
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