71. Light year is a measurement of
72. Very small time intervals are accurately measured by
73. One kilometer is equal to how many miles?
74. Kilohertz is a unit which measures
75. One horse power is equal to
76. 'Bar' is the unit of
77. One Joule is equal to
78. Kilowatt is a unit to measure:
79. Electric current is measured by:
80. A chronometer measures:
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