81. The unit of energy in MKS system is
82. One light year is equal to
83. Parsec is the unit of
84. One nanometer is equal to ________ meters.
85. The Length of the Day is determined in
86. Which of the following pairs of physical quantities have the same dimensions?
87. What is the fundamental unit of amount of a substance?
88. The motion of a body that repeats itself after a regular interval of time is
89. Negative acceleration is in the opposite direction of:
90. If an object moves with constant velocity,
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