Universal time is based on:

  • A
    Rotation of the earth on its axis
  • B
    Earth's orbital motion around the sun
  • C
    Vibrations of cesium atom
  • D
    Oscillations of quartz crystal

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Define density and give the $MKS$ and $CGS$ units of density.

$1 \text{ MW} = \dots \text{ erg/s}$.

Which of the following is not a unit of energy?

Which of the following is not a unit of energy?

$1 \text{ kilowatt hour} = \dots \text{ joules}$

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