In which year did Ole Romer measure the speed of light for the first time in the history?
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The planet Mars is also known as the ____.
Calculate the time period (in seconds) of a sound wave of wavelength 5m travelling with a speed of 500 m/s.
Who has been appointed as the Chief Secretary of the Delhi Government in December 2017?
The unit of power used in industry is
What of the following refers to hypotheses which are confirmed by varied tests?
ZIKA virus which causes neurological birth disorders is transmitted by
What is the valency of magnesium?