_________ is a natural electrical phenomenon characterized by the appearance of streamers of reddish or greenish light in the sky, especially near the northern or southern magnetic pole.
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Which one of the following takes place during a nuclear fusion?
Calculate the frequency (in Hz) of a sound wave of wavelength 5 m travelling with a speed of 360 m/s.
Bubbles of air rise up through liquids due to
In the equation of motion 2as = v2 - u2, s represents _________________.
With reference to gravity, what is G called?
Optical fiber works on the principle of -
What is the unit of calorific value?
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