What is sound?
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What is refraction of light?
Two parallel beams of electrons are moving in the same direction. Does they repel or attract each other?
If blue light is combined with green light, what color of light is produced?
What is meant by common potential?
What is black body ?
Why do stars twinkle? Why do planets not twinkle?
Order the following categories of electromagnetic radiation from the lowest frequency to the highest? Fm radio, uhf tv, am radio, microwaves
How does birds specially adopted to flight ?
What is the Ordinary magnet ?
the magnifying power of a simple microscope can be increased if we use eye piece of
Why does heated air expand?
The gas that used in bulb is............? a) Oxygen b)nitrogen c)hydrogen d)co2
General Physics 
