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1. Intensity of sound at a point is __________ its distance from the source.
2. Sodium metal is kept under
3. Study of life in outer space is known as
4. Optical fibres are based on the phenomenon of
5. An aeroplane is flying horizontally with a velocity of 600 km/h and at a height of 1960 m. When it is vertically at a point A on the ground a bomb is released from it. The bomb strikes the ground at point B. The distance AB is
6. Light travels at the fastest speed in
7. Anemometer is an instrument used to
8. Which of the following is made up of muscular walls?
9. The hepatitis-B, which affects liver is actually a
10. Stars twinkle because



Arbaj Demrot is the founder of VideRime Online Learning, a leading engineering website. He did his BE Civil and M.Tech Structure from RGPV University, Bhopal and has been working as an Assistant Professor in a reputed college.

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