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Q. Why does a cannon recoil after firing ?
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Q. Convex mirror is generally used in ________
Q. In house wiring which type of insulation is used ?
Q. When there are no external forces the shape of a liquid drop is determined by
Q. Which ecological pyramid can never be inverted
Q. Who invented the phonograph?
Q. When an aeroplane is flying at a great height, the sky appears black to its passengers. Why ?
Q. A radioactive substance has a half-life of 4 months. Three fourth of the substance would decay in
Q. Which one of the following has the highest value of specific heat ?
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