Physics
stars which appear single to the naked eye but are double when seen through a telescope are

binaries
asteroids
quasars
novas and supernovas

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Physics
Which of the following is not a property of heavy water ?

It produces corrosion
Density of heavy water is higher than that of ordinary water
Boiling point of heavy water is lower than that or ordinary water
Freezing point of heavy water is higher than that of ordinary water

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