Physics
The instrument used to see the distant objects on the Earth is

Astronomical telescope
Simple microscope
Terrestrial telescope
Compound microscope

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Physics
Inside an aeroplane, flying at a high altitude,

normal humidity and partial vacuum are maintained.
normal atmospheric pressure is maintained by the use of air pumps.
the pressure is the same as that outside.
the pressure inside is less than the pressure outside.

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

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

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