Physics
The mercury and sodium street lamps light up because of :

Electron emission
Electron absorption
Atomic absorption
Atomic emission

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Physics
Which of the following is not a property of heavy 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
Density of heavy water is higher than that of ordinary water
It produces corrosion

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Physics
Inside an aeroplane, flying at a high altitude,

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

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