Physics
When number of turns in a coil is trippled, without any change in the length of coil, its self inductance becomes?

One–third
Three times
Six times
Nine times

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Physics
The sky appears blue because

The atmosphere scatters blue colour more than the others
All colours interfere to produce blue
It is actually blue
In white light, the blue component dominates

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Physics
Inside an aeroplane, flying at a high altitude,

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

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