Physics
The refractive index of a transparent medium is maximum for

Red light
Yellow light
Green light
Violet light

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Physics
The sky appears blue because

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

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Physics
Which one of the following statements with regard to Jet stream, an upper level tropospheric wave, is not correct?

It is narrow band of high-velocity wind.
In summer, the polar front jet achieves its maximum force.
Jet streams are typically continuous over long distances.
It follows the wave path near the tropopause at elevations of 8 km to 15 km.

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