Physics
The force exerted by a magnet is an example of ________

Non-contact force
Contact force
Muscular force
Electrostatic force

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

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