Physics
Which of the following is not caused by atmospheric refraction of light ?

Sun becoming visible two or three minutes before actual sunrise
Sun appearing red at sunset
Sun appearing higher in the sky than it actually is
Twinkling of stars at night

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

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

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