Physics
Kepler's law of planetary motion states that the square of the time period is proportional to the

Cube of the semi-major axis
Semi-major axis
Fourth power of the semi-major axis
Square of the semi-major axis

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Physics
Super conductors are substances that

Conduct electricity at low temperature
Offer high resistance to the flow of electric current
Conduct electricity at high temperature
Offer minimum resistance to flow of electric current

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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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