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

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

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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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Physics
A Fuse wire is characterised by

High resistance and low melting point
Low resistance and high melting point
High resistance and high melting point
Low resistance and low melting point

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