Physics
A gap is left between two rails of a railway track to accommodate...... of the metal.

Volume expansion
Linear expansion
Apparent expansion
Areal expansion

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Physics
Which of the following occurred first ?

Wright Brothers successfully flew an aircraft
Guglielmo Marconi sent out the first wireless signals
Albert Einstein propounded the General Theory of Relativity
Max Planck unveiled the Quantum Theory

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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.
It follows the wave path near the tropopause at elevations of 8 km to 15 km.
In summer, the polar front jet achieves its maximum force.

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