Physics
X–rays are

Positively charged particles
Neutral particles
Negatively charged particles
None of these

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Physics
Of the four locations mentioned below the highest inside temperature will be attained in the pressure cooker operated with the pressure valve open

at the top of Mt. Everest
in an aeroplane flying at a height of 10,000 m with inside pressure maintained at the sea level
at a place in a valley below sea level
at sea level

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Physics
Superconductors are those elements

Which turn into insulators at very low temperatures
Whose conductivity is intermediate between metals and insulators
Whose resistance falls almost to zero at very low temperatures
Which conduct electricity only at super-high temperatures

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