Physics
When a steel ball is placed on the surface of mercury, it does not sink because

The density of mercury is greater than that of steel
Of the surface tension of mercury
Of the high viscosity of mercury
Mercury is a semisolid

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Physics
X-rays region lies between

Gamma-rays and ultraviolet region
Short radio waves and long radio waves
Visible and infra-red region
Ultraviolet and visible region

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