Physics
It is more difficult to walk on a sandy road than on a concrete road because

the friction between sand and feet is more than that between concrete and feet.
sand is soft and concreter is hard.
the sand is grainy but concrete is smooth.
the friction between sand and feet is less than that between concrete and feet.

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Physics
Superconductors are those elements

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

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Physics
X-rays region lies between

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

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