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

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Physics
X-rays region lies between

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

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