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

the sand is grainy but concrete is smooth.
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.

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Physics
A Fuse wire is characterised by

Low resistance and low melting point
High resistance and low melting point
Low resistance and high melting point
High resistance and high melting point

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