Physics
A vacuum cleaner works on the principle of pressure difference. On the moon it will

Work with reduced efficiency
Not work at all
Work with increased efficiency
Work as efficiently as on the earth

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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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