Q.

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

A. work as efficiently as on the earth
B. not work at all
C. work with reduced efficiency
D. work with increased efficiency
Answer» B. not work at all
Explanation: Vacuum cleaners work by creating a lower pressure just inside the opening which touches the floor. By creating a low pressure inside the machine, higher air pressure in the room pushes its way into the vacuum cleaner, taking the dirt with it.
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