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| 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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