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| Q. |
What is the principle of a life Jacket'? |
| A. | It provides oxygen to a drowning person |
| B. | It increases the volume of the person to keep him afloat |
| C. | It decreases the volume of the person to keep him afloat |
| D. | The person can sit on it like a raft |
| Answer» B. It increases the volume of the person to keep him afloat | |
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Explanation: The upward-pushing force that keeps things afloat is called buoyancy. For an object to float it must be able to equal its own weight by displacing enough water. A life jacket is mainly filled with gas which has a very low mass. As such when worn by a person, it acts to significantly increase their volume for only a very small increase in their mass. |
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