McqMate
| Q. |
Why the needle of iron swims on water surface when it is kept gently? |
| A. | It will remain under the water, when it will displace more water than its weight |
| B. | the density of needle is less than that of water |
| C. | due to surface tension |
| D. | due to its shape |
| Answer» C. due to surface tension | |
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Explanation: According to Archimedes principle and we can note that the amount of water displaced by a needle is lesser than the amount of water moved out by the needle (that is displacement of the needle). So the needle initially stays on the surface of the water and then sinks into the water. Surface tension is a contractive tendency of the surface of a liquid that allows it to resist an external force. |
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