Why the needle of iron swims on water surface when it is kept gently ?
Correct answer: C. due to surface tension
- 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
Explanation
A gently placed iron needle can be supported by the water surface because surface tension acts like a stretched film around it. This does not mean iron is less dense than water; the needle would otherwise sink.
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