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1) A steel needle placed carefully on the surface of water does not sink,​

User Miltonb
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Step-by-step explanation:

When a needle is placed carefully on the surface of water, it floats on the surface of water due to the surface tension of water, which does not allow the needle to sink. In case of a steel ball, the surface tension of the water is not sufficient to keep it floating, so it sinks down.

User Arti Singh
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