How do we observe surface tension?

How do we observe surface tension?
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Small insects such can walk on water because their weight is notenough to penetrate the surface.A carefully placed small needle can be made to float on thesurface of water even though it is several times as dense as water.If the surface is agitated to break up the surface tension, needlewill quickly sink.
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Why the needle of iron swims on water surface when it is kept gently? (1) It will remain under the water, when it will displace more water than its weight (2) the density of needle is less than that of water (3) due to surface tension (4) due to its shape

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Water drops cannot stick to the oily surface due to – (1) lack of adhesive force (2) surface tension (3) cannot mix each other (4) water is lighter than oil

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A solid needle placed horizon-tally on the surface of the water floats due to – (1) capillary action (2) water pressure (3) surface tension of water (4) viscosity of water

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