Where the molecules possess more energy-in the bulk or in surface film?

Molecules of surface film have additional potential energy due to net inward intermolecular forces. Therefore, the molecules of surface film posess more energy than on the bulk.
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How does the ploughing of fields help in the preservation of moisture in the soil?

The formation of cappilaries take place in the field which are not ploughed for long. So, the moisture from inside of the soil reaches the surface and evaporates. But,  if the fields are ploughed, the capillaries will break and the water will not rise to surface and remains preserved in the soil.
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Mercury barometer reads less or more than actual? Explain.

Mercury barometer reads less than the actual reading because mercury is dry liquid. Therefore, as a result of surface tension the level of the fluid falls in the barometer. Hence, reads less. 
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Why oil spreads on cold water and may remain as a drop on hot water?


Surface tension of oil is less than cold water and hence oil spreads over cold water. But, surface tension of oil is greater than that of hot water and hence resumes the shape of drop. 
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A large bubble is formed at one end of capillary tube and a small one at the other end. Which one will grow at the expense of the other?

The excess of pressure inside the soap  bubble is  p equals fraction numerator 4 T over denominator R end fraction, Therefore, pressure inside the bigger bubble will be less than that inside the


The excess of pressure inside the soap  bubble is  , Therefore, pre

smaller bubble. Therefore, the air will flow from smaller bubble to bigger bubble. Hence the bigger bubble will grow at the expense of smaller bubble.
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