Q2 of 16 Page 26

Float a knitting needle on the surface of water.

Usually metal needles sink into water because they have higher density than that of water. However, when it is put horizontally, the weight of the volume of liquid displaced by the immersed part is more than the weight of the needle, so it can float since the buoyant force is greater than its weight in this orientation.


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7

Which is the correct figure? Why?

 1

Prepare a table of substances of density less than that of water.

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Using a spring balance, water and overflow jar find out the densities of substances of different shapes and sizes and tabulate.

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Using a hydrometer find out adulterated liquids.