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Facts and Reasons - Page 1

1. Why is it dangerous to sleep under trees at night ?

Fact / Reason:
Plants respire at night and give out carbon dioxide which reduces the oxygen content of air required for breathing.

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2. Why does water remain cold in an earthen pot ?

Fact / Reason:
There are pores in an earthen pot which allow water to percolate to the outer surface. Here evaporation of water takes place thereby producing a cooling effect.

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3. Why does a small iron sink in water but a large ship float ?

Fact / Reason:
The weight of water displaced by an iron ball is less than its own weight, whereas water displaced by the immersed portion of a ship is equal to its weight (Archimedes Principle).

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4. Why is the sky blue?

Fact / Reason:
Violet and blue light have short waves which are scattered more than red light waves. While red light goes almost straight through the atmosphere, blue and violet light are scattered by particles in the atmosphere. Thus, we see a blue sky.

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5. Why is a rainbow seen after a shower?

Fact / Reason:
After a shower, the clouds containing water droplets act like a prism through which the white light is dispersed producing a spectrum.

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