Give scientific reason of the following 1. rain water is more fertile than water from tube well 2. the man-hole covers are generally round 3. clothes of a moving dancer bulge 4. peoples are advised not to stand near a fast moving train 5. the image of a tree looks inverted on the bank of a lake

Give scientific reason of the following
1. rain water is more fertile than water from tube well
2. the man-hole covers are generally round
3. clothes of a moving dancer bulge
4. peoples are advised not to stand near a fast moving train
5. the image of a tree looks inverted on the bank of a lake
by

1 Answer

Answer :

1. rain water is more fertile than water from tube well
after falling, the rain drops start moving on slope side, during this movements, the soluble salts and minerals solves from top soil in the flowing water, which increases its fertility, while the rain drops which percolates into deeper regions of soil are note able to absorb more salts and minerals so is less fertile as compared to rain water in streams

2. the man-hole covers are generally round
Manhole covers are round so that is doesn’t get dropped accidentally into the manhole. The round shape requires less space than a square and makes handling easier. Once removed, the cover can be transported by rolling.

3. clothes of a moving dancer bulge
due to movement of dancer the clothes got electric charge, which on fast movement collides with the opposite charge so the clothe bulge inside out

4. peoples are advised not to stand near a fast moving train
people are advised not to stand near a fast moving train as the train in tremendous speed cuts the pressure of air which can disbalance the objects after passing of train present near the railway line

5. the image of a tree looks inverted on the bank of a lake
This is due to the law of reflection according to which image is formed far and inverted
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