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why some detergents include live microbes?

Microbes act on the stains and other blots biologically...for example there might be a microbe that acts of the petrol that is lost to the oceans.

if i drop from the tower of pisa a kilo of wool and also a kilo of iron. which will hit the land first? first think then reply?

Both will hit the ground at exactly the same moment. (Acceleration of the earth is uniform and we can ignore the air resistance)

what should be increased to make float a drowning body? (its length, width or height) and why?

it's density. that is mass per unit volume.

why jet fighters fly in v shaped form?

during world war 2, this was a formation adopted by the allies which denoted V for victory.

manual qulfi makers add salt to ice? why do they do this?

so that ice melts slowly and at higher temperatures. impurities increase the freezing point of any substance.

why can we not cut the diamonds?(normaly)

diamonds can be cut but they are one of the hardest substances on the planet. It is because of the strong covalent bonds between the carbon atoms that constitute a diamond.

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Umar Abbas Babar
I Know I am Bad But When Bad is the Best, Bad is the Only Choice