Doubts regarding Enginnering subjects(che/mech/eee/it/civil)???

Questions regarding your career????

Doubts regarding your subjects...????

Ask any personal question and a perfect answer from me.......

Can anyone answer these stupid questions???

1.What is nuclear winter???
2.Why are rain clouds black??
3.what is meant by cloud burst??
4.why is distilled water not used for drinking??
5.hoe do fruita aquire sweetness??
6.how does an electric train work???

For so many such scientific questions.......