Answers

2015-04-17T14:23:44+05:30
You can make a solar system , a rotation and revolution model. 
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2015-04-17T15:03:04+05:30
E.V.S. means Environmental Science. I think you should make things related to our nature or the problems created by human beings for the nature. Or you can make a railway track. You can discuss and concern with your elders and friends. You should observe the things around you and I am sure you will get something. And remember please do it with interest because -
" NOTHING IS INTERESTING WHEN YOU ARE NOT INTERESTED "
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