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You can make a the following projects for your exhibition :- 
1. Gobar Gas plant 
2. Electrolysis :- Electroplating
3. Convection Current
4. Rain Water Harvesting project
5. Device working on Solar energy
6. Mirror Maze 
Many Details about the project on chart paper in good and neat handwriting should be shown
1 5 1
If you like the idea then mark it as brainlest
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