Question

i want idea about working model for class ix . it should be meaningful, useful and some innovative type.

Answer 1

You can try making a hand steadiness tester. Check the web.

Answer 2

I have an idea that I used in my science project...

1. We can make a model of a city,and the city should be powered by hydroelectricity. For that, we will need to make a hydroelectricity generator. Type on YouTube for the ideas....

hope it helped you:)