Answers

2016-01-09T20:32:55+05:30
You can make a mechanical sieve by attaching a perforated paper (Make hole on a sheet of paper with the help of pins) to a square mould. Glue four wooden sticks together for a square, or use any other, if you have. Attach a small battery (available at any electrical store). You can show its working by using sand and bits of paper. The sand will be seperated from the paper.
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