Q1.
Fish out a red fish representing the method of separation first and then fish out one blue slip related to the red one. (Tank 1: Filtration, Decantation, Condensation, Handpicking, Churning, Evaporation, Winnowing, Sedimentation, Sieving, Threshing, Magnetic separation. Tank 2: difference in magnetic properties; difference in size of solid particles; heavier particles settle down; mixture of oil and water; extract butter from curd; separate salt from seawater; beating stalks to remove grains; conversion of water vapour into its liquid state; insoluble particles get filtered as residue; larger particles are handpicked; lighter component of mixture is separated by blowing air.)
Answer
Here is the complete pairing of Tank 1 with Tank 2.
| Tank 1 — red fish (method) | Tank 2 — blue slip |
|---|---|
| Filtration | insoluble particles get filtered as residue |
| Decantation | mixture of oil and water |
| Condensation | conversion of water vapour into its liquid state |
| Handpicking | larger particles are handpicked |
| Churning | extract butter from curd |
| Evaporation | separate salt from seawater |
| Winnowing | lighter component of mixture is separated by blowing air |
| Sedimentation | heavier particles settle down |
| Sieving | difference in size of solid particles |
| Threshing | beating stalks to remove grains |
| Magnetic separation | difference in magnetic properties |
How to be sure of a pair: for each method ask “which property does it use?” Sieving and handpicking both work on solids, but sieving uses size measured by the sieve while handpicking uses size big enough for fingers. Sedimentation and decantation are two halves of one job — settling first, pouring off second. Evaporation sends water away as vapour; condensation brings it back as liquid.
Tip for the game: make the rod from a stick, tie a thread and a small magnet at the end, and clip the paper fish with iron clips. Notice that the game itself works by magnetic separation!