CTET · Chapter Test
Materials (Classes VI–VIII) — 25-Question Test
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Key Concepts — Quick Reference
This chapter
Separation methods — match the method to the mixture
| Handpicking | small visible impurities from a small quantity (stones from rice) |
|---|---|
| Winnowing | lighter & heavier components using wind/air (husk from grain) |
| Sieving | components of different particle SIZE (flour from bran) |
| Filtration | insoluble solid from a liquid (mud from water) |
| Evaporation | recover a DISSOLVED solid from a liquid (salt from sea water) |
| Magnetic separation | magnetic from non-magnetic solids (iron filings from sulphur/sand) |
Acids, bases & the litmus test
| Acid + litmus | turns BLUE litmus RED · sour taste (lemon, vinegar, tamarind) |
|---|---|
| Base + litmus | turns RED litmus BLUE · bitter, soapy (soap, baking soda, lime water) |
| Neutral / salt | no change to litmus (common salt solution, pure water) |
| Neutralisation | acid + base → salt + water (heat released) |