Question

Once, Paheli visited a tailor shop and brought home some cuttings of fabric to study their properties. She took two pieces and found that one of the pieces were shrinking when it was burnt with a candle. However the  other did not shrink on burning. Can you help her to find out which of the two was a cotton fabric and which a silk fabric?

Answer 1

Cotton fabric does not shrink but silk fabric shrinks on burning due to the presence of protein.