UPSC Exam > UPSC Notes > NCERT Summary: UPSC > Short Questions: Separation of Substances
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Q1: Define winnowing.
Ans: Winnowing is the process of separating heavy components from lighter components with the help of wind.
Q2: Define threshing.
Ans: The term "threshing" refers to the process of removing grains from their stalks. The stalks are beaten to liberate the grain seeds in this process.
Q3: Define decantation.
Ans: Decantation is the process of taking out clear water into a new container after sedimentation. The water after decantation is clear but it is still not fit for drinking.
Q4: Define condensation.
Ans: Condensation is the process of turning water vapour into liquid.
Q5: Name 5 methods used for separating substances from their mixtures?
Ans: Five methods used for separating substances are:
- Winnowing
- Sieving
- Handpicking
- Threshing
- Decantation
Q6: What is sieving?
Ans: Sieving is the process of separating tiny particles from larger particles by the use of holes in a sieve.
Q7: Define sedimentation.
Ans: Sedimentation is the process in which heavier components settle down at the bottom of the container. E.g. Water mixed with mud or sand.
Q8: Define evaporation.
Ans: Evaporation is the process of converting water into water vapour.
Q9: Define saturated solution.
Ans: Saturated solution is a solution in which no more of a substance/solute can be dissolved.
Q10: Give one importance of separating substances from the mixtures.
Ans: It is important to separate substances from mixtures to obtain pure substances differently for various purposes.
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Oct 06, 2025
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