Methods of Separation in Everyday Life Part 2: MCQs (Q26–Q50)

Part 2 — Questions 26 to 50 (Advanced separation methods and applications)

26. Which method is used to separate chalk powder from water?

A. Evaporation
B. Filtration ← Correct Answer
C. Winnowing
D. Sieving
Explanation:
A) Wrong — evaporation removes dissolved solids, not suspended chalk.
B) Correct — filter paper separates insoluble chalk particles.
C/D) Not applicable.

27. Which separation method is used in separating salt from sand?

A. Filtration after dissolving in water, then evaporation ← Correct Answer
B. Winnowing
C. Sieving
D. Decantation
Explanation:
A) Correct — dissolve salt, filter sand, evaporate water to get salt.
B/C/D) Not effective.

28. The instrument used to separate immiscible liquids is

A. Centrifuge
B. Magnet
C. Separating funnel ← Correct Answer
D. Sieve
Explanation:
C) Correct — separating funnel separates oil and water.

29. Distillation is used to separate

A. Salt and sand
B. Husk and grain
C. Mixture of miscible liquids like alcohol and water ← Correct Answer
D. Oil and water
Explanation:
C) Correct — distillation separates liquids with different boiling points.

30. Which of these is not an example of separation?

A. Handpicking stones from rice
B. Winnowing grain from husk
C. Filtration of water
D. Mixing sugar in tea ← Correct Answer
Explanation:
D) Correct — mixing is not separation, it’s forming a solution.

31. Which method is used to separate cream from milk?

A. Evaporation
B. Sieving
C. Centrifugation ← Correct Answer
D. Sedimentation
Explanation:
C) Correct — centrifugation separates lighter cream from heavier milk.

32. The process of separating components of air is

A. Filtration
B. Evaporation
C. Fractional distillation ← Correct Answer
D. Sieving
Explanation:
C) Correct — air gases separated by cooling and fractional distillation.

33. Mixture of sand and water can be separated by

A. Sedimentation and decantation ← Correct Answer
B. Evaporation
C. Winnowing
D. Magnetic separation
Explanation:
A) Correct — sand settles, water decanted off.

34. Which method is used to separate sugar dissolved in water?

A. Sieving
B. Winnowing
C. Evaporation ← Correct Answer
D. Filtration
Explanation:
C) Correct — evaporation removes water, sugar remains.

35. Which process is used in petroleum refineries?

A. Fractional distillation ← Correct Answer
B. Sieving
C. Decantation
D. Filtration
Explanation:
A) Correct — crude oil is separated by fractional distillation.

36. Which separation method uses differences in particle size?

A. Filtration
B. Sieving ← Correct Answer
C. Distillation
D. Evaporation
Explanation:
B) Correct — sieving separates based on particle size.

37. Which is NOT separated by magnetic separation?

A. Iron from sand
B. Steel pins from waste
C. Salt from water ← Correct Answer
D. Iron nails from sawdust
Explanation:
C) Correct — salt is non-magnetic.

38. The process of separating lighter husk particles using wind is

A. Filtration
B. Sieving
C. Winnowing ← Correct Answer
D. Decantation
Explanation:
C) Correct — husk is blown away, grains fall down.

39. What is left behind after evaporation of salt solution?

A. Water vapor
B. Sand
C. Salt crystals ← Correct Answer
D. Oil
Explanation:
C) Correct — dissolved salt reappears after water evaporates.

40. Which method is used to separate small stones from wheat?

A. Sieving
B. Evaporation
C. Handpicking ← Correct Answer
D. Winnowing
Explanation:
C) Correct — visible impurities removed by hand.

41. Which process is used to separate butter from buttermilk?

A. Sieving
B. Churning ← Correct Answer
C. Sedimentation
D. Evaporation
Explanation:
B) Correct — churning separates fat (butter).

42. Which method is best for purifying muddy water?

A. Sieving
B. Winnowing
C. Sedimentation followed by filtration ← Correct Answer
D. Evaporation
Explanation:
C) Correct — mud settles, clear water filtered.

43. When a sieve is used, the substance that remains on sieve is called

A. Filtrate
B. Residue
C. Retained particles ← Correct Answer
D. Solution
Explanation:
C) Correct — larger particles remain on sieve.

44. Separation of camphor from salt can be done by

A. Filtration
B. Sublimation ← Correct Answer
C. Sieving
D. Sedimentation
Explanation:
B) Correct — camphor sublimes directly to gas.

45. Which separation method is used in tea factories to separate tea leaves of different sizes?

A. Winnowing
B. Sieving ← Correct Answer
C. Filtration
D. Sedimentation
Explanation:
B) Correct — sieves classify leaves by size.

46. Which of the following cannot be separated by handpicking?

A. Stones from rice
B. Glass pieces from pulses
C. Salt from water ← Correct Answer
D. Pins from grains
Explanation:
C) Correct — dissolved salt requires evaporation.

47. The process of separating water from wet clothes in washing machine is

A. Evaporation
B. Sedimentation
C. Centrifugation (spinning) ← Correct Answer
D. Decantation
Explanation:
C) Correct — spin-dry removes water by centrifugal force.

48. The instrument used in laboratories to separate solids from liquids by spinning fast is

A. Funnel
B. Magnet
C. Centrifuge ← Correct Answer
D. Sieve
Explanation:
C) Correct — centrifuge separates particles by density.

49. When muddy water is filtered, what remains on filter paper?

A. Filtrate
B. Residue (mud) ← Correct Answer
C. Solution
D. Supernatant
Explanation:
B) Correct — mud particles remain on filter.

50. Which method separates dyes in ink?

A. Sedimentation
B. Chromatography ← Correct Answer
C. Filtration
D. Winnowing
Explanation:
B) Correct — chromatography separates mixtures of colors.

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