Methods of Separation in Everyday Life Part 3: MCQs (Q51–Q75)
Part 3 — Questions 51 to 75 (Special techniques & daily life applications)
51. Which separation method is used for separating immiscible liquids like kerosene and water?
A. Filtration
B. Sedimentation
C. Separating funnel ← Correct Answer
D. Sieving
Explanation:
C) Correct — separating funnel separates liquids with different densities.
52. Which of these is an irreversible process?
A. Evaporation
B. Burning sugar ← Correct Answer
C. Condensation
D. Freezing
Explanation:
B) Correct — new substance formed, can’t be reversed.
53. Which method separates husk from wheat grains?
A. Winnowing ← Correct Answer
B. Filtration
C. Sieving
D. Decantation
Explanation:
A) Correct — wind blows away lighter husk.
54. Salt and camphor mixture can be separated by
A. Evaporation
B. Sieving
C. Sublimation ← Correct Answer
D. Decantation
Explanation:
C) Correct — camphor sublimes directly into vapor.
55. The method used in purification of water in water treatment plants is
A. Sublimation
B. Sedimentation, filtration and chlorination ← Correct Answer
C. Sieving only
D. Evaporation
Explanation:
B) Correct — all three steps purify water.
56. Which method separates sand from sugar?
A. Winnowing
B. Dissolving in water, filtration, and evaporation ← Correct Answer
C. Magnetic separation
D. Sublimation
Explanation:
B) Correct — sugar dissolves, sand filtered, sugar recovered by evaporation.
57. What is chromatography used for?
A. Removing stones from rice
B. Separating different colors/dyes ← Correct Answer
C. Separating oil and water
D. Evaporation of salt
Explanation:
B) Correct — paper chromatography separates components of a mixture.
58. What is the principle of winnowing?
A. Size of particles
B. Difference in weight (density) ← Correct Answer
C. Solubility
D. Magnetic property
Explanation:
B) Correct — heavier grains fall, lighter husk flies away.
59. In filtration, the liquid that passes through the filter is called
A. Residue
B. Filtrate ← Correct Answer
C. Sediment
D. Slurry
Explanation:
B) Correct — filtrate is the clear liquid that passes through filter paper.
60. Which separation method is used in the production of alcohol?
A. Evaporation
B. Distillation ← Correct Answer
C. Sieving
D. Winnowing
Explanation:
B) Correct — alcohol separated from water by distillation.
61. Which method removes iron pins from sawdust?
A. Sieving
B. Filtration
C. Magnetic separation ← Correct Answer
D. Sedimentation
Explanation:
C) Correct — magnet attracts iron pins.
62. Which method separates sugar from its solution?
A. Filtration
B. Evaporation ← Correct Answer
C. Sieving
D. Magnetic separation
Explanation:
B) Correct — water evaporates, sugar remains.
63. Which is NOT a separation technique?
A. Distillation
B. Combustion ← Correct Answer
C. Chromatography
D. Sieving
Explanation:
B) Correct — combustion is a chemical reaction, not separation.
64. The method used to separate cream from milk at large scale is
A. Filtration
B. Sieving
C. Centrifugation ← Correct Answer
D. Decantation
Explanation:
C) Correct — centrifuges spin milk to separate cream.
65. Which process is used to obtain common salt from seawater?
A. Sedimentation
B. Evaporation ← Correct Answer
C. Sieving
D. Winnowing
Explanation:
B) Correct — seawater evaporates, salt remains.
66. Which separation method depends on solubility of solids?
A. Winnowing
B. Filtration and evaporation ← Correct Answer
C. Sieving
D. Magnetic separation
Explanation:
B) Correct — dissolve soluble substance, filter insoluble, evaporate.
67. A separating funnel works on the basis of
A. Size difference
B. Density difference of immiscible liquids ← Correct Answer
C. Solubility difference
D. Magnetic property
Explanation:
B) Correct — heavier liquid settles below, lighter floats above.
68. The method of separating two immiscible liquids is
A. Filtration
B. Evaporation
C. Separating funnel ← Correct Answer
D. Sieving
Explanation:
C) Correct — example: oil and water separation.
69. Which of these mixtures can be separated by magnetic separation?
A. Sugar and water
B. Oil and water
C. Iron filings and sand ← Correct Answer
D. Salt and sugar
Explanation:
C) Correct — magnet attracts iron only.
70. Which of these can be separated by sieving?
A. Salt and water
B. Flour and husk ← Correct Answer
C. Oil and water
D. Sugar solution
Explanation:
B) Correct — sieve separates large husk particles from flour.
71. Crystals of salt are obtained from sea water by
A. Filtration
B. Evaporation and crystallization ← Correct Answer
C. Sieving
D. Winnowing
Explanation:
B) Correct — water evaporates, salt crystallizes.
72. Which of these can be purified by distillation?
A. Muddy water
B. Sea water (to get pure water) ← Correct Answer
C. Sand
D. Air
Explanation:
B) Correct — distillation removes salts/impurities, leaves pure water.
73. The separation technique used in making perfumes is
A. Sieving
B. Distillation ← Correct Answer
C. Sedimentation
D. Winnowing
Explanation:
B) Correct — perfumes prepared by distillation of essential oils.
74. Which method separates different gases from air?
A. Filtration
B. Sieving
C. Fractional distillation ← Correct Answer
D. Winnowing
Explanation:
C) Correct — liquid air separated into nitrogen, oxygen, etc.
75. Which property is used in sublimation?
A. Size difference
B. Ability of solid to change directly into gas ← Correct Answer
C. Magnetic property
D. Solubility difference
Explanation:
B) Correct — some solids like camphor sublime directly.
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