Methods of Separation in Everyday Life Part 4: MCQs (Q76–Q100)
Part 4 — Questions 76 to 100 (Complete revision & higher-order thinking)
76. Which method is used to separate sand and salt?
A. Filtration only
B. Dissolving salt, filtration, then evaporation ← Correct Answer
C. Winnowing
D. Sieving
Explanation:
B) Correct — salt dissolves, sand filtered, salt recovered by evaporation.
77. Which of these uses evaporation in daily life?
A. Filtering tea
B. Drying clothes in sun ← Correct Answer
C. Winnowing rice
D. Churning curd
Explanation:
B) Correct — water evaporates, clothes dry.
78. The process used to separate mixture of colors in ink is
A. Distillation
B. Chromatography ← Correct Answer
C. Sieving
D. Decantation
Explanation:
B) Correct — chromatography separates pigments by absorption.
79. Separation of grains after harvesting is called
A. Winnowing
B. Threshing ← Correct Answer
C. Sieving
D. Churning
Explanation:
B) Correct — threshing loosens grains from husk/stalk.
80. Which separation method uses a porous barrier?
A. Filtration ← Correct Answer
B. Distillation
C. Winnowing
D. Decantation
Explanation:
A) Correct — filter paper acts as porous barrier.
81. Why does salt remain behind when seawater is evaporated?
A. Salt is lighter
B. Salt does not evaporate ← Correct Answer
C. Water pushes salt down
D. Salt dissolves again
Explanation:
B) Correct — salt is non-volatile, remains as solid.
82. The process used to separate wheat bran from flour is
A. Winnowing
B. Sieving ← Correct Answer
C. Sedimentation
D. Filtration
Explanation:
B) Correct — sieve separates fine flour from husk particles.
83. To separate oil and water at home, one should use
A. Decantation ← Correct Answer
B. Filtration
C. Sieving
D. Evaporation
Explanation:
A) Correct — oil floats, water carefully poured out.
84. Which separation method is used in a washing machine spin-dryer?
A. Filtration
B. Centrifugation ← Correct Answer
C. Sedimentation
D. Sieving
Explanation:
B) Correct — spinning removes water from clothes.
85. What remains on filter paper when muddy water is filtered?
A. Filtrate
B. Residue (mud) ← Correct Answer
C. Supernatant
D. Distillate
Explanation:
B) Correct — solid impurities remain as residue.
86. Which method is used to separate kerosene from water?
A. Evaporation
B. Sieving
C. Separating funnel ← Correct Answer
D. Filtration
Explanation:
C) Correct — immiscible liquids separated by density.
87. The method used to obtain pure water from seawater is
A. Filtration
B. Distillation ← Correct Answer
C. Sieving
D. Winnowing
Explanation:
B) Correct — water vapor collected, leaving salt behind.
88. Which property is used in magnetic separation?
A. Density
B. Magnetic property of iron ← Correct Answer
C. Solubility
D. Particle size
Explanation:
B) Correct — magnet attracts iron-containing substances.
89. Which method separates gases in air?
A. Filtration
B. Sedimentation
C. Fractional distillation ← Correct Answer
D. Sieving
Explanation:
C) Correct — gases separated after cooling to liquid air.
90. In chromatography, separation is based on
A. Density difference
B. Magnetic property
C. Different absorption rates ← Correct Answer
D. Particle size
Explanation:
C) Correct — components move at different rates on paper.
91. Which method separates butter from milk in villages?
A. Sieving
B. Churning ← Correct Answer
C. Sedimentation
D. Winnowing
Explanation:
B) Correct — traditional churning separates butter.
92. The clear liquid above sediments is called
A. Filtrate
B. Residue
C. Supernatant liquid ← Correct Answer
D. Slurry
Explanation:
C) Correct — supernatant is liquid above settled solids.
93. Which method is used in preparing jaggery (gur) from sugarcane juice?
A. Filtration
B. Evaporation ← Correct Answer
C. Sieving
D. Winnowing
Explanation:
B) Correct — juice boiled, water evaporates, leaving jaggery.
94. The mixture of oil and water is separated by
A. Sieving
B. Decantation or separating funnel ← Correct Answer
C. Filtration
D. Evaporation
Explanation:
B) Correct — immiscible liquids separate easily.
95. Which method separates pebbles from pulses?
A. Handpicking ← Correct Answer
B. Sieving
C. Winnowing
D. Decantation
Explanation:
A) Correct — visible impurities removed by hand.
96. Which method separates volatile and non-volatile components?
A. Sieving
B. Distillation ← Correct Answer
C. Winnowing
D. Filtration
Explanation:
B) Correct — volatile part vaporizes, condensed back, others remain.
97. Why is filtration not useful to separate salt from water?
A. Filter gets blocked
B. Salt is dissolved, passes through filter ← Correct Answer
C. Salt is heavier
D. Filter absorbs salt
Explanation:
B) Correct — dissolved substances cannot be separated by filtration.
98. The separation of grains from stalks is done by
A. Winnowing
B. Sieving
C. Threshing ← Correct Answer
D. Filtration
Explanation:
C) Correct — threshing loosens grain from stalks.
99. Which process is used in making drinking water safe?
A. Winnowing
B. Sedimentation, filtration, and chlorination ← Correct Answer
C. Sieving only
D. Sublimation
Explanation:
B) Correct — multiple steps remove impurities and kill germs.
100. Final revision: Which statement is true?
A. Sieving separates dissolved substances
B. Evaporation is used to obtain salt from seawater ← Correct Answer
C. Filtration separates miscible liquids
D. Winnowing separates sand from water
Explanation:
B) Correct — evaporation leaves solid salt behind.
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