Winnowing & Sieving — Homi Bhabha Class 6 Chemistry MCQs with Solutions
Free Homi Bhabha Class 6 Chemistry Winnowing & Sieving MCQs with step-by-step solutions (10 questions). Part of Methods of Separation. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Winnowing & Sieving · easy · theory
Winnowing is mainly used to separate …
A. Two liquids
B. Salt from water
C. Iron from sand
D. Heavier grain from lighter husk ✓ Correct
Solution: Winnowing separates the heavier grain from the lighter husk (chaff).
Q2 — Winnowing & Sieving · easy · theory
Winnowing uses moving …
A. A magnet
B. Air (wind) ✓ Correct
C. Water
D. A filter
Solution: Winnowing uses wind (moving air) to blow away the light husk while the heavier grain falls straight down.
Q3 — Winnowing & Sieving · easy · theory
A sieve is used to separate things that are of different …
A. Tastes
B. Colours
C. Sizes ✓ Correct
D. Smells
Solution: A sieve has small holes, so it separates a mixture into parts of different sizes.
Q4 — Winnowing & Sieving · easy · theory
When flour is sieved, the fine flour passes through the holes and what stays back on the sieve?
A. Air
B. The larger bits of bran or husk ✓ Correct
C. Sugar
D. Water
Solution: The fine flour falls through the tiny holes, while the bigger pieces of bran or husk are too large and stay on the sieve.
Q5 — Winnowing & Sieving · medium · theory
A farmer drops a mixture of grain and husk from a height while the wind blows. Where does the lighter husk land?
A. Farther away, carried by the wind ✓ Correct
B. It sinks into the ground
C. It rises up into the sky forever
D. Straight below, with the grain
Solution: Being lighter, the husk is carried farther away by the wind, while the heavier grain falls straight down in a heap.
Q6 — Winnowing & Sieving · medium · theory
Which of these is best separated by sieving?
A. Iron nails from a heap of sand
B. Salt dissolved in water
C. Small stones mixed in wheat flour ✓ Correct
D. Oil floating on water
Solution: The stones and flour are of different sizes, so a sieve lets the fine flour pass and keeps the larger stones back.
Q7 — Winnowing & Sieving · medium · theory
Winnowing can separate husk from grain because …
A. The husk is lighter than the grain ✓ Correct
B. The husk dissolves in air
C. The grain is lighter than the husk
D. The husk is magnetic
Solution: The husk is much lighter than the grain, so the wind can blow it aside while the heavier grain falls down.
Q8 — Winnowing & Sieving · medium · theory
At a building site, a sieve is used to separate a mixture of sand and small pebbles. This works because the two are of different …
A. Weights only
B. Sizes ✓ Correct
C. Temperatures
D. Colours
Solution: The fine sand passes through the sieve holes while the larger pebbles stay back, so sieving works because of their different sizes.
Q9 — Winnowing & Sieving · hard · theory
Sieving can separate a mixture only when its parts are of …
A. Different sizes ✓ Correct
B. Different colours
C. The same size
D. The same weight
Solution: A sieve separates by size, so it works only when the pieces in the mixture are of clearly different sizes.
Q10 — Winnowing & Sieving · hard · theory
Which pair of things can be separated by winnowing?
A. Iron filings and sulphur
B. Husk and grain ✓ Correct
C. Sand and water
D. Sugar and salt
Solution: Winnowing needs one part to be much lighter than the other so the wind can blow it away; husk (light) and grain (heavy) fit this.