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Question (1)

QN0031368

A farmer has harvested wheat. The grains are still attached to the dry stalks. Which sequence of methods should he use to obtain clean grains?

(A) Winnowing → Threshing
(B) Threshing → Winnowing
(C) Sieving → Handpicking
(D) Filtration → Evaporation

Correct Answer: B

Explanation:

First, threshing separates the grains from the stalks. Then, winnowing removes the lighter husk from the heavier grains.

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Question (2)

QN0031369

Rina mixed sand, iron filings and common salt. She first removed the iron filings using a magnet. After adding water, which method should she use next to separate sand from the salt solution?

(A) Winnowing
(B) Filtration
(C) Churning
(D) Sieving

Correct Answer: B

Explanation:

Sand is insoluble in water while salt dissolves. Filtration separates the insoluble sand from the salt solution.

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Question (3)

QN0031370

Which of the following pairs is correctly matched?

(A) Butter from curd — Sieving
(B) Husk from grains — Filtration
(C) Bran from flour — Sieving
(D) Salt from seawater — Handpicking

Correct Answer: C

Explanation:

Bran particles are larger than flour particles, so sieving separates them effectively.

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Question (4)

QN0031371

A student wants to separate a mixture of rice, husk and small stones. Which sequence will give clean rice with minimum effort?

(A) Winnowing → Handpicking
(B) Handpicking → Winnowing
(C) Filtration → Winnowing
(D) Sieving → Evaporation

Correct Answer: B

Explanation:

Remove the stones first by handpicking, then use winnowing to separate the lighter husk from the rice.

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Question (5)

QN0031372

A carpenter accidentally mixes iron nails with sawdust and wooden chips. Which property makes magnetic separation possible?

(A) Difference in colour
(B) Difference in shape
(C) Difference in magnetic nature
(D) Difference in solubility

Correct Answer: C

Explanation:

Iron nails are attracted by a magnet, whereas sawdust and wooden chips are non-magnetic.

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Question (6)

QN0031373

A cook pours tea directly from the pan after allowing it to stand for some time. A few tea leaves still enter the cup. Why?

(A) Tea leaves dissolve in tea.
(B) Decantation does not remove all solid particles completely.
(C) Tea leaves are lighter than tea.
(D) Tea leaves evaporate.

Correct Answer: B

Explanation:

During decantation, some tea leaves may still flow with the liquid. A strainer provides better separation.

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Question (7)

QN0031374

Four students suggest different methods to separate a mixture of sand and water. Student A: Filtration Student B: Sedimentation followed by decantation Student C: Evaporation Student D: Sieving Which students have suggested suitable methods?

(A) A only
(B) A and B only
(C) A, B and C only
(D) A, B, C and D

Correct Answer: C

Explanation:

Filtration, sedimentation followed by decantation, and evaporation can separate sand from water. Sieving is not suitable because sand particles pass through ordinary sieves with water.

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Question (8)

QN0031375

A student has three mixtures: I. Wheat flour and bran II. Oil and water III. Iron filings and sulphur powder Which set of methods is correct?

(A) I–Sieving, II–Decantation, III–Magnetic separation
(B) I–Filtration, II–Winnowing, III–Sieving
(C) I–Handpicking, II–Evaporation, III–Threshing
(D) I–Decantation, II–Churning, III–Filtration

Correct Answer: A

Explanation:

Each method matches the property on which separation is based: particle size, immiscibility and magnetic property.

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Question (9)

QN0031376

Which statement best explains why winnowing works?

(A) Wind dissolves the husk.
(B) Wind carries away the lighter particles while heavier grains fall nearby.
(C) Wind melts the husk.
(D) Wind changes husk into dust.

Correct Answer: B

Explanation:

Winnowing depends on the difference in weight of the components. The lighter husk is blown farther by moving air.

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Question (10)

QN0031377

A mixture contains iron nails, pebbles, salt, sand and water. Which sequence correctly separates all the components?

(A) Evaporation → Magnetic separation → Filtration
(B) Magnetic separation → Filtration → Evaporation
(C) Filtration → Winnowing → Churning
(D) Sieving → Decantation → Magnetic separation

Correct Answer: B

Explanation:

First remove iron nails using a magnet. Then filter to separate the insoluble sand and pebbles from the salt solution. Finally, evaporate the water to obtain the salt.

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Question (1)

A farmer has harvested wheat. The grains are still attached to the dry stalks. Which sequence of methods should he use to obtain clean grains?

Explanation:

Link:

Question (2)

Rina mixed sand, iron filings and common salt. She first removed the iron filings using a magnet. After adding water, which method should she use next to separate sand from the salt solution?

Explanation:

Link:

Question (3)

Which of the following pairs is correctly matched?

Explanation:

Link:

Question (4)

A student wants to separate a mixture of rice, husk and small stones. Which sequence will give clean rice with minimum effort?

Explanation:

Link:

Question (5)

A carpenter accidentally mixes iron nails with sawdust and wooden chips. Which property makes magnetic separation possible?

Explanation:

Link:

Question (6)

A cook pours tea directly from the pan after allowing it to stand for some time. A few tea leaves still enter the cup. Why?

Explanation:

Link:

Question (7)

Four students suggest different methods to separate a mixture of sand and water. Student A: Filtration Student B: Sedimentation followed by decantation Student C: Evaporation Student D: Sieving Which students have suggested suitable methods?

Explanation:

Link:

Question (8)

A student has three mixtures: I. Wheat flour and bran II. Oil and water III. Iron filings and sulphur powder Which set of methods is correct?

Explanation:

Link:

Question (9)

Which statement best explains why winnowing works?

Explanation:

Link:

Question (10)

A mixture contains iron nails, pebbles, salt, sand and water. Which sequence correctly separates all the components?

Explanation:

Link:

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