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Question (11)

QN0031378

A student prepares a salt solution and wants to obtain both pure water and salt separately. Which method should be used?

(A) Filtration
(B) Sedimentation
(C) Distillation
(D) Winnowing

Correct Answer: C

Explanation:

Distillation involves evaporation followed by condensation. Water is collected separately, while salt remains in the container.

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Question (12)

QN0031379

While cleaning wheat grains, Meera notices a few small stones, husk and dust mixed with them. Which combination of methods will remove all the unwanted materials most effectively?

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

Correct Answer: B

Explanation:

Small stones are removed by handpicking. The lighter husk and dust are then separated by winnowing.

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Question (13)

QN0031380

Which of the following mixtures cannot be separated effectively by filtration?

(A) Sand and water
(B) Mud and water
(C) Tea leaves and tea
(D) Salt dissolved in water

Correct Answer: D

Explanation:

Dissolved salt passes through the filter along with water. Filtration only separates insoluble solids.

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Question (14)

QN0031381

Four mixtures are given below. P. Butter from curd Q. Husk from wheat grains R. Sand from water S. Bran from flour. Which option gives the correct order of methods used?

(A) Churning, Winnowing, Filtration, Sieving
(B) Sieving, Filtration, Winnowing, Churning
(C) Churning, Sieving, Decantation, Handpicking
(D) Winnowing, Churning, Filtration, Magnetic separation

Correct Answer: A

Explanation:

Butter is obtained by churning, husk by winnowing, sand by filtration and bran by sieving.

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Question (15)

QN0031382

A mixture contains common salt, iron filings and sand. Which sequence of methods should be followed to obtain all three components separately?

(A) Filtration → Magnetic separation → Evaporation
(B) Magnetic separation → Dissolve in water → Filtration → Evaporation
(C) Sieving → Winnowing → Filtration
(D) Handpicking → Churning → Evaporation

Correct Answer: B

Explanation:

Remove iron using a magnet. Dissolve salt in water, filter out sand and then evaporate the water to recover salt.

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Question (16)

QN0031383

A construction worker uses a sieve while preparing sand for making cement. What is the main purpose of sieving here?

(A) To remove dissolved impurities
(B) To separate larger stones and pebbles from fine sand
(C) To dry the sand quickly
(D) To separate magnetic particles

Correct Answer: B

Explanation:

Sieving separates solids based on differences in particle size. Larger stones remain on the sieve while fine sand passes through.

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Question (17)

QN0031384

A mixture contains sawdust, rice grains and iron nails. Which sequence of methods is the most appropriate?

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

Correct Answer: A

Explanation:

First remove the iron nails with a magnet. Then use winnowing to separate the lighter sawdust from the heavier rice grains.

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Question (18)

QN0031385

Which statement is NOT correct about separation methods?

(A) Filtration separates insoluble solids from liquids.
(B) Winnowing requires a difference in weight of the components.
(C) Churning separates butter because butter is lighter than buttermilk.
(D) Handpicking is suitable when a large amount of unwanted material is mixed with grains.

Correct Answer: D

Explanation:

Handpicking is suitable only when the unwanted material is present in a small quantity and can be picked easily.

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Question (19)

QN0031386

A student has to separate a mixture of mud, salt and water. Which sequence of methods will recover the salt?

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

Correct Answer: A

Explanation:

First remove the insoluble mud by filtration. Then evaporate the water to obtain the dissolved salt.

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Question (20)

QN0031387

A science teacher gives four statements. 1. Threshing separates grains from stalks. 2. Decantation is useful only after heavier particles settle down. 3. A magnet can separate copper filings from sand. 4. Evaporation is useful for obtaining salt from salt solution. Which of the following is correct?

(A) 1, 2 and 4 only
(B) 1 and 3 only
(C) 2, 3 and 4 only
(D) All four statements are correct

Correct Answer: A

Explanation:

Copper is a non-magnetic metal and cannot be separated using a magnet. The other three statements are correct.

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Question (11)

A student prepares a salt solution and wants to obtain both pure water and salt separately. Which method should be used?

Explanation:

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Question (12)

While cleaning wheat grains, Meera notices a few small stones, husk and dust mixed with them. Which combination of methods will remove all the unwanted materials most effectively?

Explanation:

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Question (13)

Which of the following mixtures cannot be separated effectively by filtration?

Explanation:

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Question (14)

Four mixtures are given below. P. Butter from curd Q. Husk from wheat grains R. Sand from water S. Bran from flour. Which option gives the correct order of methods used?

Explanation:

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Question (15)

A mixture contains common salt, iron filings and sand. Which sequence of methods should be followed to obtain all three components separately?

Explanation:

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Question (16)

A construction worker uses a sieve while preparing sand for making cement. What is the main purpose of sieving here?

Explanation:

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Question (17)

A mixture contains sawdust, rice grains and iron nails. Which sequence of methods is the most appropriate?

Explanation:

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Question (18)

Which statement is NOT correct about separation methods?

Explanation:

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Question (19)

A student has to separate a mixture of mud, salt and water. Which sequence of methods will recover the salt?

Explanation:

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Question (20)

Explanation:

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