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Question (31)

QN004972

A mixture contains rice flour and small pebbles. Which method is most appropriate?

(A) Churning
(B) Sedimentation
(C) Sieving
(D) Evaporation

Correct Answer: C

Explanation:

Sieving separates particles of different sizes.

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Question (32)

QN004973

Which condition is necessary for successful handpicking?

(A) One component should be present in small quantity and easily visible
(B) Components should be liquids
(C) Components should be magnetic
(D) Components should dissolve in water

Correct Answer: A

Explanation:

Handpicking is practical only when the unwanted component is present in small quantity.

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Question (33)

QN004974

In a closed room without airflow, winnowing becomes difficult because:

(A) Grains become heavier
(B) Husk dissolves
(C) Wind is needed to carry lighter particles away
(D) The tray becomes magnetic

Correct Answer: C

Explanation:

Winnowing depends on moving air to separate lighter particles.

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Question (34)

QN004975

Oil and water form separate layers when left undisturbed. Which method can be used to separate them?

(A) Decantation
(B) Threshing
(C) Churning
(D) Sieving

Correct Answer: A

Explanation:

The upper layer can be carefully poured off by decantation.

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Question (35)

QN004976

Which statement best explains filtration?

(A) Separation based on colour difference
(B) Separation using differences in magnetic properties
(C) Separation of insoluble solids from liquids using a filter
(D) Separation using wind

Correct Answer: C

Explanation:

Filtration separates insoluble solids from liquids through a filtering medium.

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Question (36)

QN004977

A mixture contains iron filings, sand, and water. Which substance should be separated first for the easiest process?

(A) Water by evaporation
(B) Sand by filtration
(C) Iron filings by magnet
(D) Water by churning

Correct Answer: C

Explanation:

Magnetic separation is the simplest first step.

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Question (37)

QN004978

A student wants to recover both salt and water from salt solution. Which statement is correct?

(A) Simple filtration can recover both
(B) Handpicking can recover both
(C) Ordinary evaporation recovers mainly salt, not water
(D) Winnowing recovers both

Correct Answer: C

Explanation:

In simple evaporation, water escapes as vapour and is not collected.

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Question (38)

QN004979

Why are threshers widely used in agriculture?

(A) They perform only filtration
(B) They perform both threshing and winnowing efficiently
(C) They dissolve husk in water
(D) They separate magnetic materials

Correct Answer: B

Explanation:

Modern threshers separate grains and remove husk efficiently.

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Question (39)

QN004980

Which of the following is an example of separating two useful components?

(A) Removing stones from rice
(B) Separating butter from curd
(C) Removing mud from water
(D) Removing husk from grains

Correct Answer: B

Explanation:

Butter and buttermilk are both useful products.

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Question (40)

QN004981

A scientist receives a mixture of iron nails, husk, and wheat grains. Which sequence of methods is most logical?

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

Correct Answer: B

Explanation:

First remove iron nails using a magnet, then separate husk from grains by winnowing.

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Question (31)

A mixture contains rice flour and small pebbles. Which method is most appropriate?

Explanation:

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Question (32)

Which condition is necessary for successful handpicking?

Explanation:

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Question (33)

In a closed room without airflow, winnowing becomes difficult because:

Explanation:

Link:

Question (34)

Oil and water form separate layers when left undisturbed. Which method can be used to separate them?

Explanation:

Link:

Question (35)

Which statement best explains filtration?

Explanation:

Link:

Question (36)

A mixture contains iron filings, sand, and water. Which substance should be separated first for the easiest process?

Explanation:

Link:

Question (37)

A student wants to recover both salt and water from salt solution. Which statement is correct?

Explanation:

Link:

Question (38)

Why are threshers widely used in agriculture?

Explanation:

Link:

Question (39)

Which of the following is an example of separating two useful components?

Explanation:

Link:

Question (40)

A scientist receives a mixture of iron nails, husk, and wheat grains. Which sequence of methods is most logical?

Explanation:

Link:

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