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Question (21)

QN005022

A recycler uses a crane fitted with a magnet. What is its main purpose?

(A) To separate water from waste
(B) To separate iron scrap from waste materials
(C) To separate oil from water
(D) To separate flour from bran

Correct Answer: B

Explanation:

Large magnets are used in recycling yards to collect iron scrap.

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Question (22)

QN005023

If a mixture contains 120 iron filings and 30 are left behind after magnetic separation, how many filings were collected?

(A) 80
(B) 90
(C) 100
(D) 110

Correct Answer: B

Explanation:

120 − 30 = 90 filings.

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Question (23)

QN005024

Which characteristic is essential for magnetic separation to work?

(A) One component must dissolve in water
(B) One component must be magnetic
(C) One component must be lighter
(D) One component must evaporate

Correct Answer: B

Explanation:

At least one component must be attracted by a magnet.

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Question (24)

QN005025

A student mixes iron pins, plastic beads and paper pieces. Which items will a magnet attract?

(A) Plastic beads only
(B) Paper pieces only
(C) Iron pins only
(D) All items

Correct Answer: C

Explanation:

Iron is magnetic; plastic and paper are non-magnetic.

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Question (25)

QN005026

A magnet removes 150 iron particles from a mixture. If the mixture originally contained 175 iron particles, what percentage remains unseparated?

(A) 10%
(B) 12.5%
(C) 14.3%
(D) 20%

Correct Answer: C

Explanation:

Remaining particles = 175 − 150 = 25; (25/175) × 100 ≈ 14.3%.

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Question (26)

QN005027

Why are magnets useful in recycling centres?

(A) They separate magnetic metals from mixed waste
(B) They dissolve waste materials
(C) They burn waste materials
(D) They filter liquids

Correct Answer: A

Explanation:

Magnets help recover valuable magnetic metals.

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Question (27)

QN005028

Which pair can be separated effectively using magnetic separation?

(A) Sand and sugar
(B) Iron filings and sulfur powder
(C) Salt and water
(D) Oil and water

Correct Answer: B

Explanation:

Iron filings are magnetic while sulfur powder is not.

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Question (28)

QN005029

A mixture contains equal masses of iron filings and sand. After magnetic separation, which component remains behind?

(A) Iron filings
(B) Sand
(C) Both components
(D) Neither component

Correct Answer: B

Explanation:

The magnet removes iron filings, leaving sand behind.

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Question (29)

QN005030

Which statement about magnetic substances is correct?

(A) They are attracted towards magnets
(B) They dissolve in water
(C) They float on water
(D) They are always lighter than air

Correct Answer: A

Explanation:

Attraction towards magnets is the defining property of magnetic substances.

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Question (30)

QN005031

A school laboratory has a mixture of iron powder and chalk powder. Which method is most suitable for separation?

(A) Sedimentation
(B) Decantation
(C) Magnetic separation
(D) Churning

Correct Answer: C

Explanation:

Iron powder can be removed with a magnet.

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Question (21)

A recycler uses a crane fitted with a magnet. What is its main purpose?

Explanation:

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Question (22)

If a mixture contains 120 iron filings and 30 are left behind after magnetic separation, how many filings were collected?

Explanation:

Link:

Question (23)

Which characteristic is essential for magnetic separation to work?

Explanation:

Link:

Question (24)

A student mixes iron pins, plastic beads and paper pieces. Which items will a magnet attract?

Explanation:

Link:

Question (25)

A magnet removes 150 iron particles from a mixture. If the mixture originally contained 175 iron particles, what percentage remains unseparated?

Explanation:

Link:

Question (26)

Why are magnets useful in recycling centres?

Explanation:

Link:

Question (27)

Which pair can be separated effectively using magnetic separation?

Explanation:

Link:

Question (28)

A mixture contains equal masses of iron filings and sand. After magnetic separation, which component remains behind?

Explanation:

Link:

Question (29)

Which statement about magnetic substances is correct?

Explanation:

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Question (30)

A school laboratory has a mixture of iron powder and chalk powder. Which method is most suitable for separation?

Explanation:

Link:

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