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Question (31)

QN005032

If 240 iron nails are mixed with sawdust and 210 nails are collected using a magnet, how many nails remain?

(A) 20
(B) 25
(C) 30
(D) 35

Correct Answer: C

Explanation:

240 − 210 = 30 nails.

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Question (32)

QN005033

Which factor directly determines whether a substance can be separated by a magnet?

(A) Taste
(B) Colour
(C) Magnetic property
(D) Density

Correct Answer: C

Explanation:

Only magnetic substances are attracted by magnets.

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Question (33)

QN005034

A worker passes a magnet three times through a mixture and removes all magnetic particles. What does this show?

(A) Magnetic separation can be repeated for better results
(B) Magnets increase particle size
(C) Magnets dissolve substances
(D) Magnets change colour of substances

Correct Answer: A

Explanation:

Repeated magnetic separation improves efficiency.

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Question (34)

QN005035

Which material would remain after passing a magnet through a mixture of iron filings and rice grains?

(A) Iron filings only
(B) Rice grains only
(C) Both materials
(D) Neither material

Correct Answer: B

Explanation:

Iron filings are removed; rice grains remain.

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Question (35)

QN005036

A recycling unit processes 500 kg of mixed waste containing 120 kg of iron scrap. If all iron scrap is removed magnetically, how much non-magnetic waste remains?

(A) 120 kg
(B) 250 kg
(C) 380 kg
(D) 500 kg

Correct Answer: C

Explanation:

500 − 120 = 380 kg.

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Question (36)

QN005037

Which of the following cannot be separated by magnetic separation?

(A) Iron nails and sawdust
(B) Iron filings and sand
(C) Plastic pieces and paper pieces
(D) Iron pins and rice grains

Correct Answer: C

Explanation:

Neither plastic nor paper is magnetic.

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Question (37)

QN005038

What is the main advantage of magnetic separation over handpicking for iron nails mixed with sawdust?

(A) It is faster and more efficient
(B) It requires heating
(C) It dissolves iron nails
(D) It changes the shape of nails

Correct Answer: A

Explanation:

Magnets can collect many iron nails at once.

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Question (38)

QN005039

A mixture contains 90 magnetic particles and 210 non-magnetic particles. After complete magnetic separation, how many particles remain in the mixture?

(A) 90
(B) 120
(C) 210
(D) 300

Correct Answer: C

Explanation:

Only the 210 non-magnetic particles remain.

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Question (39)

QN005040

Which social benefit is associated with magnetic separation in recycling industries?

(A) Increased waste accumulation
(B) Recovery and reuse of valuable iron scrap
(C) Increased air pollution
(D) Destruction of recyclable materials

Correct Answer: B

Explanation:

Recovered iron scrap can be recycled and reused.

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Question (40)

QN005041

A scientist receives a mixture of iron filings, sand, and rice grains. Which method should be applied first to simplify the separation process?

(A) Sieving
(B) Evaporation
(C) Magnetic separation
(D) Sedimentation

Correct Answer: C

Explanation:

Iron filings can be removed first using a magnet, making further separation easier.

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Question (31)

If 240 iron nails are mixed with sawdust and 210 nails are collected using a magnet, how many nails remain?

Explanation:

Link:

Question (32)

Which factor directly determines whether a substance can be separated by a magnet?

Explanation:

Link:

Question (33)

A worker passes a magnet three times through a mixture and removes all magnetic particles. What does this show?

Explanation:

Link:

Question (34)

Which material would remain after passing a magnet through a mixture of iron filings and rice grains?

Explanation:

Link:

Question (35)

A recycling unit processes 500 kg of mixed waste containing 120 kg of iron scrap. If all iron scrap is removed magnetically, how much non-magnetic waste remains?

Explanation:

Link:

Question (36)

Which of the following cannot be separated by magnetic separation?

Explanation:

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Question (37)

What is the main advantage of magnetic separation over handpicking for iron nails mixed with sawdust?

Explanation:

Link:

Question (38)

A mixture contains 90 magnetic particles and 210 non-magnetic particles. After complete magnetic separation, how many particles remain in the mixture?

Explanation:

Link:

Question (39)

Which social benefit is associated with magnetic separation in recycling industries?

Explanation:

Link:

Question (40)

A scientist receives a mixture of iron filings, sand, and rice grains. Which method should be applied first to simplify the separation process?

Explanation:

Link:

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