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Question (41)

QN006652

During centrifugation of blood, plasma is obtained because components differ in:

(A) Boiling point
(B) Colour
(C) Density
(D) Solubility

Correct Answer: C

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Question (42)

QN006653

Which of the following mixtures can be separated by decantation?

(A) Sugar in water
(B) Salt in water
(C) Sand in water
(D) Alcohol in water

Correct Answer: C

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Question (43)

QN006654

A student mixes 200 g sand with water. After sedimentation, 180 g sand settles. Percentage of sand settled is:

(A) 80%
(B) 85%
(C) 90%
(D) 95%

Correct Answer: C

Explanation:

(180/200) × 100 = 90%

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Question (44)

QN006655

A centrifuge separates 500 mL milk into 50 mL cream and remaining skimmed milk. Volume of skimmed milk obtained is:

(A) 400 mL
(B) 425 mL
(C) 450 mL
(D) 475 mL

Correct Answer: C

Explanation:

500 – 50 = 450 mL

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Question (45)

QN006656

A mixture contains 300 g wheat grains and 30 g husk. Percentage of husk is:

(A) 5%
(B) 8%
(C) 9%
(D) 10%

Correct Answer: C

Explanation:

(30/330) × 100 ≈ 9%

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Question (46)

QN006657

Which process is best for separating magnetic impurities from food grains in industries?

(A) Magnetic separation
(B) Sedimentation
(C) Filtration
(D) Winnowing

Correct Answer: A

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Question (47)

QN006658

A separating funnel works effectively only when liquids are:

(A) Miscible
(B) Immiscible
(C) Coloured
(D) Solids

Correct Answer: B

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Question (48)

QN006659

Which method helps reduce water-borne diseases by removing suspended impurities from drinking water?

(A) Coagulation and filtration
(B) Sublimation
(C) Crystallization
(D) Distillation only

Correct Answer: A

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Question (49)

QN006660

A student uses a sieve with very small holes. Which particles will pass through?

(A) Larger particles only
(B) Smaller particles only
(C) All particles
(D) No particles

Correct Answer: B

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Question (50)

QN006661

Which method among the following does NOT involve heating?

(A) Sublimation
(B) Filtration
(C) Evaporation
(D) Distillation

Correct Answer: B

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Question (41)

During centrifugation of blood, plasma is obtained because components differ in:

Explanation:

Link:

Question (42)

Which of the following mixtures can be separated by decantation?

Explanation:

Link:

Question (43)

A student mixes 200 g sand with water. After sedimentation, 180 g sand settles. Percentage of sand settled is:

Explanation:

Link:

Question (44)

A centrifuge separates 500 mL milk into 50 mL cream and remaining skimmed milk. Volume of skimmed milk obtained is:

Explanation:

Link:

Question (45)

A mixture contains 300 g wheat grains and 30 g husk. Percentage of husk is:

Explanation:

Link:

Question (46)

Which process is best for separating magnetic impurities from food grains in industries?

Explanation:

Link:

Question (47)

A separating funnel works effectively only when liquids are:

Explanation:

Link:

Question (48)

Which method helps reduce water-borne diseases by removing suspended impurities from drinking water?

Explanation:

Link:

Question (49)

A student uses a sieve with very small holes. Which particles will pass through?

Explanation:

Link:

Question (50)

Which method among the following does NOT involve heating?

Explanation:

Link:

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