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Question (21)

QN006632

Which substance can be separated from sand by sublimation?

(A) Salt
(B) Chalk powder
(C) Camphor
(D) Iron filings

Correct Answer: C

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Question (22)

QN006633

During sublimation, vapours on cooling form:

(A) Liquid
(B) Crystals directly
(C) Plasma
(D) Solution

Correct Answer: B

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Question (23)

QN006634

Which process is commonly used in water purification plants to remove suspended impurities?

(A) Crystallization
(B) Coagulation
(C) Sublimation
(D) Fractional distillation

Correct Answer: B

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Question (24)

QN006635

Alum helps in purification of water by causing particles to:

(A) Evaporate
(B) Melt
(C) Clump together
(D) Freeze

Correct Answer: C

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Question (25)

QN006636

Which of the following is a heterogeneous mixture?

(A) Salt solution
(B) Sugar syrup
(C) Sand and water
(D) Vinegar

Correct Answer: C

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Question (26)

QN006637

A student wants to separate iron pins from sand. Which method should be used?

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

Correct Answer: B

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Question (27)

QN006638

Magnetic separation is based on difference in:

(A) Solubility
(B) Magnetism
(C) Density
(D) Colour

Correct Answer: B

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Question (28)

QN006639

Which method is suitable to separate chalk powder from water?

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

Correct Answer: B

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Question (29)

QN006640

A mixture of sand and water is allowed to stand. Sand settles down due to:

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

Correct Answer: B

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Question (30)

QN006641

The process of separating lighter and heavier components by wind is useful in:

(A) Tea preparation
(B) Agriculture
(C) Petroleum refining
(D) Distillation

Correct Answer: B

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Question (21)

Which substance can be separated from sand by sublimation?

Explanation:

Link:

Question (22)

During sublimation, vapours on cooling form:

Explanation:

Link:

Question (23)

Which process is commonly used in water purification plants to remove suspended impurities?

Explanation:

Link:

Question (24)

Alum helps in purification of water by causing particles to:

Explanation:

Link:

Question (25)

Which of the following is a heterogeneous mixture?

Explanation:

Link:

Question (26)

A student wants to separate iron pins from sand. Which method should be used?

Explanation:

Link:

Question (27)

Magnetic separation is based on difference in:

Explanation:

Link:

Question (28)

Which method is suitable to separate chalk powder from water?

Explanation:

Link:

Question (29)

A mixture of sand and water is allowed to stand. Sand settles down due to:

Explanation:

Link:

Question (30)

The process of separating lighter and heavier components by wind is useful in:

Explanation:

Link:

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