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Question (31)

QN006492

The process in which vapours directly convert into solid is called:

(A) Melting
(B) Freezing
(C) Deposition
(D) Distillation

Correct Answer: C

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Question (32)

QN006493

Which of the following is an alloy?

(A) Milk
(B) Brass
(C) Smoke
(D) Fog

Correct Answer: B

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Question (33)

QN006494

Brass mainly contains copper and:

(A) Iron
(B) Nickel
(C) Zinc
(D) Tin

Correct Answer: C

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Question (34)

QN006495

Particles in a suspension are:

(A) Invisible to naked eye
(B) Smaller than solution particles
(C) Visible to naked eye
(D) Permanently dissolved

Correct Answer: C

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Question (35)

QN006496

Which method is commonly used to separate plasma from blood?

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

Correct Answer: C

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Question (36)

QN006497

In centrifugation, heavier particles move:

(A) Towards the centre
(B) Outwards and settle down
(C) Upwards in air
(D) Randomly

Correct Answer: B

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Question (37)

QN006498

Alum helps in water purification by process of:

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

Correct Answer: C

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Question (38)

QN006499

In coagulation, fine suspended particles:

(A) Evaporate
(B) Melt completely
(C) Clump together
(D) Change into gas

Correct Answer: C

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Question (39)

QN006500

Milk is classified as a:

(A) True solution
(B) Suspension
(C) Colloid
(D) Pure substance

Correct Answer: C

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Question (40)

QN006501

Particle size in colloids generally lies between:

(A) Less than 1 nm
(B) 1–1000 nm
(C) More than 10000 nm
(D) Exactly 1000 nm

Correct Answer: B

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