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Question (1)

QN002711

Which of the following best defines a pure substance in science?

(A) A substance sold in sealed packets
(B) A substance containing many components
(C) A substance having only one type of particles
(D) A substance that looks clean

Correct Answer: C

Explanation:

A pure substance contains only one type of particles.

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Question (2)

QN002712

In science, a pure substance can be separated into other substances by

(A) filtration only
(B) evaporation only
(C) physical processes
(D) no physical process

Correct Answer: D

Explanation:

Pure substances cannot be separated by physical methods.

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Question (3)

QN002713

Which of the following is considered a pure substance in science?

(A) Air
(B) Seawater
(C) Oxygen
(D) Soil

Correct Answer: C

Explanation:

Oxygen contains only one kind of particles.

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Question (4)

QN002714

Adulteration refers to

(A) purifying a substance
(B) adding cheaper or poor-quality substances
(C) separating mixtures
(D) heating a compound

Correct Answer: B

Explanation:

Adulteration reduces the quality of products.

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Question (5)

QN002715

Which of the following may become hazardous to health due to adulteration?

(A) Pure oxygen
(B) Pure gold
(C) Consumable products
(D) Distilled water

Correct Answer: C

Explanation:

Adulterated consumable products can harm health.

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Question (6)

QN002716

Which statement correctly explains “pure” in common usage?

(A) Substance has one type of particle only
(B) Substance cannot be physically separated
(C) Product is unadulterated
(D) Product contains only atoms

Correct Answer: C

Explanation:

In daily life, pure means unadulterated.

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Question (7)

QN002717

A scientist tests a sample of milk and finds water mixed in it. According to science, the milk sample is

(A) pure
(B) impure
(C) element
(D) compound

Correct Answer: B

Explanation:

Presence of another substance makes it impure.

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Question (8)

QN002718

Which of the following is NOT considered a pure substance according to science?

(A) Sugar
(B) Oxygen
(C) Air
(D) Baking soda

Correct Answer: C

Explanation:

Air is a mixture of gases.

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Question (9)

QN002719

A packet of ghee claims to be “100% pure”. In scientific terms, this statement may still be incorrect because

(A) ghee is colourless
(B) ghee may contain more than one substance
(C) ghee is always adulterated
(D) ghee is a gas

Correct Answer: B

Explanation:

Scientifically, a pure substance contains only one kind of particles.

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Question (10)

QN002720

Which of the following is most likely to be classified as a mixture rather than a pure substance?

(A) Soil
(B) Oxygen
(C) Gold
(D) Sulfur

Correct Answer: A

Explanation:

Soil contains many different substances mixed together.

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Question (1)

Which of the following best defines a pure substance in science?

Explanation:

Link:

Question (2)

In science, a pure substance can be separated into other substances by

Explanation:

Link:

Question (3)

Which of the following is considered a pure substance in science?

Explanation:

Link:

Question (4)

Adulteration refers to

Explanation:

Link:

Question (5)

Which of the following may become hazardous to health due to adulteration?

Explanation:

Link:

Question (6)

Which statement correctly explains “pure” in common usage?

Explanation:

Link:

Question (7)

A scientist tests a sample of milk and finds water mixed in it. According to science, the milk sample is

Explanation:

Link:

Question (8)

Which of the following is NOT considered a pure substance according to science?

Explanation:

Link:

Question (9)

A packet of ghee claims to be “100% pure”. In scientific terms, this statement may still be incorrect because

Explanation:

Link:

Question (10)

Which of the following is most likely to be classified as a mixture rather than a pure substance?

Explanation:

Link:

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