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Question (11)

QN0029006

Which of the following substances is most likely to be homogeneous?

(A) Fruit salad
(B) Sand and water
(C) Salt solution
(D) Oil and water

Correct Answer: C

Explanation:

Salt dissolves uniformly in water.

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Question (12)

QN0029007

A scientist identifies a mineral sample as quartz. Which property is most useful in glass manufacturing?

(A) Softness
(B) High silica content
(C) Magnetic behaviour
(D) Bitter taste

Correct Answer: B

Explanation:

Quartz provides silica needed for glass making.

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Question (13)

QN0029008

Which of the following is an example of adulteration?

(A) Cooling milk before storage
(B) Mixing water in milk
(C) Churning curd into butter
(D) Filtering fruit juice

Correct Answer: B

Explanation:

Adding unwanted substances lowers quality.

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Question (14)

QN0029009

A builder prefers concrete over pure cement for construction because concrete

(A) is a pure element
(B) provides greater strength and durability
(C) melts easily
(D) contains no water

Correct Answer: B

Explanation:

Concrete is strong and durable for construction work.

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Question (15)

QN0029010

Which process is mainly used to obtain minerals located deep beneath Earth’s surface?

(A) Filtration
(B) Underground mining
(C) Evaporation
(D) Condensation

Correct Answer: B

Explanation:

Deep mineral deposits require underground mining.

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Question (16)

QN0029011

A gas collected during an experiment gives a ‘pop’ sound near flame. The gas is most likely

(A) oxygen
(B) hydrogen
(C) nitrogen
(D) carbon dioxide

Correct Answer: B

Explanation:

Hydrogen burns with a pop sound.

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Question (17)

QN0029012

Which of the following combinations contains only mixtures?

(A) Air and soil
(B) Oxygen and copper
(C) Water and sodium chloride
(D) Iron and sulfur

Correct Answer: A

Explanation:

Both air and soil contain multiple substances mixed physically.

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Question (18)

QN0029013

A student adds chlorine to drinking water mainly to

(A) improve colour
(B) increase sweetness
(C) kill harmful microorganisms
(D) increase mineral content

Correct Answer: C

Explanation:

Chlorine disinfects water by killing germs.

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Question (19)

QN0029014

A sample contains particles that are identical throughout and cannot be separated physically. The sample is most likely

(A) a mixture
(B) a suspension
(C) a pure substance
(D) an alloy mixture only

Correct Answer: C

Explanation:

Pure substances contain only one kind of particles.

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Question (20)

QN0029015

Which statement best explains why minerals should be conserved carefully?

(A) Minerals form rapidly within days
(B) Minerals are unlimited resources
(C) Minerals take millions of years to form naturally
(D) Minerals are rarely used in daily life

Correct Answer: C

Explanation:

Minerals are non-renewable natural resources.

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Question (11)

Which of the following substances is most likely to be homogeneous?

Explanation:

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Question (12)

A scientist identifies a mineral sample as quartz. Which property is most useful in glass manufacturing?

Explanation:

Link:

Question (13)

Which of the following is an example of adulteration?

Explanation:

Link:

Question (14)

A builder prefers concrete over pure cement for construction because concrete

Explanation:

Link:

Question (15)

Which process is mainly used to obtain minerals located deep beneath Earth’s surface?

Explanation:

Link:

Question (16)

A gas collected during an experiment gives a ‘pop’ sound near flame. The gas is most likely

Explanation:

Link:

Question (17)

Which of the following combinations contains only mixtures?

Explanation:

Link:

Question (18)

A student adds chlorine to drinking water mainly to

Explanation:

Link:

Question (19)

A sample contains particles that are identical throughout and cannot be separated physically. The sample is most likely

Explanation:

Link:

Question (20)

Which statement best explains why minerals should be conserved carefully?

Explanation:

Link:

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