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Question (21)

QN002791

Steel is stronger than pure iron mainly because

(A) it is an alloy
(B) it contains only oxygen
(C) it is a gas
(D) it has no carbon

Correct Answer: A

Explanation:

Alloys often have improved properties.

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Question (22)

QN002792

Which compound is commonly used in antacid tablets?

(A) Sodium chloride
(B) Calcium carbonate
(C) Sulfur dioxide
(D) Iron sulfide

Correct Answer: B

Explanation:

Calcium carbonate neutralizes excess acid.

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Question (23)

QN002793

A jeweller mixes copper with gold to make ornaments stronger. This process forms

(A) an element
(B) a compound
(C) an alloy
(D) a gas mixture

Correct Answer: C

Explanation:

Mixing metals forms an alloy.

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Question (24)

QN002794

Which gas is used in balloons because it is lighter than air and non-flammable?

(A) Oxygen
(B) Hydrogen
(C) Helium
(D) Nitrogen

Correct Answer: C

Explanation:

Helium is lighter than air and safe.

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Question (25)

QN002795

Which compound is used in baking powder to make cakes soft and fluffy?

(A) Sodium bicarbonate
(B) Copper sulfate
(C) Iron oxide
(D) Sulfur powder

Correct Answer: A

Explanation:

Sodium bicarbonate releases carbon dioxide during baking.

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Question (26)

QN002796

Which of the following is a medicinal use of compounds?

(A) Oxygen in balloons
(B) Cement in buildings
(C) Glucose drip in hospitals
(D) Iron in bridges

Correct Answer: C

Explanation:

Glucose solutions are used in medical treatment.

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Question (27)

QN002797

A builder chooses stainless steel instead of iron for railings mainly because stainless steel

(A) melts easily
(B) corrodes less
(C) is non-metallic
(D) contains no iron

Correct Answer: B

Explanation:

Stainless steel is corrosion resistant.

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Question (28)

QN002798

Which mixture helps plants grow better by improving soil texture and nutrients?

(A) Bronze
(B) Compost
(C) Oxygen
(D) Silicon

Correct Answer: B

Explanation:

Compost enriches soil fertility.

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Question (29)

QN002799

Which element is most commonly used in thermometers?

(A) Bromine
(B) Mercury
(C) Sulfur
(D) Carbon

Correct Answer: B

Explanation:

Mercury is used in many thermometers.

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Question (30)

QN002800

Which property makes mercury suitable for thermometers?

(A) It is magnetic
(B) It expands uniformly with temperature
(C) It is brittle
(D) It reacts with glass easily

Correct Answer: B

Explanation:

Uniform expansion helps accurate temperature measurement.

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Question (21)

Steel is stronger than pure iron mainly because

Explanation:

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Question (22)

Which compound is commonly used in antacid tablets?

Explanation:

Link:

Question (23)

A jeweller mixes copper with gold to make ornaments stronger. This process forms

Explanation:

Link:

Question (24)

Which gas is used in balloons because it is lighter than air and non-flammable?

Explanation:

Link:

Question (25)

Which compound is used in baking powder to make cakes soft and fluffy?

Explanation:

Link:

Question (26)

Which of the following is a medicinal use of compounds?

Explanation:

Link:

Question (27)

A builder chooses stainless steel instead of iron for railings mainly because stainless steel

Explanation:

Link:

Question (28)

Which mixture helps plants grow better by improving soil texture and nutrients?

Explanation:

Link:

Question (29)

Which element is most commonly used in thermometers?

Explanation:

Link:

Question (30)

Which property makes mercury suitable for thermometers?

Explanation:

Link:

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