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Question (31)

QN002801

Which compound is used to make plaster casts for fractured bones?

(A) Plaster of Paris
(B) Sodium chloride
(C) Calcium oxide
(D) Copper sulfate

Correct Answer: A

Explanation:

Plaster of Paris hardens quickly around bones.

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Question (32)

QN002802

Which of the following is an example of an alloy used for coin making?

(A) Brass
(B) Oxygen
(C) Sulfur
(D) Carbon dioxide

Correct Answer: A

Explanation:

Brass is commonly used in coins.

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Question (33)

QN002803

Which gas is mainly responsible for fizzy soft drinks?

(A) Hydrogen
(B) Carbon dioxide
(C) Nitrogen
(D) Oxygen

Correct Answer: B

Explanation:

Carbon dioxide gives the fizz in soft drinks.

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Question (34)

QN002804

Which element is essential for making strong magnets?

(A) Iron
(B) Sulfur
(C) Bromine
(D) Oxygen

Correct Answer: A

Explanation:

Iron is widely used in magnets.

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Question (35)

QN002805

A student observes rust-resistant bicycles made from stainless steel. This shows that alloys are often used to

(A) decrease durability
(B) improve properties of metals
(C) convert metals into gases
(D) remove all impurities

Correct Answer: B

Explanation:

Alloys improve strength and corrosion resistance.

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Question (36)

QN002806

Which of the following mixtures is used in painting walls?

(A) Cement paint
(B) Distilled water
(C) Oxygen gas
(D) Mercury

Correct Answer: A

Explanation:

Cement paint is a mixture used for wall coating.

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Question (37)

QN002807

Which compound is commonly added to toothpaste to prevent tooth decay?

(A) Sodium chloride
(B) Calcium carbonate
(C) Fluoride compounds
(D) Iron oxide

Correct Answer: C

Explanation:

Fluoride compounds strengthen tooth enamel.

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Question (38)

QN002808

A pressure cooker is usually made of aluminium because aluminium

(A) conducts heat efficiently
(B) is non-metallic
(C) breaks easily
(D) reacts strongly with water

Correct Answer: A

Explanation:

Aluminium transfers heat quickly.

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Question (39)

QN002809

Which material is most suitable for electric fuse wires because of its low melting point?

(A) Copper
(B) Tungsten alloy
(C) Lead-tin alloy
(D) Iron

Correct Answer: C

Explanation:

Lead-tin alloy melts quickly to break the circuit.

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Question (40)

QN002810

Which of the following best explains why mixtures, compounds, and elements are important in society?

(A) They are used only in laboratories
(B) They have no role in technology
(C) They are essential in industry, medicine, construction, and daily life
(D) They can always be separated physically

Correct Answer: C

Explanation:

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Question (31)

Which compound is used to make plaster casts for fractured bones?

Explanation:

Link:

Question (32)

Which of the following is an example of an alloy used for coin making?

Explanation:

Link:

Question (33)

Which gas is mainly responsible for fizzy soft drinks?

Explanation:

Link:

Question (34)

Which element is essential for making strong magnets?

Explanation:

Link:

Question (35)

A student observes rust-resistant bicycles made from stainless steel. This shows that alloys are often used to

Explanation:

Link:

Question (36)

Which of the following mixtures is used in painting walls?

Explanation:

Link:

Question (37)

Which compound is commonly added to toothpaste to prevent tooth decay?

Explanation:

Link:

Question (38)

A pressure cooker is usually made of aluminium because aluminium

Explanation:

Link:

Question (39)

Which material is most suitable for electric fuse wires because of its low melting point?

Explanation:

Link:

Question (40)

Which of the following best explains why mixtures, compounds, and elements are important in society?

Explanation:

Link:

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