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Question (21)

QN001021

Diamond is another allotrope of:

(A) Nitrogen
(B) Sulfur
(C) Carbon
(D) Chlorine

Correct Answer: C

Explanation:

Diamond is a pure form of carbon.

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Question (22)

QN001022

Diamond is widely used in jewellery because it is:

(A) Soft and dull
(B) Hard and lustrous
(C) Soluble in water
(D) A good conductor

Correct Answer: B

Explanation:

Diamond is hard and shiny.

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Question (23)

QN001023

Which non-metal is necessary for the survival of aquatic animals?

(A) Oxygen dissolved in water
(B) Nitrogen dissolved in water
(C) Carbon particles
(D) Chlorine gas

Correct Answer: A

Explanation:

Aquatic animals use dissolved oxygen.

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Question (24)

QN001024

Which non-metal is commonly used in matchsticks?

(A) Phosphorus
(B) Nitrogen
(C) Oxygen
(D) Chlorine

Correct Answer: A

Explanation:

Phosphorus is used in matchsticks.

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Question (25)

QN001025

Which non-metal is essential for photosynthesis in plants in the form of carbon dioxide?

(A) Oxygen
(B) Carbon
(C) Nitrogen
(D) Sulfur

Correct Answer: B

Explanation:

Carbon dioxide is used in photosynthesis.

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Question (26)

QN001026

The gas responsible for supporting burning is:

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

Correct Answer: B

Explanation:

Oxygen supports burning.

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Question (27)

QN001027

Which non-metal is used in making fireworks due to its burning property?

(A) Sulfur
(B) Carbon
(C) Nitrogen
(D) Oxygen

Correct Answer: A

Explanation:

Sulfur is used in fireworks.

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Question (28)

QN001028

Which non-metal is used in vulcanisation of rubber?

(A) Nitrogen
(B) Sulfur
(C) Oxygen
(D) Chlorine

Correct Answer: B

Explanation:

Sulfur is used to harden rubber.

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Question (29)

QN001029

Which non-metal is added to toothpaste to prevent tooth decay?

(A) Carbon
(B) Sulfur
(C) Fluorine compounds
(D) Nitrogen

Correct Answer: C

Explanation:

Fluoride compounds help prevent tooth decay.

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Question (30)

QN001030

Which of the following non-metals is important in disinfecting swimming pool water?

(A) Oxygen
(B) Nitrogen
(C) Chlorine
(D) Carbon

Correct Answer: C

Explanation:

Chlorine is used for water disinfection.

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Question (21)

Diamond is another allotrope of:

Explanation:

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Question (22)

Diamond is widely used in jewellery because it is:

Explanation:

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Question (23)

Which non-metal is necessary for the survival of aquatic animals?

Explanation:

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Question (24)

Which non-metal is commonly used in matchsticks?

Explanation:

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Question (25)

Which non-metal is essential for photosynthesis in plants in the form of carbon dioxide?

Explanation:

Link:

Question (26)

The gas responsible for supporting burning is:

Explanation:

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Question (27)

Which non-metal is used in making fireworks due to its burning property?

Explanation:

Link:

Question (28)

Which non-metal is used in vulcanisation of rubber?

Explanation:

Link:

Question (29)

Which non-metal is added to toothpaste to prevent tooth decay?

Explanation:

Link:

Question (30)

Which of the following non-metals is important in disinfecting swimming pool water?

Explanation:

Link:

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