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Question (11)

QN001011

Which non-metal is essential for combustion?

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

Correct Answer: C

Explanation:

Oxygen supports combustion.

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Question (12)

QN001012

Which gas forms the largest percentage of air?

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

Correct Answer: B

Explanation:

Nitrogen forms about 78% of air.

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Question (13)

QN001013

Nitrogen present in air is approximately:

(A) 21%
(B) 50%
(C) 78%
(D) 90%

Correct Answer: C

Explanation:

Nitrogen is the major component of air.

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Question (14)

QN001014

Which non-metal is used in soft drinks in the form of carbon dioxide gas?

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

Correct Answer: A

Explanation:

Carbon dioxide is used in aerated drinks.

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Question (15)

QN001015

Carbon dioxide is released during:

(A) Respiration
(B) Rusting only
(C) Freezing only
(D) Filtration only

Correct Answer: A

Explanation:

Respiration releases carbon dioxide.

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Question (16)

QN001016

Which of the following non-metals is essential for making proteins in plants?

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

Correct Answer: B

Explanation:

Nitrogen is needed for protein formation.

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Question (17)

QN001017

Which non-metal helps living organisms obtain energy from food?

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

Correct Answer: A

Explanation:

Oxygen is required for respiration.

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Question (18)

QN001018

Which non-metal is present in pencil lead in the form of graphite?

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

Correct Answer: B

Explanation:

Graphite is a form of carbon.

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Question (19)

QN001019

Graphite is an allotrope of:

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

Correct Answer: C

Explanation:

Graphite and diamond are allotropes of carbon.

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Question (20)

QN001020

Which property makes graphite useful in making electrodes?

(A) Brittleness
(B) Conductivity of electricity
(C) High reactivity
(D) Solubility in water

Correct Answer: B

Explanation:

Graphite conducts electricity.

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Question (11)

Which non-metal is essential for combustion?

Explanation:

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Question (12)

Which gas forms the largest percentage of air?

Explanation:

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Question (13)

Nitrogen present in air is approximately:

Explanation:

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Question (14)

Which non-metal is used in soft drinks in the form of carbon dioxide gas?

Explanation:

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Question (15)

Carbon dioxide is released during:

Explanation:

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Question (16)

Which of the following non-metals is essential for making proteins in plants?

Explanation:

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Question (17)

Which non-metal helps living organisms obtain energy from food?

Explanation:

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Question (18)

Which non-metal is present in pencil lead in the form of graphite?

Explanation:

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Question (19)

Graphite is an allotrope of:

Explanation:

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Question (20)

Which property makes graphite useful in making electrodes?

Explanation:

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