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Question (1)

QN001001

Which non-metal is essential for respiration in living organisms?

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

Correct Answer: C

Explanation:

Oxygen is necessary for respiration.

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Question (2)

QN001002

Oxygen present in air is approximately:

(A) 10%
(B) 21%
(C) 50%
(D) 78%

Correct Answer: B

Explanation:

Air contains about 21% oxygen.

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Question (3)

QN001003

Which non-metal is known as the building block of life?

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

Correct Answer: C

Explanation:

Carbon is present in all living organisms.

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Question (4)

QN001004

Carbon is present in all:

(A) Metals
(B) Living organisms
(C) Minerals only
(D) Acids only

Correct Answer: B

Explanation:

All living organisms contain carbon compounds.

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Question (5)

QN001005

Which non-metal is used in the manufacture of fertilisers?

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

Correct Answer: A

Explanation:

Nitrogen is used in making fertilisers.

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Question (6)

QN001006

Nitrogen is important for plant growth because it helps in the formation of:

(A) Rust
(B) Proteins
(C) Glass
(D) Kerosene

Correct Answer: B

Explanation:

Nitrogen helps plants make proteins.

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Question (7)

QN001007

Which non-metal is commonly used to purify drinking water?

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

Correct Answer: C

Explanation:

Chlorine kills harmful germs in water.

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Question (8)

QN001008

Chlorine is added to water mainly to:

(A) Increase colour
(B) Remove germs
(C) Increase hardness
(D) Add fragrance

Correct Answer: B

Explanation:

Chlorine disinfects water.

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Question (9)

QN001009

A solution of iodine is commonly used as an:

(A) Fuel
(B) Fertiliser
(C) Antiseptic
(D) Lubricant

Correct Answer: C

Explanation:

Iodine solution is used as an antiseptic.

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Question (10)

QN001010

Which non-metal is applied on cuts and wounds to prevent infection?

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

Correct Answer: C

Explanation:

Iodine helps prevent infection in wounds.

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Question (1)

Which non-metal is essential for respiration in living organisms?

Explanation:

Link:

Question (2)

Oxygen present in air is approximately:

Explanation:

Link:

Question (3)

Which non-metal is known as the building block of life?

Explanation:

Link:

Question (4)

Carbon is present in all:

Explanation:

Link:

Question (5)

Which non-metal is used in the manufacture of fertilisers?

Explanation:

Link:

Question (6)

Nitrogen is important for plant growth because it helps in the formation of:

Explanation:

Link:

Question (7)

Which non-metal is commonly used to purify drinking water?

Explanation:

Link:

Question (8)

Chlorine is added to water mainly to:

Explanation:

Link:

Question (9)

A solution of iodine is commonly used as an:

Explanation:

Link:

Question (10)

Which non-metal is applied on cuts and wounds to prevent infection?

Explanation:

Link:

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