Default Title

Question (11)

QN0029803

The Iron Pillar of Delhi is famous because it:

(A) Is made of gold
(B) Has not rusted significantly for centuries
(C) Produces electricity
(D) Is coated with silver

Correct Answer: B

Explanation:

It reflects advanced ancient Indian metallurgy.

Link:

Report Error

Question (12)

QN0029804

Which process is used to protect iron from rusting by coating it with zinc?

(A) Alloying
(B) Corrosion
(C) Galvanisation
(D) Distillation

Correct Answer: C

Explanation:

Zinc coating prevents contact with moist air.

Link:

Report Error

Question (13)

QN0029805

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

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

Correct Answer: C

Explanation:

Chlorine kills harmful microorganisms.

Link:

Report Error

Question (14)

QN0029806

Which gas is released when sodium reacts with water?

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

Correct Answer: B

Explanation:

Sodium reacts vigorously with water releasing hydrogen gas.

Link:

Report Error

Question (15)

QN0029807

A student observes a substance that is dull, brittle, and non-sonorous. The substance is most likely a:

(A) Metal
(B) Alloy
(C) Non-metal
(D) Conductor

Correct Answer: C

Explanation:

These are common properties of non-metals.

Link:

Report Error

Question (16)

QN0029808

Which non-metal is used in matchsticks and catches fire easily in air?

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

Correct Answer: C

Explanation:

White phosphorus is highly reactive in air.

Link:

Report Error

Question (17)

QN0029809

Why is oil poured over boiled water in a rusting experiment?

(A) To increase rusting
(B) To add oxygen to water
(C) To prevent air from dissolving in water
(D) To cool the setup

Correct Answer: C

Explanation:

This removes contact between oxygen and water.

Link:

Report Error

Question (18)

QN0029810

Which of the following is an example of corrosion other than rusting?

(A) Melting of wax
(B) Green coating on copper
(C) Boiling of water
(D) Freezing of milk

Correct Answer: B

Explanation:

Copper develops a green layer due to corrosion.

Link:

Report Error

Question (19)

QN0029811

Carbon dioxide is used in fire extinguishers because it:

(A) Supports combustion
(B) Is highly inflammable
(C) Does not support combustion
(D) Produces oxygen

Correct Answer: C

Explanation:

Carbon dioxide helps control fire.

Link:

Report Error

Question (20)

QN0029812

Which conclusion best explains the importance of metals and non-metals in daily life?

(A) Only metals are useful in industries.
(B) Only non-metals are useful in living organisms.
(C) Both metals and non-metals are essential for human life and society.
(D) Metals and non-metals have no practical applications.

Correct Answer: C

Explanation:

They are used in industries, health, agriculture, transport, and daily activities.

Link:

Report Error

Question (11)

The Iron Pillar of Delhi is famous because it:

Explanation:

Link:

Question (12)

Which process is used to protect iron from rusting by coating it with zinc?

Explanation:

Link:

Question (13)

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

Explanation:

Link:

Question (14)

Which gas is released when sodium reacts with water?

Explanation:

Link:

Question (15)

A student observes a substance that is dull, brittle, and non-sonorous. The substance is most likely a:

Explanation:

Link:

Question (16)

Which non-metal is used in matchsticks and catches fire easily in air?

Explanation:

Link:

Question (17)

Why is oil poured over boiled water in a rusting experiment?

Explanation:

Link:

Question (18)

Which of the following is an example of corrosion other than rusting?

Explanation:

Link:

Question (19)

Carbon dioxide is used in fire extinguishers because it:

Explanation:

Link:

Question (20)

Which conclusion best explains the importance of metals and non-metals in daily life?

Explanation:

Link:

Excel With Tutors

ExcelWithTutors

For Student

For Tutors

Learn

OUR POLICY