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Question (21)

QN00861

Materials that allow electricity to flow through them easily are called:

(A) Poor conductors
(B) Insulators
(C) Conductors
(D) Semiconductors

Correct Answer: C

Explanation:

Conductors allow electric current to pass through them.

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Question (22)

QN00862

An electrician wears rubber gloves while working because rubber is:

(A) A good conductor
(B) A metal
(C) A poor conductor of electricity
(D) Sonorous

Correct Answer: C

Explanation:

Rubber prevents electric shock as it is an insulator.

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Question (23)

QN00863

Which combination contains only good conductors of electricity?

(A) Aluminium, copper, iron
(B) Wood, rubber, coal
(C) Sulfur, stone, nylon
(D) Coal, wood, rubber

Correct Answer: A

Explanation:

Metals are generally good conductors of electricity.

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Question (24)

QN00864

Brown deposits on iron objects are called:

(A) Oxides
(B) Rust
(C) Ash
(D) Soot

Correct Answer: B

Explanation:

Rust is the brown deposit formed on iron.

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Question (25)

QN00865

Rusting of iron takes place when iron comes in contact with:

(A) Dry air only
(B) Water only
(C) Both air and water
(D) Sunlight only

Correct Answer: C

Explanation:

Moist air causes rusting of iron.

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Question (26)

QN00866

In the rusting experiment, the iron nail in bottle A did not rust because:

(A) Air was absent
(B) Water was absent
(C) Both air and water were absent
(D) Iron was coated with oil

Correct Answer: B

Explanation:

Rusting needs both air and water.

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Question (27)

QN00867

In the rusting experiment, boiled water was used in bottle B mainly to:

(A) Increase rusting
(B) Remove dissolved gases
(C) Change water colour
(D) Cool the iron nail

Correct Answer: B

Explanation:

Boiling removes dissolved gases like oxygen.

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Question (28)

QN00868

Which method can help prevent rusting of iron?

(A) Breaking the iron
(B) Adding sulfur
(C) Painting the surface
(D) Heating continuously

Correct Answer: C

Explanation:

Painting prevents contact with air and moisture.

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Question (29)

QN00869

Applying a protective zinc coating on iron is called:

(A) Alloying
(B) Rusting
(C) Galvanisation
(D) Smelting

Correct Answer: C

Explanation:

Zinc coating protects iron from rusting.

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Question (30)

QN00870

The Iron Pillar of Delhi is famous because it:

(A) Is made of gold
(B) Produces electricity
(C) Resists rusting remarkably well
(D) Is made of wood and iron

Correct Answer: C

Explanation:

The Iron Pillar shows ancient Indian metallurgy skills.

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Question (21)

Materials that allow electricity to flow through them easily are called:

Explanation:

Link:

Question (22)

An electrician wears rubber gloves while working because rubber is:

Explanation:

Link:

Question (23)

Which combination contains only good conductors of electricity?

Explanation:

Link:

Question (24)

Brown deposits on iron objects are called:

Explanation:

Link:

Question (25)

Rusting of iron takes place when iron comes in contact with:

Explanation:

Link:

Question (26)

In the rusting experiment, the iron nail in bottle A did not rust because:

Explanation:

Link:

Question (27)

In the rusting experiment, boiled water was used in bottle B mainly to:

Explanation:

Link:

Question (28)

Which method can help prevent rusting of iron?

Explanation:

Link:

Question (29)

Applying a protective zinc coating on iron is called:

Explanation:

Link:

Question (30)

The Iron Pillar of Delhi is famous because it:

Explanation:

Link:

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