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Question (31)

QN00911

Which statement best explains why iron bridges are painted regularly?

(A) To make them heavier
(B) To prevent rusting
(C) To improve electrical conductivity
(D) To reduce temperature

Correct Answer: B

Explanation:

Paint acts as a protective layer.

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Question (32)

QN00912

Which material was used in the activity to absorb moisture from air?

(A) Oil
(B) Water
(C) Silica gel
(D) Sandpaper

Correct Answer: C

Explanation:

Silica gel absorbs moisture from air.

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Question (33)

QN00913

Before starting the rusting experiment, old iron nails were scrubbed with sandpaper to:

(A) Increase rusting speed
(B) Remove existing rust deposits
(C) Change nail colour
(D) Make the nails lighter

Correct Answer: B

Explanation:

Existing rust must be removed for accurate observation.

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Question (34)

QN00914

Rust is most likely to form on which object?

(A) Iron nail kept in dry rice
(B) Iron rod exposed to rain
(C) Iron nail coated with grease
(D) Iron tool painted completely

Correct Answer: B

Explanation:

Rain provides moisture needed for rusting.

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Question (35)

QN00915

Which factor is common in all methods used to prevent rusting?

(A) Increasing temperature
(B) Preventing exposure to moist air
(C) Adding more iron
(D) Removing oxygen completely from surroundings

Correct Answer: B

Explanation:

Rust prevention methods block air and moisture.

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Question (36)

QN00916

The Iron Pillar of Delhi is famous because it:

(A) Is made of copper
(B) Produces magnetic force
(C) Has resisted rusting for centuries
(D) Contains silver coating

Correct Answer: C

Explanation:

The pillar shows excellent resistance to rusting.

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Question (37)

QN00917

The Iron Pillar of Delhi was made during the time of:

(A) Ashoka
(B) Chandragupta II
(C) Akbar
(D) Harshavardhana

Correct Answer: B

Explanation:

The Iron Pillar dates back to Chandragupta II’s time.

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Question (38)

QN00918

Approximately how tall is the Iron Pillar of Delhi?

(A) 2 metres
(B) 5 metres
(C) 8 metres
(D) 15 metres

Correct Answer: C

Explanation:

The Iron Pillar is about 8 metres high.

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Question (39)

QN00919

The Iron Pillar of Delhi weighs more than:

(A) 600 kilograms
(B) 1600 kilograms
(C) 3000 kilograms
(D) 6000 kilograms

Correct Answer: D

Explanation:

The Iron Pillar weighs more than 6000 kilograms.

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Question (40)

QN00920

The rust-resistant nature of the Iron Pillar of Delhi reflects the advanced skills of ancient India in:

(A) Pottery
(B) Agriculture
(C) Metallurgy
(D) Weaving

Correct Answer: C

Explanation:

Metallurgy is the science of working with metals.

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Question (31)

Which statement best explains why iron bridges are painted regularly?

Explanation:

Link:

Question (32)

Which material was used in the activity to absorb moisture from air?

Explanation:

Link:

Question (33)

Before starting the rusting experiment, old iron nails were scrubbed with sandpaper to:

Explanation:

Link:

Question (34)

Rust is most likely to form on which object?

Explanation:

Link:

Question (35)

Which factor is common in all methods used to prevent rusting?

Explanation:

Link:

Question (36)

The Iron Pillar of Delhi is famous because it:

Explanation:

Link:

Question (37)

The Iron Pillar of Delhi was made during the time of:

Explanation:

Link:

Question (38)

Approximately how tall is the Iron Pillar of Delhi?

Explanation:

Link:

Question (39)

The Iron Pillar of Delhi weighs more than:

Explanation:

Link:

Question (40)

The rust-resistant nature of the Iron Pillar of Delhi reflects the advanced skills of ancient India in:

Explanation:

Link:

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