GATE 2023 AR — Architecture – Question 55

Building Construction, Materials, and Structural Systems · Building materials characteristics & applications · 1 mark · Multiple select

Which statements about clay-brick constituents are NOT correct?

Lime below 10%, in finely divided carbonate form, lowers the fusion temperature.
Magnesia above 1% imparts a red colour.
Iron pyrites oxidise during burning.
Excess alkalis decrease efflorescence.

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Show answer and explanation

Correct answer: (B) Magnesia above 1% imparts a red colour.; (D) Excess alkalis decrease efflorescence.

Explanation

Magnesia is associated with yellowish tones, whereas iron oxides give red coloration, making B incorrect. Excess soluble alkalis encourage efflorescence rather than suppressing it, making D incorrect. The item asks for the wrong statements, so select B, D rather than the chemically plausible statements A, C.

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