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Aluminium roof sheeting consists of aluminium alloyed with ________

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Aluminium roof sheeting consists of aluminium alloyed with ________

(a) Silica

(b) Carbon

(c) Magnesium

(d) Manganese

I have been asked this question in an interview.

My question is from Roof Coverings for Pitched Roofs in division Roofing Materials of Construction & Building Materials

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Correct answer is (d) Manganese

The explanation is: Aluminium roof sheeting is the lightest of all the roofing materials. It consists of aluminium alloyed with manganese. Manganese is present in a very small amount to impart strength.

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