Building Materials
Higher pitch of the roofi) results in stronger roofii) results in weaker roofiii) requires more covering materialiv) requires less covering materialThe correct answer is

(ii) and (iii)
(ii) and (iv)
(i) and (iv)
(i) and (iii)

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Building Materials
The basic purpose of a retarder in concrete is

To increase the initial setting time of cement paste in concrete
To improve the workability of concrete mix
To render the concrete more water tight
To decrease the initial setting time of cement paste in concrete

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Building Materials
Cast iron

May contain 2 to 5 per cent of carbon with other impurities
All listed here
Is manufactured in required shapes
Is obtained by purifying pig iron

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