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

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

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Building Materials
Putty is

All listed here
Used for fixing glass panes
Made with finely powdered chalk and linseed oil
Softened by a solution of pearl ash and quick-lime soaked in water

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