Building Materials
Which of the following represents a metamorphic rock?
(i) Slate
(ii) Shale
(iii) Quartzite

Both (i) and (iii)
Both (ii) and (iii)
All (i), (ii) and (iii)
Only (iii)

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Building Materials
Acrylic sheets

Possess the light transmission rate of 93%
Are generally unaffected by most household detergents
Possess 10 to 17 times greater breakage resistance than that of glass of equivalent thickness
All of these

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