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

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

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Building Materials
Acrylic sheets

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

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