Building Materials
Based on the following rocks and minerals, select the correct statement, quartz, shale, basalt, granite, marble, gypsum, mica

Basalt and marble are the only metamorphic rocks
Granite is the only igneous rock
Quartz and mica are minerals
There is no sedimentary rock

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Building Materials
The basic purpose of a retarder in concrete is

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

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