Building Materials
The internal size of mould used in brick preparation is

Smaller than the size of a fully burnt brick
None of these
Greater than the size of a fully burnt brick
Equal to the size of a fully burnt brick

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Building Materials
The basic purpose of a retarder in concrete is

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

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