Building Materials
Age of a tree may be ascertained by

Number of annual rings
Circumference of its stem
Number of branches
Radius of its stem

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Building Materials
The basic purpose of a retarder in concrete is

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
To improve the workability of concrete mix

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Building Materials
Rapid hardening cement attains early strength due to

Lesser proportion of lime grounded coarser than normal cement
Excess percentage of gypsum
Lesser proportion of lime grounded finer than normal cement
Larger proportion of lime grounded finer than normal cement

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