i) Rock blasting and extraction of various types of stones from natural rock is an industry that has very much close association with the construction industry. The process ranges from producing materials such as quarry dust to luxury products. Some are used in raw state and some are transformed to a different state through chemical or other processes.


a) Name two (02) types of such materials and write down two (02) examples for each of them;

b) Write down the places of using each type.


ii) Explain the purpose of using “Sealant” in construction. What are the main properties of sealants? Name two (02) sealant materials and the places of their respective application.

iii) Name three (03) types of defects occurred in a newly painted metallic surface.

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