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________________ is rarely used as a structural material at present construction works.(a) Steel(b) Cast iron(c) Aluminium(d) Asbestos cementThis question was addressed to me by my college professor while I was bunking the class.The query is from Fire Resisting Materials topic in section Fire Protection in Building, Carpentry and Joinery of Construction & Building Materials

Answer»

Correct answer is (b) CAST IRON

Best explanation: Cast iron files into pieces when heated and SUDDENLY COOLED. Hence, when this material is used in construction, it is covered either by BRICK work of one brick thickness or any other fire resisting material such as concrete.



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