1.

________ is the most commonly used.(a) Conglomerate(b) Gneiss(c) Marble(d) PumiceThis question was addressed to me in an online interview.My question is taken from Light Weight Concrete in section Special Concrete and Concreting Methods of Concrete Technology

Answer»

Right OPTION is (d) Pumice

Explanation: Pumice is the most COMMONLY used and is actually a GLASS that forms when FROTHY volcanic ERUPTIONS cool quickly into rock.



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