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________ is the most commonly used.

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________ is the most commonly used.

(a) Conglomerate

(b) Gneiss

(c) Marble

(d) Pumice

This 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

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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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