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Per the source, the average specific gravity of rocks used as concrete aggregates typically lies in the range:
A{'text': '2.6 to 2.8', 'label': 'A'}
B{'text': '2.2 to 2.4', 'label': 'B'}
C{'text': '1.4 to 1.8', 'label': 'C'}
D{'text': '3.5 to 4.0', 'label': 'D'}
Answer & Solution
Correct answer: A. {'text': '2.6 to 2.8', 'label': 'A'}
1. §2.2.7 reads: 'Average specific gravity of rocks, normally, varies from 2.6 to 2.8.'
2. Specific gravity feeds into mix design (percent voids, compacting factor) — see §2.2.7 and §2.3.1(v).
_Source: IGNOU ET-522 Block-1 Unit-2 Aggregates, §2.2.7, p. 21_
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