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The boundary size that separates COARSE from FINE aggregate, as fixed in the source, is:
A{'text': '4.75 mm', 'label': 'A'}
B{'text': '150 micron (0.150 mm)', 'label': 'B'}
C{'text': '2.36 mm', 'label': 'C'}
D{'text': '75 micron (0.075 mm)', 'label': 'D'}
Answer & Solution
Correct answer: A. {'text': '4.75 mm', 'label': 'A'}
1. §2.2.3: 'Coarse Aggregate - size greater than 4.75 mm. Fine Aggregate - size less than 4.75 mm.'
2. Table 2.6 then reinforces the boundary by placing 4.75 mm at the bottom of the coarse aggregate column and the top of the fine aggregate column.
_Source: IGNOU ET-522 Block-1 Unit-2 Aggregates, §2.2.3 and Table 2.6, pp. 20 and 27_
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