C3S and C2S together typically constitute the cement strength because their share of total cement is:
A{'text': 'About 20 to 30 percent', 'label': 'A'}
B{'text': 'About 70 to 80 percent', 'label': 'B'}
C{'text': 'About 40 to 50 percent', 'label': 'C'}
D{'text': 'About 90 to 95 percent', 'label': 'D'}
Answer & Solution
Correct answer: B. {'text': 'About 70 to 80 percent', 'label': 'B'}
1. §1.4 (after Table 1.3) reads: 'C3S and C2S are the most important compounds responsible for strength. Together, they constitute 70 to 80 percent of cement.'
2. The other ranges are not supported by the source.
_Source: IGNOU ET-522 Block-1 Unit-1 Cement, §1.4 (after Table 1.3), p. 7_
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