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Per §5.4.1, in the slump test the tamping rod diameter used to compact each layer is:
A{'text': '16 mm diameter', 'label': 'A'}
B{'text': '12 mm diameter', 'label': 'B'}
C{'text': '10 mm diameter', 'label': 'C'}
D{'text': '20 mm diameter', 'label': 'D'}
Answer & Solution
Correct answer: A. {'text': '16 mm diameter', 'label': 'A'}
1. §5.4.1: 'Each layer is tamped 25 times by the 16 mm diameter tamping rod uniformly.'
2. Both the layer count (4) and the strokes-per-layer (25) are the canonical values reproduced in IS code.
_Source: IGNOU ET-522 Block-2 Unit-5 Workability & Fresh Concrete-I, §5.4.1, p. 8_
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