Pick up the incorrect statement from the following:
Try it first: pick an option, then read the explanation.
Correct answer: D. The mould is in the form of a frustum of hexagonal pyramid
Detailed Explanation: Slump Mould Shape
Why D is INCORRECT: The slump mould is a frustum of a right circular cone — meaning it is a truncated cone with circular (not hexagonal) cross-sections at top and bottom. A hexagonal pyramid would have six flat triangular faces meeting at an apex — completely different from the smooth, circular, tapered cone used in practice. This is a simple factual question about the geometry of standard test equipment per IS 1199.Checking Each Statement
| Statement | Correct? |
|---|---|
| A. Top and bottom ends are parallel | TRUE — both horizontal circular planes |
| B. Axis perpendicular to end faces | TRUE — vertical axis, horizontal faces |
| C. Internal surface clean (no set cement) | TRUE — standard test preparation requirement |
| D. Frustum of hexagonal pyramid | FALSE — it is a circular cone frustum |
- Slump mould = frustum of a right circular cone.
- Frustum = a cone with the top cut off by a plane parallel to the base.