Cement MCQ with answer and solution

Concept

Compressive Strength of Cement

Formula

No

Step-by-step solution

- Recall the standard mould size for testing cement compressive strength: 70.6 mm x 70.6 mm x 70.6 mm - Convert dimensions from mm to cm: 70.6 mm = 7.06 cm (approx. 7.05 cm) - Select Option A (7.05 cm cube)

Explanation

Option A is correct because the standard cube size specified for testing the compressive strength of cement mortar is 70.6 mm, which is equal to 7.06 cm (approximately 7.05 cm). A cube of this size provides a face surface area of roughly 50 cm², making the calculation for compressive strength simpler.

Shortcut

Remember 7 cm (70.6 mm) or that the face area is 50 cm² (7.07 × 7.07 ≈ 50).

Common mistake

Students often confuse the mould size used for testing cement mortar (7.06 cm / 7.05 cm cube) with the standard 15 cm cube used for testing concrete compressive strength.