Strength properties of hand-moulded bricks — identify the correct set of average values. Choose the most accurate option.

Introduction / Context:
Brick quality is often summarized by compressive (crushing), tensile, and shear strengths. While compressive strength is the principal criterion, awareness of typical ranges for other strengths helps in design checks and material selection. This question tests recognition of commonly cited average values for hand-moulded bricks in older unit systems.

Given Data / Assumptions:

• Units are given in t/m² (tonnes per square metre).
• Values asked are “average,” not characteristic minima for high-grade classes.
• Hand-moulded, fired clay bricks of standard quality.

Concept / Approach:
Compressive strength of conventional bricks far exceeds their tensile and shear strengths. The listed values represent typical magnitudes referenced in traditional texts, acknowledging variability with raw material, firing, and porosity.

Step-by-Step Solution:

Verification / Alternative check:
Cross-check with standard building materials references that present approximate values and stress the dominance of compressive over tensile capacity in masonry units.

Why Other Options Are Wrong:
Each single value captures only part of the picture; the comprehensive and correct set is “All of the above.”

Common Pitfalls:
Comparing these legacy units directly with modern N/mm² without conversion; ignoring wide variability across classes and manufacturing quality.

Final Answer:
All of the above