Discussion
A mortar cube of 50 mm side fails at a load of 100 kN. Its compressive strength is
Answer: C
Correct answer: 40 N/mm\( ^2 \)
The area of a 50 mm cube face is \( 50 \times 50 = 2500 \) mm², so \[ f = \frac{100 \times 10^3}{2500} = 40\ \mathrm{N/mm^2}. \] The commonest error is to forget the conversion of kilonewtons to newtons, which gives an answer a thousand times too small.
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