If the fineness modulus of a sample of fine aggregate is 4.3, the mean size of the particles in the sample is between

150 μm and 300 μm
300 μm and 600 μm
1.18 mm and 2.36 mm
2.36 mm and 4.75 mm

Correct answer: 1.18 mm and 2.36 mm

Solution

A fineness modulus of 4.3 is relatively high for fine aggregate, indicating a coarse sand. The mean particle size therefore lies in the coarser fine-aggregate range, between 1.18 mm and 2.36 mm.

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