If 90% of soil particles got retained over 2 mm sieve and 50% of soil particles got retained over 4.75 mm sieve, then the effective diameter of the soil will be:

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Question

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SSC JE Civil 06 Jun 2024 Shift 3 Official Paper - 1

Answer 1

Explanation:

The effective diameter of soil, often referred to as $D_{10}$ is the particle size at which 10% of the soil particles are finer by weight.
90% of the soil particles are retained on a 2 mm sieve.
50% of the soil particles are retained on a 4.75 mm sieve.
If 90% of the particles are retained on a 2 mm sieve, then 10% of the particles pass through the 2 mm sieve.
This means the effective diameter D10 corresponds to 2 mm, as it's the size below which 10% of the particles exist.
The effective diameter D10 of the soil will be 2 mm.