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Select the incorrect statement from the following pertaining to design of a graded filter -

Question

Select the incorrect statement from the following pertaining to design of a graded filter -

To avoid segregation, filter should contain particles of size larger than 75 mm

For proper working, the filter material should not contain more than of fines passing 75 micron IS sieve

The material of the last layer should be coarse enough not be carried away through the openings of the perforated pipes.

None of these

Solution

Correct option is A

To avoid segregation, filter should contain particles of size larger than 75 mm. This statement is incorrect because in the context of designing a graded filter for applications such as drainage or erosion control, using particles larger than 75 mm to avoid segregation is not a standard guideline.