Question

The minimum settlement that is to be observed for ending the plate load test is

Answer 1

25 mm

Plate load test is a field test, that is performed to decide a definitive bearing limit of soil and the likely settlement under a given load. This test is mainstream for selection and plan of shallow establishment.  

For this test, the plate is put at the ideal profundity / depth, at that point the load is connected bit by bit and the settlement for every augmentation of load is recorded. At a certain point, a settlement happens at a quick rate, the total load up to that point is determined and partitioned by the territory of the plate to decide a definitive bearing limit of soil at that profundity.