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Question
Consider the following statements :
1. All soils can be identified in the field by visual examination.
2. Fine-grained soils can be identified in the field by visual examination and touch.
3. Fine grained soils can be identified in the field by dilatancy test.
4. By visual examination, only coarse-grained soils can be identified.
Which of the above statements are correct?
A.
1 and 2 only
B.
2 and 3 only
C.
3 and 4 only
D.
1 and 4 only
Answer ( Option C)

3 and 4 only

Solution

Visual examination should establish the colour, grain size, grain shapes of the coarse grained part of soil.
Dilatancy test is one of the test used in field to identify fine grained soil. In this test, a wet part of soil is taken and shaken vigorously in the palm. Silt exhibits quick response and water appears on surface, whereas clay shows no or slow response.

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