Which of the following statement(s) is / are incorrect regarding 'Direct shear test'?
1. The sample fails along the weakest plane
2. Test is conducted in a controlled drainage conditions
3. The test is quick, inexpensive and suitable for sands
A
1 and 3
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B
3 only
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C
2 only
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D
1 and 2
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Solution
The correct option is D 1 and 2
In direct shear test, the failure plane is horizontal which may not be the weakest plane.
Drainage conditions can't be controlled in direct shear test,