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The cone which is used to penetrate the soil pat has a central angle of ___________

(a) 26 degree

(b) 30 degree

(c) 31 degree

(d) 40 degree

The question was posed to me in an international level competition.

This question is from Determination of Liquid and Plastic Limit topic in portion Index Properties Determination of Geotechnical Engineering I

1 Answer

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Best answer
Correct choice is (c) 31 degree

Easiest explanation: The cone has a central angle of 31° since the total sliding mass is 80 g.

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