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_________ apparatus is used to test liquid limit of a soil.

(a) Mohr

(b) Casagrande

(c) Otto

(d) Terzaghi

The question was asked in my homework.

The above asked question is from Soil Properties in section Other Major Topics in Civil Engineering of Basic Civil Engineering

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Correct answer is (b) Casagrande

The explanation: The water content at which soil changes from liquid to plastic state is liquid limit. Casagrande apparatus consists of a rubber base and brass cup.  Sample is filled in a cup, subjected to blows by rotating handle at 2 revolutions per second. Water content corresponding to 25 blows is the liquid limit.

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