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Question
Match suitable method for determination of specific gravity (List - II) of different types of soils (List - I).
List - I                             List-II 
A. Coarse grained soils   1.Density bottle method 
B. Cohesive soils             2. Pycnometer method 
C. All types of soils 
Codes :  
          A    B    C
A.
1    1    2
B.
2    1    1
C.
2    1    2
D.
1    2    2
Answer ( Option B)

2    1    1

Solution

Specific gravity of the soil can be measured by
(a) 50 ml density bottle
(b) 500 ml flask
(c) Pycnometer
• Density bottle method is the most accurate amongst all and is suitable for all types of soil.
• Flask and Pycnometer is suitable to be used for coarse grained soil and if it is used for fine grained soil then kerosene is used instead of water as it is better wetting reagent than water.
• In Density bottle only kerosene is used

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