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Question
In hydrometer analysis for a soil mass
e`nk ds gkbMªksehVj fo'ys"k.k esa gksrk gSA
A.
Both meniscus correction and dispersing agent correction are additive
B.
Both meniscus correction and dispersing agent correction are subtractive
C.
Meniscus correction is additive and dispersing agent correction is subtractive
D.
Meniscus correction is subtractive and dispersing agent correction is additive
Answer ( Option C)

Meniscus correction is additive and dispersing agent correction is subtractive

Solution

The grain size distribution of fine soil is determined using sedimentation analysis. Sedimentation analysis is performed using two methods:
(1) Pipette method
(2) Hydrometer method. 
A hydrometer is a device used to measure the specific gravity of liquids. 
The following three corrections are necessary for:
1. Meniscus correction: Since the hydrometer readings increase downward on the stem, the meniscus correction (Cm) is always positive.
2. Temperature correction: If the temperature at the time of the test is more than that of calibration of the hydrometer, the observed reading will be less and the correction (Ct) would be positive and vice versa.
3. Deflocculating agent correction: The addition of the deflocculating agent increases the density of the suspension and thus a correction (Cd) is applied which is always negative.

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