Geotechnical Engineering

Hydrometer Method

Question 1
Marks : +2 | -2
Pass Ratio : 100%
The dispersing agent correction in hydrometer reading is always__________
Positive
Both negative and positive
Negative
Equal
Explanation:
The addition of dispersing agent in water increases its water level, therefore the dispersing correction is always negative.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
The hydrometer method differs from pipette method on the basis of which of the following?
Principle of test
Taking the observation
Method of procedure
None of the mentioned
Explanation:
In sedimentation analysis the hydrometer method differs from the pipette method in the method of taking the observation.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
The visibility of the soil suspension in hydrometer method is __________
Transparent
Translucent
Opaque
None of the mentioned
Explanation:
Since the density of the soil suspension is high, the visibility will be opaque.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
In hydrometer method, the sampling depth h is kept at a constant of __________
14 cm
9 cm
8 cm
10 cm
Explanation:
The sampling depth (h) in hydrometer method is taken as 10 cm.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
The corrected hydrometer reading for meniscus is _________
R=Rh’ + Cm
R=Rh’ + C
R=Rh’+ Cm ± CL – Cd
None of the mentioned
Explanation:
The three corrections Cm, CL, Cd can be combined into one corrections Cm and the equation can be written as R = Rh’ + Cm.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
The volume of suspension taken in the hydrometer test is __________
500
120
100
1000
Explanation:
The quantity of dry soil and dispersing agent is taken as double of pipette which is 500 ml.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
In calibration of hydrometer reading, the reduced reading are designated as __________
RS
RH
RR
RL
Explanation:
The reducing reading is designated as RH, which is used for calibration of hydrometer.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
The corrections which are applied to the hydrometer reading, in hydrometer method is _______
Meniscus correctionc and Dispersing agent correction
Magnitude correction
All of the mentioned
None of the mentioned
Explanation:
Both meniscus and dispersing agent correction are applied to a hydrometer reading.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
Which of the following is the correct hydrometer reading equation?
R = Rh’ + Cm ± CL – Cd
R = Rh’ + cm + CL – Cd
R = Cm ± Rm – Cd + CL
R = Rh + Cm ± Cd + CL
Explanation:
According to the derived equation of hydrometer the equation is
Question 10
Marks : +2 | -2
Pass Ratio : 100%
The meniscus correction in hydrometer reading is ___________
Always positive
Always negative
Negative sometime
Positive sometime
Explanation:
The actual reading to be taken at water level will be more; hence the meniscus correction will be always positive.