Geotechnical·MCQ practice Index Properties and Their Determination – Part 3
15 questions. Tap an option to check it instantly, then read the solution.
Question 1Easy
The water content where further loss of moisture will NOT result in any soil volume reduction is known as:
Answer: B. shrinkage limit
Shrinkage limit: the water content below which further moisture loss causes no further volume reduction.
Question 2Easy
The limit of water content at which soil tends to pass from semi-solid state to the solid state is called:
Answer: C. shrinkage limit
Shrinkage limit is the boundary between the solid and semi-solid states of soil.
Question 3Easy
The water content at which soil changes from a liquid state to a plastic state is known as:
Answer: C. liquid limit
Liquid limit: the water content at which soil changes from liquid to plastic state (shear strength ~2.7 kN/m2 for all soils at this point).
Question 4Medium
Toughness Index of a soil is the ratio of:
Answer: B. Plasticity Index to Flow Index
Toughness index It = Ip / If (plasticity index over flow index).
Question 5Easy
The ratio of plasticity index and flow index is known as:
Answer: B. Toughness index
The ratio of plasticity index to flow index is called the toughness index.
Question 6Easy
The diameter of the sieve used for finding liquid limit is:
Answer: D. 425 microns
The liquid limit test uses a soil sample passed through a 425-micron sieve.
Question 7Easy
Identify the consistency limit corresponding to the smallest water content at which the soil is still in liquid state.
Answer: C. Liquid limit
The smallest water content at which soil is still liquid is the liquid limit.
Question 8Medium
Which of the following represents the range of plasticity index for silt?
Answer: A. 10 to 15
Silt typically has a plasticity index in the 10-20 range; 10 to 15 is the closest given option.
Question 9Easy
Which of the following methods is used to find the specific gravity of soil in a laboratory?
Answer: A. Pycnometer method
Specific gravity of soil in the lab is found using the pycnometer method (not hydrometer analysis, which is for particle-size sedimentation).
Question 10Easy
Which of the soil possesses zero plasticity index?
Answer: C. Sand
Sand has zero plasticity index (non-plastic, coarse, cohesionless).
Question 11Easy
The liquid limit and plastic limit of the soil is given as 45% and 22% respectively. The plasticity index of the soil would be.............
Answer: B. 0.23
Ip = WL - WP = 45 - 22 = 23% = 0.23.
Question 12Easy
Casagrande's apparatus is used to determine:
Answer: A. liquid limit
Casagrande's apparatus determines the liquid limit; grooving tool per IS 2720-1985: bottom 2mm, top 11mm, depth 8mm.
Question 13Easy
Which of the following apparatus is used to measure the liquid limit of soil?
Answer: A. Casagrande apparatus
The Casagrande apparatus is used to measure the liquid limit.
Question 14Easy
The plasticity index and plastic limit of a soil is given by 25% and 20% respectively. What will be the liquid limit of the soil?
Answer: D. 0.45
WL = Ip + WP = 0.25 + 0.20 = 0.45.
Question 15Medium
The meniscus and dispersing agent corrections, in the hydrometer analysis, respectively are:
Answer: A. Positive and negative
Meniscus correction is positive; dispersing agent correction is negative, in hydrometer analysis.