Soil Mechanics And Foundation - Study Mode
[#41] The clay mineral with the largest swelling and shrinkage characteristics is
Correct Answer
(C) montmorillonite
[#42] If the material of the base of the Casagrande liquid limit device on which the cup containing soil paste drops is softer than the standard hard rubber, then
Correct Answer
(A) The liquid limit of soil always increases
[#43] According to Atterberg, the soil is said to be of medium plasticity if the plasticity index PI is
Correct Answer
(B) 7< PI < 17
Explanation
Solution: According to Atterberg, the soil is said to be of medium plasticity if the plasticity index (PI) is 7 < PI < 17 . The plasticity index (PI) is a measure of the plasticity of a soil and is calculated as the difference between the liquid limit (LL) and the plastic limit (PL). Soils with a PI between 7 and 17 are considered to have medium plasticity. This range indicates moderate changes in consistency with changes in moisture content. Therefore, the correct option is 7 < PI < 17 .
[#44] Which of the following is a measure of particle size range ?
Correct Answer
(B) uniformity coefficient
[#45] Sand particles are made of
Correct Answer
(A) rock minerals
Explanation
Solution: Sand particles are made of rock minerals. Sand primarily consists of small fragments of weathered rock and minerals, predominantly quartz, which is a durable and resistant mineral. Kaolinite, illite, and montmorillonite are types of clay minerals, which are much finer in particle size compared to sand and have different properties and compositions. Therefore, the correct answer is that sand particles are composed of rock minerals.