Q.1 A fine grained soil is found to be plastic in the water content range of 26-48%. As per Indian Standard Classification System, the soil is classified as [2016 : 1 Mark, Set-I]
Soil is plastic in the range of 26-48%.
Hence plastic limit = 26% and liquid limit = 48%. Because liquid limit is in the range of 35% to 50%. Hence intermediate compressible soil.
Q.2 The clay mineral primarily governing the swelling behavior of Black Cotton soil is [2014 : 1 Mark, Set-II]
Q.3 As per Indian Standard Soil Classification System (IS 1498 : 1970), an expression for A-line is [2014 : 1 Mark, Set-II]
Q.4 As per the Indian Standard soil classification system, a sample of silty clay with liquid limit of 40% and plasticity index of 28% is classified as [2012 : 1 Mark]
Q.5 The results for sieve analysis carried out for three types of sand, P, Q and R, are given in the adjoining figure. If the fineness modulus values of the three sands are given as FMP, FMQ and FMR, it can be stated that [2011 : 1 Mark]
The term fineness modulus is used to indicate an index number which roughly proportional to average size of particle in entire quantity of aggregate.
Q.6 A fine grained soil has liquid limit of 60 and plastic limit of 20. As per the plasticity chart, according to IS classification, the soil is represented by the letter symbols [2010 : 1 Mark]
Equation of A line is given by,
Thus the given soil lies above the A-Line. The liquid limit of the soil is more than 50, hence the soil will be CH.