1. By USCS system, soil are classified in to ___________ Major groups.
a) 2
b) 5
c) 6
d) 4
Explanation: Various soil are classified into four major groups
i. Coarse grained
ii. Fine grained
iii. Organic soils
iv. Peat.
2. A soil is considered as coarse grained, if it retains more than ___________ in a sieve.
a) 90% of the soil
b) 70% of the soil
c) 50% of the soil
d) 20% of the soil
Explanation: If more than 50 % of the soil is retained on a NO.200 US sieve (0.075), it is designated as coarse grained soil.
3. Coarse grained soils, containing fines between 5-12%, are designated by ___________ Symbol.
a) GW-GM and SP-SM
b) CL-ML
c) None of the mentioned
d) All of the mentioned
Explanation: If the percentage of fines lies between 5 to 12 %, coarse grained soils are designated by dual symbols GW-GM or SP-SM.
4. Fine grained soil are sub divided in to ___________
a) Silt and clay
b) Sand and clay
c) Organic and silt
d) Gravel and peat
Explanation: Based on their liquid limit and plasticity index, fine grained soils are subdivided in to silt and clay.
5. Fine grained soil are subdivided based on ___________
a) Liquid limit and Plasticity index
b) Group Index
c) None of the mentioned
d) All of the mentioned
Explanation: Based on the liquid limit and plasticity index, fine grained soil is subdivided.
6. Coarse grained soil is sub-divided in to _______________
a) Gravel and clay
b) Gravel and sand
c) Sand and silt
d) Silt and clay
Explanation: Based on the soil size, coarse grained soil is divided in to gravel and sand
7. In Casagrande’s plasticity chart, the numbers in the chart denotes ____________
a) Relative suitability
b) Grade of the soil
c) Division of the group
d) None of the mentioned
Explanation: In Casagrande’s plasticity chart, the numbers denote relative suitability with No.1 as the best and No.10 as the worst.
8. The Indian standard soil classification system, (ISCS) was first developed in ___________
a) 1947
b) 1950
c) 1959
d) 1960
Explanation: The Indian standard classification system (ISCS) was first developed in 1959 and revised in 1970.
9. According to ISCS, fine grained soils are subdivided in to ___________
a) 2
b) 4
c) 5
d) 3
Explanation: Fine grained soil are subdivided into 3 types
i. Inorganic silts and very fine sands
ii. Inorganic clays
iii. Organic silts and clay and organic matter.
10. The ISCS classifies the soil in to __________
a) 12 groups
b) 15 groups
c) 18 groups
d) 16 groups
Explanation: The ISCS classifies the soil into 18 groups as against 15 groups of USCS.