1. Which of the following terms are used to indicate grain sizes?
a) Gravel
b) Sand
c) Silt
d) All of the mentioned
Explanation: Terms such as gravel, sand, silt, and clay are used to indicate grain sizes. These terms are used only as a designation of particle size.
2. The term ‘silt’ in particle size classification system, can be replaced by ___________
a) Silt size
b) Clay size
c) Silt type
d) None of the mentioned
Explanation: As the system is classified based on size, it is preferable to use the word ‘silt size’ and ‘clay size’ in place of simply ‘silt’ or ‘clay’.
3. Indian standard classification of soil is based on _________
a) PRA system
b) International soil classification
c) M.I.T system
d) Indian system
Explanation: Indian standard classification (IS: 1948-1970) is based on the M.I.T. system.
4. Soil occurring in nature, is composed of __________
a) Sand
b) Decomposed substance
c) All of the mentioned
d) None of the mentioned
Explanation: Soil occurring in nature is composed of a different percentage of sand, silt, and clay size particles.
5. The purpose of soil classification is to ___________
a) To arrange various soils types in to groups
b) To use it for various purpose
c) For finding its properties
d) For investigating the soil
Explanation: The purpose of soil classification is to arrange various types of soils in to groups according to their engineering or agricultural properties.
6. Particle size classification is best suited for _________
a) Coarse grained soil
b) Clay soil
c) Dry soil
d) All of the mentioned
Explanation: Since properties of clay soils is less dependent on particle size distrubution(textural classification) and more dependent on size it is best suited for clay soil.
7. Particle size classification system does not signify __________
a) Soil types
b) Soil Particle size
c) All of the mentioned
d) None of the mentioned
Explanation: Particle size classification used only as a designation of particle sizes, and do not signify the naturally occurring types which are mixtures of a particle of different sizes.
8. Unified soil classification system (USCS) was developed by ____________
a) Kozney
b) Atterberg
c) Casagrande
d) Rankine
Explanation: In 1940, casagrande originally developed the unified soil classification system (USCS).
9. The USCS system was used for which of the following purpose during World War 2?
a) Air field construction
b) Dam construction
c) Foundation
d) Earth slopes
Explanation: In the earlier stages of World War 2, the USCS system was used for air field construction.
10. According to USCS, the fined grained soil are classified on the basis of _____________
a) Plasticity
b) Grain size distribution
c) Group index
d) Particle size composition
Explanation: According to USCS the fine grained soils, whose behavior is controlled by plasticity, are classified on the basis of their plasticity.