# GATE Questions & Answers of Unified and Indian standard soil classification system

## What is the Weightage of Unified and Indian standard soil classification system in GATE Exam?

Total 8 Questions have been asked from Unified and Indian standard soil classification system topic of Soil Mechanics subject in previous GATE papers. Average marks 1.25.

A fine grained soil is found to be plastic in the water content range of 26.48%. As per Indian Standerd Classification System, the soil is classified as

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As per Indian Standard Soil Classification System (IS: 1498 - 1970), an expression for A-line is

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The clay mineral primarily governing the swelling behavior of Black Cotton soil is

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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

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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

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The laboratory test results of a soil sample are given below:

Percentage finer than 4.75 mm = 60
Percentage finer than 0.075 mm = 30
Liquid Limit = 35%
Plastic Limit = 27%

The soil classification is

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Group symbols assigned to silty sand and clayey sand are respectively

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Sieve analysis on a dry soil sample of mass 1000 g showed that 980 g and 270 g of soil pass through 4.75 mm and 0.075 mm sieve, respectively. The liquid limit and plastic limits of the soil fraction passing through 425$\mathrm{\mu }$ sieves are 40% and 18% respectively. The soil may be classified as