Test 2 - Consistency and Index Properties of Soils

Question 1 ప్రశ్న 1

Which statement correctly identifies the liquid limit, plastic limit and shrinkage limit of a fine-grained soil?

A Liquid limit separates solid and semi-solid states, while shrinkage limit separates plastic and liquid states. B Liquid limit separates plastic and liquid consistency states, plastic limit separates semi-solid and plastic states, and shrinkage limit marks the boundary below which further drying produces essentially no additional volume reduction. C All three limits represent the same water content but are determined using different laboratory apparatus. D Plastic limit is the water content at which all soil voids become filled with water.

Question 2 ప్రశ్న 2

Under the mechanical liquid-limit procedure in IS 2720 (Part 5), which statement is correct?

A Liquid limit is determined at 10 blows regardless of the flow curve. B Liquid limit is the water content corresponding to a soil thread of 3 mm diameter. C Liquid limit is obtained when a cone penetrates exactly 3 mm into the soil. D Liquid limit is determined from the water content corresponding to 25 blows on the flow curve, with groove closure measured over approximately 12 mm in the specified mechanical test.

Question 3 ప్రశ్న 3

Which observation correctly represents the endpoint used to determine the plastic limit of a soil by the rolling-thread method?

A A soil thread repeatedly rolled to approximately 3 mm diameter reaches a condition at which it crumbles under the specified rolling procedure. B A soil thread flows under its own weight after reaching 20 mm diameter. C A soil specimen shows no further reduction in volume during oven drying. D A grooved soil pat closes after 25 blows in the liquid-limit cup.

Question 4 ప్రశ్న 4

As the water content of a typical plastic fine-grained soil decreases from above its liquid limit to below its shrinkage limit, which sequence of consistency states is correct?

A Solid, semi-solid, plastic, liquid. B Plastic, liquid, solid, semi-solid. C Liquid, plastic, semi-solid, solid. D Liquid, semi-solid, plastic, solid.

Question 5 ప్రశ్న 5

A fine-grained soil has liquid limit 62% and plastic limit 27%. What is its plasticity index?

A 35 percentage points. B 27 percentage points. C 62 percentage points. D 89 percentage points.

Question 6 ప్రశ్న 6

A laboratory reports a liquid limit of 24% and a plastic limit of 29% for the same tested soil. According to the reporting convention in IS 2720 (Part 5), what plasticity index should be reported when the plastic limit is equal to or greater than the liquid limit?

A -5. B 5. C 0. D 29.

Question 7 ప్రశ్న 7

A soil has liquid limit 60%, plastic limit 25% and natural water content 39%. What is its liquidity index?

A 0.25. B 0.60. C 0.75. D 0.40.

Question 8 ప్రశ్న 8

For a soil having liquid limit 60%, plastic limit 25% and natural water content 39%, what is its consistency index?

A 0.40. B 0.60. C 1.00. D 1.40.

Question 9 ప్రశ్న 9

For a soil with a positive plasticity index, which mathematical relationship between liquidity index I_L and consistency index I_C is necessarily correct when both use the same liquid limit, plastic limit and natural water content?

A I_L + I_C = 1. B I_L × I_C = 1. C I_L = I_C for every natural water content. D I_L - I_C = 1.

Question 10 ప్రశ్న 10

A soil has liquid limit 48%, plastic limit 18% and natural water content 12%. What are its liquidity index and the appropriate interpretation?

A 0.20; the soil is within the plastic range. B 1.20; the soil is above the liquid limit. C -0.20; the natural water content is below the plastic limit. D -1.20; the natural water content must be above the liquid limit.

Question 11 ప్రశ్న 11

A fine-grained soil has liquid limit 55%, plastic limit 30% and natural water content 65%. What is its liquidity index, and what does it indicate?

A 0.40; the soil is between plastic and liquid limits. B 1.40; its natural water content exceeds the liquid limit. C 0.60; its natural water content is below the plastic limit. D -0.40; the soil is necessarily in the solid state.

Question 12 ప్రశ్న 12

A soil has liquid limit 65% and plastic limit 25%. If its liquidity index is 0.75, what is its natural water content?

A 45%. B 50%. C 65%. D 55%.

Question 13 ప్రశ్న 13

A soil has liquid limit 70%, plastic limit 30% and consistency index 0.25. Determine its natural water content.

A 60%. B 50%. C 40%. D 65%.

Question 14 ప్రశ్న 14

Soil A has liquid limit 45% and plastic limit 20%, while Soil B has liquid limit 60% and plastic limit 40%. Which comparison is correct?

A Soil B has a plasticity index 15 percentage points greater than Soil A. B Both soils have the same plasticity index because their liquid limits differ. C Soil A has plasticity index 25, while Soil B has plasticity index 20, so Soil A has the wider plastic water-content range. D Soil A is necessarily more compressible and more expansive than Soil B under every possible condition.

Question 15 ప్రశ్న 15

In a Casagrande flow-curve investigation, water content is 50% at 10 blows and 30% at 100 blows. Assuming a straight line on the plot of water content against log10(number of blows), what is the flow index?

A 10. B 30. C 20. D 40.

Question 16 ప్రశ్న 16

A soil gives water content 45% at 20 blows and 35% at 80 blows in a mechanical liquid-limit test. Assuming an exactly linear relationship between water content and log10(blow count), what is the interpolated water content at 25 blows, before rounding to the reporting precision?

A 40.00%. B 41.61%. C 45.00%. D 43.39%.

Question 17 ప్రశ్న 17

A soil has plasticity index 30 and flow index 12. What is its toughness index?

A 0.40. B 2.50. C 18.0. D 42.0.

Question 18 ప్రశ్న 18

Two soils have equal plasticity indices, but Soil P has a greater flow index than Soil Q. What relationship between their toughness indices necessarily follows?

A Soil P has the lower toughness index because toughness index is inversely proportional to flow index when plasticity index is fixed. B Soil P has the higher toughness index because both indices must rise together. C The two toughness indices must be equal because their plasticity indices are equal. D Neither toughness index can be compared unless soil specific gravity is supplied.

Question 19 ప్రశ్న 19

A remoulded soil has plastic limit 20% and shrinkage limit 12%. What is its shrinkage index?

A 12. B 20. C 8. D 32.

Question 20 ప్రశ్న 20

A remoulded soil pat initially has wet mass 50 g and wet volume 30 cm³. Its oven-dry mass is 35 g and dry volume is 22 cm³. Taking water density as 1 g/cm³ and using w_s = [(M_wet - M_dry) - rho_w(V_wet - V_dry)]/M_dry times 100, what is its shrinkage limit?

A 14.29%. B 22.86%. C 42.86%. D 20.00%.

Question 21 ప్రశ్న 21

A soil pat has initial volume 40 cm³ and oven-dry volume 32 cm³. Using volumetric shrinkage defined as the reduction in volume expressed as a percentage of the oven-dry volume, determine its volumetric shrinkage.

A 25%. B 20%. C 8%. D 80%.

Question 22 ప్రశ్న 22

A soil pat has oven-dry mass 48 g and oven-dry volume 30 cm³. Take water density as 1 g/cm³, initial water content as 27% and shrinkage limit as 12%. Using shrinkage ratio R = M_dry/(rho_w V_dry) and volumetric shrinkage V_S = R(w_initial - w_s), with water contents entered as percentages, what is the volumetric shrinkage?

A 15%. B 18%. C 24%. D 36%.

Question 23 ప్రశ్న 23

A soil has shrinkage limit 10%, plastic limit 22% and liquid limit 48%. Its current water content is 16%. Which consistency description and drying behaviour are appropriate under the conventional Atterberg-state model?

A Liquid state; further drying causes no volume change. B Semi-solid state; further drying toward the shrinkage limit can still reduce its volume. C Plastic state; the water content is above the plastic limit. D Solid state; the water content is already below the shrinkage limit.

Question 24 ప్రశ్న 24

A foundation engineer observes that Soil P has a substantially higher plasticity index than Soil Q. Which conclusion is most defensible without additional testing?

A Soil P must have exactly twice the undrained shear strength of Soil Q. B Soil P must have a lower liquid limit than Soil Q. C Soil P must have a greater bearing capacity under every field moisture condition. D Soil P has a wider plastic water-content range, but swelling, compressibility and strength require additional soil-characterization and engineering assessment.

Question 25 ప్రశ్న 25

A soil has liquid limit 64%, plastic limit 28%, natural water content 40% and flow index 18. Which combination correctly gives plasticity index, liquidity index, consistency index and toughness index, respectively?

A 36, 0.333, 0.667 and 2.00. B 36, 0.667, 0.333 and 0.50. C 24, 0.500, 0.500 and 1.33. D 36, 1.333, -0.333 and 2.00.

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