21.The ratio of the difference between the voids ratio in its loosest state and its natural void ratio to the difference between the void ratio is the loosest and densest state, is called ?
- density index
- relative density
- degree of density
- any one of these
22.When the hydrometer analysis is performed, it requires correction for ?
- temperature only
- meniscus only
- dispersing agent only
- all of these
23.The property of a soil which enables to regain its strength lost on remoulding in a short time without change of moisture content, is called ?
- unconfined compressive strength
- sensitivity
- thixotropy
- relative density
24.The liquid limit exists in ?
- sandy soils
- gravel soils
- silty soils
- silty soils
25.The coefficient of volume compressibility is ?
- directly proportional to the void ratio
- inversely proportional to the void ratio
- directly proportional to the coefficient of compressibility
- inversely proportional to the coefficient of compressibility
26.The shrinkage index is equal to ?
- liquid limit + plastic limit
- plastic limit - liquid limit
- liquid limit - shrinkage limit
- shrinkage limit - liquid limit
27.The smallest sieve size according to Indian standards is ?
- 0.0045 mm
- 0.045 mm
- 0.45 mm
- 0.154 mm
28.Silt is a ?
- material deposited by a glacier
- soil composed of two different soils
- fine grained soil with little no plasticity
- clay with a high percentage of the clay mineral
29.Which of the following have an influence on the value of permeability ?
- Grain size
- Void ratio
- Degree of saturation
- all of these
30.The neutral stress on the soil is due to the ?
- external load acting on the soil
- weight of the soil particles
- weight of water present in soil pores
- both (a) and (b)
31.The pressure exerted by water on the soil through which it percolates, is known as ?
- hydrostatic pressure
- effective pressure
- seepage pressure
- none of these
32.The property of the soil mass which permits the seepage of water through its interconnection voids, is called ?
- capillarity
- permeability
- porosity
- none of these
33.The piping failure in a hydraulic structure can be prevented by ?
- diverting the seepage water into filter wells
- increasing the creep length of flow of water
- increasing the stress due to weight of the structure
- all of the above
34.The consolidation of a soil is defined as the ?
- process of compression by gradual reduction of pore space under steady load
- process which gives gradual decrease of water content at constant load
- change in volume of soil due to expulsion of pure water under an applied load
- any one of the above
35.The time factor for a clay layer is ?
- a dimensionless parameter
- directly proportional to permeability
- directly proportional to drainage
- none of these
36.Which one of the following parameters can be used to estimate the angle of friction of a sandy soil ?
- Particle size
- Roughness of particle
- Density index
- Particle size distribution
37.The effect of cohesion on a soil is to ?
- reduce both active and passive earth pressure intensities
- increase both active and passive earth pressure intensities
- reduce active earth pressure intensity but to increase passive earth pressure intensity
- increase active earth pressure intensity but to reduce passive earth pressure intensity
38.According to I.S. code, the total settlement of isolated footings for cohesive soil should be ?
- 30mm
- 40mm
- 50mm
- 65mm
39.The degree of consolidation is proportional directly ?
- to time and inversely to drainage path
- to drainage path and inversely to time
- to time and inversely to the square of drainage path
- to square of drainage path and inversely to time
40. Which of the following statement is correct ?
- The settlement of a flexible footing on cohesionless soil is less in the centre than at the edges.
- The settlement of a rigid footing on cohesionless soil is uniform throughout.
- The settlement of a flexible footing on cohesive soil is more in the centre than at the edges.
- all of the above.
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