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MCQ
201. The effective size of a soil is-[MES-16]
D10
D20
D40
D60
ব্যাখ্যা: D10 is called as effective particle size. This means that 10% percent of the particles are finer and 90% of the particles are coarser than D10 This is the size at 10% finer by weight
202. Which of the following is practically impermeable? [BREB-15]
Gravel
Sand mixture
Coarse sand
Clay
203. When water content in a soil is reduced beyond the shrinkage limit, the soil will be in a- [BREB-15]
solid state
semi-solid state
liquid state
plastic state
204. Which of the following soil is transported by wind?
Talus
Drift
Loess
all of these
205. Uniformity coefficient of a soil is [HED-19]
equal to or greater than 1
equal to 1
equal to or less than 1
none of these
ব্যাখ্যা: The uniformity coefficient (cu) is defined as the ratio of D60 10 Dio A value of cu greater than 4 to 6 classific the soil as well graded. When cu is less than 4, it is classified as poorly graded or uniformly graded soil. Uniformly graded soil has identical particles with CU value approximately equal to 1.
206. Void ratio (e) is-. [MES-16]
Vv/V
Vv/Vs
Vs/V
V/Vs
207. A soil consolidated under the existing over-burden pressure, is called- [HED-19]
Pre-consolidated
Over-consolidated
Normally consolidated
None of these
ব্যাখ্যা: Over-consolidation is a relative term which compare the stress acting on soild in current state, to highest stress experienced by the soil. If the current stress is less than that applied in the past the soil is over consolidated.
208. Soils are derived from..............rocks.
igneous
metamorphic
sedimentary
any one of these
209. ১৭৫। The property of the soil mass which permits the seepage of water through its interconnecting voids, called- [BREB-15]
capillarity
porosity
permeability
none of these
ব্যাখ্যা: The property of the soil by which permits the flow of fluid through it is called permeability of the soil permeability can be defined as the a bility of a porous mass to allow passage of water through the medium.
210. The uniformity coefficient of soil is defined as the ratio of-[MOCA-19]
D40 to D10
D40 to D20
D50 to D10
D60 to D10
ব্যাখ্যা: সাম্যতা গুণাঙ্ক বা সমতার সহগ Cu =D60 /D10 এখানে, D60 বলতে বুঝায় 60% কণার আকার কার্যকরী আকার অপেক্ষা D10 সূক্ষ্ম এবং 40% স্কুল।
211. Capillary rise will be greater in [BGFCL-17]
gravel
fine sand
silt
coarse
ব্যাখ্যা: Clay soil has the highest capillarity, followed by loam and then sandy soil.
212. The bearing capacity of soil can be improved by-[BREB-15]
increasing the depth of footing
draining the sub-soil water
ramming the granular material like crushed stone in the soil
all of the above
ব্যাখ্যা: The following techniques can be used for improving bearing capacity of soil as per the site condition. (1) Increasing depth of foundation (i) Draining the soil (iii) Compacting the soil (iv) Confining the soil (v) Replacing the poor soil (vi) Using grouting material (vii) Stabilizing the soil with chemicals.
213. IF SPT of clayey soil is 2 then the soil is - [MES-16]
Soft
Hard
Medium
Stiff
ব্যাখ্যা: Very soft < 2; Soft 2-4: Medium=4-8 Stiff8-15; Very stiff = 15-30; Hard => 30
214. Standard Penetration Test (SPT) tube length- [MES-16]
6"
18"
12"
24"
ব্যাখ্যা: The test uses a thick walled sample tube, with an outside diameter of 50.8 mm or 2" and inside diameter of 35 mm or 1.8 and a length of arround 650 mm or 26"
215. The SG of sandy soil is- [BREB-15, MOCA-19]
1.2
2.2
1.8
2.7
■ ব্যাখ্যা: বালিমাটির আপেক্ষিক গুরুত্ব সাধারণত 2.65 এর কাছাকাছি হয়ে থাকে।
216. When a cohesionless soil attains quick condition, it looses- [HED-19]
Shear strength
Bearing capacity
Both a and b
Neither a and b
ব্যাখ্যা: Cohesionless soilds are defined as any free running type of soil such as sand, Gravel and stone. Cohesionless soil attains quick condition then it lose it's shear strengh and bearing capacity.
217. Water content of soil can- [HED-19]
never be greater than 100%
be less than 50%
from 0 to 100%
be greater than 100%
ব্যাখ্যা: Water weight and soild soil weight ratio is called water content. Water content (w)=weight of water / weight of soild =(Ww/Ws)*100
218. The soil transported by wind is called-
aeolian soil
alluvial soil
marine soil
lacustrine soil
219. The property of a soil which is of great importance in finding settlement of structures. is- [BREB-15]
permeability
shear strength
consolidation
compressibility
ব্যাখ্যা: Consolidation is a natural process where soil below the building and other structure compacted by the transferred load to the soil through the provided foundation system.
220. The soil transportated by running water is called-
aeolian soil
alluvial soil
marine soil
lacustrine soil