জিওটেকনিক্যাল ইঞ্জিনিয়ারিং MCQ
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261. A soil consolidated under the existing over-burden pressure, is called- [HED-19]
Pre-consolidated
Over-consolidated
Normally consolidated
None of these
ব্যাখ্যা: 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.
262. The unit weight of soil mass is also called- [MOCA-19]
dry density
bulk density
mass specific gravity
bulk specific gravity
ব্যাখ্যা: ব্যাখ্যা: Dry density of a soil is the ratio of total dry mass of soil to the total volume of soil. Dry density is related to the degree of compaction of soil mass.
263. The SG of sandy soil is- [BREB-15, MOCA-19]
1.2
2.2
1.8
2.7
ব্যাখ্যা: ■ ব্যাখ্যা: বালিমাটির আপেক্ষিক গুরুত্ব সাধারণত 2.65 এর কাছাকাছি হয়ে থাকে।
264. IF SPT of clayey soil is 2 then the soil is - [MES-16]
Soft
Hard
Medium
Stiff
ব্যাখ্যা: ব্যাখ্যা: Very soft < 2; Soft 2-4: Medium=4-8 Stiff8-15; Very stiff = 15-30; Hard => 30
265. 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: ব্যাখ্যা: Water weight and soild soil weight ratio is called water content.
Water content (w)=weight of water / weight of soild
=(Ww/Ws)*100
266. When a cohesionless soil attains quick condition, it looses- [HED-19]
Shear strength
Bearing capacity
Both a and b
Neither a and b
ব্যাখ্যা: 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.
267. 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: 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.
268. The ratio of the volume of voids to the total volume of soil mass is called- [MOD-20]
water content ration
void ratio
porosity
degree of saturation
269. The maximum size of the particles of clay is about- [MOCA-19]
0.0002mm
0.02mm
0.002mm
0.2mm
ব্যাখ্যা: ব্যাখ্যা: কণার আকার <0.002mm হলে কাদামাটি হিসাবে শ্রেণিবদ্ধ করা হয়।
270. 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: 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.
271. Capillary rise will be greater in [BGFCL-17]
gravel
fine sand
silt
coarse
ব্যাখ্যা: ব্যাখ্যা: Clay soil has the highest capillarity, followed by loam and then sandy soil.
272. The ratio of specific weight of a liquid to the specific weight of pure water at a standard temperature is called- [HED-19]
Density of liquid
Specific gravity of liquid
Compressibility of liquid
Surface tension of liquid
ব্যাখ্যা: ব্যাখ্যা: The specific gravity of an object is the ratio between the density of an object to a reference liquid. Usually our reference liquid in water, which has a density of 1g/ml. or 1g/cm³
273. 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: ব্যাখ্যা: সাম্যতা গুণাঙ্ক বা সমতার সহগ Cu =D60 /D10 এখানে, D60 বলতে বুঝায় 60% কণার আকার কার্যকরী আকার অপেক্ষা D10 সূক্ষ্ম এবং 40% স্কুল।
274. Standard Penetration Test (SPT) tube length- [MES-16]
6"
18"
12"
24"
ব্যাখ্যা: 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"
275. Void ratio (e) is-. [MES-16]
Vv/V
Vv/Vs
Vs/V
V/Vs
276. The relation between porosity N and void ratio(e) is given by- [MOCA-19]
n=(1+e)/e
n=e/(1+e)
e=n/(1-n)
e=(1-n)/n
277. The property of a soil which is of great importance in finding settlement of structures. is- [BREB-15]
permeability
shear strength
consolidation
compressibility
ব্যাখ্যা: 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.
278. The degree of saturation for fully saturated soil is- [MOCA-19]
0.25
0.75
1
0.50
ব্যাখ্যা: ব্যাখ্যা: Full saturated soil-এর Degree of saturation Sr = 1 বা 100%
279. The effective size of a soil is-[MES-16]
D10
D20
D40
D60
ব্যাখ্যা: 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
280. Water content = 15%, Sp. gravity = 2.5, Void ratio = 0.5, Degree of Saturation =? [MOLE-19]
75%
50%
60%
80%
ব্যাখ্যা: ব্যাখ্যা: Sr = Grω/e
Sr=2.5x0.15 x100/0.5
=75%