MCQ
21721. 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।
21722. 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.
21723. 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
21724. 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.
21725. 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%
21726. 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
21727. The failure of foundation of a building is due to-[BB-20]
lateral escape of the supporting material
withdrawal of subsoil moisture
unequal settlement of soil
all of the above
ব্যাখ্যা: ব্যাখ্যা: There are many causes the failure of foundation such as-
•Poor drainage include short down spouts, clogged gutter, or lack of waterproffing.
•Weather conditions.
•Poor soil conditions.
•Poor building site and ground prepration.
21728. 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.
21729. 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"
21730. একটি বস্তুর বাতাসে ওজন = 3kg, পানিতে ওজন = 2.5 kg হলে Specific gravity কত? [MOLE-19]
1
4
6
5
ব্যাখ্যা: ব্যাখ্যা: কোনো পদার্থের ঘনত্বের সাথে পানির ঘনত্বের অনুপাতকে Specific gravity বলে।
Specific gravity( G_1 )= বাতাসে ওজন / বাতাসে ওজন - পানিতে ওজন
= 3/3-2.5=6 (No unite)
21731. 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
21732. 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
21733. 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.
21734. The degree of saturation for the moist soil isabout- [MOD-20]
0%
25 to 50%
1 to 25%
50 to 75%
21735. Saturated Soil-এর Degree of Saturation কত? [MOCA-19]
0.00
0.50
2.00
1.00
21736. 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.
21737. 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%
21738. শক্ত মৃত্তিকার জন্য N-এর মান কত?
৩১ থেকে ৪০
৫১ থেকে ৬০
৬১ থেকে ৭০
৪১ থেকে ৫০
21739. 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।
21740. 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।