টার্গেট - BPSC নন ডিপার্টমেন্ট রিটেন বইটি বর্তমানে BPSC রিটেন পরীক্ষার জন্য সেরা। BPSC এর বিগত সালের সকল লিখিত পরীক্ষার প্রশ্নের উত্তর এই বইয়ে দেওয়া হয়েছে।
ব্যাখ্যা: ব্যাখ্যা: As group index is a mean of rating the value of soil as a sub-grade material. It can be used for finding the performance and quality of the soil.
20243. Soil-এর uniformity coefficient-এর typical value কত হয়? [MOLE-19]
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)
20245. Saturated Soil-এর Degree of Saturation কত? [MOCA-19]
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.
20251. The failure of foundation of a building is due to-[BB-20]
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.
20252. The maximum size of the particles of clay is about- [MOCA-19]
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.
20254. The ratio of specific weight of a liquid to the specific weight of pure water at a standard temperature is called- [HED-19]
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
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.
20257. The SG of sandy soil is- [BREB-15, MOCA-19]