3668. একটি বস্তুর বাতাসে ওজন = 3kg, পানিতে ওজন = 2.5 kg হলে Specific gravity কত? [MOLE-19]
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)
3669. The failure of foundation of a building is due to-[BB-20]
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.
3670. The unit weight of soil mass is also called- [MOCA-19]
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.
3671. The ratio of specific weight of a liquid to the specific weight of pure water at a standard temperature is called- [HED-19]
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
3675. Uniformity coefficient of a soil is [HED-19]
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.
3678. The performance of the soil, when used for pavement construction is found out by using-.[BB-20]
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.