104. The maximum permissible limit for iron in drinking water is:
ব্যাখ্যাঃ The present recommended limit for iron in water 0.3- 1 mg/L. It is based on taste and appearance rather than on any deterimental health effect.
ব্যাখ্যাঃ Concrete slump test or slump cone test is to determine the workability or consistency of concrete mix prepared at the laboratory or the construction site during the progress of work
109. When a cohesionless soil attains quick condition, it looses:
ব্যাখ্যাঃ 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.
111. The transverse reinforcements provided at right angles to the main reinforcements in a slab---
ব্যাখ্যাঃ The distribution reinforcement have termed as transvers reinforcement is provided that to resist the stresses produced by temperature changes and shrinkage of concrete in that direction.
113. In order to improve farming methods, we need-
ব্যাখ্যা: খামার পদ্ধতি উন্নয়ন বা উন্নতি করার লক্ষ্যে আমাদের যন্ত্রপাতির (machinery) প্রয়োজন। কারণ উন্নত যন্ত্রপাতি ছাড়া খামার পদ্ধতি উন্নয়ন করা সম্ভব নয়।
115. Which types of forces are generated during earthquake?
ব্যাখ্যা: Earthquake force however possess several characteristic that make them unique in comparison with any other force such as gravity wind and thermal force. Earthquake force are the result of a back and forth, and up and down montior of the ground that supports a structure.
ব্যাখ্যা : Machine foundation are subjected to the dynamic lond caused by the machine. Theses dynamic loud are then transferred to the foundation supporting the machine
117. The most suitable equipment for compacting clay soil is a:
ব্যাখ্যাঃ Sheep foot roller are used for compacting fine gramed soils such as heavy clays and silty clay. Sheep foot rollers are used for campaction of soil in dams, embankments, subgrade layers in pavements and rail road construction projects.
ব্যাখ্যা: BOD-এর সাহায্যে পানিতে অক্সিজেনের মাত্রা কতটুকু আছে তা পরিমাপ করা হয়। BOD-এর পূর্ণরূপ Biochemical Oxyzen Demand। পানির বিশুদ্ধতা পরিমাপ করার জন্য ৫ দিন 20℃ তাপমাত্রা প্রয়োগ করা হয়।
119. The book in which chain measurements are entered is called:
ব্যাখ্যা : The field measurements sketches and relevant notes are recorded for future refernce in a note book known as field book. There are two types of field book such as single line and double line field book.