24) Which structure is constructed for the purpose of retaining earth or other materials like coal, ore, water etc.?

25) What is the name of the structure in which components such as beam, column and footing are monolithic in design and construction?

26) Which diameter of reinforcement bars are used for heavy foundations, large girders or counterforts?

27) Which type of mixer used for large quantity of concrete?

28) Where does covering of render is used?