Civil Engineering - UPSC Civil Service Exam Questions

The following data pertain to a waste-water sample :
Initial D.O. = 8 mg/l
Final D.O. = 2 mg/l
Dilution = 1%.
The B.O.D. of the given wastewater sample is

If p is the specific gravity of the material used in the design of a masonry dam of triangular section, then the ratio between the height and base width of the dam for structural safety and stability is equal to

Consider the following statements relating to the stability of floating as well as submerged bodies :
1. A submerged body is stable when the centre of gravity is below the centre of buoyancy.
2. A floating body is stable when the centre of gravity is above the centre of buoyancy.
3. A floating body is stable when the centre of gravity is below the metacentre.
4. A submerged body is in stable equilibrium when the centre of gravity coincides with the centre of buoyancy.
Of these statements :

A vehcile was stopped in two seconds by fully jamming the brakes. The skid marks measured 9.8 metre's. The average skid resistance coefficient will be

Consider the following statements pertaining to intermediate stiffeners :
1. Stiffeners are provided to exclusively bear concentrated loads.
2. Stiffeners should bear tightly against top and bottom flanges.
3. Maximum spacing of stiffeners is restricted 180 t, where t is the thickness of web.
Which of the statements given above is are/correct ?