323. Pick up the correct statement from the following :
A. Before laying the sewer line, location of manholes is decided
B. The sewer pipes are laid starting from their out fall ends
C. The offset line is laid on the surface on the side which is not likely to be disturbed during digging
D. All the above.
324. Pick up the correct statement from the following :
A. The upper portion of a deep man hole is called access shaft
B. The lower portion of the man hole is known as the working chamber
C. The invert portion of the man hole is called the benching
D. All the above.
325. Solids in sewage are in the form of
A. suspended solids
B. dissolved solids
C. colloidal solids
D. All the above.
326. In sewage, the organic matter is found as
A. Carbohydrates
B. Fats and oils
C. Nitrogenous compounds
D. All of these.
327. The strength of sewage depends upon
A. volatile solids
B. fixed solids
C. suspended solids
D. none of these.
328. Pick up the correct statement from the following :
A. Sulphides and sulphates cause aerobic, and/or anaebic decomposition
B. In sewage, sulphides and sulphates are formed due to the decomposition of substances containing sulphur
C. In the initial decomposition of sulphur substances, the hydrogen sulphide gas is evolved
D. All the above.
329. Matheomolobinemia, a blue baby disease is caused due to the presence in potable water of
A. sulphides
B. sulphates
C. nitrates
D. free ammonia.
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