Q.1
The major disadvantage of lime soda process of water softening is that
Q.2
Turbidity is measured on
Q.3
The maximum discharge of a tube well is about
Q.4
The velocity of flow does not depend on
Q.5
The slope of sewer shall be
Q.6
Which of the following unit works in anaerobic conditions?
Q.7
Which of the following methods of analysis of water distribution system is most suitable for long and narrow pipe system?
Q.8
The detention period in coagulation tanks is usually kept as
Q.9
As compared to higher pH values, the contact period required for efficient chlorination at lower pH values is
Q.10
The disinfection efficiency of chlorine increases by
(i) Decreasing the time of contact
(ii) Decreasing the temperature of water
(iii) Increasing the temperature of water
Q.11
Composting and lagooning are the methods of
Q.12
Most of the bacteria in sewage are
Q.13
The effect of increasing diameter of sewer on the self cleansing velocity is
Q.14
For the same solid content, if the quantity of sludge with moisture content of 98% is X, then the quantity of sludge with moisture content of 96% will be
Q.15
The overflow rate for plain sedimentation tanks is about
Q.16
The main disadvantage of cement concrete sewers is
Q.17
The population of a town in three consecutive years are 5000, 7000 and 8400 respectively. The population of the town in the fourth consecutive year according to geometrical increase method is
Q.18
The suitable method of forecasting population for a young and rapidly increasing city is
Q.19
The relative stability of a sewage sample, whose dissolved oxygen is same as the total oxygen required to satisfy BOD, is
Q.20
Which of the following compounds is widely used for algae control?
Q.21
The process of lagooning is primarily a means of
Q.22
The ratio of 5 day BOD to ultimate BOD is about
Q.23
The type of valve, which is provided on the suction pipe in a tube-well, is
Q.24
Which of the following chemical compounds can be used for de-chlorination of water?
Q.25
The type of valve which is provided to control the flow of water in the distribution system at street corners and where the pipe lines intersect is
Q.26
The suitable method for disinfection of swimming pool water is
Q.27
Average rate of water consumption per head per day as per Indian Standard is
Q.28
The suitable layout of distribution system for a city with roads of rectangular pattern is
Q.29
For a given discharge, the efficiency of sedimentation tank can be increased by
Q.30
The settling velocity of a particle in a sedimentation tank depends on
0 h : 0 m : 1 s