126. The bacterias which require free oxygen for their survival, are called
127. Maximum threshold number permitted for indicating the odour of public water supplies, is
128. 45 litres of water per person per day, is provided in
129. Turbidity of water may be caused due to
130. The maximum pressure to which cast iron pipes may be subjected to, is
131. The type of pipe commonly used in water supply distribution schemes, is
132. The valve shown in the below figure, is generally known as
133. The population of a city in 2000 is 50, 000. The average per decade of the previous records of population is 5000 and average percentage per decade is 20%. The population of the city based on geometrical increase method, in the year 2020 will be
134. Before constructing a dam, the factor to be considered for controlling sedimentation, is
135. The process of passing water through beds of granular materials, is called
136. If Q is discharge is cubicmetres per sec and D is the economical diameter of the pipe. According to Lea
137. Water to the consumers may be supplied from
138. If the average daily demand of a city of 50, 000 population, is 20 m.l.d., the maximum daily demand is
139. Recuperation test is carried out to determine
140. The discharge for the confined tube well is obtained from
141. Turbidity of water is expressed
142. The ratio of the maximum daily consumption to the average daily demand, is
143. The ratio of discharge and plan area of a continuous flow type settling tank, is known
144. The maximum pressure to which a pipe is subjected to during its operation, is known
145. To control the growth of algae in reservoirs, the compound which is used, is
146. Pick up the wrong nominal internal diameter of cast iron (spun) pipes in mm from the following :
147. Hardness of water can be removed by boiling if it is due to
148. A well is considered to be good if it is sunk into
149. The nitrate concentration in domestic water supplies, is generally limited to