46152. Pick up the incorrect statement from the following. The underground sources of water, is from
46153. Disinfection of drinking water, is done to remove
46154. Sunlight
46155. The expected discharge to be obtained from an open well sunk in coarse sand is 0.0059 cumec. If the working depression head of the well is 3 m, the minimum diameter of the well, is
46156. Average annual rainfall at any station is the average of annual rainfall over a period of
46157. Time of concentration
46158. If four fires break out in a city of population 40 lakhs and if each hydrant has three streams and duration of each fire is four hours, the total quantity of water required, is
46159. The fire demand of a city may be worked out by
46160. Aeration of water is done to remove
46161. The yield of a rapid gravity filter as compared to that of slow sand filter, is
46162. While determining the yield of open wells by the pumping test
46163. Increase in population of a rapidly growing city, may be estimated by
46164. Pick up the correct statement from the following regarding the pressure conduits :
46165. The standard B.O.D. at 20&Deg;C, is taken for the consumption in
46166. Percussion drilling is unsuitable in
46167. Disinfection of water with ozone is not good because
46168. An earth formation which, although porous and capable of absoring water does not provide an appreciable supply to wells, is known as
46169. Mathamoglobinemia, or blue baby disease is caused due to
46170. The main process to purify water by filtration, is
46171. Surface water is obtained from
46172. Hardness of water is caused due to
46173. Flow through period, in sedimentation tanks, is
46174. Normal values of overflow rate for plain sedimentation tank, is
46175. The force which develops in a pressure conduit supported on trestles, is
46176. After cleaning a slow sand filter, the filtered water is not used for
46177. A pressure conduit laid under ground, may not be subjected to
46178. The period of cleaning of a slow sand filter, is usually
46179. At the socket and spigot joint,
46180. Gravity conduits for carrying water from the source are
46181. Continuous flow of water can be expected from
46182. The maximum hourly consumption, is generally taken as
46183. A city supply includes
46184. During treatment of water, sedimentation is done
46185. E. Coli bacterias die in water having pH greater than
46186. Check valves are installed
46187. The equation in which Q is yearly run off in cm, P is yearly total rainfall in cm, H is difference of R.L.s. of lowest and highest points and A is area of catchment in square metres, is known as
46188. If intensity of rainfall in cm per hour is I, percentage coefficient of run-off is P, area of catchment in square kilometres is A, the total run-off Q, is given by
46189. Hard water contains
46190. The main disadvantage of hard water, is
46191. An area is declared drought affected if its mean rainfall is less than
46192. The best quality of filter material is obtained from quartzite if it does not loose weight when placed in hydro-chloric acid for 24 hours, more than
46193. If discharge of a pump is 0.16 cumecs, the economic diameter of pipe, is
46194. Hard water for public water supply is discarded because
46195. Pick up the correct statement from the following regarding radial flow centrifugal pumps :
46196. Quality of water is said to be good if it is
46197. The main draw-back of centrifugal pump, is
46198. The water level in an open well was depressed by pumping 2.5 m and recuperated 2.87 m in 3 hours and 50 minutes. The yield of the well per minute is
46199. Rapid gravity filter can only remove turbidity of water upto
46200. The best process of disinfection of public water supply, is by
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