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301. |
In dry feeding type of coagulants, the dose of coagulant is controlled by |
A. | scrapers |
B. | worm wheel |
C. | paddles |
D. | none of these |
Answer» B. worm wheel |
302. |
The open wells or dug wells are also known as |
A. | shallow wells |
B. | draw wells |
C. | percolation wells |
D. | all of these |
Answer» D. all of these |
303. |
The maximum permissible quantity of lead in water for domestic supplies is |
A. | 0.01 ppm |
B. | 0.05 ppm |
C. | 0.50 ppm |
D. | 1 ppm |
Answer» B. 0.05 ppm |
304. |
The ideal method of disinfection of swimming pool water is by |
A. | chlorination |
B. | lime treatment |
C. | ozonisation |
D. | ultra-violet rays |
Answer» C. ozonisation |
305. |
A pipe sunk into the ground to tap the underground water is called |
A. | open well |
B. | tube well |
C. | artesian well |
D. | infiltration well |
Answer» B. tube well |
306. |
The method adopted for removing, bushes branches, debries etc. from water is known as |
A. | sedimentation |
B. | coagulation |
C. | screening |
D. | filteration |
Answer» C. screening |
307. |
The water carriage sewage system removes |
A. | domestic sewage |
B. | industrial sewage |
C. | storm sewage |
D. | all of these |
Answer» D. all of these |
308. |
Colloidal impurities if associated with organic matter having bacterias becomes the chief source of |
A. | hardness |
B. | epidemic |
C. | alkalinity |
D. | bad taste |
Answer» B. epidemic |
309. |
The quantity of storm water (Q) in liter per second is given by Q = CA3/4. This formula is called |
A. | Fanning's formula |
B. | Ryve's formula |
C. | Dicken's formula |
D. | Inglis formula |
Answer» C. Dicken's formula |
310. |
The leakage of sewage from the sewer into the soil surrounding the water is called ex-filtration. |
A. | Agree |
B. | Disagree |
Answer» A. Agree |
311. |
Which of the following statement is correct? |
A. | The sub-surface sources are not affected by draught. |
B. | Infiltration galleries are most suitable for increasing the surface source supply, in dry season. |
C. | The rate at which water percolates into well under safe maximum critical depression head is called yield of well. |
D. | all of the above |
Answer» D. all of the above |
312. |
The percentage ratio of the oxygen available in sewage to the oxygen required to satisfy one stage of bio-chemical oxygen demand (B.O.D.) is termed as |
A. | chemical oxygen demand |
B. | oxygen consumed |
C. | relative stability |
D. | bio-oxygen demand |
Answer» C. relative stability |
313. |
The continuous flow of water may be expected from |
A. | surface springs |
B. | artesian springs |
C. | gravity springs |
D. | all of these |
Answer» B. artesian springs |
314. |
The void spaces in the filtering material act like a |
A. | drain |
B. | inlet |
C. | tiny settling basins |
D. | outlet |
Answer» C. tiny settling basins |
315. |
Residual chlorine in water is determined by |
A. | versenate |
B. | starch-iodide |
Answer» B. starch-iodide |
316. |
Rpid sand filters are suitable for small towns and villages. |
A. | Yes |
B. | No |
Answer» B. No |
317. |
The prsence of sodium chloride in water |
A. | causes bad taste |
B. | softens the water |
C. | increases hardness of water |
D. | stops epidemic |
Answer» B. softens the water |
318. |
A scour valve, in a water distribution system, is provided at |
A. | low points |
B. | high points |
C. | junction points |
D. | all of these |
Answer» A. low points |
319. |
The growth of population may be conveniently represented by |
A. | semi-logarthmic curve |
B. | logistic curve |
C. | straight line curve |
D. | all of these |
Answer» B. logistic curve |
320. |
The earth's water circulatory system is known as. |
A. | water cycle |
B. | hydrological cycle |
C. | precipitation cycle |
D. | all of these |
Answer» B. hydrological cycle |
321. |
The odour of water can be determined by |
A. | thermometer |
B. | Osmoscope |
C. | Jackson's turbidimeter |
D. | none of these |
Answer» B. Osmoscope |
322. |
Grit should be removed from sewage before |
A. | their disposal in dilution water |
B. | their lifting by means of pump etc. |
C. | settling of sewage in sedimentation tank |
D. | all of the above |
Answer» D. all of the above |
323. |
When a pervious strata is sandwitched between two impervious strata of cup shape, the well is called a tube well. |
A. | True |
B. | False |
Answer» B. False |
324. |
If the level of source of water is higher than that of the place of consumption, the system adopted for supplying water is |
A. | pumping system |
B. | gravitational system |
C. | combined pumping and gravity system |
D. | any one of these |
Answer» B. gravitational system |
325. |
The residual chlorine |
A. | is zero |
B. | is maximum |
C. | reappears |
Answer» C. reappears |
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