McqMate
| 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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