MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Septic tank is a(i) Settling tank(ii) Digestion tank(iii) Aeration tank |
| A. | Only (i) |
| B. | (i) and (ii) |
| C. | (i) and (iii) |
| D. | Only (iii) |
| Answer» C. (i) and (iii) | |
| 2. |
The length of rectangular sedimentation tank should not be more than(Where ‘B’ is the width of the tank) |
| A. | B |
| B. | 2B |
| C. | 4B |
| D. | 8B |
| Answer» D. 8B | |
| 3. |
The most common cause of acidity in water is |
| A. | Carbon dioxide |
| B. | Oxygen |
| C. | Hydrogen |
| D. | Nitrogen |
| Answer» B. Oxygen | |
| 4. |
For normal sludge, the value of sludge index for Indian conditions is |
| A. | 0 to 50 |
| B. | 50 to 150 |
| C. | 150 to 350 |
| D. | 350 to 500 |
| Answer» D. 350 to 500 | |
| 5. |
Disinfection efficiency is |
| A. | Reduced at higher pH value of water |
| B. | Unaffected by pH value of water |
| C. | Increased at higher pH value of water |
| D. | Highest at pH value equal to 7 |
| Answer» B. Unaffected by pH value of water | |
| 6. |
The detention period and overflow rate respectively for plain sedimentation as compared to sedimentation with coagulation are generally |
| A. | Less and more |
| B. | Less and less |
| C. | More and less |
| D. | More and more |
| Answer» D. More and more | |
| 7. |
The suitable method for disinfection of swimming pool water is |
| A. | Ultra violet rays treatment |
| B. | Lime treatment |
| C. | By using potassium permanganate |
| D. | Chlorination |
| Answer» B. Lime treatment | |
| 8. |
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 |
| A. | Check valve |
| B. | Sluice valve |
| C. | Safety valve |
| D. | Scour valve |
| Answer» C. Safety valve | |
| 9. |
Which of the following chemical compounds can be used for de-chlorination of water? |
| A. | Carbon dioxide |
| B. | Bleaching powder |
| C. | Sulphur dioxide |
| D. | Chloramines |
| Answer» D. Chloramines | |
| 10. |
If the time of concentration is 9 minutes, then the intensity of rainfall according to British Ministry of Health formula will be |
| A. | 4 mm/hr |
| B. | 10 mm/hr |
| C. | 20 mm/hr |
| D. | 40 mm/hr |
| Answer» E. | |
| 11. |
Dissolved oxygen in streams is |
| A. | Maximum at noon |
| B. | Minimum at noon |
| C. | Maximum at midnight |
| D. | Same throughout the day |
| Answer» B. Minimum at noon | |
| 12. |
For a country like India, where rainfall is mainly confined to one season, the suitable sewerage system will be |
| A. | Separate system |
| B. | Combined system |
| C. | Partially combined system |
| D. | Partially separate system |
| Answer» B. Combined system | |
| 13. |
The percentage of chlorine in fresh bleaching powder is about |
| A. | 10 to 15 |
| B. | 20 to 25 |
| C. | 30 to 35 |
| D. | 40 to 50 |
| Answer» D. 40 to 50 | |
| 14. |
The percentage of filtered water, which is used for backwashing in rapid sand filters, is about |
| A. | 0.2 to 0.4 |
| B. | 0.4 to 1.0 |
| C. | 2 to 4 |
| D. | 5 to 7 |
| Answer» D. 5 to 7 | |
| 15. |
Select the correct relationship between porosity (N), specific yield (y) and specific retention (R) |
| A. | N = y + R |
| B. | y = N + R |
| C. | R = N + y |
| D. | R > (N + y) |
| Answer» B. y = N + R | |
| 16. |
A pipe which is installed in the house drainage to preserve the water seal of traps is called |
| A. | Vent pipe |
| B. | Anti-siphonage pipe |
| C. | Waste pipe |
| D. | Soil pipe |
| Answer» C. Waste pipe | |
| 17. |
The rate of Alteration of pressure filters is |
| A. | Less than that of slow sand filters |
| B. | In between the filtration rate of slow sand filters and rapid sand filters |
| C. | Greater than that of rapid sand filters |
| D. | Equal to that of slow sand filters |
| Answer» D. Equal to that of slow sand filters | |
| 18. |
The type of valve which allows water to flow in one direction but prevents its flow in the reverse direction is |
| A. | Reflux valve |
| B. | Sluice valve |
| C. | Air relief valve |
| D. | Pressure relief valve |
| Answer» B. Sluice valve | |
| 19. |
Which of the following is not a water borne disease? |
| A. | Dysentery |
| B. | Cholera |
| C. | Typhoid |
| D. | Malaria |
| Answer» E. | |
| 20. |
The type of sewer which is suitable for both combined and separate system is |
| A. | Circular sewer |
| B. | Egg shaped sewer |
| C. | Horseshoe type sewer |
| D. | Semi-elliptical sewer |
| Answer» C. Horseshoe type sewer | |
| 21. |
Percentage of bacterial load that can be removed from water by the process of plain sedimentation is about |
| A. | 10 to 25 |
| B. | 50 |
| C. | 75 |
| D. | 100 |
| Answer» D. 100 | |
| 22. |
If the coli form bacteria is present in a sample of water, then the coli-form test to be conducted is(i) Presumptive coli-form test(ii) Confirmed coli-form test(iii) Completed coli-form test |
| A. | Only (i) |
| B. | Both (i) and (ii) |
| C. | Both (i) and (iii) |
| D. | All (i), (ii) and (iii) |
| Answer» E. | |
| 23. |
The rate of BOD exerted at any time is |
| A. | Directly proportional to BOD satisfied |
| B. | Directly proportional to BOD remaining |
| C. | Inversely proportional to BOD satisfied |
| D. | Inversely proportional to BOD remaining |
| Answer» C. Inversely proportional to BOD satisfied | |
| 24. |
As compared to geometrical increase method of forecasting population, arithmetical increase method gives |
| A. | Lesser value |
| B. | Higher value |
| C. | Same value |
| D. | Accurate value |
| Answer» B. Higher value | |
| 25. |
The dissolved oxygen level in natural unpolluted waters at normal temperature is found to be of the order of |
| A. | 1 mg/liter |
| B. | 10 mg/liter |
| C. | 100 mg/liter |
| D. | 1000 mg/liter |
| Answer» C. 100 mg/liter | |
| 26. |
The minimum dissolved oxygen which should always be present in water in order to save the aquatic life is |
| A. | 1 ppm |
| B. | 4 ppm |
| C. | 10 ppm |
| D. | 40 ppm |
| Answer» C. 10 ppm | |
| 27. |
Facultative bacteria are able to work in |
| A. | Presence of oxygen only |
| B. | Absence of oxygen only |
| C. | Presence as well as in absence of oxygen |
| D. | Presence of water |
| Answer» D. Presence of water | |
| 28. |
The maximum permissible limit for fluoride in drinking water is |
| A. | 0.1 mg/liter |
| B. | 1.5 mg/liter |
| C. | 5 mg/liter |
| D. | 10 mg/liter |
| Answer» C. 5 mg/liter | |
| 29. |
Sludge volume index is defined as the ratio of |
| A. | Percentage of sludge by volume to percentage of suspended solids by weight |
| B. | Percentage of sludge by volume to percentage of total solids by weight |
| C. | Percentage of suspended solids by weight to percentage of sludge by volume |
| D. | Percentage of total solids by weight to percentage of sludge by volume |
| Answer» B. Percentage of sludge by volume to percentage of total solids by weight | |
| 30. |
The pathogens can be killed by |
| A. | Nitrification |
| B. | Chlorination |
| C. | Oxidation |
| D. | None of the above |
| Answer» C. Oxidation | |
| 31. |
For satisfactory working of a sludge digestion unit, the pH range of digested sludge should be maintained as |
| A. | 4.5 to 6.0 |
| B. | 6.5 to 8.0 |
| C. | 8.5 to 10.0 |
| D. | 10.5 to 12.0 |
| Answer» C. 8.5 to 10.0 | |
| 32. |
Sewage treatment units are designed for |
| A. | Maximum flow only |
| B. | Minimum flow only |
| C. | Average flow only |
| D. | Maximum and minimum flow |
| Answer» D. Maximum and minimum flow | |
| 33. |
The distribution mains are designed for |
| A. | Maximum daily demand |
| B. | Maximum hourly demand |
| C. | Average daily demand |
| D. | Maximum hourly demand on maximum day |
| Answer» E. | |
| 34. |
Which of the following values of pH represents a stronger acid? |
| A. | 2 |
| B. | 5 |
| C. | 7 |
| D. | 10 |
| Answer» B. 5 | |
| 35. |
Limestone powder is injected during pulverised coal burning in boilers to __________ the flue gases. |
| A. | reduce SO2 content in |
| B. | catalytically convert SO2 to SO3 in |
| C. | increase the dew point of |
| D. | none of these. |
| Answer» B. catalytically convert SO2 to SO3 in | |
| 36. |
BOD of raw municipal sewage may be in the range of about __________ mg/litre. |
| A. | 43497 |
| B. | 43743 |
| C. | 150-300 |
| D. | 2000-3000 |
| Answer» D. 2000-3000 | |
| 37. |
Direct reaction of unsaturated hydrocarbons with either NO or NO2 produces an eye irritating pollutant compound known as |
| A. | photochemical smog. |
| B. | peroxy acetyl nitrate (PAN) or methyl nitrile. |
| C. | benzopyrene. |
| D. | poly acrylonitrile |
| Answer» C. benzopyrene. | |
| 38. |
Presence of high concentration of ozone and smog in atmospheric air causes the |
| A. | embrittlement & decrease of folding resistance of paper. |
| B. | cracking of rubber products. |
| C. | fading of dye on textiles. |
| D. | damage of electrical insulator on high tension power line. |
| Answer» C. fading of dye on textiles. | |
| 39. |
Nitrogen oxides (NOx) is not produced in the __________ industry. |
| A. | nitric acid making |
| B. | nitrogenous fertiliser |
| C. | detergent |
| D. | any of these |
| Answer» D. any of these | |
| 40. |
Inhalation of silica dust causes a disease called |
| A. | bronchitis |
| B. | silicosis |
| C. | pneumoconiosis |
| D. | none of these |
| Answer» C. pneumoconiosis | |
| 41. |
Which of the following is the most efficient for removal of very finely divided suspended solids and colloidal matter from the polluted water stream ? |
| A. | Sedimentation tank |
| B. | Circular clarifier |
| C. | Mechanical flocculation |
| D. | Chemical coagulation |
| Answer» E. | |
| 42. |
Noise emitted by a ventilation fan at a distance of 3 metres is about __________ decibels. |
| A. | 85 |
| B. | 105 |
| C. | 125 |
| D. | 145 |
| Answer» C. 125 | |
| 43. |
TLV of ammonia, nitrogen dioxide and phenol vapor in air is __________ ppm. |
| A. | 5 |
| B. | 100 |
| C. | 1000 |
| D. | 2000 |
| Answer» B. 100 | |
| 44. |
In sewage treatment, its sedimentation is speeded up by commonly adding |
| A. | hydrochloric acid. |
| B. | lime. |
| C. | copper sulphate. |
| D. | sodium sulphate. |
| Answer» C. copper sulphate. | |
| 45. |
Very small amount of air pollutants are present in stratosphere also; though most of the atmospheric pollutants are present in the troposphere. Which of the following atmospheric pollutants does not cause the ozone layer depletion in atmosphere at tremendous rate ? |
| A. | CO |
| B. | SO2 |
| C. | NOx |
| D. | CFC (chloro fluoro carbons) |
| Answer» B. SO2 | |
| 46. |
Exposure to SO2 containing chimney gases results in the |
| A. | reduction in strength of leather & cloth. |
| B. | acceleration of corrosion rates of metals. |
| C. | increased drying & hardening time of paints. |
| D. | all (a), (b)and(c). |
| Answer» E. | |
| 47. |
Which of the following plants does not emit appreciable amount of SO2 in atmosphere ? |
| A. | Thermal power plant |
| B. | Petroleum refinery |
| C. | Nitric acid plant |
| D. | Sulphuric acid plant |
| Answer» D. Sulphuric acid plant | |
| 48. |
A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of __________ high above earth's atmosphere, which absorbs it. |
| A. | hydrogen |
| B. | carbon dioxide |
| C. | ozone |
| D. | none of these |
| Answer» D. none of these | |
| 49. |
Presence of a certain minimum quantity of flourine is desirable in potable water to prevent |
| A. | dental cavities |
| B. | scale formation |
| C. | water-borne disease |
| D. | corrosion |
| Answer» B. scale formation | |
| 50. |
Which of the following is not a practical method of low level radioactive waste disposal ? |
| A. | Dilution with inert material. |
| B. | Discharging to atmosphere through tall stacks after dilution. |
| C. | Disposing off in rivers & oceans. |
| D. | Filling in steel crates and shooting it off out of earth's gravity. |
| Answer» E. | |