McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .
| 1. |
The presence of |
| A. | iron |
| B. | manganese |
| C. | sodium fluoride |
| D. | calcium carbonate |
| Answer» A. iron | |
| 2. |
The maximum permissible chlorine content for public supplies should be between |
| A. | 0.1 to 0.2 ppm |
| B. | 0.3 to 0.4 ppm |
| C. | 1.2 to 4 ppm |
| D. | 6.5 to 8 ppm |
| Answer» A. 0.1 to 0.2 ppm | |
| 3. |
Air vent pipe is not essentially required in a septic tank. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 4. |
The pocess of excluding large sized particles from water with the help of screens is called filteration. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 5. |
A pipe installed for ventilation purpose is called |
| A. | waste pipe |
| B. | soil pipe |
| C. | vent pipe |
| D. | anti-siphonage pipe |
| Answer» C. vent pipe | |
| 6. |
The presence of calcium and magnesium chloride in water causes |
| A. | softening |
| B. | bad taste |
| C. | hardness |
| D. | turbidity |
| Answer» C. hardness | |
| 7. |
In the process of screening, the screens should be inclined at an angle of |
| A. | 10? to 20? |
| B. | 30? to 40? |
| C. | 45? to 60? |
| D. | 70? to 85? |
| Answer» C. 45? to 60? | |
| 8. |
To prevent the formation of crystalline hydrates of 'Ice' of chlorine, the chlorine supply cylinders are kept at a temperature from |
| A. | 10?C to 20?C |
| B. | 20?C to 27?C |
| C. | 27?C to 37?C |
| D. | 38?C to 42?C |
| Answer» D. 38?C to 42?C | |
| 9. |
When chlorine is added to raw water at more than one point, the process is termed as break point chlorination. |
| A. | Right |
| B. | Wrong |
| Answer» B. Wrong | |
| 10. |
Manholes on sewer lines are provided for |
| A. | periodic cleaning |
| B. | providing air for oxidation |
| C. | removal of part of sewerage |
| D. | all of these |
| Answer» A. periodic cleaning | |
| 11. |
The length of rectangular sedimentation tank should not be more than |
| A. | twice |
| B. | three times |
| C. | four times |
| D. | six times |
| Answer» C. four times | |
| 12. |
The most commonly used chemical for dechlorination of water is |
| A. | sodium thiosulphate |
| B. | sodium sulphite |
| C. | potassium permaganate |
| D. | all of these |
| Answer» D. all of these | |
| 13. |
The discharge from washing places is called sullage. |
| A. | True |
| B. | False |
| Answer» A. True | |
| 14. |
The portion of soil through which lateral movement of water takes place is called |
| A. | water tablean aquiclude |
| B. | an aquiclude |
| C. | zone of saturation |
| D. | none of these |
| Answer» C. zone of saturation | |
| 15. |
A septic tank is a |
| A. | sedimentation tank |
| B. | digestion tank |
| C. | combination of sedimentation and digestion tank |
| D. | aeration tank |
| Answer» C. combination of sedimentation and digestion tank | |
| 16. |
Under steady low heads |
| A. | reciprocating |
| B. | centrifugal |
| Answer» B. centrifugal | |
| 17. |
The maximum permissible total solid content in water for domestic purposes should not exceed |
| A. | 300 ppm |
| B. | 400 ppm |
| C. | 500 ppm |
| D. | 1000 ppm |
| Answer» C. 500 ppm | |
| 18. |
Cleaning of rapid sand filters is done by |
| A. | scraping the top layer of filter media |
| B. | back washing |
| C. | providing new sand layers |
| D. | all of these |
| Answer» B. back washing | |
| 19. |
The sand, used for filteration, should not loose weight more than |
| A. | 2.50% |
| B. | 5% |
| C. | 7.50% |
| D. | 10% |
| Answer» B. 5% | |
| 20. |
Bleaching powder is |
| A. | slaked lime |
| B. | chloride of lime |
| C. | hypo-chloride of lime |
| D. | hypo-chlorite of lime |
| Answer» D. hypo-chlorite of lime | |
| 21. |
The efficiency of sedimentation tank for a given discharge, can be increased by |
| A. | increasing the depth of tank |
| B. | decreasing the depth of tank |
| C. | increasing the surface area of tank |
| D. | decreasing the surface area of tank |
| Answer» C. increasing the surface area of tank | |
| 22. |
Absolute pure water is good for health. |
| A. | Right |
| B. | Wrong |
| Answer» B. Wrong | |
| 23. |
The most important source of water for public water supply is |
| A. | lake |
| B. | pond |
| C. | river |
| D. | sea |
| Answer» D. sea | |
| 24. |
The most common cause of acidity in water is |
| A. | hydrogen |
| B. | oxygen |
| C. | carbon dioxide |
| D. | all of these |
| Answer» C. carbon dioxide | |
| 25. |
Water is |
| A. | safe |
| B. | harmful |
| Answer» B. harmful | |
| 26. |
The temporary hardness due to calcium bicarbonates can be removed by |
| A. | boiling |
| B. | lime process |
| C. | lime-soda process |
| D. | zeolite process |
| Answer» A. boiling | |
| 27. |
Which of the following statement is correct? |
| A. | The pumping system is the best system of water distribution. |
| B. | A sluice valve prevents water to flow back in the opposite direction |
| C. | In a ring system, there is one main supply pipe. |
| D. | all of the above |
| Answer» C. In a ring system, there is one main supply pipe. | |
| 28. |
The minimum diameter of a manhole cover should be |
| A. | 25 m |
| B. | 50 cm |
| C. | 75 cm |
| D. | 100 cm |
| Answer» B. 50 cm | |
| 29. |
An egg-shaped cross-section of a sewer |
| A. | is economical than circular cross-section |
| B. | is more stable than circular cross-section |
| C. | provides self cleaning velocity in dry weather |
| D. | none of the above |
| Answer» C. provides self cleaning velocity in dry weather | |
| 30. |
Garbage is a |
| A. | dry waste |
| B. | semi-liquid waste |
| C. | liquid waste |
| D. | none of these |
| Answer» A. dry waste | |
| 31. |
The human excreta is a |
| A. | dry |
| B. | semi-liquid |
| C. | liquid |
| Answer» B. semi-liquid | |
| 32. |
The increase in population of a young and rapidly developing city is estimated by comparative method. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 33. |
The lime soda process of water softening |
| A. | requires less quantity of coagulant |
| B. | helps in kolling pathogenic bacterias |
| C. | is suitable for turbid and acidic water |
| D. | all of these |
| Answer» D. all of these | |
| 34. |
Odours and tastes may result due to the prsence of |
| A. | micro-organisms either dead or alive |
| B. | dissolved gases such as oxygen, carbon dioxide, methane etc. |
| C. | mineral substances such as sodium chloride, iron compounds etc. |
| D. | all of the above |
| Answer» D. all of the above | |
| 35. |
The lower portion of a manhole is is known as |
| A. | access shaft |
| B. | base |
| C. | working chamber |
| D. | cover |
| Answer» C. working chamber | |
| 36. |
Which of the following statement is wrong? |
| A. | The water carriage system is more hygienic. |
| B. | There is no smell or sight nuisance in the case of water carriage system. |
| C. | The sewers in the water carriage system being all underground do not impair the beauty of the place |
| D. | The initial cost of construction of water carriage system is very low. |
| Answer» D. The initial cost of construction of water carriage system is very low. | |
| 37. |
Land disposal of sewage will be favourable where |
| A. | the rivers run dry or have a small flow during summer |
| B. | rainfall is very high |
| C. | climate is wet and rates of evaporation is low |
| D. | all of the above |
| Answer» A. the rivers run dry or have a small flow during summer | |
| 38. |
The amount of residual chlorine in treated water is determined by the |
| A. | Orthotolodine test |
| B. | Iodemetric test |
| C. | Amperometric test |
| D. | all of these |
| Answer» D. all of these | |
| 39. |
When in the pervious strata, the surface of water surrounding the well is at atmospheric pressure, the well is known as |
| A. | gravity well |
| B. | artesian well |
| C. | open well |
| D. | deep well |
| Answer» A. gravity well | |
| 40. |
The natural outflow of sub-surface water at the surface is termed as spring. |
| A. | Correct |
| B. | Incorrect |
| Answer» A. Correct | |
| 41. |
When turbidity of water exceeds about 45 ppm, coagulation |
| A. | should be |
| B. | should not be |
| Answer» A. should be | |
| 42. |
Manholes are, generally, located |
| A. | at all changes of direction |
| B. | at all changes of gradient |
| C. | at all junctions of main and branch sewers |
| D. | all of these |
| Answer» D. all of these | |
| 43. |
The bacteria which require oxygen for their survival is known as |
| A. | anaerobic bacteria |
| B. | pathogenic bacteria |
| C. | aerobic bacteria |
| D. | non-pathogenic bacteria |
| Answer» C. aerobic bacteria | |
| 44. |
The turbidity in water is caused due to |
| A. | silt |
| B. | clay |
| C. | finely divided organic matter |
| D. | all of these |
| Answer» D. all of these | |
| 45. |
The process of removing excess chlorine from water is called |
| A. | plain chlorination |
| B. | post-chlorination |
| C. | dechlorination |
| D. | super-chlorination |
| Answer» C. dechlorination | |
| 46. |
The coefficient of uniformity for slow sand filters is |
| A. | 1.35 |
| B. | 1.55 |
| C. | 1.75 |
| D. | 2.05 |
| Answer» C. 1.75 | |
| 47. |
In a rapid sand filter, the filter head varies from |
| A. | 1 to 1.5 m |
| B. | 1.5 to 2 m |
| C. | 2 to 4 m |
| D. | 4 to 5 m |
| Answer» C. 2 to 4 m | |
| 48. |
For a city or town with roads of rectangular pattern, the type of layout used for the distribution of pipes is |
| A. | dead end system |
| B. | ring system |
| C. | radial system |
| D. | grid iron system |
| Answer» D. grid iron system | |
| 49. |
The type of joint to be used in pipes depends upon the |
| A. | material of pipe |
| B. | internal pressure |
| C. | conditions of support |
| D. | all of these |
| Answer» D. all of these | |
| 50. |
Grit chambers are used to remove sand and other organic matter from sewage. |
| A. | Agree |
| B. | Disagree |
| Answer» A. Agree | |
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