MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 167 Mcqs, each offering curated multiple-choice questions to sharpen your Civil Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
*/*_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 | |
| 52. |
*/*_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 | |
| 53. |
*/*_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 | |
| 54. |
_ The detention period and overflow rate respectively for plain sedimentation as compared to sedimentation with coagulation are generally$? |
| A. | Less and more |
| B. | Less and less |
| C. | More and less |
| D. | More and more |
| Answer» D. More and more | |
| 55. |
_ Chlorine demand of water is equal to$? |
| A. | Applied chlorine |
| B. | Residual chlorine |
| C. | Sum of applied and residual chlorine |
| D. | Difference of applied and residual chlorine |
| Answer» E. | |
| 56. |
_ The working conditions in imhoff tanks are$? |
| A. | Aerobic only |
| B. | Anaerobic only |
| C. | Aerobic in lower compartment and anaerobic in upper compartment |
| D. | Anaerobic in lower compartment and aerobic in upper compartment |
| Answer» E. | |
| 57. |
_ For satisfactory working of a sludge digestion unit, the pH range of digested sludge should be maintained as$? |
| 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 | |
| 58. |
_ The polluted water is one which$? |
| A. | Contains pathogenic bacteria |
| B. | Consists of undesirable substances rendering it unfit for drinking and domestic use |
| C. | Is safe and suitable for drinking and domestic use |
| D. | Is contaminated |
| Answer» C. Is safe and suitable for drinking and domestic use | |
| 59. |
_ The amount of coagulant needed for coagulation of water increases with (i) Increase in turbidity of water (ii) Decrease in turbidity of water (iii) Increase in temperature of water (iv) Decrease in temperature of waterThe correct answer is$? |
| A. | (i) and (ii) |
| B. | (i)and(iv) |
| C. | (ii) and (iii) |
| D. | (ii) and (iv) |
| Answer» C. (ii) and (iii) | |
| 60. |
_ In water treatment, rapid gravity filters are adopted to remove$? |
| A. | Dissolved organic substances |
| B. | Dissolved solids and dissolved gases |
| C. | Floating solids and dissolved inorganic solids |
| D. | Bacteria and colloidal solids |
| Answer» E. | |
| 61. |
_ The biochemical treatment of sewage effluents is essentially a process of$? |
| A. | Oxidation |
| B. | Dehydration |
| C. | Reduction |
| D. | Alkalinization |
| Answer» B. Dehydration | |
| 62. |
_ Most suitable section of sewer in separate sewage system is$? |
| A. | Rectangular section |
| B. | Circular section |
| C. | Standard form of egg shaped sewer |
| D. | Modified egg shaped section |
| Answer» C. Standard form of egg shaped sewer | |
| 63. |
_ If the total hardness of water is greater than its total alkalinity, the carbonate hardness will be equal to$? |
| A. | Total alkalinity |
| B. | Total hardness |
| C. | Total hardness total alkalinity |
| D. | Non carbonate hardness |
| Answer» B. Total hardness | |
| 64. |
_ The minimum dissolved oxygen which should always be present in water in order to save the aquatic life is$? |
| A. | 1 ppm |
| B. | 4 ppm |
| C. | 10 ppm |
| D. | 40 ppm |
| Answer» C. 10 ppm | |
| 65. |
_ Septic tank is a (i) Settling tank (ii) Digestion tank (iii) Aeration tank$? |
| A. | Only (i) |
| B. | (i) and (ii) |
| C. | (i) and (iii) |
| D. | Only (iii) |
| Answer» C. (i) and (iii) | |
| 66. |
_ Dissolved oxygen in streams is$? |
| A. | Maximum at noon |
| B. | Minimum at noon |
| C. | Maximum at midnight |
| D. | Same throughout the day |
| Answer» B. Minimum at noon | |
| 67. |
_ A pipe which is installed in the house drainage to preserve the water seal of traps is called$? |
| A. | Vent pipe |
| B. | Anti-siphonage pipe |
| C. | Waste pipe |
| D. | Soil pipe |
| Answer» C. Waste pipe | |
| 68. |
_ Percentage of bacterial load that can be removed from water by the process of plain sedimentation is about$? |
| A. | 10 to 25 |
| B. | 50 |
| C. | 75 |
| D. | 100 |
| Answer» D. 100 | |
| 69. |
_ The phenolic compounds in public water supply should not be more than$? |
| A. | 0.1 ppm |
| B. | 0.01 ppm |
| C. | 0.001 ppm |
| D. | 0.0001 ppm |
| Answer» D. 0.0001 ppm | |
| 70. |
__A pipe conveying sewage from plumbing system of a single building to common sewer or point of immediate disposal is called__ |
| A. | House sewer |
| B. | Lateral sewer |
| C. | Main sewer |
| D. | Sub-main sewer |
| Answer» B. Lateral sewer | |
| 71. |
__Ground water is usually free from__ |
| A. | Suspended impurities |
| B. | Dissolved impurities |
| C. | Both suspended and dissolved impurities |
| D. | None of the above |
| Answer» B. Dissolved impurities | |
| 72. |
__Turbidity is measured on__ |
| A. | Standard silica scale |
| B. | Standard cobalt scale |
| C. | Standard platinum scale |
| D. | Platinum cobalt scale |
| Answer» B. Standard cobalt scale | |
| 73. |
__Air binding phenomena in rapid sand filters occur due to__ |
| A. | Excessive negative head |
| B. | Mud ball formation |
| C. | Higher turbidity in the effluent |
| D. | Low temperature |
| Answer» B. Mud ball formation | |
| 74. |
__Which of the following methods of analysis of water distribution system is most suitable for long and narrow pipe system?__ |
| A. | Circle method |
| B. | Equivalent pipe method |
| C. | Hardy cross method |
| D. | Electrical analysis method |
| Answer» C. Hardy cross method | |
| 75. |
__For a given discharge, the efficiency of sedimentation tank 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» D. Decreasing the surface area of tank | |
| 76. |
__If the average daily consumption of a city is 100,000 m³, the maximum daily consumption on peak hourly demand will be__ |
| A. | 100000 m³ |
| B. | 150000 m³ |
| C. | 180000 m³ |
| D. | 270000 m³ |
| Answer» E. | |
| 77. |
__The alum, when added as a coagulant in water__ |
| A. | Does not require alkalinity in water for flocculation |
| B. | Does not affect pH value of water |
| C. | Increases pH value of water |
| D. | Decreases pH value of water |
| Answer» E. | |
| 78. |
__The suitable layout of distribution system for a city with roads of rectangular pattern is__ |
| A. | Grid iron system |
| B. | Dead end system |
| C. | Ring system |
| D. | Radial system |
| Answer» B. Dead end system | |
| 79. |
__As compared to higher pH values, the contact period required for efficient chlorination at lower pH values is__ |
| A. | Smaller |
| B. | Larger |
| C. | Same |
| D. | None of the above |
| Answer» B. Larger | |
| 80. |
__The main disadvantage of cement concrete sewers is__ |
| A. | Less strength |
| B. | Difficulty in construction |
| C. | Difficulty in transportation due to heavy weight |
| D. | Less life |
| Answer» D. Less life | |
| 81. |
__Composting and lagooning are the methods of__ |
| A. | Sludge digestion |
| B. | Sludge disposal |
| C. | Sedimentation |
| D. | Filtration |
| Answer» C. Sedimentation | |
| 82. |
_The suitable method for disinfection of swimming pool water is$? |
| A. | Ultra violet rays treatment |
| B. | Lime treatment |
| C. | By using potassium permanganate |
| D. | Chlorination |
| Answer» B. Lime treatment | |
| 83. |
_The effective size of sand particles used in slow sand filters is$? |
| A. | 0.25 to 0.35 mm |
| B. | 0.35 to 0.60 mm |
| C. | 0.60 to 1.00 mm |
| D. | 1.00 to 1.80 mm |
| Answer» B. 0.35 to 0.60 mm | |
| 84. |
The rate of filtration in slow sand filters in million litres per day per hectare is about$? |
| A. | 50 to 60 |
| B. | 100 to 150 |
| C. | 500 to 600 |
| D. | 1400 to 1500 |
| Answer» B. 100 to 150 | |
| 85. |
Sewage treatment units are designed for$? |
| A. | Maximum flow only |
| B. | Minimum flow only |
| C. | Average flow only |
| D. | Maximum and minimum flow |
| Answer» D. Maximum and minimum flow | |
| 86. |
Activated carbon is used for$? |
| A. | Disinfection |
| B. | Removing hardness |
| C. | Removing odours |
| D. | Removing corrosiveness |
| Answer» D. Removing corrosiveness | |
| 87. |
As compared to rapid sand filters, slow sand filters give (i) Slower filtration rate (ii) Higher filtration rate (iii) Lesser efficiency in removal of bacteria (iv) Higher efficiency in removal of bacteria The correct answer is$? |
| A. | (i) and (ii) |
| B. | (ii) and (iii) |
| C. | (i) and (iv) |
| D. | (ii) and (iv) |
| Answer» D. (ii) and (iv) | |
| 88. |
As compared to cast iron pipes, steel pipes are$? |
| A. | Heavier |
| B. | Stronger |
| C. | Costlier |
| D. | Less susceptible to corrosion |
| Answer» C. Costlier | |
| 89. |
The minimum and maximum diameters of sewers shall preferably be$? |
| A. | 15 cm and 100 cm |
| B. | 15 cm and 300 cm |
| C. | 30 cm and 450 cm |
| D. | 60 cm and 300 cm |
| Answer» C. 30 cm and 450 cm | |
| 90. |
An egg shaped section of sewer$? |
| A. | Is economical than circular section |
| B. | Provides self cleansing velocity at low discharges |
| C. | Is more stable than circular section |
| D. | Is easy to construct |
| Answer» C. Is more stable than circular section | |
| 91. |
Disinfection of water results in$? |
| A. | Removal of turbidity |
| B. | Removal of hardness |
| C. | Killing of disease bacteria |
| D. | Complete sterilisation |
| Answer» D. Complete sterilisation | |
| 92. |
Facultative bacteria are able to work in$? |
| A. | Presence of oxygen only |
| B. | Absence of oxygen only |
| C. | Presence as well as in absence of oxygen |
| D. | Presence of water |
| Answer» D. Presence of water | |
| 93. |
The length of rectangular sedimentation tank should not be more than(Where ‘B’ is the width of the tank)$? |
| A. | B |
| B. | 2B |
| C. | 4B |
| D. | 8B |
| Answer» D. 8B | |
| 94. |
For a country like India, where rainfall is mainly confined to one season, the suitable sewerage system will be$? |
| A. | Separate system |
| B. | Combined system |
| C. | Partially combined system |
| D. | Partially separate system |
| Answer» B. Combined system | |
| 95. |
The rate of Alteration of pressure filters is$? |
| 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 | |
| 96. |
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$? |
| A. | Only (i) |
| B. | Both (i) and (ii) |
| C. | Both (i) and (iii) |
| D. | All (i), (ii) and (iii) |
| Answer» E. | |
| 97. |
The means of access for inspection and cleaning of sewer line is known as$? |
| A. | Inlet |
| B. | Manhole |
| C. | Drop manhole |
| D. | Catch basin |
| Answer» C. Drop manhole | |
| 98. |
Hardy cross method of analysis of distribution system (i) Involves successive trials (ii) Takes economic aspects into account (iii) Is time consuming$? |
| A. | Only (i) |
| B. | (i) and (ii) |
| C. | (i) and (iii) |
| D. | All are correct |
| Answer» D. All are correct | |
| 99. |
The most commonly used sewer under culverts is$? |
| A. | Circular brick sewer |
| B. | Circular cast iron sewer |
| C. | Semi-elliptical sewer |
| D. | Horseshoe type sewer |
| Answer» B. Circular cast iron sewer | |
| 100. |
Settling velocity increases with$? |
| A. | Specific gravity of solid particles |
| B. | Size of particles |
| C. | Depth of tank |
| D. | Temperature of liquid |
| Answer» D. Temperature of liquid | |