1) For estimating the peak run off the rational formula Q = 0.0278 KpA was evolved by______________? a. Kinchling b. Lloyd Davis c. Frubling d. All the above
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2) The settlement velocity of a solid (diameter 0.5 mm, specific gravity 1.75) in water having temperature 10°C, is______________________? a. 213.5 cm/sec b. 313.5 cm/sec c. 413.5 cm/sec d. 500 cm/sec
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3) The laying of sewers is done with____________________? a. Magnetic compass b. Theodolite c. Level d. Clinometer
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4) For detecting the nitrites in the sewage, the matching colour may be developed by adding_________________? a. Potassium permanganate b. Sulphuric acid and napthamine c. Phenol-di -sulphuric acid potassium hydroxide d. None of these
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5) Fresh sewage is generally_____________________? a. Alkaline b. Acidic c. Highly decomposed d. A source of objectionable odour
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6) It is customary to design a sewer for D.W.F. on the basis of________________? a. Average demand b. Twice the average demand c. Thrice the average demand d. Four times the average demand
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7) The following is the physical characteristic of sewage___________________? a. Turbidity b. Colour c. Odour d. All the above
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8) For laying a sewer line in a trench of 2 m width, an offset line is marked on the ground parallel to the given centre line at a distance of___________________? a. 100 cm b. 120 cm c. 140 cm d. 160 cm
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9) The most dangerous pollutant in vehicular emissions is____________________? a. CO b. SO2 c. CO2 d. O3
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10) The sewer which collects the discharge from a collecting system and delivers it to a treatment plant, is known_____________________? a. House sewer b. Lateral sewer c. Branch sewer d. Sewer outfall
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11) A sewer pipe contains 1 mm sand particles of specific gravity 2.65 and 5 mm organic particles of specific gravity 1.2, the minimum velocity required for removing the sewerage, is_____________________? a. 0.30 m/sec b. 0.35 m/sec c. 0.40 m/sec d. 0.45 m/sec
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12) The settlement of a particle in sedimentation tank, is affected by_____________________? a. Velocity of flow b. Viscosity of water c. Size and shape of solid d. All the above
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13) If the over land flow from the critical point to the drain is 8 km and the difference in level is 12.4 m, the inlet time is________________? a. 2 hours b. 3 hours c. 4 hours d. 5 hours
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14) The minimum recommended diameter of sewers, is_________________? a. 5 cm b. 10 cm c. 15 cm d. 20 cm
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15) The suitable cross-section of sewers to carry combined flow, is__________________? a. Circular b. Egg shaped c. Rectangular d. Horse shoe shaped
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16) In sewers the highest non-scouring velocity is achieved in________________? a. Glazed bricks sewers b. Cast iron sewers c. Cement concrete sewers d. Stone ware sewers
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17) If D.O. concentration falls down to zero in any natural drainage, it indicates the zone of__________________? a. Degradation b. Active decomposition c. Recovery d. Cleaner water
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18) For trunk and out-fall, the type of sewers generally used, is_____________________? a. Standard egg shaped b. Circular shaped c. Horse shoe shaped d. Parabolic shaped
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19) The most efficient cross section of sewers in a separate sewerage system is__________________? a. Parabolic b. Circular c. Rectangular d. New egged
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20) The stone ware sewers_________________? a. Are used for carrying sewage and drainage from houses b. Are manufactured from clays and shale c. After casting are dried and burnt at temperature 150°C, 700°C and 1200°C d. All the above
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