Home» Online Test » Civil Engineering » Water Supply & Sanitation Engineering Online Test » Paper 1 » Paper 2 » Paper 3 0% Sorry, time's up. To complete the online test, please restart it. Created by Vikash chaudhary This is a FREE online test. Beware of scammers who ask for money to attend this test. Get fresh, new questions in each attempt. Total Questions: 30 Time Allotted: 30 minutes Passing Score: 50% Randomization: Yes Certificate: No Do not refresh the page! 👍 All the best! 1 / 30 1. The design discharge for the separate sewer system is taken equal to: a) dry weather flow b) 2x dry weather flow c) 4x dry weather flow d) 6x dry weather flow 2 / 30 2. The water supply demand in a day school without a boarder should be a) 10 lpcd b) 20 lpcd c) 30 lpcd d) 40 lpcd 3 / 30 3. The pump does not require any power, energy, fuel, etc., for its working is a) centrifugal b) hydraulic ram c) reciprocating d) rotary 4 / 30 4. The velocity of water in water mains of 40 cm diameter is usually kept a) below 0.5 m/sec b) below 5 m/sec c) below 1.8 m/sec d) below 18 m/sec 5 / 30 5. Dengue is termed as which type of disease? a) Waterborne b) Water washed c) Water based d) Water related 6 / 30 6. The gradient of a sewer is: a) given in the direction of the natural slope of the ground b) given in the opposite direction of the natural slope of the ground c) zero d) more than 1 in 20 7 / 30 7. The colour of water is measured on the platinum cobalt scale with the help of a) thermometer b) tintometer c) turbidity meter d) barometer 8 / 30 8. Garbage dumping home is: a) places where garbage is kept b) places where garbage is disposed c) places where garbage is treated d) all of the above 9 / 30 9. A structure constructed to remove obstacles in the sewer is known as: a) catch basin b) well holes c) clean outs d) flushing tanks 10 / 30 10. Self-purification of natural streams is caused due to a) dilution b) oxygen reduction c) sunlight d) all of the above 11 / 30 11. When the fall in elevation is greater than 60cm, the manhole provided is called: a) lamp hole b) flight manhole c) drop manhole d) fall manhole 12 / 30 12. If in the relative stability test on sewage, the period of incubation at 20°C is 15 days, the relative stability is: a) 95.95% b) 96.05% c) 96.86% d) 100% 13 / 30 13. The depression of the water table in a well due to pumping will be maximum a) at a distance r from the well b) at a distance r/2 from the well c) close to the well d) none of the above 14 / 30 14. Before entering a manhole, a candle is lowered into the manhole: a) to illuminate it b) to detect toxic gases c) to give a signal to the adjacent manhole d) to find out the presence of oxygen 15 / 30 15. In a circular sewer if depth of flow is 0.2 times the full depth, the nominal gradient: a) is only provided b) is doubled c) three d) none of the above 16 / 30 16. Computation of discharges is difficult for: a) dead-end system b) grid iron system c) ring system d) radial system 17 / 30 17. Following material is used during drilling to prevent caving a) bentonite b) thixotropy c) both (a) and (b) above d) none of the above 18 / 30 18. Most suitable section, when the maximum and minimum flow ratio is not much, is: a) circular section b) rectangular section c) horse-shoe section d) egg-shaped section 19 / 30 19. If Q is discharge in cubic meters per second and D is the economical diameter of the pipe, then according to Lea a) D = 0.67 to 0.87 √Q b) D = 0.67 to 0.97 √Q c) D = 0.97 to 1.22 √Q d) D = 1.22 to 1.32 √Q 20 / 30 20. An egg-shaped section of sewer: a) is economical than a circular section b) is more stable than a circular section c) provides self-cleansing velocity at low discharge d) all of the above 21 / 30 21. The highest non-scouring velocity in a sewer may be allowed in: a) cast iron sewer b) glazed brick sewer c) cement concrete d) stone ware sewer 22 / 30 22. The pipe used to carry discharge from sanitary fittings like bathrooms, kitchens, etc., is: a) waste pipe b) soil pipe c) vent pipe d) anti-siphonage pipe 23 / 30 23. The design discharge for the combined system shall be taken equal to: a) rainfall b) rainfall + dry weather flow c) rainfall + 2× dry weather flow d) rainfall + 4× dry weather flow 24 / 30 24. Thrash rack/roughing filter is provided at the entrance of a) intake b) slow sand filter c) rapid sand filter d) all of the above 25 / 30 25. The maximum diameter of a sewer pipe should preferably be: a) 100 cm b) 200 cm c) 300 cm d) 450 cm 26 / 30 26. Grit is: a) inert matter of specific gravity > 2.65 b) organic matter of specific gravity nearer to 1 c) organic and inert matter combined d) colloidal matter of heavy specific gravity 27 / 30 27. Imhoff tank is a: a) one-storey sedimentation tank b) two-storey sedimentation tank c) three-storey sedimentation tank d) four-storey sedimentation tank 28 / 30 28. Advantage of pressure conduits is a) flow is independent of the grade of the hydraulic grade line b) economical since it follows a shorter path c) less chance of water pollution as it is closed d) all of the above 29 / 30 29. A septic tank is a watertight tank where the following operation(s) take place: a) sedimentation b) sedimentation + digestion (anaerobic) c) digestion (aerobic) d) decomposition of organic and inorganic matter by bacteria 30 / 30 30. Total quantity of reservoir is the sum of the following a) breakdown reserve b) fire reserve c) all of the above d) balancing reserve Please provide accurate information so we can send your Achievement Certificate by mail. NameEmailPhone Number Your score is Share your achievement! LinkedIn Facebook Twitter 0% Restart Test Please provide your feedback. Thank you for your valuable feedback. Send feedback Buy Water Supply & Sanitation Engineering MCQ PDF for Offline Study