Civil engineering Environmental Questions – Set 06

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Q1. Sewage treatment units are normally designed for

(A) 5 – 10 years
(B) 15 – 20 years
(C) 30 – 40 years
(D) 40 – 50 years

Answer: (B) 15 – 20 years

Q2. 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: (B) Egg shaped sewer

Q3. Laying of sewers is usually done with the help of

(A) A Theodolite
(B) A compass
(C) Sight rails and boning rods
(D) A plane table

Answer: (C) Sight rails and boning rods

Q4. 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: (B) Manhole

Q5. In a BOD test, 1.0 ml of raw sewage was diluted to 100 ml and the dissolved oxygen concentration of diluted sample at the beginning was 6 ppm and it was 4 ppm at the end of 5 day incubation at 20°C. The BOD of raw sewage will be

(A) 100 ppm
(B) 200 ppm
(C) 300 ppm
(D) 400 ppm

Answer: (B) 200 ppm

Q6. 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: (C) 150 to 350

Q7. The maximum efficiency of BOD removal is achieved in

(A) Oxidation pond
(B) Oxidation ditch
(C) Aerated lagoons
(D) Trickling filters

Answer: (B) Oxidation ditch

Q8. Corrosion in concrete sewers is caused by

(A) Septic conditions
(B) Dissolved oxygen
(C) Chlorine
(D) Nitrogen

Answer: (A) Septic conditions

Q9. 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: (D) 270000 m3

Q10. For the same solid content, if the quantity of sludge with moisture content of 98% is X, then the quantity of sludge with moisture content of 96% will be

(A) X/4
(B) X/2
(C) X
(D) 2X

Answer: (B) X/2

Q11. The main disadvantage of oxidation pond is that

(A) Large area is required for construction
(B) Maintenance and operation cost are high
(C) BOD removal is very low
(D) None of the above

Answer: (A) Large area is required for construction

Q12. The most common cause of acidity in water is

(A) Carbon dioxide
(B) Oxygen
(C) Hydrogen
(D) Nitrogen

Answer: (A) Carbon dioxide

Q13. The process of lagooning is primarily a means of

(A) Reducing the excessive flow in sewers
(B) Disposing of sludge
(C) Increasing the capacity of storage reservoirs
(D) Increasing flow of sewage through imhoff tanks

Answer: (B) Disposing of sludge

Q14. Most of the bacteria in sewage are

(A) Parasitic
(B) Saprophytic
(C) Pathogenic
(D) Anaerobic

Answer: (B) Saprophytic

Q15. The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about

(A) 0.01 to 0.05 ppm
(B) 0.05 to 0.5 ppm
(C) 0.5 to 1.0 ppm
(D) 1.0 to 5.0 ppm

Answer: (B) 0.05 to 0.5 ppm

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