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MCQs

Total Questions : 828 | Page 77 of 83 pages
Question 761. Corrosion in concrete sewers is caused by______________?
  1.    septic conditions
  2.    dissolved oxygen
  3.    chlorine
  4.    nitrogen
 Discuss Question
Answer: Option A. -> septic conditions
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 762. Dissolved oxygen in streams is______________?
  1.    maximum at noon
  2.    minimum at noon
  3.    maximum at midnight
  4.    same throughout the day
 Discuss Question
Answer: Option A. -> maximum at noon
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 763. The ratio of 5 day BOD to ultimate BOD is about_______________?
  1.    1/3
  2.    2/3
  3.    3/4
  4.    1.0
 Discuss Question
Answer: Option B. -> 2/3
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 764. The minimum dissolved oxygen which should always be present in water in order to save the aquatic life is______________?
  1.    1 ppm
  2.    4 ppm
  3.    10 ppm
  4.    40 ppm
 Discuss Question
Answer: Option B. -> 4 ppm
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 765. The means of access for inspection and cleaning of sewer line is known as_______________?
  1.    inlet
  2.    manhole
  3.    drop manhole
  4.    catch basin
 Discuss Question
Answer: Option B. -> manhole
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 766. An egg shaped section of sewer________________?
  1.    is economical than circular section
  2.    provides self cleansing velocity at low discharges
  3.    is more stable than circular section
  4.    is easy to construct
 Discuss Question
Answer: Option B. -> provides self cleansing velocity at low discharges
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 767. The characteristics of fresh and septic sewage respectively are____________________?
  1.    acidic and alkaline
  2.    alkaline and acidic
  3.    both acidic
  4.    both alkaline
 Discuss Question
Answer: Option B. -> alkaline and acidic
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 768. The correct relation between theoretical oxygen demand (TOD), Biochemical oxygen demand (BOD) and Chemical oxygen demand (COD) is given by_______________?
  1.    TOD>BOD>COD
  2.    TOD>COD>BOD
  3.    BOD>COD>TOD
  4.    COD>BOD>TOD
 Discuss Question
Answer: Option B. -> TOD>COD>BOD
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 769. Settling velocity increases with_______________?
  1.    specific gravity of solid particles
  2.    size of particles
  3.    depth of tank
  4.    temperature of liquid
 Discuss Question
Answer: Option C. -> depth of tank
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 770. Which of the following retards the self purification of stream ?
  1.    higher temperature
  2.    sunlight
  3.    satisfying oxygen demand
  4.    none of the above
 Discuss Question
Answer: Option D. -> none of the above
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

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