TasDia Network
TasDia Network

MCQs 1: The chemical most commonly used to increase speed of sedimentation of sewage is_______________?

sulphuric acid copper sulphate lime sodium permanganate
Answer Explanation

MCQs 2: The detention period in coagulation tanks is usually kept as_______________?

1 to 2 minutes 30 to 45 minutes 2 to 6 hours 2 to 6 days
Answer Explanation

MCQs 3: The amount of coagulant needed for coagulation of water increases with_______________?
1) increase in turbidity of water
2) decrease in turbidity of water
3) increase in temperature of water
4) decrease in temperature of water
The correct answer is?

(1) and (2) (1)and (4) (2) and (3) (2) and (4)
Answer Explanation

MCQs 4: For a given discharge, the efficiency of sedimentation tank can be increased by______________?

increasing the depth of tank decreasing the depth of tank increasing the surface area of tank decreasing the surface area of tank
Answer Explanation

MCQs 5: The settling velocity of a particle in a sedimentation tank depends on__________________?

depth of tank surface area of tank both depth and surface area of tank none of the above
Answer Explanation

MCQs 6: The overflow rate for plain sedimentation tanks is about__________________?

500 to 750 litres/hour/ m2 1000 to 1250 litres/hour/ m2 1250 to 1500 litres/hour/m2 1500 to 2000 litres/hour/m2
Answer Explanation

MCQs 7: The settling velocity of a particle in a sedimentation tank increases if_________________?

particle size is decreased the surface area of tank is increased the depth of tank is decreased none of the above
Answer Explanation

MCQs 8: The velocity of flow of water in a sedimentation tank is about__________________?

5 to 10 cm/sec. 15 to 30 cm/sec. 15 to 30 cm/minute 15 to 30 cm/hour
Answer Explanation

MCQs 9: The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about______________?

0.01 to 0.05 ppm 0.05 to 0.5 ppm 0.5 to 1.0 ppm 1.0 to 5.0 ppm
Answer Explanation

MCQs 10: Orthotolidine test is used for determination of________________?

dissolved oxygen residual chlorine biochemical oxygen demand dose of coagulant
Answer Explanation

MCQs 11: On standard silica scale, the turbidity in drinking water should be limited to_______________?

10 ppm 20 ppm 30 ppm 50 ppm
Answer Explanation

MCQs 12: Which of the following values of pH represents a stronger acid?

2 5 7 10
Answer Explanation

MCQs 13: Standard EDTA (ethylene diamine tetra acetic aciD. solution is used to determine the_______________?

hardness in water turbidity in water dissolved oxygen in water residual chlorine in water
Answer Explanation

MCQs 14: Ground water is usually free from________________?

suspended impurities dissolved impurities both suspended and dissolved impuri¬ties none of the above
Answer Explanation

MCQs 15: The maximum discharge of a tube-well is about_________________?

5 litres/sec 50 litres/sec 500 litres/sec 1000 litres/see
Answer Explanation

MCQs 16: The phenolic compounds in public water supply should not be more than_______________?

0.1 ppm 0.01 ppm 0.001 ppm 0.0001 ppm
Answer Explanation

MCQs 17: Which of the following is not a water borne disease ?

dysentery cholera typhoid maleria
Answer Explanation

MCQs 18: Select the correct relationship between porosity (N), specific yield (y) and specific retention (R)________________?

N = y + R y = N + R R = N + y R > (N + y)
Answer Explanation

MCQs 19: The suitable method of forecasting popu¬lation for a young and rapidly increasing city is_________________?

arithmetical increase method geometrical increase method incremental increase method graphical method
Answer Explanation

MCQs 20: As compared to geometrical increase method of forecasting population, arithmetical increase method gives________________?

lesser value higher value same value accurate value
Answer Explanation

MCQs 21: If the average daily consumption of a city is 100,000 m3, the maximum daily con¬sumption on peak hourly demand will be_______________?

100000m3 150000m3 180000m3 270000 m3
Answer Explanation

MCQs 22: Which of the following causes a decrease in per capita consumption ?

use of metering system good quality of water better standard of living of the people hotter climate
Answer Explanation

MCQs 23: Assertion A : The consumption of water increases with increase in the distribution pressure. Reason R : Higher distribution pressure causes more loss and waste of water. Select your answer according to the coding system given below?

Both A and R are true and R is the correct explanation of A Both A and R are true but R is not the correct explanation of A A is true but R is false A is false but R is true
Answer Explanation

MCQs 24: The per capital consumption of a locality is affected by_________________?
1) climatic conditions
2) quality of water
3) distribution pressure
The correct answer is?

only (1) both (1) and (2) both (1) and (3) all (1), (2) and (3)
Answer Explanation

MCQs 25: The devices which are installed for drawing water from the sources are called______________?

aquifers aquiclude filters intakes
Answer Explanation

MCQs 26: If the coliform bacteria is present in a sample of water, then the coliform test to be conducted is_____________?
1) presumptive coliform test
2) confirmed coliform test
3) completed coliform test
The correct answer is ?

only (1) both (1) and (2) both (1) and (3) all (1), (2) and (3)
Answer Explanation

MCQs 27: Select the correct statement__.?

5 day BOD is the ultimate BOD 5 day BOD is greater than 4 day BOD keeping other conditions same 5 day BOD is less than 4 day BOD keeping other conditions same BOD does nof depend on time
Answer Explanation

Related Topics

About Us | Contact Us | Privacy Policy
ABOUT US
Category
Who We Are

TasDia Network, this platform not only provides you the best educational stuff but besides this, we are creating thousands of new ideas to making your signature and planning much more on a single platform.

© 2020-2023, TasDia Network

All rights of the publication are reserved by tasdia.com.