Environmental Engineering MCQs

1.Which of the following statements about BOD (Biochemical Oxygen Demand) is accurate?

The 5-day BOD represents the total or ultimate BOD.Under identical conditions, the 5-day BOD value exceeds the 4-day BOD.Given the same conditions, the 5-day BOD is lower than the 4-day BOD.BOD values are independent of the duration of measurement.None of the above statements are correct.

2.When coliform bacteria are detected in a water sample, which coliform tests should be performed?

Only the presumptive coliform test (1)Both the presumptive (1) and confirmed (2) coliform testsBoth the presumptive (1) and completed (3) coliform testsAll three tests: presumptive (1), confirmed (2), and completed (3)None of the above

3.What is the term for the equipment used to extract water from its sources?

4.Which factors influence the per capita consumption in a given area?

Only factor (1)Factors (1) and (2) combinedFactors (1) and (3) combinedFactors (1), (2), and (3) all together

5.Assertion (A): Water usage rises as the distribution pressure increases. Reason (R): Elevated distribution pressure leads to greater water loss and wastage. Choose the correct option based on the given coding scheme.

Both A and R are correct, and R properly explains ABoth A and R are correct, but R does not explain AA is correct, but R is incorrectA is incorrect, but R is correctNone of the above

6.Which factor leads to a reduction in per capita water consumption?

Implementation of a metering systemHigh-quality water supplyImproved living standardsWarmer climatic conditions

7.Given that a city’s average daily water usage is 100,000 m³, what is the maximum daily consumption expected during the peak hourly demand?

8.In population forecasting, how does the arithmetical increase method's estimate generally compare to that of the geometrical increase method?

A lower estimateA greater estimateAn identical estimateA more precise estimate

9.Which forecasting technique is most appropriate for estimating the population of a rapidly growing and youthful city?

Method based on constant numerical growthMethod based on exponential growthMethod based on incremental changesVisual representation methodNone of the above

10.Identify the accurate equation that relates porosity (N), specific yield (y), and specific retention (R).

N equals the sum of y and Ry is the sum of N and RR is the sum of N and yR is greater than the sum of N and y

11.Identify the disease from the list below that is not transmitted through contaminated water.

DysenteryCholeraTyphoid feverMalaria

12.What is the maximum allowable concentration of phenolic compounds in public drinking water?

0.1 parts per million0.01 parts per million0.001 parts per million0.0001 parts per million

13.What is the typical maximum flow rate achievable from a tube well?

5 liters per second50 liters per second500 liters per second1000 liters per second

14.Which type of impurities is groundwater generally free of?

Particles suspended in waterImpurities dissolved in waterBoth suspended and dissolved impuritiesNone of the listed options

15.What is the primary purpose of using a standard EDTA (ethylene diamine tetraacetic acid) solution in water analysis?

To measure the hardness of waterTo assess the cloudiness of waterTo determine the amount of dissolved oxygen in waterTo detect the remaining chlorine in water

16.Among the following pH levels, which indicates the most acidic solution?

17.According to the standard silica scale, what is the maximum acceptable turbidity level in drinking water?

18.The Orthotolidine test is primarily employed to measure which of the following?

Oxygen dissolved in waterRemaining chlorine contentBiochemical oxygen demand levelsAmount of coagulant applied

19.What is the typical concentration range of residual chlorine maintained in public water supplies to ensure protection against harmful bacteria?

20.What is the typical flow velocity of water in a sedimentation basin?

Between 5 and 10 centimeters per secondFrom 15 to 30 centimeters per secondApproximately 15 to 30 centimeters per minuteAround 15 to 30 centimeters per hour