MCQOPTIONS
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MCQOPTIONS
This section includes 50 Mcqs, each offering curated multiple-choice questions to sharpen your Environmental Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The type of wastewater from the flushing operation of toilet is __________ |
| A. | Green water |
| B. | Red water |
| C. | Black water |
| D. | Brown water |
| Answer» D. Brown water | |
| 2. |
The wastewater from the kitchen is an example of __________ |
| A. | Black water |
| B. | Yellow water |
| C. | Green water |
| D. | Grey water |
| Answer» E. | |
| 3. |
The odor quality of Amines is __________ |
| A. | Rotten egg |
| B. | Fishy |
| C. | Fecal matter |
| D. | Decayed cabbage |
| Answer» C. Fecal matter | |
| 4. |
______ represents the number of dilutions required to reduce odor. |
| A. | Dispersion |
| B. | Threshold odor number |
| C. | BOD |
| D. | COD |
| Answer» C. BOD | |
| 5. |
_______ indicates the freshness of sewage. |
| A. | Turbidity |
| B. | Color |
| C. | Temperature |
| D. | COD |
| Answer» C. Temperature | |
| 6. |
Identify the incorrect statement from the following? |
| A. | High odor intensity indicates odorless water |
| B. | Fresh sewage is odorless |
| C. | Turbidity can be measured by turbidity rod |
| D. | NTU is a unit of turbidity |
| Answer» B. Fresh sewage is odorless | |
| 7. |
In India, the average temperature of sewage is __________ |
| A. | 10oC |
| B. | 20oC |
| C. | 40oC |
| D. | 80oC |
| Answer» C. 40oC | |
| 8. |
The odor in wastewater is measured by __________ |
| A. | Osmoscope |
| B. | Chromatography |
| C. | Olfactometer |
| D. | Turbidity meter |
| Answer» B. Chromatography | |
| 9. |
The color of the septic sewage is __________ |
| A. | Pink |
| B. | Red |
| C. | Black |
| D. | Grey |
| Answer» D. Grey | |
| 10. |
When the sewage becomes stronger, the turbidity of wastewater? |
| A. | Increases |
| B. | Decreases |
| C. | Becomes constant |
| D. | Slightly decrease |
| Answer» B. Decreases | |
| 11. |
Which of the following is measured in mg/L? |
| A. | Unit weight |
| B. | Coefficient of cohesion |
| C. | Discharge |
| D. | Turbidity |
| Answer» E. | |
| 12. |
For a cinema hall the number of W.Cs required for females is _________. |
| A. | 2% upto 200 and 1% thereafter |
| B. | 2% |
| C. | 1% |
| D. | 1% upto 200 and 2% thereafter |
| Answer» B. 2% | |
| 13. |
In a sludge digestion tank, the gas that mainly evolves is |
| A. | Methane |
| B. | Hydrogen Sulphide |
| C. | Ammonia |
| D. | Nitrogen |
| Answer» B. Hydrogen Sulphide | |
| 14. |
If the sewer is to be designed for the non-scouring velocity of 5 m/sec, which among the following material would you recommend? |
| A. | Cast iron sewer |
| B. | Glazed brick sewer |
| C. | Stone ware sewer |
| D. | Cement concrete sewer |
| Answer» C. Stone ware sewer | |
| 15. |
For the survival of fish, the minimum level of Dissolved Oxygen (DO) necessary in the rivers and streams is |
| A. | 1 mg/L |
| B. | 2 mg/L |
| C. | 4 mg/L |
| D. | 8 mg/L |
| Answer» D. 8 mg/L | |
| 16. |
If B.O.D. of wastewater sample after 5 days incubation at 20ºC is 100 mg/l, deoxygenation rate constant at 20ºC is 0. 1 per day, ultimate B.O.D. will be |
| A. | 120.20 mg/l |
| B. | 146.25 mg/l |
| C. | 200.45 mg/l |
| D. | 225.60 mg/l |
| Answer» C. 200.45 mg/l | |
| 17. |
For controlling the growth of algae, the chemical generally used is: |
| A. | Alum |
| B. | Bleaching powder |
| C. | Lime |
| D. | Copper sulphate |
| Answer» E. | |
| 18. |
A water treatment plant has a flow rate of 0.6 m3/s. The settling basin at the plant has effective settling volume dimensions of length 20 m, depth 3 m, and width 6 m. What percentage of the particles having a settling velocity of 0.004 m/sec is removed? |
| A. | 80% |
| B. | 92% |
| C. | 75% |
| D. | 100% |
| Answer» B. 92% | |
| 19. |
In rate analysis, the unit of measurement Indian W.C. size 580 mm size is |
| A. | Kg |
| B. | Number |
| C. | Pair |
| D. | Sq.meter |
| Answer» C. Pair | |
| 20. |
Free settling of particles in the sedimentation process is also called: |
| A. | Compression settling |
| B. | Discrete settling |
| C. | Hindered settling |
| D. | Zone settling |
| Answer» C. Hindered settling | |
| 21. |
If wastewater is disposed of into a natural stream, the maximum dissolved oxygen depletion occurs in the zone of_______ |
| A. | degradation |
| B. | active decomposition |
| C. | clearer water |
| D. | recovery |
| Answer» C. clearer water | |
| 22. |
If the average sewage from a city is 95 × 106 l/day and the average 5-day BOD is 300 mg/l against a standard of 75 mg/day per capita at 20°C, then the population equivalent of the city will be |
| A. | 28,500 |
| B. | 285 × 106 |
| C. | 3,80,000 |
| D. | 380 × 106 |
| Answer» E. | |
| 23. |
In ground water, the muddy or cloudy appearance of clay or such other particles that presents hindrance to the path of light, is measured by: |
| A. | screening |
| B. | Jackson turbidity meter |
| C. | Steven turbidity meter |
| D. | Nessler's tubes |
| Answer» C. Steven turbidity meter | |
| 24. |
Biochemical Oxygen Demand (BOD) is a measure of |
| A. | Oxygen utilized during by natural means |
| B. | Suspended particles in water |
| C. | Suspended particles in air |
| D. | Noise level in air |
| Answer» B. Suspended particles in water | |
| 25. |
Consider the following statements:1. The quality of waste water is determined on the basis of DO.2. The BOD test is based on DO.3. Determination of DO helps in controlling corrosion.Which of the above statements are correct? |
| A. | 1, 2 and 3 |
| B. | 1 and 2 only |
| C. | 1 and 3 only |
| D. | 2 and 3 only |
| Answer» C. 1 and 3 only | |
| 26. |
Disinfection of drinking water is done to remove: |
| A. | Turbidity |
| B. | Odour |
| C. | Colour |
| D. | Bacteria |
| Answer» E. | |
| 27. |
BOD (Bio Chemical Oxygen Demand) of safe drinking water must be: |
| A. | 0 |
| B. | 50 ppm |
| C. | 100 ppm |
| D. | 200 ppm |
| Answer» B. 50 ppm | |
| 28. |
Measure of the degree at which water looses its transparency due to the presence of suspended particulates is termed as: |
| A. | coagulation |
| B. | sedimentation |
| C. | flocculation |
| D. | turbidity |
| Answer» E. | |
| 29. |
In practice, flow velocity adopted for the design of a grit chamber is: |
| A. | 3 to 5 m/sec |
| B. | 0.25 to 0.3 m/sec |
| C. | 1 to 2 m/sec |
| D. | 0.5 to 2 m/sec |
| Answer» C. 1 to 2 m/sec | |
| 30. |
Length to width ratio of rectangular sedimentation tank should be |
| A. | 3 : 4 |
| B. | 3 : 1 |
| C. | 4 : 1 |
| D. | 1 : 5 |
| Answer» D. 1 : 5 | |
| 31. |
Five-days BOD of a 10% diluted sample having Do = 6.7 mg/l, Ds = 2 mg/l and consumption of oxygen in blank = 0.5 mg/l will be |
| A. | 22 mg/l |
| B. | 42 mg/l |
| C. | 62 mg/l |
| D. | 82 mg/l |
| Answer» C. 62 mg/l | |
| 32. |
Activated sludge process is an example of: |
| A. | Anaerobic suspended growth process |
| B. | Anaerobic attached growth process |
| C. | Aerobic attached growth process |
| D. | Aerobic suspended growth process |
| Answer» E. | |
| 33. |
Consider the following statements regarding biochemical oxygen demand (BOD) of river water:1. The BOD rate constant varies with river water temperature2. The BOD rate constant does not depend on the BOD of the river water3. The BOD rate constant is often different for different river waters4. The BOD rate constant cannot be determined in a laboratoryWhich of the above statements are correct? |
| A. | 1 and 4 |
| B. | 1 and 3 |
| C. | 2 and 3 |
| D. | 2 and 4 |
| Answer» C. 2 and 3 | |
| 34. |
According to Stoke’s Law for settling velocity of small particles and viscous flow. |
| A. | \({v_s} = \frac{g}{{18}}.\left( {G - 1} \right).\frac{d}{v}\) |
| B. | \({v_s} = \frac{g}{{18}}.\left( {G - 1} \right).\frac{{{d^2}}}{v}\) |
| C. | \({v_s} = \frac{{18}}{g}.\left( {G - 1} \right).\frac{{{d^2}}}{v}\) |
| D. | \({v_s} = \frac{g}{{18}}.\left( {G + 1} \right).\frac{{{d^2}}}{v}\) |
| Answer» C. \({v_s} = \frac{{18}}{g}.\left( {G - 1} \right).\frac{{{d^2}}}{v}\) | |
| 35. |
In BOD5 determination of sewage, the initial dissolved oxygen is measured to be 8.3 mg/l. However, after 5-days incubation at 20°C temperature, the dissolved oxygen is found to be 2.3 mg/l. If the dilution factor is 1:60, the BOD5 of the sewage would be |
| A. | 360 mg/l |
| B. | 260 mg/l |
| C. | Cannot be determined |
| D. | 6.0 mg/l |
| Answer» B. 260 mg/l | |
| 36. |
IDENTIFY_THE_INCORRECT_STATEMENT_FROM_THE_FOLLOWING??$ |
| A. | High odor intensity indicates odorless water |
| B. | Fresh sewage is odorless |
| C. | Turbidity can be measured by turbidity rod |
| D. | NTU is a unit of turbidity |
| Answer» B. Fresh sewage is odorless | |
| 37. |
______ represents the number of dilutions required to reduce odor.$ |
| A. | Dispersion |
| B. | Threshold odor number |
| C. | BOD |
| D. | COD |
| Answer» C. BOD | |
| 38. |
________indicates_the_freshness_of_sewage.$ |
| A. | Turbidity |
| B. | Color |
| C. | Temperature |
| D. | COD |
| Answer» C. Temperature | |
| 39. |
The type of wastewater from the flushing operation of toilet is |
| A. | Green water |
| B. | Red water |
| C. | Black water |
| D. | Brown water |
| Answer» D. Brown water | |
| 40. |
The wastewater from the kitchen is an example of |
| A. | Black water |
| B. | Yellow water |
| C. | Green water |
| D. | Grey water |
| Answer» E. | |
| 41. |
The odor quality of compound is ammoniacal. Identify the type of compound from the following options. |
| A. | Acetic acid |
| B. | Benzene |
| C. | Ammonia |
| D. | Methane |
| Answer» D. Methane | |
| 42. |
The odor quality of Amines is |
| A. | Rotten egg |
| B. | Fishy |
| C. | Fecal matter |
| D. | Decayed cabbage |
| Answer» C. Fecal matter | |
| 43. |
In India, the average temperature of sewage i? |
| A. | 10<sup>o</sup>C |
| B. | 20<sup>o</sup>C |
| C. | 40<sup>o</sup>C |
| D. | 80<sup>o</sup>C |
| Answer» C. 40<sup>o</sup>C | |
| 44. |
The odor in wastewater is measured by |
| A. | Osmoscope |
| B. | Chromatography |
| C. | Olfactometer |
| D. | Turbidity meter |
| Answer» B. Chromatography | |
| 45. |
The color of the septic sewage is |
| A. | Pink |
| B. | Red |
| C. | Black |
| D. | Grey |
| Answer» D. Grey | |
| 46. |
Which color indicates the fresh sewage? |
| A. | Pink |
| B. | Red |
| C. | Black |
| D. | Grey |
| Answer» E. | |
| 47. |
When the sewage becomes stronger, the turbidity of wastewater |
| A. | Increases |
| B. | Decreases |
| C. | Becomes constant |
| D. | Slightly decrease |
| Answer» B. Decreases | |
| 48. |
Which of the following instrument is used to measure turbidity? |
| A. | Olfactometer |
| B. | Turbidity meter |
| C. | Colorimeter |
| D. | Spectrophotometer |
| Answer» C. Colorimeter | |
| 49. |
Which of the following is measured in mg/L? |
| A. | Unit weight |
| B. | Coefficient of cohesion |
| C. | Discharge |
| D. | Turbidity |
| Answer» E. | |
| 50. |
Which of the following represents the physical characteristics of water? |
| A. | Chloride content |
| B. | BOD |
| C. | Turbidity |
| D. | COD |
| Answer» D. COD | |