MCQOPTIONS
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MCQOPTIONS
This section includes 180 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 effective size of sand of the slow sand filter is __________ |
| A. | 0.1-0.2mm |
| B. | 0.2-0.3mm |
| C. | 0.4-0.7mm |
| D. | 1-2mm |
| Answer» C. 0.4-0.7mm | |
| 2. |
When does the particle become suspended in an expanded bed? |
| A. | When superficial velocity is greater than critical velocity |
| B. | When superficial velocity is less than critical velocity |
| C. | When superficial velocity is equal to critical velocity |
| D. | When superficial velocity is constant |
| Answer» D. When superficial velocity is constant | |
| 3. |
Which of the following represents the correct relation between dimensionless friction factor f and Reynolds number? |
| A. | f = 150* ((1-e) /R²) + 1.75 |
| B. | f = 150* ((1-e) /R) +1.75 |
| C. | f = 150* ((1-e) /R³) + 1.75 |
| D. | f = 150* ((1-e²) /R) + 1.75 |
| Answer» C. f = 150* ((1-e) /R³) + 1.75 | |
| 4. |
The minimum depth of sand of a rapid sand filter is given by __________ |
| A. | Stokes formula |
| B. | Clark’s formula |
| C. | Hudson formula |
| D. | Emden formula |
| Answer» D. Emden formula | |
| 5. |
The value of specific gravity for Garnet sand is ____ |
| A. | 2.1 |
| B. | 3.6 |
| C. | 4.2 |
| D. | 5.1 |
| Answer» D. 5.1 | |
| 6. |
Rose equation is valid for beds in which voids are clear and unobstructed. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» B. False | |
| 7. |
The value of uniformity coefficient for uniformly graded sand is ______ |
| A. | 0 |
| B. | 1 |
| C. | 10 |
| D. | 100 |
| Answer» C. 10 | |
| 8. |
The cracking of bed is more prominent __________ |
| A. | Near the wall junction |
| B. | Outside the wall junction |
| C. | Inside the wall junction |
| D. | On the wall junction |
| Answer» B. Outside the wall junction | |
| 9. |
How the problem of sand incrustation can be minimized? |
| A. | Carbonating the water |
| B. | Proportioning of layers of sand and gravel |
| C. | Surface washing |
| D. | Control of algae growth in the water |
| Answer» B. Proportioning of layers of sand and gravel | |
| 10. |
The bacterial removal efficiency of the rapid sand filter is ______ in comparison to slow sand filter. |
| A. | More |
| B. | Less |
| C. | Equal |
| D. | Better |
| Answer» C. Equal | |
| 11. |
The tendency of jetting can be minimized by __________ |
| A. | Carbonating the water |
| B. | Proportioning of layers of sand and gravel |
| C. | Surface washing |
| D. | Control of algae growth in the water |
| Answer» D. Control of algae growth in the water | |
| 12. |
Consider the following statement.i. The penetration of suspended matter is deep in the slow sand filterii. The penetration of suspended matter is superficial in the rapid sand filteriii. Coagulation is not required in the slow sand filterWhich of the above statement is/are correct? |
| A. | Only iii |
| B. | i, ii |
| C. | i, ii, iii |
| D. | ii, iii |
| Answer» B. i, ii | |
| 13. |
What is the diameter of drum of a Micro-Strainer? |
| A. | 1m |
| B. | 2m |
| C. | 3m |
| D. | 4m |
| Answer» D. 4m | |
| 14. |
The maximum daily demand of a city is 24*10⁵ and the rate of filtration is 100 per litre per hour per m². What is the area of the filter? |
| A. | 10 |
| B. | 100 |
| C. | 1000 |
| D. | 1500 |
| Answer» D. 1500 | |
| 15. |
What is the ratio in which coal, sand and garnet are present in the mixed media filter? |
| A. | 2 : 3 : 5 |
| B. | 4 : 2 : 1 |
| C. | 6 : 3 : 1 |
| D. | 1 : 2 : 3 |
| Answer» D. 1 : 2 : 3 | |
| 16. |
The coarser layer used in a dual media filter is of __________ |
| A. | Sand |
| B. | Anthracite |
| C. | Garnet sand |
| D. | Rice husk |
| Answer» C. Garnet sand | |
| 17. |
Which of the following order is correct regarding the thickness of layer of the materials used in the mixed media filter? |
| A. | Anthracite coal < Sand > Garnet sand |
| B. | Anthracite coal > Sand > Garnet sand |
| C. | Anthracite coal = Sand = Garnet sand |
| D. | Anthracite coal < Sand < Garnet sand |
| Answer» C. Anthracite coal = Sand = Garnet sand | |
| 18. |
Which device is used for screening stored water which do not contain microscopic sized particles? |
| A. | Tube settler |
| B. | Clarifier |
| C. | Flocculator |
| D. | Micro-Strainers |
| Answer» E. | |
| 19. |
The effective size of a pressure sand filter is ______ |
| A. | 0.45mm |
| B. | 0.7mm |
| C. | 0.8mm |
| D. | 0.9mm |
| Answer» B. 0.7mm | |
| 20. |
Consider the following statements regarding diatomite filters.i. They are not used for water having high turbidity.ii. They are not suitable for municipal water supplies.iii. They are not used for temporary and shifting camps.Which of the above statement is/are false? |
| A. | i, ii, iii |
| B. | i only |
| C. | ii only |
| D. | iii only |
| Answer» E. | |
| 21. |
How many types of settling are there in the sedimentation tank? |
| A. | 3 |
| B. | 4 |
| C. | 5 |
| D. | 6 |
| Answer» C. 5 | |
| 22. |
In which type of settling, settling of particles takes place by the contact of impurities with each other present in wastewater? |
| A. | Flocculent settling |
| B. | Hindered settling |
| C. | Compression settling |
| D. | Discrete settling |
| Answer» D. Discrete settling | |
| 23. |
The thickness of the base material on which filter media are supported is __________ |
| A. | 10-100cm |
| B. | 20-80cm |
| C. | 30-75cm |
| D. | 10-30cm |
| Answer» D. 10-30cm | |
| 24. |
How many types of sedimentation tanks are there on the basis of the method of operation? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» B. 3 | |
| 25. |
In which type of sedimentation, the flocculent suspension of the intermediate concentration takes place? |
| A. | Type I sedimentation |
| B. | Type II sedimentation |
| C. | Type III sedimentation |
| D. | Type IV sedimentation |
| Answer» D. Type IV sedimentation | |
| 26. |
The overflow rate for a plain sedimentation tank is ______ litre/day/metre². |
| A. | 50000 |
| B. | 40000 |
| C. | 12000 |
| D. | 30000 |
| Answer» D. 30000 | |
| 27. |
The detention period for a sedimentation tank where coagulation takes place is ____________ |
| A. | 30 seconds |
| B. | 1 minute |
| C. | 1hour |
| D. | 2hour |
| Answer» E. | |
| 28. |
Which of the following cannot be the velocity of flow in the horizontal flow sedimentation tank? |
| A. | 12cm/min |
| B. | 39cm/min |
| C. | 5cm/min |
| D. | 20cm/min |
| Answer» C. 5cm/min | |
| 29. |
What is the value of uniformity coefficient in a pressure sand filter? |
| A. | 1 |
| B. | 1.5 |
| C. | 2 |
| D. | 2.5 |
| Answer» C. 2 | |
| 30. |
The thickness of sand bed of a pressure filter is _____ cm. |
| A. | 10-20 |
| B. | 20-30 |
| C. | 30-50 |
| D. | 50-60 |
| Answer» E. | |
| 31. |
In which of the following filter, two layers filtering media is provided for filtration? |
| A. | Slow sand filter |
| B. | Pressure filter |
| C. | Rapid sand filter |
| D. | Dual media filter |
| Answer» E. | |
| 32. |
What is Cᵤ in the expression Cᵤ= D₆₀/D₁₀ where D₆₀ and D₁₀ are the sizes of particle such that 60% and 10% of the particles are finer than these sizes respectively? |
| A. | Coefficient of compaction |
| B. | Coefficient of consolidation |
| C. | Uniformity coefficient |
| D. | Effective size |
| Answer» D. Effective size | |
| 33. |
Which of the following is correct regarding the cheapest filter material used in water treatment? |
| A. | Sand>Anthracite>Garnet sand |
| B. | Sand<Anthracite>Garnet sand |
| C. | Sand<Anthracite<Garnet sand |
| D. | Sand=Anthracite>Garnet sand |
| Answer» B. Sand<Anthracite>Garnet sand | |
| 34. |
In the expression vS = 1.8 (g*d (G-1))½, the diameter of spherical particle is ____________ |
| A. | 0.1mm |
| B. | < 0.1mm |
| C. | 1mm |
| D. | >1mm |
| Answer» E. | |
| 35. |
In which of the following filter, water is passed under higher pressure? |
| A. | Slow sand filter |
| B. | Rapid sand filter |
| C. | Dual media filter |
| D. | Pressure filter |
| Answer» E. | |
| 36. |
The final loss of head in slow sand filter is ______ than rapid sand filter. |
| A. | Higher |
| B. | Lower |
| C. | Slightly Lower |
| D. | Equivalent |
| Answer» C. Slightly Lower | |
| 37. |
In which type of filter, water flows in upward direction? |
| A. | Slow sand filter |
| B. | Rapid sand filter |
| C. | Pressure filter |
| D. | Up flow filter |
| Answer» E. | |
| 38. |
Consider the following statements regarding sand as filter material.i. It should be free from clay or siltii. Organic matter should be present in the sandiii. It should be nonuniformWhich of the above statement is/are correct? |
| A. | i, ii |
| B. | i only |
| C. | ii, iii |
| D. | i, ii, iii |
| Answer» C. ii, iii | |
| 39. |
The filter run in rapid sand filter should not be less than _____ hours. |
| A. | 1 |
| B. | 6 |
| C. | 12 |
| D. | 24 |
| Answer» E. | |
| 40. |
What is the value of specific gravity of sand filter? |
| A. | 2 |
| B. | 2.6 |
| C. | 3.1 |
| D. | 3.5 |
| Answer» C. 3.1 | |
| 41. |
The minimum number of filter beds in the slow sand filter is __________ |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 3 |
| Answer» C. 3 | |
| 42. |
Filtration operation in pressure filter is same as in rapid sand filter. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» C. May be True or False | |
| 43. |
The up flow filter is used in domestic water supply. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» C. May be True or False | |
| 44. |
Which of the following statement is wrong regarding filtration? |
| A. | It removes fine particle |
| B. | It removes suspended solids not removed by sedimentation |
| C. | It does not remove turbidity |
| D. | It removes color |
| Answer» D. It removes color | |
| 45. |
Which of the following is not commonly used as a filter material in the treatment of water? |
| A. | Sand |
| B. | Anthracite |
| C. | Crushed rock |
| D. | Garnet sand |
| Answer» D. Garnet sand | |
| 46. |
The superficial velocity in a stratified bed is equal to __________ |
| A. | Terminal settling velocity |
| B. | Terminal settling velocity * porosity |
| C. | Terminal settling velocity * (porosity)² |
| D. | Terminal settling velocity * (porosity)⁴·⁵ |
| Answer» E. | |
| 47. |
Consider the following statements regarding pressure filter.i. It is easy to inspect the under drainage systemii. It is not possible to provide time for chlorination in direct supply from itiii. It is not possible to observe the degree of back washing and the agitation processWhich of the above statement is correct? |
| A. | i only |
| B. | ii, iii |
| C. | i, ii, iii |
| D. | i, iii |
| Answer» C. i, ii, iii | |
| 48. |
In which action of filtration, particles coarser than the void size is arrested? |
| A. | Mechanical Straining |
| B. | Sedimentation |
| C. | Biological mechanism |
| D. | Electrolytic action |
| Answer» B. Sedimentation | |
| 49. |
Identify the correct statement from the following options. |
| A. | Rapid sand filter has a high initial cost |
| B. | Coagulation is essential in slow sand filter |
| C. | Slow sand filter requires skilled supervision |
| D. | Period of cleaning of Rapid sand filter is 1-2 days |
| Answer» E. | |
| 50. |
The pulsator clarifier is a type of __________ |
| A. | Horizontal flow sludge tank |
| B. | Vertical flow sludge tank |
| C. | Circular sludge tank |
| D. | Plain sedimentation tank |
| Answer» C. Circular sludge tank | |