MCQOPTIONS
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MCQOPTIONS
This section includes 11 Mcqs, each offering curated multiple-choice questions to sharpen your Environmental Science knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The thickness of the layers of filter sand of zeolite softener is |
| A. | 20cm |
| B. | 30cm |
| C. | 40cm |
| D. | 100cm |
| Answer» E. | |
| 2. |
The sludge in water softening accelerator is deposited at |
| A. | Sedimentation tank |
| B. | Reaction zone |
| C. | Concentrator |
| D. | Secondary mixing zone |
| Answer» D. Secondary mixing zone | |
| 3. |
State whether the following statement is true or false.The permanent hardness can be removed by adding lime and soda. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 4. |
Which of the following is a disadvantage of zeolite process? |
| A. | No sludge is formed |
| B. | The process is almost automatic |
| C. | Suspended impurities get deposited around the zeolite particles |
| D. | Zero hardness can be occurred |
| Answer» D. Zero hardness can be occurred | |
| 5. |
Which filter is normally used in the lime soda treatment plant? |
| A. | Slow sand filter |
| B. | Rapid sand filter |
| C. | Dual media filter |
| D. | Mixed media filter |
| Answer» C. Dual media filter | |
| 6. |
The temporary hardness in water is due to the presence of |
| A. | Sulfates, Chlorides |
| B. | Sulfates, Chlorides, nitrates |
| C. | Carbonates and bicarbonates |
| D. | Sulfates and carbonates |
| Answer» D. Sulfates and carbonates | |
| 7. |
What is the detention time of a water softening accelerator? |
| A. | 1-6minutes |
| B. | 20minutes |
| C. | 30 minutes |
| D. | 1-2hours |
| Answer» E. | |
| 8. |
The total hardness of water is 100ppm as CaCO3 equivalent. What is the type of water? |
| A. | Soft |
| B. | Moderately hard |
| C. | Hard |
| D. | Very hard |
| Answer» C. Hard | |
| 9. |
The Total hardness of soft water as CaCO3 equivalent is |
| A. | 50ppm |
| B. | 100ppm |
| C. | 150ppm |
| D. | 200ppm |
| Answer» B. 100ppm | |
| 10. |
State whether the following statement is true or falseThe zeolite process is unsuitable for water containing iron and manganese. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 11. |
Permutit has an exchange value of ________ grams of hardness per m3 of zeolite. |
| A. | 10000 |
| B. | 20,000-30,000 |
| C. | 35,000-40,000 |
| D. | 40,000-50,000 |
| Answer» D. 40,000-50,000 | |