MCQOPTIONS
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MCQOPTIONS
This section includes 5 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 contact time for disinfection by combined chlorine is ______________ |
| A. | 20 minutes |
| B. | 30 minutes |
| C. | 40 minutes |
| D. | 60 minutes |
| Answer» E. | |
| 2. |
The contact time for disinfection by free chlorine is ______________ |
| A. | 20 minutes |
| B. | 30 minutes |
| C. | 40 minutes |
| D. | 60minutes |
| Answer» B. 30 minutes | |
| 3. |
The efficiency of chlorine increase by ______________ |
| A. | Presence of metallic compounds |
| B. | When the pH of the water increases |
| C. | When the pH of the water decreases |
| D. | Turbid water |
| Answer» D. Turbid water | |
| 4. |
The amount of hypochlorous acid formed when pH of water is 8 is _______________ |
| A. | 95% of total free chlorine |
| B. | 80% of total free chlorine |
| C. | 30% of total free chlorine |
| D. | 5% of total free chlorine |
| Answer» D. 5% of total free chlorine | |
| 5. |
When turbidity in water increases, the efficiency of chlorine? |
| A. | Decreases |
| B. | Increases |
| C. | Slightly increases |
| D. | Remains constant |
| Answer» B. Increases | |