#Question id: 40497
#Applied Microbiology
Consider the following statements regarding the products of wastewater treatment:
Statement I: The insoluble organic solids that settle during primary and secondary treatment are referred to as sludge.
Statement II: Anaerobic digestion of sludge produces biogas, which can be used as a renewable energy source.
#Question id: 40498
#Applied Microbiology
Assertion (A): Tertiary treatment is often considered the most expensive and advanced stage of wastewater treatment.
Reason (R): It involves specialized processes like UV radiation, chlorination, or reverse osmosis to remove specific contaminants and pathogens.
#Question id: 40499
#Applied Microbiology
Match the wastewater treatment step in Column A with its primary objective in Column B
| Column A (Step) | Column B (Objective) |
| 1. Bar Screens | i. Removal of dissolved nitrates and phosphates |
| 2. Grit Chamber | ii. Removal of large floating objects (plastics, rags) |
| 3. Secondary Clarifier | iii. Settlement of sand, gravel, and heavy inorganic solids |
| 4. Tertiary Treatment | iv. Separation of biological flocs (activated sludge) |
#Question id: 40500
#Environmental Science
| List I (Process) | List II (Outcome/Characteristic) |
| A. Composting | 1. Volume reduction |
| B. Incineration | 2. Nutrient recycling |
| C. Landfilling | 3. Energy recovery |
| D. Anaerobic digestion | 4. Methane production |
#Question id: 40501
#Environmental Science
| List I (Source) | List II (Impact/Issue) |
| A. Groundwater | 3. Over-extraction (Depletion of aquifers) |
| B. Fossil fuel | 2. Air pollution (Emissions from burning) |
| C. Soil | 1. Salinization ( accumulation of salt in land) |
| D. Plastic waste | 4. Microplastic contamination (Breakdown of plastics) |
#Question id: 40502
#Environmental Science