Environmental Engineering – Multiple Choice Questions (MCQs)

1. 85. The "trickling filter" is a type of:

   • A. Chemical treatment
   • B. Biological treatment
   • C. Physical treatment
   • D. Preliminary treatment

2. 86. What is "Sludge Volume Index (SVI)"?

   • A. A measure of sludge quantity
   • B. A measure of the settleability of activated sludge
   • C. A measure of sludge density
   • D. A measure of sludge dryness

3. 87. What is "Adsorption" in wastewater treatment?

   • A. Adding chemicals to wastewater
   • B. A process where molecules adhere to the surface of a solid
   • C. Heating wastewater
   • D. Filtering wastewater

4. 88. What is "Ion Exchange" in water treatment?

   • A. A process for changing the pH of water
   • B. A process that removes dissolved ionic contaminants by exchanging them for other ions
   • C. A process for disinfection
   • D. A process for removing suspended solids

5. 89. Which instrument is used to measure the turbidity of water?

   • A. pH meter
   • B. Spectrophotometer
   • C. Nephelometer
   • D. Conductivity meter

6. 90. What is "Incineration" in waste management?

   • A. Burying waste
   • B. Burning waste at high temperatures
   • C. Composting waste
   • D. Recycling waste

7. 91. The "carbon sequestration" refers to:

   • A. Release of carbon dioxide
   • B. Capture and long-term storage of atmospheric carbon dioxide
   • C. Burning carbon
   • D. Creating carbon

8. 92. What is "Bioaccumulation"?

   • A. The process of breaking down toxins
   • B. The gradual accumulation of substances
   • C. such as pesticides or other chemicals
   • D. in an organism

9. 93. What is "Green Building"?

   • A. A building painted green
   • B. A building designed and operated to minimize its environmental impact
   • C. A building made of recycled materials
   • D. A building with many plants

10. 94. The "carrying capacity" of an environment refers to:

    • A. The maximum population size of a species that the environment can sustain indefinitely
    • B. The maximum speed of vehicles in an area
    • C. The maximum amount of pollution an area can withstand
    • D. The maximum height of buildings

11. 95. What is "Wastewater Reuse"?

    • A. Discharging wastewater into rivers
    • B. Using treated wastewater for beneficial purposes
    • C. Storing wastewater indefinitely
    • D. Dumping wastewater into oceans

12. 96. The "zero liquid discharge (ZLD)" system aims to:

    • A. Discharge all liquid waste
    • B. Treat wastewater such that no liquid effluent is discharged to the environment
    • C. Use more water
    • D. Increase water pollution