BCE Environmental Engineering

Question 1

What does BOD stand for in water quality assessment?

Accepted Answer

Biochemical Oxygen Demand

Answer

BOD (Biochemical Oxygen Demand) measures the amount of dissolved oxygen consumed by biological organisms when decomposing organic matter in a given water sample over a set period.

Question 2

Which unit process in a conventional water treatment plant removes suspended solids by settling?

Accepted Answer

Sedimentation

Answer

Sedimentation (clarification) allows suspended solids and floc formed during coagulation and flocculation to settle out of the water under gravity.

Question 3

The primary purpose of chlorination in drinking water treatment is:

Accepted Answer

To disinfect and kill pathogens

Answer

Chlorination is the primary disinfection method used to kill or inactivate pathogens (bacteria, viruses, protozoa) in drinking water to make it safe for human consumption.

Question 4

What is the main objective of primary wastewater treatment?

Accepted Answer

Physical removal of settleable solids and floating material

Answer

Primary treatment uses physical processes (screening, sedimentation) to remove approximately 60% of suspended solids and 35% of BOD from raw wastewater.

Question 5

Which parameter measures the acid-neutralizing capacity of a water body?

Accepted Answer

Alkalinity

Answer

Alkalinity measures a water's capacity to neutralize acids, primarily due to bicarbonate, carbonate, and hydroxide ions, and is expressed in mg/L as CaCO₃.

BCE - Bachelor of Civil Engineering Practice Test

BCE - Bachelor of Civil Engineering Practice Test

BCE Environmental Engineering