What causes turbidity in water?

• • A) Dissolved gases

• • B) Suspended solids

• • C) Heavy metals

• • D) pH levels

How is water color typically measured?

• • A) pH meter

• • B) Turbidimeter

• • C) Nenlar tubes

• • D) Spectrophotometer

What is the ideal range of pH for aquatic life?

• • A) 0–3

• • B) 6–9

• • C) 3–6

• • D) 9–12
    

Which chemical contributes to eutrophication in water bodies?

• • A) Calcium

• • B) Nitrogen

• • C) Fluoride

• • D) Magnesium

Calculate the BOD using the formula:
Initial DO = 10 mg/L, Final DO = 6.25 mg/L, Dilution Factor = 300/6.

• • A) 187.5 mg/L

• • B) 200 mg/L

• • C) 250 mg/L

• • D) 275 mg/L

What does a high level of coliform bacteria in water indicate?

• • A) High oxygen levels

• • B) Presence of pathogens

• • C) Excess nutrients

• • D) Acidic pH

What is the term for excessive nutrient-induced algal growth in water?

• • A) Eutrophication

• • B) BOD

• • C) Filtration

• • D) Bioaccumulation