FREE NEHA Water Quality Questions and Answers

Question 1

Which of the following is the most common method used to disinfect drinking water?

Accepted Answer

Chlorination

Answer

Boiling

Answer

Filtration

Answer

Fluoridation

Question 2

What is the maximum contaminant level (MCL) for lead in drinking water according to the U.S. Environmental Protection Agency (EPA)?

Accepted Answer

0.015 mg/L

Answer

0.05 mg/L

Answer

0.1 mg/L

Answer

0.5 mg/L

Question 3

What does pH measure in water quality?

Accepted Answer

The acidity or alkalinity of water

Answer

The amount of dissolved oxygen

Answer

The concentration of heavy metals

Answer

The temperature of water

Question 4

Which of the following contaminants is often responsible for causing algal blooms in water bodies?

Accepted Answer

Nitrates and phosphates

Answer

Heavy metals

Answer

Pesticides

Answer

Chlorine

Question 5

What is the main health concern associated with high levels of nitrates in drinking water?

Accepted Answer

Blue baby syndrome (methemoglobinemia)

Answer

Increased risk of cancer

Answer

Bone deformities

Answer

Neurological disorders