WorksheetsWater Quality Test
Total questions: 20
Worksheet time: 10mins
Which of the following is commonly used to measure the acidity or alkalinity of water?
pH meter
Barometer
Turbidity tube
Thermometer
What does high turbidity in water usually indicate?
Low temperature
High oxygen levels
Presence of suspended particles
Low pH
Which substance is commonly tested in water to determine contamination from fertilizers?
Chlorine
Sodium
Nitrates
Calcium
Why is dissolved oxygen important in water quality testing?
It prevents algae growth
It lowers water temperature
It indicates the presence of heavy metals
It supports aquatic life
What does a low pH value in water typically indicate?
The water is basic
The water is acidic
The water is neutral
The water is salty
Which of the following is used to measure the temperature of water?
pH meter
Thermometer
Turbidity tube
Conductivity probe
Why is lead considered a dangerous contaminant in drinking water?
It causes algae blooms
It increases water hardness
It can lead to serious health problems, especially in children
It improves water clarity
What does the presence of E. coli in water usually indicate?
High oxygen levels
Chemical contamination
Fecal pollution and potential presence of harmful pathogens
Excessive algae growth
What is a key principle of Hawai‘i’s water policy under the State Water Code?
Water is privately owned and managed by landowners
Water is treated as a public trust resource for all residents
Water use is only regulated by federal agencies
Water rights are determined by rainfall amounts
Why is dissolved oxygen (DO) important in assessing water quality?
It supports aquatic organisms by enabling respiration
It determines the water’s pH level
It indicates the presence of heavy metals
It measures the amount of sediment in water
What is one effect of low dissolved oxygen levels in a freshwater ecosystem?
Increased fish populations
Enhanced plant growth
Fish and aquatic organisms may die
Water becomes clearer
What is the primary health concern associated with lead in drinking water?
Upset stomach
Skin irritation
Damage to brain and nervous system, especially in children
Increased energy levels
How does lead most commonly enter drinking water systems?
Through rainfall
From natural springs
By leaching from old pipes and plumbing fixtures
From fertilizer runoff
How can high turbidity affect aquatic ecosystems?
It increases oxygen levels
It improves light penetration
It reduces photosynthesis and harms aquatic plants
It lowers water temperature
A water sample has a lead concentration of 20 ppb. The EPA’s action level is 15 ppb. What does this suggest?
The water is safe to drink
The lead level is below the limit
The water exceeds the safe limit and may be unsafe to drink
Lead is not a concern in drinking water
A sample shows E. coli bacteria present in 100 mL of water. What does this indicate?
The water is safe for drinking
The water may be contaminated with fecal matter and is unsafe
E. coli is a natural part of clean water
The water has high oxygen levels
The pH of a drinking water sample is 5.2. What does this mean?
The water is neutral and safe
The water is too alkaline
The water is acidic and may corrode pipes or leach metals
The water has high turbidity
A water test shows turbidity at 20 NTU (Nephelometric Turbidity Units). The safe drinking water standard is below 5 NTU. What does this suggest?
The water is very clear
The water may contain harmful particles and is unsafe to drink
Turbidity does not affect safety
The water has high oxygen levels
Salinity measures which of the following in water?
The amount of dissolved salts
The temperature
The pH level
The amount of oxygen
How can high salinity levels affect freshwater organisms?
It improves their growth
It can cause dehydration and stress
It increases oxygen levels
It lowers water temperature
