Quiz about ESS.8.3 Water Quality

Question 1

What is water quality?

Accepted Answer

How clean and safe water is

Answer

The amount of salt in the water

Answer

The number of fish in a river

Answer

How deep a lake is

Question 2

What is potable water?

Accepted Answer

Water that is safe to drink

Answer

Water found in the ocean

Answer

Water with high turbidity

Answer

Water with no dissolved oxygen

Question 3

Which factor directly affects the amount of oxygen in water?

Accepted Answer

Temperature

Answer

Turbidity

Answer

pH

Answer

Nitrates

Question 4

What happens when water has high turbidity?

Accepted Answer

Sunlight is blocked, harming aquatic plants

Answer

The water becomes more acidic

Answer

More dissolved oxygen is available

Answer

Fish populations increase

Question 5

Why is water quality important for humans?

Accepted Answer

It affects drinking water, cooking, and farming

Answer

It makes lakes look prettier

Answer

It keeps rocks from dissolving

Answer

It reduces the need for water conservation

Question 6

How do nitrates and phosphates affect aquatic life?

Accepted Answer

They cause eutrophication, reducing oxygen levels

Answer

They help fish grow faster

Answer

They make water colder

Answer

They decrease water turbidity

Question 7

How can bioindicators help scientists assess water quality?

Accepted Answer

They measure the pH of water

Answer

They clean polluted water

Answer

Their presence or absence shows water pollution levels

Answer

They add oxygen to the water

Question 8

What happens when dissolved oxygen levels drop too low?

Accepted Answer

Fish and other aquatic life can die

Answer

More fish survive

Answer

The water becomes clearer

Answer

The pH increases

Question 9

How might a factory dumping warm water into a river affect the ecosystem?

Accepted Answer

It could lower dissolved oxygen and harm fish

Answer

It would increase biodiversity

Answer

It would help plants grow faster

Answer

It would make the water more acidic

Question 10

If a scientist finds only pollution-tolerant organisms in a river, what does that indicate?

Accepted Answer

The water quality may be poor

Answer

The water is very clean

Answer

There is no turbidity in the water

Answer

The water has a neutral pH

Question 11

Why might a sudden increase in algae in a lake be a cause for concern?

Accepted Answer

It can lead to eutrophication and decrease oxygen levels

Answer

It means the water is becoming healthier

Answer

It will increase the number of fish

Answer

It will make the water cooler

Question 12

How can human activity negatively impact water quality?

Accepted Answer

By introducing pollutants like fertilizers and chemicals

Answer

By increasing dissolved oxygen levels

Answer

By reducing nitrates in the water

Answer

By lowering water temperatures

Question 13

Design an investigation to test how pH levels affect aquatic plant growth. What would be an important factor to measure?

Accepted Answer

The growth rate of aquatic plants under different pH levels

Answer

The amount of sunlight in the area

Answer

The number of fish in the water

Answer

The number of birds near the water

Question 14

A city experiences high levels of nitrates in its water supply. What steps could officials take to improve water quality?

Accepted Answer

Reduce agricultural runoff and treat wastewater

Answer

Increase fertilizer use

Answer

Add more phosphates to balance the water

Answer

Raise the water temperature

Question 15

If an area with a lake sees a sharp drop in bioindicator diversity, what might be the cause?

Accepted Answer

A pollution event has affected water quality

Answer

The water has become healthier

Answer

The lake has gained more fish

Answer

The lake has become deeper

Question 16

How could climate change impact dissolved oxygen levels in oceans and lakes?

Accepted Answer

By increasing water temperature and lowering oxygen levels

Answer

By making the water cleaner

Answer

By reducing nitrates

Answer

By making the water more basic

Question 17

What is point source pollution?

Accepted Answer

Pollution spread over a large area

Answer

Pollution from a single, identifiable source

Answer

Pollution caused by natural events

Answer

Pollution that only affects oceans

Question 18

What is an example of non-point source pollution?

Accepted Answer

Runoff carrying pesticides from multiple farms

Answer

A factory dumping waste into a river

Answer

A leaking oil pipeline

Answer

A sewage plant leaking into a lake

Question 19

Why are spills harmful to water quality?

Accepted Answer

They contaminate large areas of water

Answer

They increase dissolved oxygen levels

Answer

They make water safer for fish

Answer

They neutralize acids in water

Question 20

Which of the following is an indicator of good water quality?

Accepted Answer

Balanced pH

Answer

High turbidity

Answer

Low dissolved oxygen

Answer

High nitrate levels

Question 21

How do fertilizers contribute to water pollution?

Accepted Answer

They cause eutrophication by adding excess nutrients

Answer

They increase oxygen levels

Answer

They remove bacteria from water

Answer

They balance the pH of water

Question 22

Why is industrial waste a concern for water pollution?

Accepted Answer

It may introduce toxic chemicals into water sources

Answer

It makes water clearer

Answer

It increases the water's temperature, making it cleaner

Answer

It only affects small areas of water.

Question 23

How does sewage pollution impact water quality?

Accepted Answer

It introduces harmful bacteria

Answer

It adds oxygen to the water

Answer

It increases the number of bioindicators

Answer

It decreases nitrate levels

Question 24

What factor would most likely indicate water pollution?

Accepted Answer

High levels of nitrates and phosphates

Answer

High dissolved oxygen

Answer

Clear water with low turbidity

Answer

A balanced pH level

Question 25

How might scientists determine if a river is affected by non-point source pollution?

Accepted Answer

They would measure pollution levels at multiple locations

Answer

They would look for a single factory dumping waste

Answer

They would check if only one species of fish is present

Answer

They would test water in the ocean instead.

Question 26

Why might a city's water supply test show high nitrate levels?

Accepted Answer

Runoff from farms and streets introduced excess fertilizers

Answer

Industrial waste was dumped directly into the river

Answer

The city added more oxygen to the water

Answer

Oil spills reduced pollution in the water

Question 27

If a lake suddenly has a lot of algae, what should scientists test for?

Accepted Answer

High levels of nitrates and phosphates

Answer

Increased bioindicators

Answer

Lower turbidity levels

Answer

A decrease in water temperature

Question 28

What could happen if water turbidity is too high?

Accepted Answer

Sunlight is blocked, harming aquatic plants

Answer

Fish populations increase

Answer

Water pH becomes more balanced

Answer

Bioindicators become more diverse

Question 29

How would you design an experiment to test the impact of industrial waste on water quality?

Accepted Answer

Compare water samples from a polluted river and a clean river

Answer

Measure only the temperature of the water

Answer

Add fertilizers to the water and see how fish react

Answer

Remove bioindicators and check for changes

Question 30

A scientist is testing a stream and finds that bioindicator diversity has decreased. What might be the cause?

Accepted Answer

Increased pollution levels

Answer

Higher dissolved oxygen levels

Answer

A balanced pH level

Answer

Lower nitrate levels

Question 31

If a community wants to reduce non-point source pollution, what is the best strategy?

Accepted Answer

Reduce the use of fertilizers and improve runoff management

Answer

Ban all factories

Answer

Dump wastewater into rivers

Answer

Allow oil spills to dilute naturally

Question 32

How could you use bioindicators to monitor water pollution over time?

Accepted Answer

Measure changes in the types and numbers of organisms present

Answer

Remove all bioindicators and see if the water improves

Answer

Add new species to the water and observe the results

Answer

Increase nitrate levels and track changes

Question 33

Why is clean water important for humans?

Accepted Answer

It prevents illness and is needed for drinking and cooking

Answer

It helps plants grow

Answer

It makes rivers look prettier

Answer

It makes airplanes fly

Question 34

What is one way polluted water harms the environment?

Accepted Answer

It kills fish and reduces wildlife populations

Answer

It increases oxygen levels in water

Answer

It makes water safer for swimming

Answer

It helps plants grow faster

Question 35

What is the purpose of a water treatment plant?

Accepted Answer

To remove bacteria, chemicals, and dirt

Answer

To add more chemicals to the water

Answer

To increase pollution

Answer

To change the water's color

Question 36

How does planting trees help protect water quality?

Accepted Answer

Trees filter pollutants before they reach water sources

Answer

Trees release oxygen into water

Answer

Trees remove fish from polluted water

Answer

Trees make the air cleaner but do not affect water

Question 37

Why should fertilizers be used carefully near water sources?

Accepted Answer

Excess fertilizers can wash into rivers and cause pollution

Answer

Fertilizers make water look clearer

Answer

Fertilizers help clean water

Answer

Fertilizers increase oxygen in water

Question 38

What is one action individuals can take to reduce water pollution?

Accepted Answer

Pick up pet waste to prevent bacteria from entering storm drains

Answer

Dump chemicals down the drain

Answer

Use more fertilizers to help plants grow

Answer

Ignore pollution because it does not affect them

Question 39

How does reducing litter help keep water clean?

Accepted Answer

It prevents trash from entering waterways

Answer

It increases the amount of nutrients in water

Answer

It helps fish produce more oxygen

Answer

It makes water treatment unnecessary

Question 40

What might happen if harmful substances enter drains?

Accepted Answer

They can pollute rivers and lakes

Answer

They will be naturally removed by the pipes

Answer

They will improve water quality

Answer

They will disappear on their own

Question 41

How do safety standards help protect water quality?

Accepted Answer

They ensure water is treated and safe for drinking

Answer

They allow pollution in certain areas

Answer

They make water treatment plants unnecessary

Answer

They increase fertilizer use near rivers

Question 42

A scientist finds that fish are dying in a lake. What factor should be investigated first?

Accepted Answer

The amount of dissolved oxygen in the water

Answer

The temperature of the air

Answer

The number of boats on the lake

Answer

The presence of birds near the water

Question 43

Why might a river cleanup project be important for water quality?

Accepted Answer

It helps remove trash and pollutants from the water

Answer

It adds nutrients to the water

Answer

It increases the number of chemicals in the water

Answer

It reduces the amount of fish in the river

Question 44

If a city wants to protect its water supply, what is the best action to take?

Accepted Answer

Improve waste disposal and reduce pollution

Answer

Increase fertilizer use

Answer

Dump wastewater into local rivers

Answer

Eliminate all bioindicators

Question 45

How could a student design an experiment to test how trees affect water quality?

Accepted Answer

Measure pollution levels in water near areas with and without trees

Answer

Cut down trees and observe changes in water

Answer

Add chemicals to the water and record the results

Answer

Test how much water trees absorb in a dry area

Question 46

If a community experiences water pollution from nearby farms, what is the best long-term solution?

Accepted Answer

Educate farmers about reducing fertilizer use and runoff

Answer

Increase water treatment costs

Answer

Stop treating drinking water

Answer

Encourage more factories near water sources

Question 47

A scientist finds high bacteria levels in a river. What should they investigate?

Accepted Answer

Possible sources of sewage or waste pollution

Answer

The amount of sunlight reaching the water

Answer

The presence of bioindicators

Answer

The speed of the river's current

Question 48

How can a local government encourage citizens to help protect water quality?

Accepted Answer

Organize educational programs and community cleanup events

Answer

Require everyone to buy bottled water

Answer

Eliminate water treatment plants

Answer

Allow people to dump trash in rivers

Question 49

What is the main purpose of a water treatment plant?

Accepted Answer

To remove dirt, bacteria, and harmful chemicals

Answer

To add chemicals to water to make it taste better

Answer

To make water more colorful

Answer

To heat water before use

Question 50

During which step of water treatment do chemicals help particles clump together?

Accepted Answer

Coagulation & Flocculation

Answer

Filtration

Answer

Storage

Answer

Disinfection

Question 51

What happens during the sedimentation step of water treatment?

Accepted Answer

Floc settles to the bottom for removal

Answer

Water is stored in large tanks

Answer

Bacteria are killed using UV light

Answer

Water is filtered through sand and gravel

Question 52

Which method is used to disinfect water at a treatment plant?

Accepted Answer

Using chlorine, ozone, or UV light

Answer

Adding fertilizer

Answer

Increasing the temperature

Answer

Mixing in more sediment

Question 53

Why is water treatment important for public health?

Accepted Answer

It removes bacteria and prevents diseases

Answer

It makes water taste better

Answer

It increases the amount of fish in rivers

Answer

It keeps water from freezing in winter

Question 54

What would happen if the filtration step was skipped?

Accepted Answer

Small particles and dirt would remain in the water

Answer

Harmful bacteria would be removed

Answer

Large particles would not settle at the bottom

Answer

Water would become more acidic

Question 55

How does disinfection help make water safe to drink?

Accepted Answer

It kills harmful bacteria, viruses, and germs

Answer

It removes dirt from the water

Answer

It increases the pH level

Answer

It removes all oxygen from the water

Question 56

How does aeration help water quality?

Accepted Answer

It increases the pH level

Answer

It removes dirt from the water

Answer

It kills harmful bacteria, viruses, and germs

Answer

It removes all oxygen from the water

Question 57

If a water treatment plant fails to remove harmful bacteria, what is the most likely consequence?

Accepted Answer

C) People may get sick from drinking contaminated water

Answer

A) Water will taste better

Answer

B) The water will be safer for swimming

Answer

D) More oxygen will be added to the water.

Question 58

A scientist finds that a local water supply has high levels of harmful bacteria. Which step in the treatment process might not be working correctly?

Accepted Answer

Disinfection

Answer

Sedimentation

Answer

Filtration

Answer

Coagulation

Question 59

How does treating water before it enters the environment help protect ecosystems?

Accepted Answer

B) It prevents pollutants and bacteria from harming aquatic life

Answer

A) It adds chemicals that make plants grow faster

Answer

C) It makes the water warmer, which helps fish survive

Answer

D) It increases the amount of sediment in rivers.

Question 60

A town wants to improve its water quality. What is the best way to ensure cleaner water before it even reaches the treatment plant?

Accepted Answer

Reduce pollution and runoff near water sources

Answer

Encourage factories to dump waste in rivers

Answer

Increase the amount of chlorine used at the plant

Answer

Store untreated water for a longer time.

Question 61

A community experiences an increase in waterborne illnesses despite using a treatment plant. What should scientists investigate first?

Accepted Answer

Whether the disinfection process is working properly

Answer

If the town is using too much chlorine

Answer

Whether filtration is adding more bacteria

Answer

If the storage tanks are increasing the temperature.

Question 62

How could a student design an experiment to test the effectiveness of water filtration?

Accepted Answer

A) Compare water samples before and after passing through different filter materials

Answer

B) Mix chemicals into clean water and observe the changes

Answer

C) Add bacteria to water and see how long they survive

Answer

D) Observe a river and count the number of fish.

Question 63

measure of that saltiness and is expressed in parts impurity per thousand parts water

Accepted Answer

Salinity

Answer

Conductivity

Answer

pH

Answer

Turbidity

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