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AP Environmental Science Practice Quiz: Sources of Pollution

Written by AP Content Team, Verified for 2026 AP Exams, Last updated: May 2026

Test your understanding with short quizzes. This quiz has 9 questions to check your progress.

Question 1 of 9

Which of the following best defines a point source of pollution?

All Questions (9)

Which of the following best defines a point source of pollution?

A) A single, identifiable source of a pollutant.

B) A diffused source of pollution that is difficult to identify.

C) Pollution that comes from multiple sources combined.

D) Any form of pollution that affects a large geographic area.

Correct Answer: A

According to the provided text, 'A point source refers to a single, identifiable source of a pollutant, such as a smokestack or waste discharge pipe.'

A factory releases wastewater directly into a river through a large pipe. This is an example of which type of pollution source?

A) Nonpoint source

B) Point source

C) Diffused source

D) Urban runoff

Correct Answer: B

The waste discharge pipe is a single, identifiable source, which is the definition of a point source as stated in the provided content.

Pollution sources that are described as 'diffused and can therefore be difficult to identify' are known as which of the following?

A) Concentrated sources

B) Singular sources

C) Point sources

D) Nonpoint sources

Correct Answer: D

The content explicitly states that 'Nonpoint sources of pollution are diffused and can therefore be difficult to identify.'

After a heavy rainstorm, excess fertilizers and pesticides from numerous suburban lawns and gardens wash into the local stream. This scenario best illustrates which of the following?

A) A point source from a waste discharge pipe.

B) A nonpoint source from urban runoff.

C) A point source from pesticide spraying.

D) A nonpoint source from a smokestack.

Correct Answer: B

The pollution comes from a wide, diffused area (numerous lawns and gardens) and is carried by rain, which is characteristic of urban runoff, a type of nonpoint source mentioned in the text.

What is the primary characteristic that distinguishes a point source from a nonpoint source of pollution?

A) The chemical composition of the pollutant.

B) The total volume of pollution produced.

C) The ability to identify the specific origin of the pollution.

D) The medium through which the pollution travels (air or water).

Correct Answer: C

The provided text emphasizes that point sources are 'single, identifiable' while nonpoint sources are 'diffused and... difficult to identify.' Therefore, the key difference is the identifiability of the pollution's origin.

Which of the following is the clearest example of a point source of pollution?

A) Runoff from a city's streets and parking lots after a rainstorm.

B) A smokestack at a coal-burning power plant.

C) Salt washing off roads in a large metropolitan area during winter.

D) Pesticides carried by the wind from a large agricultural region.

Correct Answer: B

The content explicitly lists a 'smokestack' as an example of a single, identifiable point source of pollution. The other options describe diffused, nonpoint sources.

Which of the following scenarios describes a nonpoint source of pollution?

A) A leaking underground storage tank at a specific gas station.

B) A pipe discharging treated sewage from a water treatment facility.

C) Oil, gasoline, and antifreeze washing off a large urban highway system during a storm.

D) A specific factory smokestack emitting sulfur dioxide.

Correct Answer: C

The content identifies 'urban runoff' as a nonpoint source. Pollutants washing off a large, diffuse area like a highway system fits this description. The other options are all single, identifiable point sources.

A key challenge in managing and regulating nonpoint source pollution, as suggested by the provided text, is that...

A) the pollutants involved are often less harmful than those from point sources.

B) the sources are typically located in remote, inaccessible areas.

C) the pollutants only affect a very small, localized ecosystem.

D) it is difficult to trace the pollution back to a single, specific origin.

Correct Answer: D

The text states that nonpoint sources are 'diffused and can therefore be difficult to identify.' This difficulty in identification makes it challenging to assign responsibility and regulate the pollution, which is a direct inference from the definition.

An environmental agency is attempting to reduce pollution in a watershed. They find it easier to set limits for a local factory's discharge pipe than to control the sediment washing from a large, deforested hillside. This difference in regulatory ease is primarily because the factory is a...

A) nonpoint source, while the hillside is a point source.

B) point source, while the hillside runoff is a nonpoint source.

C) more significant polluter than the hillside.

D) source of urban runoff, while the hillside is a source of pesticide spraying.

Correct Answer: B

The factory's discharge pipe is a single, identifiable origin, making it a point source. The sediment washing from a large, diffuse hillside is a nonpoint source. It is generally easier to regulate point sources because their origin is clear, as implied by the definitions provided.