ENV 101 Exam 4 V3 | ENV 101
Environmental Science | StraighterLine |
Q&A with Rationale (StraighterLine
ENV101 Exam 4)
1. Which of the following describes the ‘cradle-to-grave’ approach mandated by the Resource
Conservation and Recovery Act (RCRA)?
A. It requires manufacturers to take back all products at the end of their life cycle.
B. It tracks hazardous waste from its point of generation to its ultimate disposal.
C. It focuses solely on the mining of raw materials for production.
D. It eliminates the need for landfills by promoting 100% recycling.
Answer: B
Rationale: The RCRA was established to manage hazardous waste throughout its entire
existence. This involves rigorous documentation and permitting for generators,
transporters, and disposal facilities. By tracking waste ‘cradle-to-grave,’ the EPA ensures
that materials do not disappear into the environment illegally.
2. What is the primary objective of the Comprehensive Environmental Response,
Compensation, and Liability Act (CERCLA)?
A. To regulate current industrial emissions into the atmosphere.
B. To provide funding for the cleanup of abandoned hazardous waste sites.
,C. To promote the use of renewable energy in urban centers.
D. To set standards for the quality of drinking water in municipal systems.
Answer: B
Rationale: CERCLA is commonly known as the Superfund program and was created in
response to disasters like Love Canal. It allows the federal government to identify parties
responsible for contamination and force them to pay for remediation. If no responsible
party can be found, the Superfund provides the necessary capital to clean up the site.
3. Which fossil fuel is considered the ‘cleanest’ burning because it releases the fewest
pollutants and least CO2 per unit of energy?
A. Anthracite coal
B. Natural gas
C. Bituminous coal
D. Crude oil
Answer: B
Rationale: Natural gas consists primarily of methane and produces significantly less
carbon dioxide compared to coal or oil. It also emits negligible amounts of sulfur dioxide
and particulate matter during combustion. However, methane leaks during extraction
remain a significant environmental concern regarding its total climate impact.
, 4. In a nuclear power plant, what is the function of the control rods?
A. To increase the temperature of the cooling water.
B. To provide the fuel necessary for the chain reaction.
C. To absorb neutrons and regulate the rate of the fission reaction.
D. To shield the environment from harmful gamma radiation.
Answer: C
Rationale: Control rods are made of materials like boron or cadmium that have a high
capacity for capturing neutrons. By moving these rods in and out of the reactor core,
operators can speed up or slow down the nuclear chain reaction. This mechanism is critical
for maintaining a steady output of energy and preventing a potential meltdown.
5. Which of the following is a major disadvantage of large-scale hydroelectric power?
A. High greenhouse gas emissions during operation.
B. Disruption of fish migration and loss of terrestrial habitats.
C. High cost of fuel required for energy production.
D. Intermittency of power generation during the night.
Answer: B
Rationale: Dams significantly alter the flow of rivers, which interferes with the
reproductive cycles of migratory species like salmon. The flooding of the reservoir area
Environmental Science | StraighterLine |
Q&A with Rationale (StraighterLine
ENV101 Exam 4)
1. Which of the following describes the ‘cradle-to-grave’ approach mandated by the Resource
Conservation and Recovery Act (RCRA)?
A. It requires manufacturers to take back all products at the end of their life cycle.
B. It tracks hazardous waste from its point of generation to its ultimate disposal.
C. It focuses solely on the mining of raw materials for production.
D. It eliminates the need for landfills by promoting 100% recycling.
Answer: B
Rationale: The RCRA was established to manage hazardous waste throughout its entire
existence. This involves rigorous documentation and permitting for generators,
transporters, and disposal facilities. By tracking waste ‘cradle-to-grave,’ the EPA ensures
that materials do not disappear into the environment illegally.
2. What is the primary objective of the Comprehensive Environmental Response,
Compensation, and Liability Act (CERCLA)?
A. To regulate current industrial emissions into the atmosphere.
B. To provide funding for the cleanup of abandoned hazardous waste sites.
,C. To promote the use of renewable energy in urban centers.
D. To set standards for the quality of drinking water in municipal systems.
Answer: B
Rationale: CERCLA is commonly known as the Superfund program and was created in
response to disasters like Love Canal. It allows the federal government to identify parties
responsible for contamination and force them to pay for remediation. If no responsible
party can be found, the Superfund provides the necessary capital to clean up the site.
3. Which fossil fuel is considered the ‘cleanest’ burning because it releases the fewest
pollutants and least CO2 per unit of energy?
A. Anthracite coal
B. Natural gas
C. Bituminous coal
D. Crude oil
Answer: B
Rationale: Natural gas consists primarily of methane and produces significantly less
carbon dioxide compared to coal or oil. It also emits negligible amounts of sulfur dioxide
and particulate matter during combustion. However, methane leaks during extraction
remain a significant environmental concern regarding its total climate impact.
, 4. In a nuclear power plant, what is the function of the control rods?
A. To increase the temperature of the cooling water.
B. To provide the fuel necessary for the chain reaction.
C. To absorb neutrons and regulate the rate of the fission reaction.
D. To shield the environment from harmful gamma radiation.
Answer: C
Rationale: Control rods are made of materials like boron or cadmium that have a high
capacity for capturing neutrons. By moving these rods in and out of the reactor core,
operators can speed up or slow down the nuclear chain reaction. This mechanism is critical
for maintaining a steady output of energy and preventing a potential meltdown.
5. Which of the following is a major disadvantage of large-scale hydroelectric power?
A. High greenhouse gas emissions during operation.
B. Disruption of fish migration and loss of terrestrial habitats.
C. High cost of fuel required for energy production.
D. Intermittency of power generation during the night.
Answer: B
Rationale: Dams significantly alter the flow of rivers, which interferes with the
reproductive cycles of migratory species like salmon. The flooding of the reservoir area
