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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What does mass balance measure?
💡 Hint: Think about what happens when something is added or removed.
Question 2
Easy
Define a well-mixed lake.
💡 Hint: How does mixing affect concentration?
Practice 4 more questions and get performance evaluation
Interactive Quizzes
Engage in quick quizzes to reinforce what you've learned and check your comprehension.
Question 1
What is the main purpose of the mass balance equation?
- To calculate temperature changes
- To analyze pollutant concentration changes
- To determine water flow rates
💡 Hint: Think about what mass balance concerns in environmental science.
Question 2
True or False: A steady state means concentration levels fluctuate over time.
- True
- False
💡 Hint: What does steady state imply regarding input and output?
Solve 2 more questions and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
A lake receives runoff from a nearby agricultural field that contains pollutants. After a significant rain, the concentration of a specific pollutant increases by 25%. How would you set up the mass balance to estimate the new concentration?
💡 Hint: Consider how the prior concentration plus the influx changes the overall balance.
Question 2
In a simplified box model of a lake, water flows in at a rate of 10 cubic meters per hour, and pollutants enter at a concentration of 5 mg/L. If the outflow is constant, and evaporation removes pollutants, how would you calculate the pollutant concentration after one hour?
💡 Hint: Ensure you're considering both the inflow and outflow rates.
Challenge and get performance evaluation