Ontario Operator-in-Training (OIT) Practice Exam

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Study for the Ontario Operator-in-Training (OIT) Test. Use flashcards and multiple-choice questions for preparation, with hints and explanations for each. Get ready for your exam!

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A sample with a high BOD level indicates what?

  1. Low organic material content

  2. High organic material content

  3. Stable chemical composition

  4. Presence of inorganic substances

The correct answer is: High organic material content

A sample with a high Biochemical Oxygen Demand (BOD) level indicates a high organic material content. BOD measures the amount of oxygen that microorganisms will consume while decomposing organic matter in water. A high BOD level suggests that there is a significant presence of organic material available for the microorganisms to break down. This is often associated with higher levels of pollutants or waste, such as sewage or decaying plant and animal matter. In context, the other choices represent alternative conditions unrelated to the implications of BOD. Low organic material content would be indicated by a low BOD, while stable chemical composition and the presence of inorganic substances do not directly correlate with high BOD readings, which are specifically tied to organic matter and its decomposition by microorganisms.

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