Red Seal Plumbing Practice Exam

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Study for the Red Seal Plumbing Exam. Engage with interactive quizzes and multiple-choice questions designed to help you master the essential plumbing concepts. Equip yourself for success on your credentialing exam!

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'Parts per million' in water analysis refers to how many ___________ of a substance in one litre of water.

Micrograms
Millilitres
Milligrams
Grams

The correct answer is: Milligrams

"Parts per million" refers to the amount of a particular substance in a specific volume of water. Specifically, it means the number of particles of the substance present in one million units of water. Therefore, the options of micrograms, millilitres, and grams are not correct as they are either units of weight or volume, and do not accurately represent the concentration of a substance in a given volume of water. The option of milligrams is also incorrect as it is a unit of weight and does not accurately represent the ratio of particles to water. Therefore, the correct answer is C, as milligrams is the accurate unit to express the concentration of a substance in water for the given scenario.