Red Seal Plumbing Practice Exam

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What are cleansing or surface active agents known as?

Detergents
Emulsifiers
Surfactants
Disinfectants

The correct answer is: Surfactants

Cleansing or surface active agents are known as surfactants, or substances that have the ability to reduce the surface tension between two substances. Detergents (A) may contain surfactants, but not all detergents are considered surfactants. Emulsifiers (B) are substances that help to stabilize mixtures of two substances that typically do not mix well together, such as oil and water, and are not necessarily considered surfactants. Disinfectants (D) are used to kill or inhibit the growth of microorganisms, which is not the primary function of surfactants. While some disinfectants may contain surfactants, this is not the main purpose of their use. Therefore, the correct answer is C Surfactants.