Q1: The following is the physical characteristic of sewage

ANS:E - all the above.

1. Turbidity: Turbidity refers to the cloudiness or haziness of a fluid caused by suspended solids that are invisible to the naked eye. In sewage, turbidity can indicate the presence of suspended particles, such as organic matter, sand, silt, or other debris.
2. Colour: The color of sewage can vary depending on its composition and the substances it contains. It can range from grayish to brownish hues, often reflecting the presence of organic matter, chemicals, or other contaminants.
3. Odour: Odour is another physical characteristic of sewage. Sewage typically emits a foul smell due to the decomposition of organic matter by bacteria and other microorganisms. The presence of certain gases, such as hydrogen sulfide, methane, and ammonia, contributes to the characteristic odor of sewage.
4. Temperature: Sewage temperature can vary depending on various factors, including ambient temperature, the source of the sewage, and the presence of industrial discharges. Warmer temperatures can accelerate biological processes in sewage treatment, while colder temperatures may slow down microbial activity.