Which of the following are physical characteristics of municipal sewage commonly assessed during preliminary examination?

Introduction / Context:
Characterizing sewage involves physical, chemical, and biological parameters. Physical characteristics provide quick diagnostic indicators of condition and treatment needs.

Given Data / Assumptions:

• Municipal sewage at plant inlet.
• Standard physical observations: appearance, smell, and temperature.

Concept / Approach:
Physical assessments help identify septicity (odour), solids load (turbidity), dye/industrial influence (colour), and process performance implications (temperature affects reaction rates and viscosity).

Step-by-Step Solution:
Confirm each parameter is a recognized physical characteristic: turbidity, colour, odour, temperature.Select the consolidated option covering all such characteristics.

Verification / Alternative check:
Introductory wastewater texts list these as standard physical indicators alongside settleable solids observations (e.g., Imhoff cone for settleables).

Why Other Options Are Wrong:

• Single-parameter choices omit others that are equally standard.

Common Pitfalls:
Confusing physical with chemical parameters (e.g., pH, alkalinity, BOD are not physical).

Final Answer:
All of the above