Q1: The asbestos cement sewers are

ANS:D - All the above.

1. Light in weight: Asbestos cement pipes are relatively lightweight compared to other materials such as concrete or cast iron. This characteristic makes them easier to handle and install, reducing labor and transportation costs.
2. Not structurally strong to bear large compressive stress: While asbestos cement pipes are durable and have good structural strength under normal operating conditions, they are not as strong as materials like concrete or steel. They may be susceptible to damage if subjected to large compressive stresses, such as heavy loads or external pressure.
3. Susceptible to corrosion by sulphuric acid: Asbestos cement pipes can be susceptible to chemical degradation, particularly by strong acids such as sulphuric acid. Over time, exposure to acidic wastewater or soil conditions can lead to the deterioration of the cement matrix, potentially causing leaks or structural failures.