Q1: In sewage, the solids in mg per litre is

ANS:B - 500 to 1000

the range of 500 to 1000 mg per liter for solids in sewage. Sewage typically contains various types of solids, including suspended solids, dissolved solids, and settleable solids. These solids consist of organic and inorganic matter, such as debris, sediment, bacteria, and organic compounds. In some cases, especially in areas with higher levels of industrial or residential activity, the concentration of solids in sewage can be higher. Factors such as population density, industrial discharge, and the efficiency of sewage treatment systems can contribute to higher concentrations of solids. The range of 500 to 1000 mg per liter represents a higher concentration of solids in sewage compared to the typical range of 100 to 500 mg per liter. Sewage with concentrations in this range may indicate higher levels of organic and inorganic matter, potentially requiring more intensive treatment processes to remove contaminants and reduce environmental impact. Overall, the range of 500 to 1000 mg per liter for solids in sewage signifies a higher level of pollution and may require more advanced treatment methods to ensure effective sewage treatment and environmental protection.