6The acceptable pH range of drinking water (BIS) is:A6.5–8.5B1–3C4–5D9–11View AnswerDiscussWorkspaceReportSaveEasy
7Chlorination of water is done for:ADisinfectionBAdding mineralsCRemoving hardnessDRemoving colour onlyView AnswerDiscussWorkspaceReportSaveEasy
8A town of 50,000 people with demand 150 L per person per day needs a daily supply of:A7.5 million litresB3,333 litresC750,000 litresD75 million litresView AnswerDiscussWorkspaceReportSaveMedium
9Temporary hardness is removed by:AAerationBFiltrationCChlorinationDBoilingView AnswerDiscussWorkspaceReportSaveEasy
10The grid-iron distribution system:AHas dead endsBIs only for villagesCHas interconnected pipes so water reaches points from several directionsDUses one pipeView AnswerDiscussWorkspaceReportSaveEasy