Wastewater Story quiz

Liquid waste carried by drains is called:

Large objects like rags and plastic are removed at the:

In the aeration tank, air is pumped to help:

The gas produced from sludge by anaerobic bacteria is:

Which chemical is used to disinfect water?

Openings in sewers for workers to enter are called:

Which disease spreads through contaminated water?

Which of these should NOT be thrown in drains?

The trees planted along sewage ponds to absorb water are:

World Water Day is observed on:

Why is it important to treat sewage before releasing it into rivers? (2 marks)

What is the role of a skimmer in the clarifier? (2 marks)

Name two inorganic impurities in sewage. (2 marks)

Why is the grit and sand removal tank needed? (2 marks)

What is a vermi-processing toilet? (2 marks)

Why should chemicals like paints and insecticides not be poured down drains? (2 marks)

What is open defecation? Why is it harmful? (2 marks)

How does dried sludge help farmers? (2 marks)

Why should food scraps be put in a dustbin rather than the sink? (2 marks)

Name two places where chemical toilets are useful. (2 marks)

A family of 5 uses about 135 litres of water per person per day, and 80 percent becomes wastewater. Find the wastewater produced by the family each day. (3 marks)

Activated sludge is about 97 percent water. In 200 kg of activated sludge, how much is water and how much is solid? (3 marks)

A plant treats 120 million litres of sewage a day. If 1 percent of the volume settles as sludge, how many litres of sludge form daily? (3 marks)

A town has 40,000 houses. 28,000 are connected to sewers, 8,000 have septic tanks and the rest have no facility. Find the percentage in each group. (3 marks)

A digester gets 10 tonnes of sludge daily and produces about 20 cubic metres of biogas per tonne. How much biogas is produced in a week? (3 marks)

Read the passage and answer the questions. In a town without a treatment plant, sewage from homes flows directly into a river. Downstream, villagers use the river water for drinking and bathing. (i) What diseases might the villagers suffer from? (ii) What happens to fish in the river? (iii) What should the town do? (5 marks)

Read the passage and answer the questions. Boojho and Paheli visited a WWTP. They saw a huge tank where solid waste settled at the bottom and oil floated at the top. (i) Name this tank. (ii) What is the settled material called? (iii) What happens to the floating oil? (5 marks)

Read the passage and answer the questions. A restaurant poured used cooking oil into its sink every day. After some months, the drain pipe got blocked. (i) Why did the drain block? (ii) How should used oil be disposed of? (iii) How does oil harm the treatment process? (5 marks)

Read the passage and answer the questions. A hill village has no sewers. The panchayat built toilets with tanks where earthworms convert human waste into compost. (i) What are these toilets called? (ii) What is the product used for? (iii) Give one advantage over open defecation. (5 marks)

Read the passage and answer the questions. During a festival, thousands of people visited a fair. Mobile chemical toilets were placed at several points. (i) Why were chemical toilets used? (ii) How do they help sanitation? (iii) What is our responsibility in public places? (5 marks)

Describe the process of wastewater treatment at a WWTP with a labelled flowchart. (6 marks)

Explain the composition of sewage with examples of each type of contaminant and the diseases they can cause. (6 marks)

Explain "better housekeeping practices" to reduce pollution of wastewater with five examples. (6 marks)

Describe four on-site methods of sewage disposal with a labelled diagram of a septic tank. (6 marks)

Explain the importance of sanitation for public health. Suggest five steps students can take to keep their surroundings clean. (6 marks)