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Three statements are provided here which define the terms – (a) sludge (b) sewage and (c) wastewater. Pick out the correct definition for each of these terms. (a) The settled solids that are removed in wastewater treatment with a scraper. (b) Water from the kitchen used for washing dishes. (c) Wastewater released from homes, industries, hospitals and other public buildings.

a) The settled solids that are removed in wastewater treatment with a scraper. Explanation Sludge – It is the collection... View Article

Given below is a jumbled sequence of the processes involved in a wastewater treatment plant. Arrange them in their correct sequence. (a) Sludge is scraped out and skimmer removes the floating grease. (b) Water is made to settle in a large tank with a slope in the middle. (c) Large objects like plastic bags are removed by passing wastewater through bar screens. (d) Sand, grit and pebbles are made to settle by decreasing the speed of incoming wastewater. (e) Wastewater enters a grit and sand removal tank.

The major aim of wastewater treatment is to remove as much of the suspended solids as possible before the remaining... View Article

Why should we not throw (a) used tea leaves into the sink? (b) cooking oil and fats down the drain?

a) We should not throw used tea leaves into sink as it chokes the drain and do not allow free... View Article

A man travelling in a train threw an empty packet of food on the platform. Do you think this is a proper waste disposal method? Elaborate.

This is not a proper waste disposal method. We should throw the empty packets into proper dustbins. Generally, these empty... View Article

Name two alternative arrangements for sewage disposal where there is no sewerage system.

Two alternative arrangements for sewage disposal where there is no sewerage system- The low cost on-site sanitation systems can be... View Article

Animal waste, oil and urea are some of the organic impurities present in sewage. Name two more organic impurities present in sewage.

There are both organic and inorganic impurities present in the sewage. Organic impurities present in sewage are- (I). Vegetable and... View Article

Name two inorganic impurities present in sewage.

Two inorganic impurities present in sewage are nitrates and phosphates. Explanation Sewage is the wastewater released by hospitals, homes or... View Article

How are open drains harmful to human health?

An open-drain is mostly used to collect wastewater that is not sewage. Use of open drains to dispose of sanitary... View Article

State whether the following statement is True or False. In case a statement is false, write the correct statement.Where underground sewerage systems and refuse disposal systems are not available, the high-cost on-site sanitation system can be adopted.

False Explanation The low cost on-site sanitation systems can be adopted when the underground sewerage systems and refuse disposal system... View Article

State whether the following statement is True or False. In case a statement is false, write the correct statement.Wastewater could be reused.

True Explanation Wastewater can be treated using wastewater treatment plant and used for drinking, washing, etc. again. Use the water... View Article

State whether the following statement is True or False. In case a statement is false, write the correct statement. Used water is wastewater.

True Explanation Water that has been used once is considered as waste water. Water is used for almost every activity. This... View Article

State whether the following statement is True or False. In case a statement is false, write the correct statement. (a) Sewage is a solid waste which causes water pollution and soil pollution.

False Explanation Sewage is actually the wastewater that is released from houses, hospitals, industries, offices and other sources. It also... View Article

Why are open drains a concern?

Mosquitoes fly mostly breed in dirty water or areas and in open water. Open drains are dirty and have wastes... View Article

Which of the following is not a source of wastewater? (a) Sewers (b) Homes (c) Industries (d) Hospitals

a) Sewers Explanation The pipes through which the wastewater flows into the sewage are known as sewers, whereas, wastewater is collected... View Article

In a filtration, plant water is filtered using layers of (a) sand and clay. (b) clay and fine gravel. (c) sand and fine gravel. (d) sand, fine gravel and medium gravel.

(d) sand, fine gravel and medium gravel. Explanation The sand, fine gravel and the medium gravels are used to filter... View Article

Which of the following is a part of inorganic impurities of the sewage? (a) Pesticides (b) Urea (c) Phosphates (d) Vegetable waste

c) Phosphates Explanation Phosphate or phosphorus is an inorganic component and hence, it is considered an inorganic impurity in sewage.... View Article

The system of a network of pipes used for taking away wastewater from homes or public buildings to the treatment plant is known as (a) sewers. (b) sewerage. (c) transport system. (d) treatment plant.

b) Sewerage Explanation Sewerage is the system applied in buildings for discharging wastewater to the sewage. It is a network... View Article

Pick from the following one chemical used to disinfect water. (a) Chlorine (b) Washing soda (c) Silica (d) Coal

a) Chlorine Explanation Chlorine is a very good oxidizer. It kill pathogens and germs by breaking their bonds. This is... View Article

Water polluted by various human activities causes a number of water-borne diseases. Which of the following is not a waterborne disease? (a) Cholera (b) Typhoid (c) Asthma (d) Dysentry

C) Asthma Explanation Asthma is a respiratory disorder in which a patient is allergic to allergens present in air like... View Article

An open-drain system is a breeding place for which of the following. (a) Flies (b) Mosquitoes (c) Organisms which cause diseases (d) All of these

d) All of these Explanation Open drain systems are a breeding place for different flies, mosquitoes, and other disease causing... View Article

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