Water Pollution

Q. Explain the function of bar screens in a wastewater treatment plant.

Q.

Question 6.

Explain how wastewater treatment plant works?

Q.

Oral Rehydration Solution (ORS) should be given to the patient who experiences:

1. 
   

   Cholera

2. 
   

   Indigestion

3. 
   

   Diarrhea

4. 
   

   Jaundice

Q.

Anjali took sand, red soil, gravel and soil from a forest in four test tubes. She then poured hydrogen peroxide into each test tube. Which test tube will produce the highest effervescence?

1. Test tube with gravel.

2. Test tube with red soil.

3. Test tube with forest soil.

4. Test tube with sand.

Q.

Name the three processes involved in the treatment of wastewater.

Q.

Define water pollution.

Q. Mark “T” if the statement is true and “F” if it is false.​

(i) The freshwater stored in the ground is much more than that present in the rivers and lakes of the world. (T/F)​
(ii) Water shortage is a problem faced only by people living in rural areas. (T/F)
(iii) Water from rivers is the only source for irrigation in the fields. (T/F)
(iv) Rain is the ultimate source of water. (T/F)

Q.

Waste water contains which of the following kinds of impurities?

1. Dissolved impurities

2. Undissolved impurities

3. Non – biodegradable impurities

4. All of the above

Q. Which of the following factors is responsible for polluting river water?

1. Releasing treated waste into rivers
2. Frequent flooding
3. Dumping industrial waste into rivers
4. Releasing disinfected water into river

Q.

Factories, power plants, oil wells, etc. are called non-point sources of water pollution

1. True
2. False

Q.

Which of the following is not a main cause of pollution in rivers like the Ganga ?

1. Releasing untreated sewage into rivers

2. Pesticide and fertilizer run off from farms

3. All of the above

4. Industries dumping wastes into rivers

Q. Which of the following is not a source of wastewater?

1. Domestic waste
2. Water wells
3. Industrial waste
4. Hospital waste

Q.

Which of the following pair is not the source of fresh water?

1. Glaciers and icebergs

2. Lakes and rivers

3. Ponds and groundwater

4. Seawater and ocean water

Q.

Which of these substances is/are present in impure water?

1. Dissolved impurities

2. Undissolved impurities

3. Non – biodegradable impurities

4. All of the above

Q. Which among the following processes does not involve the usage of water?

1. Bathing
2. Burning of wood
3. Washing clothes
4. Watering plants

Q.

Question 6.

Explain how wastewater treatment plant works?

Q.

25. Oil spills cause _____________

Q.

LIST OF POLLUTANTS IN THE PAVANA RIVER

Q.

Which of these substances is/are present in sewage?

1. Dissolved impurities

2. Undissolved impurities

3. Non – biodegradable impurities

4. Microorganisms

Q. Match each process in a wastewater treatment plant with the substance that gets removed during it.

1. Grit removal
2. Screening
3. Sedimentation
4. Plastic bags
5. Pebbles & sand
6. Sludge

Q. (a)Why is air passed through wastewater during wastewater treatment?
(b) How are impurities filtered during wastewater treatment?

Q. Statement I: Diarrhoea can cause death.
Statement II: Drinking polluted water can cause diarrhoeal diseases.

1. Statements I and II are true
2. Statements I and II are false
3. Statement I is true but II is false
4. Statement I is false but II is true

Q.

Oral Rehydration Solution (ORS) should be given to the patient who experiences:

1. 
   

   Cholera

2. 
   

   Indigestion

3. 
   

   Diarrhea

4. 
   

   Jaundice

Q. In a wastewater treatment plant, which of the following contaminants can be removed using a bar screen?

1. Oil and grease
2. Grit and pebbles
3. Cans and rags
4. Bacteria and faeces

Q. (I) Plastics are non-biodegradable and cause soil and water pollution
(II) The use of plastics should be avoided
Identify the correct option out of the following.

1. Both (I) and (II) are correct but (II) is not the correct explanation of (I)
2. Both are incorrect
3. Both (I) and (II) are correct and (II) is the correct explanation of (I)
4. (I) is incorrect and (II) is correct

Q. In a wastewater treatment plant, which of the following contaminants can be removed using a bar screen?

1. Oil and grease
2. Grit and pebbles
3. Cans and rags
4. Bacteria and faeces

Q. Which of the following is the last step in the wastewater treatment?

1. Screening
2. Chlorination
3. Segregation
4. Aeration

Q. Untreated human excreta is a health hazard. Explain.

Q. _____ is a network system of pipes that carry sewage from the households and industries to the wastewater treatment plant.

1. Sludge
2. Sewerage
3. Skimmer
4. Sewer

Q. Which of the following chemical is used to disinfect water in a wastewater treatment plant?

1. Oxygen
2. Chlorine
3. Hydrogen
4. Carbon dioxide