Tag: sewage treatment

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Questions Related to sewage treatment

Multiple choice biology wastewater story sewage treatment wastewater treatment - need and methods conservation

The soil pores block and become ineffective in filtering the water due to 

  1. Disposal of oil in drainage pipe.

  2. Disposal of oil in open drain.

  3. Disposal of oil in garden.

  4. None of the above.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Oil and fats can clog the drains reducing its effectiveness in filtering water. In open drains, they block the pores in the soil and thus hamper the filtration by soil. Hence, oil and fats should not be released into the drain.

So, the correct answer is 'Disposal of oil in open drain'.

Multiple choice biology wastewater story sewage treatment wastewater treatment - need and methods conservation

Sheela's teacher said in her classroom that we should not dispose of motor oils and medicines in the drain. Why did her teacher say this statement?

  1. Motor oil and medicine allows the bacteria to grow.

  2. Motor oil and medicine hamper the degradation process.

  3. Motor oil and medicine blocks the soil pores.

  4. None of the above.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Sheela's teacher said in her classroom that we should not dispose of motor oils and medicines in the drain because Motor oil and medicine hamper(prevent) the degradation process.
  • Chemicals present in motor oil and medicine kill the microbes that facilitate degradation process.so do not throw them down the drain.
  • So, the correct answer is 'Motor oil and medicine hamper(prevent) the degradation process.'.
Multiple choice biology wastewater story sewage treatment wastewater treatment - need and methods conservation

Which of the following can kill water purifying microbes?

  1. Paints

  2. Cooking oils

  3. Vegetable peels

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • The chemical present in paints, Solvents, Insecticides, motor oils, medicines may kill microbes that help purify water. So do not throw them down the drain.
  • Hence Paints can kill water purifying microbes.
  • So, the correct answer is 'Paints'.
Multiple choice biology wastewater story sewage treatment wastewater treatment - need and methods conservation

Cooking oil should not be thrown down the drain because

  1. They do not allow free flow of oxygen.

  2. They do not allow bacteria to decompose waste.

  3. They block the drainage pipes.

  4. None of the above.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • All the cooking oils should not be thrown in drains because it can harden and block the pipes. In an open drain, the fats clog the soil pores reducing its effectiveness in filtering water. 
  • Throw oil and fats in the dustbin.
  • Hence Cooking oil should not be thrown down the drain because they block the drainage pipes.
  • So, the correct answer is 'They block the drainage pipes'.
Multiple choice biology wastewater story sewage treatment wastewater treatment - need and methods conservation

Drains get blocked by 

  1. Oil and tea leaves.

  2. Oil and chemicals.

  3. Chemicals and soil.

  4. Chemicals and water.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Cooking oil and fats should not be thrown down the drain. They can harden and block the pipes. In an open drain, the fats clog the soil pores reducing its effectiveness in filtering water. Throw oil and fats in the dustbin. Chemicals like paints, solvents, insecticides, motor oil, medicines may kill microbes that help purify water. So do not throw them down the drain.


So, the correct answer is ''Oil and chemicals.