Tag: recycling

Questions Related to recycling

......... of paper is made up of trees.

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  1. 50%

  2. 10%

  3. 95%

  4. 5%

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Correct Option: C
Explanation:

Paper is made from the cellulose fibres which are obtained from the wood of the trees. The cellulose fibres are converted to pulp. This pulp is treated with various chemicals and then dried to form the sheets of paper. There are substances like lignin in the wood of trees which results in the paper to become yellow and brittle over some time. So, the yield from the trees for paper production is about 95%. 

Thus, the correct answer is option C. 

Every ton of paper recycled saves

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  1. More than 3.3 cubic yards of landfills

  2. Less than 3.3 cubic yards of landfills

  3. Garden

  4. None of the above

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Correct Option: A
Explanation:
Every ton of paper recycled saves more than 3.3 cubic yards of landfill space, and if measured by weight, more paper is recovered for recycling than plastic, aluminum, and glass combined. And according to EPA, by recycling one ton of paper 17 trees, 7,000 gallons of water and 463 gallons of oil can be saved.
So, the correct answer is option A.

All of the following papers can be recycled except

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  1. Newspapers

  2. Magazines

  3. Carbon papers

  4. Catalogues

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Correct Option: C

Newspaper is considered as a lower grade paper because

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  1. It cannot be recycled

  2. It has been already recycled numerous times

  3. It contains less amount of cellulose

  4. It contains large amount of cellulose

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Correct Option: B

Recycling of paper can save

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  1. 60% of coal

  2. 10% of coal

  3. 43% of water

  4. 20% of energy

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Correct Option: A

The paper is tossed in .......... during the paper recycling process.

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  1. Grinder

  2. Pulper

  3. Incinerator

  4. None of the above

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Correct Option: B

Which of the following categorizes papers in different grade?

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  1. EPA

  2. WHO

  3. IUCN

  4. None of the above

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Correct Option: A
Explanation:

EPA also known as Environmental Protection Agency categorizes papers in five different grades. These are old corrugated containers, mixed paper, old newspapers, high grade deinked paper, pulp substitutes.

So, the correct answer is option A. 

Recycling of material provides

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  1. Environmental benefits

  2. Economic benefits

  3. None of the above

  4. Both A and B

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Correct Option: D
Explanation:
Recycling is the process of collecting and processing materials that would otherwise be thrown away as trash and turning them into new products. It provides various benefits.
Economic benefits:
  • It saves money.
  • It creates jobs and generates revenue.
  • It acts as a promising industry.
Environmental benefits:
  • It reduces pollution because trash isn’t being burned and manufacturers can reuse materials instead of creating new ones which are more energy efficient.
  • It conserves natural resources such as timber, water, and mineral.
  • It reduces greenhouse gas emissions that contribute to global climate change.
  • It leads to sustain the environment for future generations.
So, the correct answer is option D.

Which of the following is used for deinking of papers?

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  1. Surfactant

  2. Oxygen

  3. Carbon chloride

  4. None of the above

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Correct Option: A
Explanation:
Deinking is a very critical step in the manufacturing of paper or board from recycled paper or board. In this process, printing ink, dirt, and specks are removed from the fibres. It is done with a combination of mechanical action and chemicals added into the pulper and at flotation which involves the use of surfactants to ensure the detachment of ink from the fibres.
Generally, the amount of surfactant used is about 0.025-0.25%
So, the correct answer is option A.

Old newspapers can be recycled into

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  1. New paper

  2. Paper bag

  3. Plastics

  4. Both A and B

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Correct Option: D