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Recycling - class-VIII

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In ...................... strategy for saving the environment, things are used again and again.

  1. Reuse

  2. Invent

  3. Both A and B

  4. None of the above


Correct Option: A
Explanation:

In reuse strategy for saving the environment, things are used again and again. Many items found around the home can be used for different purposes. So before you throw those items away, think about how they can be reused.

Which one is recyclable waste?

  1. Paper

  2. Torn clothes

  3. Metallic and plastic discards

  4. All the above


Correct Option: D
Explanation:
Recyclable wastes can be reused into new materials. For example, paper can be recycled and this will reduce deforestation because the paper is made from wood pulp. Torn clothes can be recycled to form bags and into other usable forms. Metallic and plastic discards can be melted and recycled into usable forms any number of times. Recycling reduces environmental pollution and uses less energy as compared to the production of new materials from raw materials.
Hence, all the options are correct.
So, the correct answer is 'All the above'.

Which one of the following can be recycled?

  1. Household waste

  2. Paper

  3. Plastic

  4. All of the above


Correct Option: B
Explanation:

Paper is waste that can be easily recycled. Used paper can be collected, out into machines and used as the paper again. This can greatly reduce the number of trees being cut for making paper. A lot of time, energy and money are also saved in this process. So, paper recycling should be carried out more often.

Thus, option B " Paper" is the correct answer.

Ways by which you can save paper is

  1. Collect used paper and recycle it

  2. Spread awareness about e-waste

  3. Spread awareness about the importance of soil

  4. All of the above


Correct Option: A
Explanation:

About 80,000-1,60,000 trees are cut down daily to make up to the need of paper products worldwide. Recycling of paper is the process wherein used paper is converted into a resuable form. Recyling has many benifits:

  • It heps save trees from cutting down.
  • Saves tons of water used in making fresh new virgin trees. Since recycling of paper requires less water.
  • Saves electricity usage. Since recycling of paper consumes less electrical power.
Thus collecting waste paper and recycling it helps save trees and paper.

To minimise garbage we should

  1. Recycle paper

  2. Use vermicomposting at home and deal with our kitchen waste

  3. Insist on the use of paper bags

  4. All of the above


Correct Option: D
Explanation:
  • The paper can be recycled in order to minimize waste production.
  • Vermicomposting is the process in which the earthworms are used for the breakdown of the organic matter and production of compost. 
  • The paper bags are biodegradable and recyclable materials and so the use of these materials should be increased. 
Thus, the correct answer is option D. 

During recycling of paper, paper is broken down into

  1. Cellulose

  2. Plastic

  3. Screens

  4. All of the above


Correct Option: A
Explanation:

The process of waste paper recycling involves mixing of used paper with water and chemicals to break it down. It is then chopped  and heated, which breaks it down further into strands of cellulose, a type of organic plant material; this resulting mixture is called as pulp or slurry. It is strained through screens, which remove any glue or plastic that may still be in the mixture then cleaned, de-inked, bleached, and mixed with water. Then it can be made into new recycled paper or other products.

So, the correct answer is 'Cellulose'

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

  1. 50%

  2. 10%

  3. 95%

  4. 5%


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

  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


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

  1. Newspapers

  2. Magazines

  3. Carbon papers

  4. Catalogues


Correct Option: C

Newspaper is considered as a lower grade paper because

  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


Correct Option: B

Recycling of paper can save

  1. 60% of coal

  2. 10% of coal

  3. 43% of water

  4. 20% of energy


Correct Option: A

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

  1. Grinder

  2. Pulper

  3. Incinerator

  4. None of the above


Correct Option: B

Which of the following categorizes papers in different grade?

  1. EPA

  2. WHO

  3. IUCN

  4. None of the above


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

  1. Environmental benefits

  2. Economic benefits

  3. None of the above

  4. Both A and B


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?

  1. Surfactant

  2. Oxygen

  3. Carbon chloride

  4. None of the above


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

  1. New paper

  2. Paper bag

  3. Plastics

  4. Both A and B


Correct Option: D

Sheela make a paste of paper from her old note books. But she wants to make colourful paper. What she will used to make paper colourfull?

  1. Paints

  2. Edible colour

  3. Colourfull paper

  4. Both B and C


Correct Option: D

Which of the following paper cannot be recycled?

  1. Old newspaper

  2. Note book

  3. Magazine

  4. Plastic coated paper


Correct Option: D

Flower petals can be used to give colour to the

  1. Paper

  2. Plastics

  3. Water

  4. Food


Correct Option: A

Paper is made up of

  1. Animal

  2. Plant

  3. Chemicals

  4. None of the above


Correct Option: B

Putrescible organic waste are included in

  1. Combustible Waste

  2. Non Combustible Rubbish

  3. Rubbish

  4. Garbage


Correct Option: D

Select the correct sequence of the process of paper recycling.

  1. Collection, sorting, pulping, deinking

  2. Collection, pulping, sorting, deinking

  3. Collection, deinking, sorting, pulping

  4. Deinking, sorting, pulping


Correct Option: A
Explanation:

Paper, torn clothes and metallic and plastic discards are recyclable wastes. Recycling is processing used materials (waste) into new, useful products. This is done to reduce the use of raw materials that would have been used. Paper recycling is a process wherein, a paper that is used, discarded by the consumer, is collected and transported to paper mills. Here, it is sorted and is mixed with water and chemicals and converted into paper pulp. Deinking is carried out to remove printing ink from the paper fibers from the pulp and transformed into reusable form.

Thus, the correct answer is option A.

Which of the following human activity can maintain the biological equilibrium?

  1. Poaching endangered animals

  2. Recycling of paper

  3. Deforestation

  4. None of the above


Correct Option: B
Explanation:

Recycling is the process by which the product is recycled and made available to use again. The recycling of paper not only saves valuable space in our landfills, but it also helps reduce greenhouse gas emissions and when one recycle, one also have to use fewer resources like water and energy to turn that item into another usable item. If the paper is recycled, fewer trees will be cut down for paper pulp. This will help to maintain the biological equilibrium in the ecosystem.

Thus, the correct answer is option B. 

Carbon chloride is used in

  1. Bleaching of new paper

  2. Bleaching of recycled paper

  3. Bleaching of clothes

  4. None of the above


Correct Option: B

The process of conversion of paper material into the slurry substance is called as

  1. Sorting

  2. Shredding

  3. Pulping

  4. None of the above


Correct Option: C
Explanation:

The process of waste paper recycling involves mixing of used paper with water and chemicals to break it down. It is then chopped up and heated, which breaks down the paper further into strands of cellulose, a type of organic plant material. This resulting mixture is called as pulp or slurry. This process is called as pulping. 

Thus, the correct answer is option C.  

Recycling 1 ton of paper saves

  1. 7000 gallons of water

  2. 17 trees

  3. Both A and B

  4. none of the above


Correct Option: C
Explanation:

During the production of paper from the wood pulp, about 7000 gallons of water is used. If the paper is recycled, then this large amount of water can be saved. Studies have proven that one ton of paper is equivalent to seventeen fully grown trees. The paper is made from wood pulp. The trees are cut down for making paper. By saving and recycling of the paper, we can help to prevent deforestation. 

Thus, the correct answer is option C. 

The common bleaching agent of recycled paper is

  1. Hydrogen peroxide

  2. Sodium hydrosulfite

  3. Chlorine

  4. Both A and B


Correct Option: C
Explanation:
Paper recycling is a process wherein, the paper that is used, discarded by the consumer, is collected and transported to paper mills. The papers are mixed with water and chemicals, broken down, converted into paper pulp and transformed into reusable form. The pulp which is obtained is colored and bleaching is performed to remove the color. The chemicals which are used for bleaching are hydrogen peroxide, sodium hydrosulfite or sodium dithionite. These chemicals helps in deinking of the pulp and increasing brightness. 
Thus, the correct answer is option D.

During paper recycling, .......... is used to bleach pulp.

  1. Bleaching powder

  2. Hydrogen peroxide

  3. Water

  4. None of the above


Correct Option: B
Explanation:

Paper recycling is a process wherein, the paper that is used, discarded by the consumer, is collected and transported to paper mills. The papers are mixed with water and chemicals, broken down, converted into paper pulp and transformed into reusable form. The pulp is colored and bleaching is performed to remove the color. The chemicals which are used for bleaching are hydrogen peroxide, sodium hydrosulfite or sodium dithionite. These chemicals help in deinking of the pulp and increasing brightness. 

Thus, the correct answer is option B. 

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