Tag: man made materials

Questions Related to man made materials

Which of the following takes so many years to degrade?

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  1. Jute

  2. Cotton

  3. Wool

  4. Plastic

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Correct Option: D
Explanation:
Non-biodegradable materials are not degraded by natural factors such as micro-organisms such as bacteria, UV radiations etc. They stay longer and difficult to degrade.
Jute, cotton and wool are made from natural fibre and are therefore biodegradable while plastic is a synthetic polymer and is non-biodegradable waste.
option D isc orrect

We come to a conclusion, that plastics are bad conductors of electricity from the followings:

chemistry man made materials environmental impact: plastics plastic plastic plastic waste garbage in, garbage out

  1. Refrigerators and freezers have a plastic foam core.

  2. Electrical wires have a plastic covering.

  3. Cooking pans have plastic handles.

  4. It is used to prepare parachutes.

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Correct Option: B

Which of the following substance is bio-degradable?

chemistry man made materials environmental impact: plastics plastic plastic plastic waste garbage in, garbage out

  1. cloth

  2. thermosetting plastic

  3. thermoplastic

  4. PVC pipes

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Correct Option: A
Explanation:
Biodegradable wastes are such waste materials which are and can be degraded by natural factors like microbes (e.g. bacteria, fungi and few more), abiotic elements like temperature, UV, oxygen, etc. Example: kitchen wastes and other natural wastes. Cloth is a natural polymer made from cellulose, cotton, silk, wool etc and is biodegradable while plastics (thermoplastic, thermosetting plastics, PVC) are synthetic polymers and are non-biodegradable
option A is correct

These processes can be used to prevent health hazards of plastics :

chemistry man made materials environmental impact: plastics plastic plastic plastic waste garbage in, garbage out

  1. Reduce

  2. Reuse

  3. Recover

  4. Recycle

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Correct Option: A,B,C,D
Explanation:

 

A number of waste prevention techniques are available, and they are commonly summarized as the so-called 4Rs: reduction, reuse, recycling and recovery. 

Reduction, reuse and recycling are known in the industry as the 3Rs. 

We must reduce the use of resources as much as possible and save them for the future generation. Reducing usage is a method of conservation of resources.

Therefore, A, B, C and D option are correct.

Burning of plastic causes:

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  1. water pollution

  2. air pollution

  3. sound pollution

  4. All of these

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Correct Option: B
Explanation:

Burning of plastic produces carbon dioxide which causes heavy air pollution. 

Like synthetic fibres, plastic is also a:

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  1. polymer

  2. polythene

  3. polycot

  4. acrylic

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Correct Option: A

What are the two types of arrangement in plastics ?

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  1. Linear, Horizontal

  2. Horizontal, Cross-linked

  3. Linear, Cross-linked

  4. Linear, Vertical

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Correct Option: C

Which of the following statement is true about PVC (polyvinyl chloride) and polythene?

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  1. They are thermoplastics

  2. They are thermosetting plastics

  3. They are examples of natural substances

  4. They are natural fibres

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Correct Option: A
Explanation:

Thermoplastics on heating get deformed (its shape and size can be altered) and thus can also be bent. On the other hand, thermosetting plastics cannot be bent once moulded. Some examples of Thermoplastics are – Polythene and PVC. Some examples of Thermosetting plastics are – Bakelite and Melamine.


Hence, the correct option is $\text{A}$

A material which is not easily decomposed by natural processes is termed as :

chemistry man made materials environmental impact: plastics plastic plastic plastic waste garbage in, garbage out

  1. biodegradable material

  2. non-biodegradable material

  3. recycled material

  4. natural material

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Correct Option: B
Explanation:

A material which is not easily decomposed by natural processes is termed as $\text {non-biodegradable material}$. Examples are polyethene, PVC, PS. It takes many years for decomposition. Hence, option B is correct.

Which of the following are uses of plastics in health care industry?

chemistry man made materials environmental impact: plastics plastic plastic plastic waste garbage in, garbage out

  1. Packaging of tablets

  2. Stitching wounds

  3. Syringes

  4. All of the above

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Correct Option: D
Explanation:

Plastics in health care industry are used in packaging of medicines;plastic threads are used for stitching wounds. Also syringes, gloves and many kind of medical instruments are made up of plastic.