Tag: environmental impact: plastics

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Questions Related to environmental impact: plastics

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

Which plastic is commonly used as carry bags?

  1. Polythene

  2. Polyester

  3. PET

  4. Acrylic
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Polyethylene is a thermoplastic polymer consisting of long hydrocarbon chains. Polyethylene or polythene is the most common plastic. Its primary use is in packaging (plastic bag, plastic films, containers including bottles, etc.).

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

Plastic is a polymer consisting of:

  1. synthetic monomers

  2. semi-synthetic monomers

  3. natural monomers

  4. both a and b
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Plastic is a material consisting of synthetic or semi-synthetic organics that can be moulded into solid objects of diverse shapes. Plastics are typically organic polymers of high molecular mass, but they often contain other substances. They are usually synthetic, most commonly derived from petrochemicals, but many are partially natural.

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

Which plastic is called a fire proof plastic?

  1. Melamine

  2. Bakelite

  3. Teflon

  4. Acrylic
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Melamine is poor conductor of heat and resists fire. Most of the synthetic fibres are poor conductors of heat and electricity. However, melamine is used as a coating on the uniforms of firemen as they are flame resistant.

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

Which of the following statement is true about thermosetting plastic?

  1. It undergoes irreversible change during curing

  2. It can melt and take shape only once

  3. It cannot be recycled

  4. All of above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Thermosetting plastics contain polymers that cross-link together during the curing process to form an irreversible chemical bond. It can't be recycled. The cross-linking process eliminates the risk of the product remelting when heat is applied, making thermosetting ideal for high-heat applications such as electronics and appliances.

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

Why is plastic used in covering of electrical appliances?

  1. Good conductors of heat and electricity

  2. Durable

  3. Poor conductors of heat and electricity

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

Plastic is a poor conductor of heat and electricity. 


This makes it suitable to make the covering of electric wires, handles of electrical appliances, handles of utensils, kitchenware, floor tiles, etc.

Hence the correct option is C.

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

The world's first fully synthetic plastic was:

  1. Polystyrene

  2. Nylon

  3. Bakelite

  4. Teflon
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The world's first fully synthetic plastic was bakelite, invented in New York in 1907 by Leo Baekeland who coined the term 'plastics'. Bakelite is made from carbolic acid (phenol) and formaldehyde and is referred to as a phenolic resin. Bakelite was the first thermosetting plastic.


Hence, the correct option is $C$

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

Which of the following are the advantages of plastic over metals?
1. Plastics are lighter.
2. Plastics are usually cheaper.
3. Plastics are inert to both acids and alkalis.

  1. (1) and (2) only

  2. (1) and (3) only

  3. (2) and (3) only

  4. (1) ,(2) and (3)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
With the increased knowledge of plastics and the improved capabilities of machining equipment, the industry is now capable of producing plastic components to the same exacting standards as metallic components.
Plastics can  provide the benefit of reduced weight. This is crucial for a manufacturer of aircraft parts, for instance, decreased weight means increased fuel efficiency. This has lead to manufacturers transitioning from aluminum and steel to plastic and composites.
Plastic are less sensitive to weather than metal, resisting corrosion and rust. In addition, additives can be introduced to protect the pieces from damaging UV rays.
Plastics are resistance to many more chemical compounds like acids and alkalis. This opens up the options for use in solution tanks.
Plastics can be designed for resist impact and dents, making it durable, strong, and stable.
Plastics have tighter tolerances.