Tag: plastic

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Multiple choice chemistry man made materials environmental impact: plastics plastic plastic plastic waste garbage in, garbage out
Telephone instruments, plastic toys, ball point pens, plastic bowls are examples of:

  1. Thermoplastics

  2. Thermosetting plastic

  3. Polyester

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

 Telephone instruments, plastic toys, ball point pens, plastic bowls  are thermoplastics and so can be recycled.
Cooker handles, carry bags, plastic covering on electric wire, plastic chains etc are thermosetting plastics and so cannot be recycled.

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.