CBSE Questions for Class 8 Chemistry Synthetic Fibres And Plastics Quiz 6 - MCQExams.com

Why is plastic used in covering of electrical appliances?
  • It is a good conductors of heat
  • It is a good conductor of electricity
  • It is a poor conductor of electricity
  • None of above
Which plastic is called a fire proof plastic?
  • Melamine
  • Bakelite
  • Teflon
  • Acrylic
Which of the following statement is true about thermosetting plastic?
  • It undergoes irreversible change during curing
  • It can melt and take shape only once
  • It cannot be recycled
  • All of above
Which of the following statement is false about plastic?
  • Low thermal conductivity
  • They are highly reactive
  • Low ductility
  • Combustible
Which of the following is considered as the first thermoplastic?
  • PVC
  • Polystyrene
  • Melamine
  • Celluloid
Plastic is a polymer consisting of:
  • synthetic monomers
  • semi-synthetic monomers
  • natural monomers
  • Both A and B
Which plastic is commonly used to make carry bags?
  • Polythene
  • Polyester
  • PET
  • Acrylic
Which of the following statement is true about non-biodegradable materials?
  • They are safe for environment
  • The wastes are made up of synthetic material
  • They can be constantly reused
  • The wastes are made up of natural ingredients
Why are plastics difficult to biodegrade?
  • They are not environment friendly
  • Burning process is slow
  • They release lot of poisonous fumes
  • All of above
Plastics are mainly used by everyone because :
  • They are cheap
  • Easy to handle
  • Do not break
  • Light weight
_____ waste products can also be called green waste, or organic waste.
  • Biodegradable
  • Non-Biodegradable
  • synthetic
  • None of these
What are biodegradable compounds?
  • Compounds which can not be decomposed
  • Compounds which can be decomposed by man-made processes
  • Compounds which can be decomposed by natural processes
  • All of the above
Handles of most pans are made up of ____.
  • metals
  • plastic
  • Both A and B
  • None of the above
Which of the following item cannot be recycled?
  • Plastic milk bottles
  • Plastic food trays
  • CD/DVD cases
  • Plastic cups
Plastic can be used as :
  • insulator
  • conductor
  • Both A and B
  • None of above
Cotton cloth requires _______ to decompose.
  • more than 15 years
  • 10-15 years
  • 100 years
  • 2-5 months
______ is an example of biodegradable material.
  • Aluminium
  • Plastic
  • Cotton
  • None of these
Which type of fiber is flax?
  • Leaf fiber
  • Bast fiber
  • Animal fiber
  • Fruit fiber
Examples of non-biodegradable is/are :
  • Tires
  • Plastic
  • Electronic components
  • All of these
Plastic can be used for:
  • polythene bags
  • food packaging
  • electrical appliances
  • All of the above
Which of the following is an animal fiber?
  • Silk
  • Wool
  • Alpaca
  • All of the above
_______ provides good heat and sound insulation.
  • Propylene
  • Styrofoam
  • Polythene
  • Acrylic
Define plasticity.
  • Ability to regain its original shape.
  • Ability to flow when subjected to stress.
  • Ability to change shape permanently.
  • Both B and C.
Rayon is a/an:
  • natural silk
  • artificial silk
  • regenerated fibre
  • none of these
Which of the following can absorb over 90% of its own mass of water and also does not stick to wounds?
  • Saran
  • Thiokol
  • Rayon
  • Gun cotton
When plastics are burnt, toxic substances are released into air causing ___________ pollution.
  • water
  • air
  • soil
  • None of these
Fibres that are obtained from plants and animals are called 
  • natural fibres
  • synthetic fibres
  • plastics
  • none of these
___________________ are obtained from cotton plant and sheep respectively.
  • Wool and cotton
  • Cotton and wool
  • Silk and wool
  • Wool and silk
Plastics are ____________ in water.
  • highly soluble
  • slightly soluble
  • insoluble
  • sparingly soluble
Bed sheets, curtains, tents, parachutes etc are made from :
  • Natural fibres
  • Synthetic fibres
  • Rayon
  • None of these
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