CBSE Questions for Class 8 Chemistry Synthetic Fibres And Plastics Quiz 7 - MCQExams.com

Which of the following is a natural fabric?
  • Polythene
  • PVC
  • Nylon
  • Wool
We come to a conclusion, that plastics are bad conductors of electricity from the following.
  • Refrigerators and freezers have a plastic foam core
  • Electrical wires have a plastic covering
  • Cooking pans have plastic handles
  • We use to prepare parachutes
These processes can be used to prevent health hazards of plastics:
  • Reduce
  • Reuse
  • Recover
  • Recycle
Raw materials for most of the natural fabrics are obtained from:
  • water
  • earth
  • petroleum
  • sky
Which of the following is a method to control water pollution?
  • Using water hyacinth to remove water pollutants
  • Recycling, Renovation, Recharge and Reuse (4R concept) of waste water
  • Both A and B
  • None of these
Common variety of polyester is_____
  • terylene
  • polymer
  • viscose
  • spinneret
Plastic is harmful for packaging of food and medicines.
  • True
  • False
Plastic can  __________ percolation of water into the soil and prevent replenishment of groundwater.
  • increase
  • reduce
  • stop
  • none of the above
$$4R$$ concept is a measure to control ________.
  • air pollution
  • land pollution
  • water pollution
  • none of the above
Environmental pollution by plastics can be minimized by practising the 4R principle, which stands for:
  • Reduce, Reuse, Recycle and Remember.
  • Reduce, Reuse, Recycle and Recover.
  • Reduce, Reuse,, Rework and Recycle.
  • Reduce, Regenerate, Rework and Recycle.
 Disposable plastic plates should not be used because:
  • They are made of materials with light weight.
  • They are made of toxic materials.
  • They are made of biodegradable materials.
  • They are made of non-biodegradable materials.
Which of the following statement about plastics is incorrect?
  • They are usually light
  • They are derived from petroleum
  • They are man-made ploymers
  • They are good conductor of electricity in molten state
Which of the following best describes biodegradation?
  • A minor change in an organic molecule
  • Fragmentation of a complex organic molecule
  • Complete transformation of the organic molecule to mineral forms
  • All of the above
  • None of the above
Which of the following is biodegradable?
  • Iron Nails
  • Plastic Mugs
  • Leather Belts
  • Silver Foils
What is biodegradable?
  • Something that grows up
  • Natural decomposition by bacteria
  • Food for animals
  • Something that can melt
Which of the following is/are the reasons for using plastics?
They are light, strong, and durable.
They are cheap.
They can be moulded into different shapes.
  • 1
  • 2
  • 3
  • All of the above
Which of the following are the advantages of plastic over metals?
Plastics are lighter.
Plastics are usually cheaper.
Plastics are inert to both acids and alkalis.
  • (1) and (2) only
  • (1) and (3) only
  • (2) and (3) only
  • (1) ,(2) and (3)
Cotton fibers are separated from seeds by:
  • combing
  • knitting
  • weaving
  • rubbing
The substance which undergoes decomposition by the microbial action is called a:
  • Biodegradable substance
  • Non-biodegradable substance
  • Recyclable substance
  • None of the above
All synthetic polymers are biodegradable substances.
  • True
  • False
Nylon is obtained by:
  • treating wood pulp
  • solidifying water
  • mixing coal, air and water
  • mixing chemicals
_________  is stronger than steel wire.       
  • Cotton fibre
  • Silk thread
  • Plastic thread
  • Nylon fibre
Which of the followings prove that plastics do not make food and medicine toxic?
  • Milk pouches
  • Edible oil container
  • Ice-cream packs
  • All of these
Plastic is bad for environment because :
  • They are non-biodegradable
  • They harm aquatic life
  • They are toxin carrier
  • All of these
The world's first fully synthetic plastic was:
  • Polystyrene
  • Nylon
  • Bakelite
  • Teflon
______ is a popular polyester.
  • Plastic
  • Polythene
  • Rayon
  • Terylene
Which is NOT the general characteristics of plastics?
  • Good electrical insulators
  • Acceptable acoustic insulation
  • Resistant to corrosion and many chemical factors
  • Have a high production cost
Which is the correct sequence in context with the least bio degradable to most biodegradable material?
  • Bones, Plastic, Paper, Metal Can
  • Paper, Metal Can, Bones, Paper
  • Plastic, Metal Can, Bones, Paper
  • Plastic, Bones, Paper, Metal Can
Bullet proof helmets are made from :
  • lexan
  • saran
  • glyptal
  • thiokol
Which of the following is not synthetic fibres?
  • Polyester
  • Nylon
  • Acrylic
  • Wool
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