Class 8 Synthetic Fibres And Plastics CBSE Questions & Answers

Class 8 · Synthetic Fibres And Plastics

This is Science Class 8 Synthetic Fibres and Plastics CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
Necklace : bead :: synthetic fibre : _____
  • A
    monomer
    Correct
  • B
    polymer
  • C
    dimer
  • D
    tetramer
2
The first true plastic was :
  • A
    Melamine
  • B
    Bakelite
    Correct
  • C
    Rayon
  • D
    Polystyrene
3
Uniform of firemen have a coating of :
  • A
    cotton
  • B
    melamine
    Correct
  • C
    jute
  • D
    bakelite
4
The first thermosetting plastic was:
  • A
    Melamine
  • B
    PVC
  • C
    Haematite
  • D
    Bakelite
    Correct
5
Synthetic polymers are :
  • A
    good conductor of heat
  • B
    bad conductor of heat
    Correct
  • C
    biodegradable
  • D
    chemically reactive
6
Which of the following set of features belong to thermosetting plastics ?
  • A
    hard and less brittle
  • B
    strong and soft
  • C
    hard and more brittle
    Correct
  • D
    soft and less brittle
7
The thermosetting plastic formed by condensation of phenol and formaldehyde is :
  • A
    Bakelite
    Correct
  • B
    Teflon
  • C
    Nylon
  • D
    Melamine
8
PTFE is better known as :
  • A
    Dacron
  • B
    Teflon
    Correct
  • C
    Rayon
  • D
    Nylon
9
Fabrics are made with :
  • A
    yarn
  • B
    all polymers
  • C
    thread
  • D
    either yarn or thread
    Correct
10
Which of the following is a thermoplastic :
  • A
    all the above
  • B
    Nylon
    Correct
  • C
    Melamine
  • D
    Bakelite
11
A non biodegradable fibre will cause :
  • A
    cleaner air
  • B
    better environment
  • C
    high productivity
  • D
    pollution
    Correct
12
Plastics are poor conductor of heat thus on bringing closer to flame:
  • A
    they remain unaffected
  • B
    they change colour but not shape
  • C
    they melt
    Correct
  • D
    they change from thermoplastic to thermosetting plastic
13
A man- made fibre obtained from natural source is:
  • A
    Rayon
    Correct
  • B
    Nylon
  • C
    Polyester
  • D
    Acrylic
14
Which of the following is not found in both natural as well as artificial forms :
  • A
    Jute
    Correct
  • B
    Rubber
  • C
    Wool
  • D
    Silk
15
Read the following statements :i) fibres are made from fabrics.ii) fabrics are made from fibres.
  • A
    both are correct
  • B
    both are wrong
  • C
    Statement ii) is wrong and i) is correct
  • D
    Statement i) is wrong and ii) is correct
    Correct