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
Nylon does not contain :
  • A
    coal
  • B
    cellulose
    Correct
  • C
    air
  • D
    water
2
Which of the following is not included in 3R concept :
  • A
    recycle
  • B
    reduce
  • C
    react
    Correct
  • D
    reuse
3
It is dangerous to burn plastics because :
  • A
    increase number of insects
  • B
    fumes if inhaled cause immediate death
  • C
    reduce soil fertility
  • D
    fumes released can cause cancer
    Correct
4
To overcome disadvantages of synthetic fibres :
  • A
    mixed with plastics
  • B
    purified and dyed
  • C
    they are mixed with natural fibres
    Correct
  • D
    mixed with petroleum products and purified
5
It is a hard white solid and used as a sizing agent in the paper industry. This is :
  • A
    polypropylene
  • B
    polyvinylchloride
  • C
    bakelite
  • D
    melamine
    Correct
6
Sooraj threw away plastic bags near his house. Next day he saw his cow dead close by those bags :
  • A
    data insufficient
  • B
    she had eaten food kept inside those bags
  • C
    she had swallowed those bags
    Correct
  • D
    she had smelled those bags
7
Atul was climbing mountain and he wondered about the strength of rope in his hand which was stronger than a steel wire. This rope would have been made up of :
  • A
    polyester
  • B
    Dacron
  • C
    nylon
    Correct
  • D
    rayon
8
Read the following statements:i. Acrylic is costlier than wool.ii. It is the best alternative of wool.
  • A
    Statement i) is wrong and ii) is correct
    Correct
  • B
    both are wrong
  • C
    Statement ii) is wrong and i) is correct
  • D
    both are correct
9
Littering of plastic materials leads to :
  • A
    solid waste pollution
    Correct
  • B
    solid air pollution
  • C
    solid soil pollution
  • D
    solid liquid pollution
10
Read the following statements:i. Acrylic fibres can be made into transparent sheets.ii. Acrylic fibres are used to make thermal wears.
  • A
    Statement i) is wrong and ii) is correct
  • B
    Statement ii) is wrong and i) is correct
  • C
    both are correct
    Correct
  • D
    both are wrong
11
Bakelite is formed by condensation and polymerisation of :
  • A
    cellulose & cutin
  • B
    formaldehyde & ethylene
  • C
    phenol & formaldehyde
    Correct
  • D
    formaldehyde & melamine
12
Wood pulp is chemically treated to produce :
  • A
    cotton
  • B
    rayon
    Correct
  • C
    acrylic
  • D
    nylon
13
Making of base of magnetic recording tape needs :
  • A
    polyester
    Correct
  • B
    nylon
  • C
    acrylic
  • D
    rayon
14
The statement incorrect about rayon is :
  • A
    it is made entirely of chemicals
    Correct
  • B
    it is called regenerated fibre
  • C
    it is comfortable to wear in summers
  • D
    it is also called artificial silk
15
Match the following :i) Bakelite…………a) parachutesii) Nylon…………...b) PET containersiii) PVC……………c) sizing agent in paper industryiv) Melamine……..d) telephone instrumentsv) Polyester………e) raincoats
  • A
    i.d,ii.a,iii.b, iv.e, v.c
  • B
    i.b,ii.d,iii.e, iv.c, v.a
  • C
    i.d,ii.a,iii.e, iv.c, v.b
    Correct
  • D
    i.c,ii.e,iii.d, iv.a, v.b