CBSE Questions for Class 8 Chemistry Synthetic Fibres And Plastics Quiz 5 - MCQExams.com

It is advised to wear clothes in summer made of:
  • Silk
  • Wool
  • Nylon
  • Cotton
Polywool is made by blending polyester and :
  • acrylic
  • rayon
  • cotton
  • wool
Which of the following is a thermosetting plastic?
  • PVC
  • Polyethylene
  • Bakelite
  • Terylene
Synthetic fibers having almost common property are:
  • nylon and polyester
  • nylon and plastics
  • polyester and plastics
  • all of the above
Rayon is different from synthetic fibres because :
  • it has a silk appearance
  • it is obtained from wood pulp
  • it can also be woven like those of natural fibres
  • it is natural
Which of the following are incorrectly matched?

354172_d37e286bf8424d048526a4a5da020c3d.png
  • (i) & (ii)
  • (i), (ii) & (iii)
  • (i), (iii) & (iv)
  • All of these
Read the following statement and mark the correct answer.

I. Artificially prepared synthetic fibre which resembles silk is known as terylene.
II. Rayon is not considered as a synthetic fibre as it is regenerated from cellulose.
III. PET bottles and jars are made up of polyesters. 
  • Statement I is false, II and III are true
  • Statement I is true, II and III are false
  • Statement I and II are false, III is true
  • Statement II is true, I and II are false
Match the column I with Column II and choose the correct option using the codes given below.
column IColumn II
(a)A fibre obtained by chemical treatment of wood pulp(i)Melamine
(b)A fibre stronger than steel wire(ii)Acrylic
(c)A fibre known as artificial wool(iii)Rayon
(d)A fire-proof plastic(iv)Nylon
  • (a) - (i), (b) - (iv), (c) - (iii), (d) - (ii)
  • (a) - (iv), (b) - (i), (c) - (iii), (d) - (ii)
  • (a) - (iii), (b) - (iv), (c) - (ii), (d) - (i)
  • (a) - (ii), (b) - (i), (c) - (iv), (d) - (iii)

Which of the following are incorrectly matched ?
354174_4b3ad86b55084eb582f98cc3ce47ce2b.PNG
  • (i) and (ii)
  • (i), (ii) and (iii)
  • (i), (iii) and (iv)
  • All of these
State true or false.
Like synthetic fibers, plastic is also a polymer.
  • True
  • False
Read the following statement and mark the correct answer. 
I. Artificially prepared synthetic fibre which resembles silk is known as terylene.
II. Rayon is not considered a synthetic fibre as it is regenerated from cellulose.
III. Bottles and jars are made up of PET. 
  • Statement I is false, II and III are true
  • Statement I is true, II and III are false
  • Statement I and II are false, III is true
  • Statement II is true, I and II are false
The fibre developed in Newyork & London simultaneously is known as:
  • rayon 
  • silk
  • PVC
  • nylon
Why is the waste created by plastics not friendly to the environment?
  • Plastics are non-biodegradable.
  • Plastics are biodegradable.
  • On burning, they cause pollution due to evolution of poisonous gases.
  • Both A and C
Which of the following is used to make disposable cups?
  • Low density polyethylene
  • Polypropylene
  • Polystyrene
  • PVC
The fibre obtained from cellulose is:
  • polyester
  • nylon
  • acrylic
  • rayon
Which of the following material is responsible for the cause of animal death?
  • Paper
  • Plastic
  • Grass 
  • None of the above
Which among the following plastic does not belong to either thermoplastic or thermosetting?
  • PVC
  • Bakelite
  • Melamine
  • Teflon
A non-biodegradable waste is:
  • metallic tins
  • plastic
  • polythene
  • All the above
Which of the following is a synthetic fiber ?
  • Cotton
  • Linen
  • Rayon
  • Silk
Natural fibres can be defined as:
  • substances produced by plants and animals.
  • man-made fibres produced industrially.
  • a thin, thread like structure.
  • none of the above
Nylon is an example of thermoplastic.
  • True
  • False
State true or false.
Most of the plastics are resistant to strong acids and alkalies.
  • True
  • False
The fibres of nylon is stronger than :
  • Steel wire of same thickness
  • Steel wire of different thickness
  • Plastic fibres
  • Rayon
Which of the following statement is not true?
  • Fabric is made of yarn.
  • Jute is the outer covering of coconut.
  • Polyester is a synthetic fibre.
  • Silk fibre is obtained from silk worms.
Synthetic fibers are obtained from which of the following?
  • Plants
  • sheep's
  • Chemicals
  • Jute
Bed sheets are made up of:
  • rayon and wool
  • rayon and plastic
  • rayon and nylon
  • rayon and cotton
State whether true or false.
Thermosetting plastics can be remolded on gentle heating.
  • True
  • False
Polyester consists of :
  • repeating unit of ether
  • repeating unit of caboxylic acid
  • repeating units of ester
  • repeating unit of hydroxide
Why is plastic a poor conductor?
  • They are non-reactive
  • They can melt
  • They have high number of free electrons
  • They do not have free electrons
Which among the following is a poor conductor of heat and electricity?
  • Melamine
  • Bakelite
  • Both A and B
  • None of above
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