Class 8 Science Chapter 3 MCQ

Class 8 Science Chapter 3 MCQ (Multiple Choice Questions) of Synthetic Fibres and Plastic. A full revision with question-answer and explanation in the form of MCQs based on latest CBSE Syllabus for new academic session 2020-2021.

After selecting the correct or incorrect answers, you can see the right answers with reason behind them.




Class 8 Science Chapter 3 MCQ for 2020-2021

Class: 8Science
Contents:Multiple Choice Questions – MCQ Tests

Class 8 Science Chapter 3 MCQ for Exams

Class 8 Science Chapter 3 MCQ with complete explanation are given below. There more than 100 questions with answers based on Class 8 Science Chapter 3 NCERT Textbook. All the 20 sets of online tests are free to use again and again. If you feel revision, please visit to Important Questions or NCERT Solutions links given just below to each question.

Q1

Paheli is writing some statements. She wants to know in which of the following statements is or are incorrect?

[A]. The fabric terry wool is obtained by mixing terylene and wool.
[B]. It is risky to wear synthetic clothes while working in the kitchen.
[C]. Some of the plastics are biodegradable.
[D]. Synthetic fibres do not melt on heating.
Q2

Which of the following statement is or are incorrect?

[A]. Polyester is a that type of fabric that do not wrinkle easily.
[B]. Teflon is used for making non-stick cookware.
[C]. Rayon is prepared by using wood pulp.
[D]. Plastic is used for making parachutes ropes.




Q3

Which of the following represents the correct match?

[A]. Nylon is thermosetting plastic, PVC is fibre, bakelite is thermoplastic
[B]. Nylon is fibre, PVC is thermoplastic, bakelite is thermosetting plastic
[C]. Nylon is thermosetting plastic, PVC is thermoplastic, bakelite is fibre
[D]. Nylon is fibre, PVC is thermosetting plastic, bakelite is thermoplastic
Q4

In which of the following statement is or are incorrect?

[A]. Polymer is large single chemical unit.
[B]. Acrylic is known as artificial silk.
[C]. Nylon is first fully synthetic fibre.
[D]. Polyester fibre does not wrinkle easily.




Q5

The most suitable material for the preparation of handles of cooking utensils is:

[A]. Polythene
[B]. PVC
[C]. Nylon
[D]. Bakelite
Q6

Consider the given statements and choose the incorrect one:

[A]. Wood pulp is a hard but wet mass of fibre obtained from wood.
[B]. Wood pulp contains a large amount of natural polymer called glucose.
[C]. Rayon is natural fibre because it is made from cellulose.
[D]. All the above.




Q7

In which of the following statement is or are incorrect?

[A]. Nylon was made in the year 1931.
[B]. Nylon developed in Netherlands and London.
[C]. Nylon is not attacked by moths and ordinary chemicals.
[D]. Nylon fibre have high abrasion resistance
Q8

Rayon is different from truly synthetic fibres because:

[A]. It has a silk like appearance.
[B]. It is obtained from wood pulp.
[C]. Its fibres can be woven like those of natural fibres.
[D]. It can be dyed in wide variety of colors.



Q9

Consider the following statements and choose the correct statement(s):

[A]. PET is a very familiar form of polymer.
[B]. PET can be made into a fibre or a plastic.
[C]. PET is replacing materials like glass.
[D]. All the above.
Q10

Paheli is writing some statements. She wants to know in which of the following statements is or are incorrect?

[A]. The fabric terry wool is obtained by mixing terylene and wool.
[B]. It is risky to wear synthetic clothes while working in the kitchen.
[C]. Most of the plastics are biodegradable.
[D]. Synthetic fibres do not melt on heating.

Identification of fibres by burning their threads

Cotton:Burns completely, leaving no residue.
Nylon:Burns slowly; fabric shrinks after exposure to flame, forms hard beads and gives off a smell of burning hair.
Wool and SilkBurns slowly, with a smell like that of burning hair but no beads are produced.
PolyesterResults are like nylon, except that black smoke is produced.
RayonBurns quickly with a smell of burning paper.
AcrylicBurns slowly with a sooty flame; fabric shrinks from flame, and forms black beads.



Detergent

Leftover chemical substances obtained from petroleum products were treated with sulphuric acid to invent a new soap-like product known as detergent.

What is a polymer?

A long chain of molecules is called a polymer. It is made up of a large number of monomer molecules joined end to end to form a large molecule. There are many polymers that occur naturally, such as rubber, silk, wool and even cotton.

Which is the first man made synthetic polymer?

The first man-made synthetic fibre, nylon, was put into commercial production in 1939 by a team of scientists of the famous chemical company, E.I. Dupont de Nemours. Nylon derives its name from the first letter of ‘New York’ and first three letters of ‘London’, the two cities where it was simultaneously developed and marked.

What is Rayon?

Rayon is a type of synthetic (man-made) material that resembles silk in appearance.

What are the different forms of Terylene?

Terylene has wool-like texture, which is why it is often used to weave fabrics for making suits, trousers, etc. It is called terycot when blended with cotton, and terywool when mixed with wool.