It is advised to restrict the use of plastic, Why?

Since plastic takes several years to decompose, it is not environment friendly. It causes environmental pollution. Besides, the burning process in the synthetic material is quite slow and it does not get completely burnt easily. In the process it releases lots of poisonous fumes into the atmosphere causing air pollution.

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

When you burn synthetic fibres you find that their behaviour is different from that of the natural fibres. You must have noticed that synthetic fibres melt on heating. This is actually a disadvantage of synthetic fibres. If the clothes catch fire, it can be disastrous. The fabric melts and sticks to the body of the person wearing it. We should, therefore, not wear synthetic clothes while working in the kitchen or in a laboratory.

The material which is commonly used for making kitchen containers is

PET is “polyethylene terephthalate”. PET as a plastic is very light weight and is commonly used for making kitchen containers.

Consider the following statements, choose the incorrect one:

A polymer is a chain of many small units of monomer. A synthetic fibre is also a chain of small units joined together. Each small unit is actually a chemical substance. Many such small units combine to form a large single unit called a polymer. The word ‘polymer’ comes from two Greek words; “poly” meaning “many” and “mer” meaning “part/unit”. So, a polymer is made of many repeating units.

Consider the following statements and choose the incorrect one:

Here, all the statements are correct. Hence, your answer will be option [D].

Consider the following statements and choose the incorrect one:

Plastics and synthetic both are non-biodegradable. Burning of plastics and synthetic fabrics produces lots of poisonous gases causing air pollution. So, it is not advised to burn plastic and synthetic fibres.

Boojho is writing some statements, choose the correct statement and help him:

Plastic is non-reactive material. Thermoplastic when molded once can be softened on heating. It has very high risk to wear synthetic clothes while working in the kitchen. Hence, your answer will be option [D].

Which of the following represents the correct match?

Nylon is fibre, PVC is thermoplastic, bakelite is thermosetting plastic.

Paheli is writing some statement which is given by her teacher. Would you help him to choose the correct statements?

Here, all these statements are correct. Hence, your answer will be option [D].

Which of the following is not a common property of plastic?

Plastics are non-reactive, light in weight and durable but they do not conduct electricity.

Boojho appeared in class test where he wrote some statements but he confused to know the incorrect statement. Would you help him to know that?

Here, all these statements are correct except option [A]. “Rayon” is prepared by using wood pulp. Rayon is also known as semi-synthetic fibre, because this fibre is obtained by chemical treatment of wood pulp. Hence, your answer will be option [A].

In which of the following statements is or are incorrect?

Here, all these statements are correct. Hence, your answer will be option [D].

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

Bakelite is used for making the handles of various cooking utensils because it is a poor conductor of heat and does not become soft on getting heated.

Paheli is writing some statements but she confused to know whether the statements are correct or not? Would you help her?

Cotton is a “Natural polymer” called cellulose. Cellulose is made up of a large number of glucose units. Hence, “Cellulose” is a natural polymer of cotton fibre.

Consider the given statements and choose the incorrect one:

Wood pulp is a soft but wet mass of fibre obtained from wood. Wood pulp contains a large amount of natural polymer called “cellulose”. Rayon is man-made fibre from a natural material called cellulose (obtained from wood pulp). Nylon, polyester are fully synthetic fibres which do not require a natural material (like cellulose).

The material similar to silk in appearance is:

Rayon resembles silk in appearance; therefore, rayon is also called artificial silk.

Mohan is writing some statements, choose the incorrect statements and help him:

Here, all the statements are correct. Hence, your answer will be option [D].

Paheli is taking preparation for her final examination. She is writing some statements about “Nylon” but she confused to know whether the statements are correct or not? Would you help her?

Actually, nylon is made up of the repeating units of a chemical called an “amide”. So, nylon is a polyamide (which is a polymer). Nylon is a thermoplastic polymer which can be melted by heating. Molten nylons is forced through the tiny holes in a spinneret to make nylon fibres (or nylon threads) or cast into desired shapes.

Which is a thermosetting plastic?

Melamine is a thermosetting plastic which when molded once, cannot be softened and by heating.

Consider the following statements, choose the incorrect one:

A “Polymer” is a chain of many small units of “monomer”. Rest of all are correct. Hence, your answer will be option [C].

Boojho is writing some statements about polyester. In which of the following statements is or are incorrect? Help him.

Polyester do not stretch and do not rot in contact with water. Polyester is used for making sails of sailboat. The polyester sails are light and strong. The most important use of polyester is in making fabrics for sarees, dress materials and curtains.

Rayon is different from truly synthetic fibres because:

A rayon fibre was obtained by chemical treatment of wood pulp. This fibre was called rayon or artificial silk. Although rayon is obtained from a natural source, wood pulp, yet it is a man-made fibre. It is cheaper than silk and can be woven like silk fibres.

Which of the following are thermosetting polymers?

There are some plastics which when moulded once, can-not be softened by heating. These are called thermosetting plastics. Two examples are “Bakelite” and “Melamine”. Bakelite is a poor conductor of heat and electricity. It is used for making electrical switches, handles of various utensils, etc. Melamine is a versatile material. It resists fire and can tolerate heat better than other plastics. It is used for making floor tiles, kitchenware and fabrics which resist fire.

The similarity between artificial silk and cotton is that:

A fibre was obtained by chemical treatment of wood pulp (cellulose). This fibre was called rayon or artificial silk. Polymers occur in nature also. Cotton is a polymer called cellulose. Cellulose is made up of a large number of glucose units.

Which of the following is a source of rayon?

Rayon is obtained by the chemical treatment of wood pulp (which contain cellulose).

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

When you burn synthetic fibres you find that their behaviour is different from that of the natural fibres. You must have noticed that synthetic fibres melt on heating. This is actually a disadvantage of synthetic fibres. If the clothes catch fire, it can be disastrous. The fabric melts and sticks to the body of the person wearing it. We should, therefore, not wear synthetic clothes while working in the kitchen or in a laboratory.

“The synthetic fibre A is chemically a polyamide whereas the synthetic fibre B contains a large number of easter groups. Another synthetic fibres C is made of a polymer D the which consists of a large number of glucose units joined one after the other”. Which fibre is prepared from the natural raw material?

If you consider the statements there is written that “…Another synthetic fibres C is made of a polymer D the which consists of a large number of glucose units joined one after the other” it implies that “Fibre C” is prepared from the natural raw material.

Pick the synthetic fibre out of the following:

Nylon is a synthetic fibre. It is made without using any natural raw material. Cotton, jute and wool are natural fibres.

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: 8	Science
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.

In which of the following statement is or are incorrect?

[A]. Cotton fabrics do not wrinkle easily.

[B]. Teflon is used to make non-stick cookware.

[C]. Rayon is prepared by using wood pulp.

[D]. Nylon is used for making parachute and stockings.

View Answer

Consider the following statement and choose the incorrect one:

[A]. Chemical name of natural polymer of cotton is cellulose.

[B]. Rayon is often regarded as artificial silk.

[C]. Terycot is made by mixing terylene and cotton.

[D]. None of the above

Boojho is writing some statements but he confused to know whether the statements are correct or not? Would you help him?

[A]. Rayon is often regarded as artificial silk.

[B]. Rayon is natural fibre prepared by chemical treatment.

[C]. Synthetic fibre are prepared by using petrochemicals.

[D]. All the fibres are different from texture generally, it means feel, appearance and shine.

View Answer

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

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.

View Answer

Start a New Test

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 Silk	Burns slowly, with a smell like that of burning hair but no beads are produced.
Polyester	Results are like nylon, except that black smoke is produced.
Rayon	Burns quickly with a smell of burning paper.
Acrylic	Burns 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.

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Class 8 Science Chapter 3 MCQ

Class 8 Science Chapter 3 MCQ for 2020-2021

Class 8 Science Chapter 3 MCQ for Exams

In which of the following statement is or are incorrect?

Consider the following statement and choose the incorrect one:

Boojho is writing some statements but he confused to know whether the statements are correct or not? Would you help him?

In which of the following statement is or are incorrect?

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

Identification of fibres by burning their threads

Detergent

What is a polymer?

Which is the first man made synthetic polymer?

What is Rayon?

What are the different forms of Terylene?

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