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 2021-2022.
After selecting the correct or incorrect answers, you can see the right answers with reason behind them.Class 8 Science Chapter 3 MCQ for 2021-2022
| 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.
Q1
It is advised to restrict the use of plastic, Why?
[A]. Plastics are biodegradable objects.
[B]. They easily decompose under the soil.
[C]. Microbes are responsible to easily rotted.
[D]. The burning of plastic waste gives out harmful gases in the air.
Q2
Which of the following statement is or are incorrect?
[A]. Acrylic is used for sweaters, furnishing fabrics and carpets.
[B]. Ryon is also used for making ropes for rock climbing.
[C]. Terylene is also mixed with natural fibre.
[D]. Plastics are used in spacecrafts.
Q3
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.
Q4
Which of the following groups contains all synthetic substances?
[A]. Nylon, terylene, wool
[B]. Cotton, polycot, rayon
[C]. PVC, polythene, bakelite
[D]. Acrylic, silk, wool
Q5
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.
Q6
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
Q7
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
Q8
Which of the following is not a common property of plastic?
[A]. Non-reactive
[B]. Light in weight
[C]. Durable
[D]. Good conductor of electricity
Q9
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?
[A]. Nylon is prepared by using wood pulp.
[B]. Teflon is used to make non-stick cookware.
[C]. Polyester is a type of fabrics do not wrinkle easily.
[D]. None of the above
Q10
In which of the following statements is or are incorrect?
[A]. The fibres obtained from plants and animals are called natural fibres.
[B]. Fibres the synthetic fibres are made by human beings.
[C]. A fibre is very thin thread like strand from which cloth is made.
[D]. None of the above
Q11
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.
Q12
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.
Q13
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.
Q14
Mohan is writing some statements, choose the incorrect statements and help him:
[A]. Thermoplastic gets deformed easily.
[B]. Thermosetting cannot be softened by heating.
[C]. Plastic bags are non-biodegradable.
[D]. None of the above.
Q15
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?
[A]. Nylon is the first fully synthetic fibre.
[B]. Nylon is made up of the repeating units of amide chemical.
[C]. Nylon is a thermosetting polymer.
[D]. Nylon fibres absorb very little water.
Q16
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
Q17
Consider the following statements, choose the incorrect one:
[A]. The synthetic fibres are also known as man-made fibres.
[B]. A fibre similar to wool is acrylic.
[C]. A monomer is a chain of many small units of polymer.
[D]. The first fully synthetic fibre was rayon.
Q18
Boojho is writing some statements about polyester. In which of the following statements is or are incorrect? Help him.
[A]. Polyester is a thermoplastic polymer.
[B]. Polyester fibres are stronger than nylon fibre.
[C]. Polyester do not stretch but rot in contact with water.
[D]. Polyester is used for making water hoses for fire-fighting operations.
Q19
Polycot is obtained by mixing:
[A]. Nylon and wool
[B]. Polyester and wool
[C]. Nylon and cotton
[D]. Polyester and cotton
Q20
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.
Q21
The similarity between artificial silk and cotton is that:
[A]. Both are non-biodegradable.
[B]. Both melt on heating.
[C]. Both are amide polymers.
[D]. Both are cellulose polymers.
Q22
Which of the following is a source of rayon?
[A]. Wool
[B]. PET
[C]. Wood pulp
[D]. Silk
Q23
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.
Q24
“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?
[A]. Fibre A
[B]. Fibre B
[C]. Fibre C
[D]. Fibre D
Q25
Pick the synthetic fibre out of the following:
[A]. Cotton
[B]. Nylon
[C]. Jute
[D]. Wool
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.
Class 8 Science Chapter 3 Extra Questions
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.
