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Synthetic Fibres and Plastics Class 8 MCQs Questions with Answers
Solving Synthetic Fibres and Plastics Multiple Choice Questions of Class 8 Science Chapter 3 MCQ can be of great help to students as they will be aware of all the concepts. These MCQ Questions on Synthetic Fibres and Plastics Class 8 with answers pave for a quick revision, thereby helping you learn more about this subject.
Question 1.
Cellulose is made up of a large number of ………………… units.
(a) glucose
(b) fructose
(c) protein
(d) none of these
Answer
(a) glucose
Cellulose is made up of a large number of glucose units.
Question 2.
Synthetic fibres are:
(a) strong
(b) durable
(c) hining
(d) all of these
Answer
(d) all of these
Synthetic fibres are strong, durable and shining
Question 3.
Which of the following is not thermoplastics:
(a) acrylic
(b) polyethylene
(c) polystyrene
(d) melamine
Answer
(d) melamine
Melamine is not thermoplastics, it is thermosetting plastic. Acrylic, polyethylene and polystyrene are thermoplastic.
Question 4.
Wire made from which fibre is strongest:
(a) nylon
(b) cotton
(c) wool
(d) steel
Answer
(a) nylon
Wire made from nylon fibre is the strongest.
Question 5.
PET is form of:
(a) steel
(b) glass
(c) polyester
(d) nylon
Answer
(c) polyester
PET is a form of polyester.
Question 6.
Which of the following is used to make non-stick cookwares:
(a) polyester
(b) teflon
(c) rayon
(d) nylon
Answer
(b) teflon
Teflon is used to make non-stick cookwares.
Question 7.
Which of the following is used for making parachutes and stockings:
(a) polyester
(b) teflon
(c) rayon
(d) nylon
Answer
(d) nylon
Nylon is used for making parachutes and stockings.
Question 8.
Fabrics made of …………………. do not wrinkle easily.
(a) polyester
(b) teflon
(c) rayon
(d) nylon
Answer
(d) nylon
Fabrics made of polyester do not wrinkle easily.
Question 9.
Wood pulp is used for preparation of:
(a) polyester
(b) teflon
(c) rayon
(d) nylon
Answer
(c) rayon
Wood pulp is used for preparation of Rayon.
Question 10.
Which of the following softens on heating and then can be moulded into various shapes:
(a) thermosetting plastic
(b) thermoplastic
(c) polythene
(d) none of these
Answer
(b) thermoplastic
Thermoplastic softens on heating and then can be moulded into various shapes.
Question 11.
Which of the following once set do not soften on heating:
(a) thermoplastic
(b) thermosetting plastic
(c) polvthene
(d) none of these
Answer
(b) thermosetting plastic
Thermosetting plastic once set do not soften on heating.
Question 12.
Food hems are stored ¡n plastic containers because they are:
(a) corrosive
(b) non-corrosive
(c) easy to handle
(d) all of these
Answer
(b) non-corrosive
Food items are stored in plastic containers because they are non-corrosive.
Question 13.
Bristles of tooth brush are made from:
(a) thermoplastic
(b) therniosetting plastic
(c) nylon
(d) PET
Answer
(c) nylon
Bristles of tooth brush are made from nylon because it is soft, flexible and strong.
Question 14.
Which of the following can be recycled:
(a) carry bags
(b) plastic chairs
(c) telephone instruments
(d) cooker handles
Answer
(c) telephone instruments
Telephone instruments can be recycled as it is made up of thermoplastics.
Question 15.
Which of the following cannot be recycled:
(a) plastic toys
(b) plastic bowls
(c) plastic covering on electric wires
(d) ball point pens
Answer
(c) plastic covering on electric wires
Plastic covering on electric wire cannot by recycled as it is made up of theremosetting plastics.
Question 16.
The fibre that burns readily with smell of burning paper is:
(a) acrylic
(b) polyester
(c) cotton
(d) rayon.
Answer
(c) cotton
Cotton fibre burns readily with smell of burning paper.
Question 17.
Which of the following is a thermosetting plastic:
(a) PVC
(b) nylon
(c) teflon
(d) bakelite
Answer
(d) bakelite
Bakelite is a thermosetting plastic.
Question 18.
Which of the following is obtained from hair of an animal:
(a) nylon
(b) silk
(c) cotton
(d) wool
Answer
(d) wool
Wool is obtained from hair of an animal (sheep).
Question 19.
Which of these fibres is made from raw material obtained from plants:
(a) rayon
(b) nylon
(c) terylene
(d) polyester
Answer
(a) rayon
Rayon is made from cellulose obtained from wood pulp (plants).
Question 20.
Which of the following fibre is synthetic:
(a) cotton
(b) jute
(c) nylon
(d) silk
Answer
(c) nylon
Nylon is synthetic whereas cotton, jute and silk are natural fibres.
Question 21.
Which of the following fibre is natural polymer:
(a) rayon
(b) cotton
(c) polyester
(d) polythene
Answer
(b)cotton
Cotton is natural polymer whereas rayon, polyester and polythene are synthetic polymers.
Question 22.
Which of the following is not biodegradable:
(a) aluminium foil
(b) papers
(c) cow-dung
(d) rotten fruits
Answer
(a) aluminium foil
Aluminium foil is not biodegradable.
Question 23.
Rayon is:
(a) artificial
(b) nylon
(c) artificial nylon
(d) none of these
Answer
(a) artificial
Rayon is artificial silk
Question 24.
Polymer present in plants is:
(a) cellulose
(b) nylon
(c) rubber
(d) P.V.C.
Answer
(a) cellulose
Polymer present in plants is cellulose.
Question 25.
Natural substance is:
(a) plastics
(b) cement
(c) glass
(d) wood
Answer
(d) wood
Wood is a natural substance where as plastics, cement and glass are man-made substances.
Question 26.
Polymer present in wood is:
(a) nylon
(b) cellulose
(c) polythene
(d) rubber
Answer
(b) cellulose
Cellulose polymer is present in wood
Question 27.
Which of the following garbage is biodegradable:
(a) broken plastics things
(b) fruit peels
(c) cement
(d) iron wastes
Answer
(b) fruit peels
Fruit peels are biodegradable.
Question 28.
Polycot is a mixture of:
(a) polythene and cotton
(b) polyester and cotton
(c) polythene and wool
(d) polyester and wool
Answer
(b) polyester and cotton
Polycot is a mixture of polyester and cotton.
Question 29.
Polywool is a mixture of:
(a) polythene and cotton
(b) polyester and cotton
(c) polythene and wool
(d) polyester and wool
Answer
(d) polyester and wool
Polywool is a mixture of polyester and wool.
Question 30.
A synthetic fibre resembling wool is:
(a) rayon
(b) nylon
(c) acrylic
(d) none of these
Answer
(c) acrylic
A synthetic fibre resembling wool is acrylic.
Match the Column-A with Cosumn-B:
Question 1.
| Column-A | Column-B |
| (a) Monomers | (i) chemical molecules formed naturally like silk, cotton etc. |
| (b) Polymers | (ii) chemical molecules synthesized by human. |
| (c) Natural polymers | (iii) the process of formation of polymers by synthesis of monomers |
| (d) Synthetic ploymers | (iv) simple chemical molecules made of single unit. |
| (e) Polymerisation | (v) complex chemical molecules made of many type of single units. |
Answer
| Column-A | Column-B |
| (a) Monomers | (iv) simple chemical molecules made of single unit. |
| (b) Polymers | (v) complex chemical molecules made of many type of single units. |
| (c) Natural polymers | (i) chemical molecules formed naturally like silk, cotton etc. |
| (d) Synthetic ploymers | (ii) chemical molecules synthesized by human. |
| (e) Polymerisation | (iii) the process of formation of polymers by synthesis of monomers |
Question 2.
| Column-A | Column-B |
| (a) Rayon | (i) sarees |
| (b) Nylon | (ii) carpets |
| (c) Acrylic | (iii) utensils |
| (d) Polyester | (iv) sweaters |
| (e) PET | (v) socks |
Answer
| Column-A | Column-B |
| (a) Rayon | (ii) carpets |
| (b) Nylon | (v) socks |
| (c) Acrylic | (iv) sweaters |
| (d) Polyester | (i) sarees |
| (e) PET | (iii) utensils |
Question 3.
| Column-A | Column-B |
| (a) Melamine | (i) Non-biodegradable |
| (b) Acrylic | (ii) Biodegradable |
| (c) Woollen items | (iii) Thermosetting plastic |
| (d) Metal cans | (iv) Thermoplastic |
Answer
| Column-A | Column-B |
| (a) Melamine | (iii) Thermosetting plastic |
| (b) Acrylic | (iv) Thermoplastic |
| (c) Woollen items | (ii) Biodegradable |
| (d) Metal cans | (i) Non-biodegradable |
State whether the following statements are True or False:
Question 1.
Polyester fibres are used for making hand knit sweaters.
Answer
False
Question 2.
Rayon is made from cellulose obtained from wood pulp.
Answer
True
Question 3.
Plastics are man-made materials.
Answer
True
Question 4.
A long chain like molecule consisting of a large number of simple small molecules joined to each other by chemical bonds is called polymer.
Answer
True
Question 5.
Silk fibre is obtained from cocoons of the silk moth.
Answer
True
Question 6.
Acrylic fibres bums with a sooty flame and shrinks to form black beads.
Answer
True
Question 7.
Wool is a natural fibre obtained from plants.
Answer
False
Question 8.
Plastics are non-biodegradable.
Answer
True
Question 9.
We should wear synthetic clothes while working in the kitchen or in a laboratory.
Answer
False
Question 10.
Nylon fibre is used for making nylon parachutes and ropes for rock climbing.
Answer
True
Question 11.
Cotton clothes are more comfortable during hot/humid weather.
Answer
True
Question 12.
Polyester is a synthetic fibrous material.
Answer
True
Question 13.
Plastic is environmental friendly.
Answer
False
Question 14.
Thermoplastics is used for making handles of pressure cooker.
Answer
False
Question 15.
Plastic reacts with air and water.
Answer
False
Fill in the blanks:
Question 1.
Plastics which gets deformed easily on heating and can be bent easily are known as …………………
Answer
thermoplastics
Question 2.
Synthetic fibres do not absorb …………………
Answer
water
Question 3.
A material which is not easily decomposed by natural processes is termed as …………………
Answer
non-biodegradable
Question 4.
The simplest molecule of a polymer is called ………………….
Answer
monomer
Question 5.
………………… has anti-stick property and used as a coating on the surface of frying pan.
Answer
Teflon
Question 6.
A material which gets decomposed through natural processes, such as action by bacteria, is called ………………….
Answer
biodegradable
Question 7.
………………… is used for making ploythene bags.
Answer
Polythene
Question 8.
The 4-R principle is (a) ……………… (b) ……………. (c) ……………….. (d) ……………..
Answer
(a) Reduce
(b) Reuse
(b) Recycle
(d) Recover
Question 9.
The plastics which when moulded once, can not be softened by heating are called …………………
Answer
ther mosetting plastics
Question 10.
Nylon was prepared from ……………………., ………………… and ……………………
Answer
coal, water, air.
Question 11.
Polyester is made up of the repeating units of a chemical called …………………
Answer
ester
Question 12.
Ester have a ………………… smell.
Answer
fruity
Question 13.
Polywool is a mixture of ………………… and wool.
Answer
polyester
Question 14.
………………… fibre resembles wool.
Answer
Acrylic
Question 15.
We should wear ………………… clothes in the kitchen.
Answer
cotton
Question 16.
Synthetic fibres are synthesised from raw material called …………………
Answer
petrochemicals
Question 17.
On burning, plastics release ………………… gases.
Answer
poisonous
Question 18.
………………… fabrics do not wrinkle easily.
Answer
Polyester
Question 19.
Electric plugs are made up ………………… plastics.
Answer
ther mosetting
Question 20.
Synthetic fibres are also called ………………… fibres.
Answer
man-made
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