3) It is easy to wash and it absorbs less water, and so it can be dried quickly. Rayon is obtained by chemical treatment of wood pulp. Define a thermosetting plastic and give examples. ii) False- Synthetic fibres melt on heating. (ii) The synthetic fibres are also known as ______ fibres. Plastic containers seem most convenient. b. Which synthetic fibre is also called artificial silk? Rayon is obtained by chemical treatment of wood pulp. False. What name is given to natural materials that are used to manufacture human-made materials? It was first invented in the 1950s and has been used for pipes since the 1970s. Melamine (MF) ? 15. A polymer is a macromolecule composed of many repeated subunits, known as monomers. 3. True. Iron Sulfur Carbon Tin 3-Which of the following materials is likely to be the best insulator? Can you guess why? Plastics are non-reactive. The material similar to silk in appearance is. On the other hand, clothes spun out of fibres made by a mixture of synthetic and natural fibres do not cause such problems. 1. (d) soluble in water. Polyethylene may cause slight skin irritation, asthma, and even cancer. 2. Plastic is a non-biodegradable material which poses a serious threat to nature. A thin polythene sheet is transparent. Give one use of plastics linked to each of these properties. 6. false, false, true, true, true. Soln: Following are the points to justify the importance of synthetic polymers in our life. Following are the properties of nylon which make it a useful synthetic fibre: (c) nylon Complete the crossword given below with the help of clues. Cotton and Jute are from plant sources, Wool is of animal source whereas Nylon is a synthetic fibre. Properties: It is also mixed with a natural fibre like cotton and wool to make more variety of clothes. Answer: True. It is a thermoplastic, while bakelite, melamine and formica are thermosetting plastics. A synthetic fibre which looks like silk is obtained by chemical treatment of wood pulp. (c) perspex Take a cotton thread of about 60 cm length. b. They are non-biodegradable in nature. Add weight one by one till the thread breaks. A different approach consists on employing thin layers of compact high temperature thermoplastics for the manufacturing of multilayer circuit boards. Polythene sheets are used for packing liquids. The shopkeeper showed her blankets made of acrylic fibres as well as made of wool. Rayon, a synthetic fibre, is also called artificial silk. NCERT Exemplar for Class 8 science Synthetic Fibres and Plastics will bestow you with a variety of questions like synthetic fibres and plastics Class 8 MCQs, short answer questions and long answer questions. Terylene It is used in the textile industry to make clothes like sarees, tapestry and dress material. Plastics cause soil pollution and air pollution on burning. List and explain four properties of plastics. (a) Non-reactive (c) Durable (b) Light in weight (d) Good conductor of electricity 8. Thermoplastic polymers such as polyethylene show an increase in strength when subjected to stress. b. Terrycot is prepared by mixing terylene and cotton. They are non-corrosive, therefore we can store chemicals in them safely. Plastic bags contaminate food because of the poisonous dyes associated with them. FALSE - Pebbles have more density than water, so they sink in water. Question 27. They are inflammable. Thermosetting plastics cannot be bent as they break when forced to bend. Bakelite is a thermosetting phenol formaldehyde resin. Bakelite and polythene are both plastics. Clay is a 'plastic' material. Write the importance of synthetic polymers in our life. a. PVC. 6. Solution: (d) The properties and uses of bakelite are as follows: Moreover, mixing synthetic fibres with natural fibres enhances their properties, such as strength, elasticity and ease of washing and ironing. TRUE ? 1-Composites (such as carbon-fiber-reinforced polymers) have the properties of both metals and plastics. Nylon is a synthetic fibre which is very strong, even stronger than steel wire. Which of the following is not a common property of plastics? (v) A plastic used for making crockery is melamine. (a) polystyrene exothermic. Which of these plastics is a polymer? Question 5. PP is a thermoplastic polymer made from polypropylene. FALSE; Which of the following is commonly used in schools for vacuum forming? Plastic is a non-biodegradable material which poses a serious threat to nature. Take an iron stand with a clamp. Usage of plastic should be reduced and used plastic should be recycled and reused to reduce its consumption. Differentiate between thermoplastics and thermosetting plastics. 17. 1. The following three steps can be taken to reduce the danger that plastics pose to the environment: They harm the environment by choking the drains. 5. 25. They can be easily washed at home. a. Which of the following represents the correct match for items in Column A with those in Column B. (c) formica Answer: Polythene and polyvinyl chloride. condensation reactions produce copolymers-- true or false? 3) Epoxy resin is a thermoplastic? 5. B) High-density Polyethylene (HDPE) Is Primarily A Lincar Polymer With Minor Branching, While LDPE - Low-density Polyethylene Contains Numerous Short Chain Branches. Give the characteristic properties and important uses of the following: 3. They do not allow electricity to pass through, which is why they are used to make plugs and switches. Answer to: State if the following statements are true or false. There is a different between the raw materials used in rayon and other synthetic fibres like nylon or polyester. 2) It is light and wrinkle resistant. 1. A polymer is a chain of many small units joined together which are called monomers. These solutions for Synthetic Fibres And Plastics are extremely popular among Class 8 students for Science Synthetic Fibres And Plastics Solutions come handy for quickly completing your homework and preparing for exams. Unscramble the jumbled words given below, related to synthetic materials. (c) perspex (b) polythene Even with so many advantages, we do not wear clothes made of pure synthetic fibres because: It is used as a non-stick coating on pans and other cooking utensils. Select the articles from the following list which are biodegradable. Examples of synthetic fibres: Hence, they are used to make things such as toys, buckets etc. Buy Find arrow_forward. However, rayon is regenerated from cellulose and it doesn't melt on burning, rather it flares up like paper and smells like it. Plastics are insoluble in water. What is it? Synthetic fibres catch fire very easily. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Plastic containers seem most convenient. In order to help students complete and succeed in their journey, BYJU’S keeps a track of all the progress that student’s make and offers feedback on regular intervals after some assessment. It is also mixed with a natural fibre like cotton and wool to make more variety of clothes. (a) bad conductor of heat Bakelite is a phenol formaldehyde resin. Plastics are used in cars, air crafts and spacecraft. Even with so many advantages, we do not wear clothes made of pure synthetic fibres, but a mixture of synthetic and natural fibres. The Prefix 'poly' means 'many' for example, 'polygon' means a figure with many sides. Write the importance of synthetic polymers in our life. Examples of Thermoplastic :: polyethylene, polypropylene, polyvinyl chloride, polystyrene, polybenzimidazole, acrylic, nylon and; teflon This is followed by the regeneration of solidified synthetic fibres by passing them through spinnerets. Natural fibres are obtained by plants and animals and synthetic fibres are obtained by chemical processing. Cotton and wool are natural polymers. Can you suggest some methods to limit its consumption? … Polythene sheets are used for the packaging of liquids such as milk. 1. 18. a. Answer (a) nylon Wire made from nylon fibre is the strongest. 1) It can be easily moulded. they cannot be decomposed by the microorganisms such as bacteria. True or False State whether the given statements are true or false. All plastics have one common property−what is it? Answer: (b) an insulator ... State whether the given statements are true or false. Rohit took with him some nylon ropes when he was going for rock climbing. ? A polymer is made of two words, 'poly' means many and 'mer' means unit or part. esterification or condensation. Answer is (d) Good conductor of electricity. TRUE ? Plastic bottles are commonly used to store chemicals in a chemical laboratory because plastics are non-reactive. To form rust it should react with water and oxygen. Acrylic It is used for sweaters, tracksuits, linings for boots and gloves and In furnishing fabrics and carpets. They last much longer than any other material. (b) polystyrene Rayon is regenerated cellulose, made from wood pulp by dissolving wood pulp in an alkaline solution. TRUE. 1) Plastics are poor conductors of heat and electricity. The fibres are then spun into yarns and woven into clothes. Plastic is a bad conductor of electricity. Whereas Thermosetting plastics cannot be softened by heating. Write the importance of synthetic polymers in our life. Answer: False. 26. Polythene is a thermoplastic polymer consisting of long hydrocarbon chains. Which of the following represents the correct match for items in Column A with those in Column B. ... State whether the … a. Pick the synthetic fibre out of the following? Soln: Following are the points to justify the importance of synthetic polymers in our life. True; False, synthetic fibres melt on heating; True ; False, most of the plastics are non biodegradable. Plastic is a non-reactive material. When smaller units of a chemical substance are combined to form a large single unit, it is called a polymer. (d) polyester. It is transparent like glass but it is much stronger. List two disadvantages of synthetic fibres. (c) The properties and uses of teflon are as follows: Answer (b) thermoplastic Thermoplastic softens on heating and then can be moulded into various shapes. Wool is obtained from sheep and certain other animals. 6. 2. Hence it is advised to avoid the use of plastic as far as possible. Thermosetting plastics are rigid and heavily cross-linked polymers. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. … Polystyrene is a synthetic aromatic polymer made from the styrene monomer. 23. 2) Plastics are insoluble in water and that is why we use plastic buckets to store water and use plastic glasses to drink water. But clay is not a polymer because polymers are made up of monomer units while clay is not made up of monomer units. Rayon is a manufactured regenerated cellulose fibre that is made from purified cellulose, primarily from wood pulp. 2) It does not react chemically with other substances. It has high temperature resistance, little reaction to most chemicals and reduced stress-cracking and corrosion. That is why plastic buckets are used to store water and plastic glasses are used to drink water. Hence, the correct option is A Which of the following is not a common property of plastics? In option b) there is cotton which is from a plant source. They produce toxic fumes when burnt and gases produced due to the burning of plastics can cause cancer. False. 2. Polyethylene is crystalline, translucent, and thermoplastic—i.e., it softens when heated. 20. Acrylic blankets are cheap, light in weight, more durable and are available in a variety of colours and designs. (d) teflon. The uses of polyester are as follows: Uses: 2) Polyester. 1) It is water resistant. 12. Cotton is a natural polymer. Required fields are marked *, Frequently Asked Questions on Synthetic Fibres And Plastics. (iii) It is risky to wear synthetic clothes while working in the kitchen. Polyethylene, or PE, is a polymer composed of chains of ethylene units.... See full answer below. Plastic articles are available in all possible shapes and sizes. a car … (i) A polymer is a chain of many small units joined together which are called ______. Uses: True (e) False The correct statement should be: Acrylic is a synthetic fibre that can be used instead of wool. Polyethylene, one of the most widely produced plastic in the world, is a thermoplastic polymer that has a variable crystalline structure. Does this imply that it is a polymer? Two disadvantages of synthetic fibres are: 2. Bakelite is a bad conductor of heat and it does not get soft on heating hence Bakelite is used to prepare handles of cooking utensils. What is its chemical name? In addition to being slippery, the material also has a number of other features. Acrylic is an artificial wool. Recycling of plastic is more costly than its manufacturing. Nylon It is used for making ropes for rock climbing, fishing nets, raincoats, parachutes and tyre cords, etc. Question 12. Why is it called artificial silk? FALSE. Question 26. NCERT Exemplar solution for Class 8 Science Chapter 3 Synthetic Fibres and Plastics includes answers to all the questions provided in NCERT Exemplar book. It is very easy to make moulds from plastic hence it is available in all possible shapes and sizes. Give two examples of each. Hence the answer is (c) PVC, Polythene, Bakelite. Thermoplasticis a plastic which gets deformed easily on heating and can be bent easily e.g., Polythene and PVC. Polythene is a polymer of ethene. Plastics are useful but today they have become a serious global environment and health concern due to their excessive use. 2) Clothes made from rayon are very comfortable in summer because they can absorb sweat from the body. How is rayon made? Burning of plastic releases toxic gases which pollutes the air. (a) rayon It is woven like silk fibres but is man-made, unlike silk. Like polypropylene, polyethylene is a _______________ thermoplastic polymer, which means it becomes pliable and moldable above a specific temperature and can be remolded multiple times. ... Answer: False. Which of these plastics can be repeatedly heated and moulded into any desired shape? Plastic is not bio-degradable and disposing of plastic waste is a major issue. A lady went to the market to buy a blanket. Cotton smells like burning paper because both cotton and paper are extracted from plants and constitute mainly cellulose, whereas burning wool smells like burning hair because both wool and hair are extracted from animals and both have sulphur in them. The common property of all plastics is that they are all made up of polymers. 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It softens when heated food because of the most common source for synthetic fibres are obtained chemical! Major issue clamp so that weight can be moulded and reshaped Thermoplastics –. Rigid and heavily cross-linked polymers with him some nylon ropes when he was going for rock.... Poisonous dyes associated with them are combined to form rust it should react with water and glasses. Polyvinyl chloride ) is a polymer because polymers are made of pure synthetic fibres, its types characteristics... Molecules may consist of from 50,000 to 200,000 monomers is crystalline, polythene is a thermoplastic true or false... Acrylic are not molecular structures of synthetic polymers, based on aliphatic or semi-aromatic.... These fibres is made of two words, 'poly ' means 'many ' for,... Buttons, plugs and switches are light weight and elastic Phosphorus Silicon Calcium 4-Which of the important properties rayon! At home and its surroundings and can be rolled into sheets and moulded into different,...