30 seconds . Comment. Which fabric is also known as artificial silk? Alternating warp and weft threads. Infrared range for fiber optics . Another way to prevent getting this page in the future is to use Privacy Pass. They do not allow enough circulation of air either. • b. Polyvinyl chloride (PVC) c. Teflon. Want to see this answer and more? (A) Brilliance of diamond (B) Mirage formation (C) Optical fibre working (D) Rainbow formation. SURVEY . State one disadvantage of using synthetic fibres for making clothes. This means cutting a lot of trees, which leads to deforestation. Answer: Protein Question 3. 3. Deficiency of Vitamin D causes increased loss of Ca++ in urine Which of the statements given above are correct? Bakelite is a- synthetic polymer — plastic. Question. 5. Name the plastic used to make bottles. Join now. Synthetic fibres can either be completely synthetic or semisynthetic. 30 seconds . Passage - 1 For thousands of years natural fibres were the only ones available for making fabrics. d. 400 – 7000 nm … 8. Answer: Jute fibre is obtained from jute plant by the following steps: Retting: Jute fibre is obtained from the stalks of the jute plant. Which of the following is Synthetic fibre? c. 300 – 2000 nm . Which of the following is a characteristic of a synthetic fibre? This means cutting a lot of trees, which leads to deforestation. NCERT Class 8 Science Unit 3 is for Synthetic Fibres and Plastics. Explain the difference between thermoplastic and thermosetting plastics. They are manmade and have a linear arrangement and are used to make products like toys, combs and containers. 3. answer choices . —– synthetic ——-fibre on burning, smells like burning paper. Question. (a) Bakelite (c) Wool (c) Nylon (d) Cotton. Conservation of Plants and Animals, Chapter 9. NCERT Exemplar Class 8 Science Unit 3 Synthetic Fibres and Plastics. Notes and Exercise on Crop and Production Management Synthetic Fibres and Plastics Class 8 MCQs Questions with Answers. Cellulose occurs in … Plain Weave Pattern. Terrycot. nylon. (Inme se konsa Synthetic fibre hei?) A. cotton . (a) Synthetic fibres catch fire very easily. A. The following properties pertain to which fiber: high elongation,affected by sunlight, low absorbency, and high elastic recovery nylon This fiber was created as a wool substitute and is soft, warm, resilient and great for making lightweight blankets? It was prepared from coal, water and air Synthetic fibres are man-made fibres that come from chemical resources. a. Styrofoam. 1. Such fibres which are made from chemical substances are called synthetic fibres. Answer – Yes, it is true that the manufacturing of synthetic fibres is actually helping in the conservation of forests because nature fibre is mainly derived from plants. Question 1: Define synthetic fibre? It is very easy to grow. The fibres which are obtained by blending natural and synthetic fibres are called (a) joint fibres (b) mixed fibres (c) real fibres (d) artificial fibres 2. […] s. Log in for more information. (3) Give reason for the following (a) polyester is not suitable for summer (b) use of plastic today is a matter of concern (c) nylon derives its name from two cities (d) plastic is … Which of the following is a bad conductor of electricity? Log in. Your IP: 45.55.196.194 Answer: Some salient features of rayon are as follows: Rayon is … Answer: (D) Incident at an angle greater than the critical angle. A full revision with question-answer and explanation in the form of MCQs based on latest CBSE Syllabus for new academic session 2020-2021. If you are on a personal connection, like at home, you can run an anti-virus scan on your device to make sure it is not infected with malware. pick the synthetic fibre out of the following. Students who are in Class 8 or preparing for any exam which is based on Class 8 Science can refer NCERT Science Book for their preparation. Synthetic fibres are of four types, namely: Rayon; Nylon; Polyester; Acrylic; Rayon B) Nylon done clear. Answer: Nylon, terylene, PET, acrylic, teflon, etc. So clothes made of synthetic fibres are not comfortable to wear as they do not allow sweat to evaporate easily. (c) Wool pulp Explain the difference between thermoplastic and thermosetting plastics. It is the first fully synthetic fibre. Preview (22 questions) Show answers. a. 2 Which of the following is a source of rayon? Which of the following is a bad conductor of electricity? Which of the following is a synthetic fiber? c. 300 – 2000 nm . ANSWER: (b) Photonic bandgap fiber. For example, polyester, nylon, and acrylic etc. We have provided Synthetic Fibres and Plastics Class 8 Science MCQs Questions with Answers to help students understand the concept very well. The plastic is first melted at high temperature and then forced out through a device with many holes in it known as a spinneret. Multiple Choice Questions Question. (a) Acrylic (b) Nylon (c) Polyester (d) Rayon. Friction, Chapter 14. Force and Pressure Ungraded . 30 seconds . Want to see the step-by-step answer? Which of the following is used for making gunny … This answer has been confirmed as correct and helpful. Deficiency of Vitamin B, can lead to indigesion and heart enlargement 3. Free PDF Download of CBSE Science Multiple Choice Questions for Class 8 with Answers Chapter 3 Synthetic Fibres and Plastics. All questions and answers from the Living Science 2019 2020 Book of Class 8 Science Chapter 3 are provided here for you for free. MCQ Questions for Class 8 Science: Ch 3 Synthetic Fibres and Plastics 700 – 1200 nm . Class 8 Synthetic Fibres And Plastics CBSE Questions & Answers This is Science Class 8 Synthetic Fibres and Plastics CBSE Questions & Answers. Play this game to review Other. In contrast, nylon is a synthetic fibre obtained from plastics derived from petroleum. A full revision with question-answer and explanation in the form of MCQs based on latest CBSE Syllabus for new academic session 2020-2021. 1. B) Nylon done clear. Which of the following is not due to total internal reflection of light? Answer: There is a disadvantage with synthetic fibers that synthetic fibers melt on heating. Spandex. Chapter 12. Answer: Fibre which is made by humans is called synthetic fibre. Polyester. - 15864661 Fill in the blanks with appropriate words: 1. More Exercises on Our Universe, Chapter 18. There are 15 questions in this test with each question having around four answer choices. Synonyms, crossword answers and other related words for SYNTHETIC FIBRE [nylon] We hope that the following list of synonyms for the word nylon will help you to finish your crossword today. Answers: 1: (b) Nylon Explanation: It is a synthetic fibre. (a) Plastic (b) Copper (c) Steel (d) Brass. Which synthetic fibre is called artificial silk? From the NCERT Exemplar Class 8 Science Unit 3, candidates can understand the level and type of questions that are asked in the exam. Answer – Yes, it is true that the manufacturing of synthetic fibres is actually helping in the conservation of forests because nature fibre is mainly derived from plants. Comments. From the NCERT Exemplar Class 8 Science Unit 3, candidates can understand the level and type of questions that are asked in the exam. Plastic which cannot be melted and moulded repeatedly? Name some artificial fibres. Cotton and wool are both obtained naturally in the fibrous form and no artificial methods are necessary to get these fibres. Question. Sol. Choose the correct option in the following questions: Performance & security by Cloudflare, Please complete the security check to access. The fabric melts and sticks to the body of the person wearing it. a. Download CBSE Class 8 Science Synthetic Fibres and Plastics MCQs in pdf, Science chapter wise Multiple Choice Questions free, Chapter 3Synthetic Fibres and Plastics 1 A chain of small chemical units combined to form a large single unit is called ____a) Polymerb) Polyc) Polythene Fabrics made from which of the following fibres is most suitable as umbrella cloth? Along with it, the answer for each question has also been provided. 400 – 700 nm . a. 103. Answer the following questions in short: 1. (b) Nylon Is a synthetic fibre. 2. 2. Join now. Answer: (D) Rainbow formation. Preview this quiz on Quizizz. Confirmed by yumdrea [6/10/2016 7:55:00 PM], Rated good by yumdrea. Answer the following questions in short: 1. Infrared range for fiber optics . Synthetic Fibres and Plastics Class 8 Extra Questions Science Chapter 3 Synthetic Fibres and Plastics Class 8 Extra Questions Very Short Answer Questions Question 1. Terylene is a polyester and nylon, a poyamide. Acrylic is a synthetic fibre resembling wool used to knit sweaters, socks, and shawls.Polystyrene is also a synthetic fibre used for making protective packagings such as packing peanuts and CD and DVD cases, containers such as clamshells, lids, bottles, trays, tumblers, disposable cutlery and in the making of models.Therefore, option C and D both are correct. Nylon or Jute at an angle greater than the critical angle for new academic session.... Answer ( c ) polyester ( d ) Brass PET, acrylic, teflon etc... ) Wood pulp ( which contains cellulose ) of MCQs based on latest CBSE for!: Thermoplastics are those Plastics which can be used as a substitute for Wool causes loss... Explain how Jute is obtained from the Chrome web Store, Chapter.! Be melted and moulded repeatedly of Jute plants are bundled together and soaked in water for about days. To provide step-by-step solutions in as fast as 30 minutes Rated good by [. 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