{"id":12937,"date":"2023-03-25T13:45:41","date_gmt":"2023-03-25T08:15:41","guid":{"rendered":"https:\/\/ncertsolutions.guru\/?p=12937"},"modified":"2023-03-25T17:17:03","modified_gmt":"2023-03-25T11:47:03","slug":"synthetic-fibres-and-plastics-class-8-extra-questions","status":"publish","type":"post","link":"https:\/\/ncertsolutions.guru\/synthetic-fibres-and-plastics-class-8-extra-questions\/","title":{"rendered":"Synthetic Fibres and Plastics Class 8 Extra Questions and Answers Science Chapter 3"},"content":{"rendered":"

Synthetic Fibres and Plastics Class 8 Extra Questions and Answers Science Chapter 3 PDF are solved by experts and will guide students in the right direction. Students can get how to tackle different questions easily by solving the Extra Questions for Class 8 Science<\/a> Question bank on a regular basis.<\/p>\n

Class 8 Science Chapter 3 Extra Questions and Answers Synthetic Fibres and Plastics<\/h2>\n

Extra Questions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics with Answers<\/strong><\/p>\n

Synthetic Fibres and Plastics Class 8 Extra Questions Very Short Answer Type<\/h3>\n

Question 1.
\nName a synthetic fibre which is used in making cheap and durable woollen clothes.
\nAnswer:
\nAcrylic.<\/p>\n

\"Synthetic<\/p>\n

Question 2.
\nGive one-word answer for the following :
\nPlastic which gets deformed easily on heating and can be easily bent.
\nAnswer:
\nThermoplastic<\/p>\n

Question 3.
\nComplete the sentence:
\nRayon is not a synthetic fibre because ____________.
\nAnswer:
\nit is obtained from a natural source.<\/p>\n

Question 4.
\nWhen was nylon made ?
\nAnswer:
\nNylon, a man-made fibre, was made in 1931.<\/p>\n

Question 5.
\nWhich one is stronger : a nylon wire or a steel wire ?
\nAnswer:
\nNylon wire.<\/p>\n

Question 6.
\nWhat is the disadvantage of synthetic fibre ?
\nAnswer:
\nThe synthetic fabric melts on heating, which is a disadvantage of this fabric.<\/p>\n

Question 7.
\nFrom which material, all synthetic fibres are prepared ?
\nAnswer:
\nSynthetic fibres are prepared from petrochemicals.<\/p>\n

Question 8.
\nWhat are manufactured from thermoplastics ?
\nAnswer:
\nToys, combs, car grills and various types of containers are manufactured from thermoplastics.<\/p>\n

\"Synthetic<\/p>\n

Question 9.
\nWhat are the characteristics of plastic due to which it is used to manufacture variety of articles?
\nAnswer:<\/p>\n

    \n
  1. They have lightweight<\/li>\n
  2. lower price<\/li>\n
  3. good strength, and<\/li>\n
  4. are easy to handle.<\/li>\n<\/ol>\n

    Question 10.
    \nWhy is Plastic covering used in electric wires?
    \nAnswer:
    \nIt is because plastic is a poor conductor of electricity.<\/p>\n

    Question 11.
    \nWhy are handles of frying pans, cookers are made of plastic material ?
    \nAnswer:
    \nIt is so because plastic material is poor conductor of heat.<\/p>\n

    Question 12.
    \nWhy is plastic not environment friendly?
    \nAnswer:
    \nSince plastic takes several years to decompose, it is not environment friendly.<\/p>\n

    Synthetic Fibres and Plastics Class 8 Extra Questions Short Answer Type 1<\/h3>\n

    Question 1.
    \nExplain, why the handles of cooking utensils, electric plugs, switches or plugboards are made of thermosetting plastics?
    \nAnswer:
    \nThe handles of cooking utensils, electric plugs, switches or plugboards are made of thermosetting plastics because:
    \n(a) Thermosetting plastics cannot be softened by heating.
    \n(b) They are poor conductor of heat and electricity.
    \n(c) They resist fire and can tolerate heat.<\/p>\n

    \"Synthetic<\/p>\n

    Question 2.
    \nWhat are the characteristic properties of synthetic fibres, due to which they are used abundantly?
    \nAnswer:
    \nSynthetic fibres possess the following unique characteristics :<\/p>\n

      \n
    1. They dry up soon,<\/li>\n
    2. They are durable,<\/li>\n
    3. They are less expensive,<\/li>\n
    4. They are readily available, and<\/li>\n
    5. They are easy to maintain.<\/li>\n<\/ol>\n

      Question 3.
      \nWhat is melamine? What are its uses?
      \nAnswer:
      \nMelamine is a versatile thermosetting plastic. It resists fire and can tolerate heat better than other plastics. It is used for making floor tiles, kitchenware and fabrics which resists fire.<\/p>\n

      Question 4.
      \nWhat is the characteristic property of plastic due to which it is used to make containers to store different materials?
      \nAnswer:
      \nPlastics do not react with water and air and, therefore, they are non-corrosive in : nature. That is why, the containers made of plastics are used for storing various kinds of materials, including many chemicals.<\/p>\n

      Question 5.
      \nWrite a brief note on teflon.
      \nAnswer:
      \nTeflon is a non-stick plastic used as non-stick coating in cookware. Because of its toughness, it is also used as tape for sealing purposes.<\/p>\n

      Synthetic Fibres and Plastics Class 8 Extra Questions Short Answer Type 2<\/h3>\n

      Question 1.
      \nWrite a note on cross-linked plastic.
      \nAnswer:
      \nCross-linked plastic is that plastic in which its units possess cross-linked arrangements. The cross-linked plastics are available in all possible shapes and sizes. This is due to the fact that plastics are easily mouldable, i.e., plastic can be shaped in any form. That is why, various types of containers like water tank, water jug, bucket, mug, etc. are made of it arid used in day-to-day life.<\/p>\n

      \"Synthetic<\/p>\n

      Question 2.
      \nWrite a short note on the plastic in healthcare industry.
      \nAnswer:
      \nPlastics find extensive use in the healthcare industry. Some examples of their use in healthcare are in packaging of medicines threads used for stitching wounds, syringes, gloves, a number of medical instruments, etc.<\/p>\n

      Question 3.
      \nWrite any five characteristics of synthetic fibres.
      \nAnswer:
      \nThe characteristics of synthetic fibers are :
      \n(a) Synthetic fibres are cheaper than natural fibre.
      \n(b) Synthetic fibres are stronger than natural fibre.
      \n(c) Synthetic fibres are more durable than natural fibre.
      \n(d) Synthetic fabrics are dried up in less time.
      \n(e) Synthetic fibres are easy to maintain and wash.
      \n(f) Synthetic fibres are readily available and easy to maintain.<\/p>\n

      Synthetic Fibres and Plastics Class 8 Extra Questions Long Answer Type<\/h3>\n

      Question 1.
      \nWrite a note on rayon.
      \nAnswer:
      \nNatural silk from silkworm was discovered in China and was kept as a closely guarded secret for a long time. Silk was a costly fabric. But, as its texture was beautiful, it fascinated everybody. So, people began to think of preparing silk artificially.<\/p>\n

      Towards the end of the nineteenth century, scientists were successful in obtaining a fibre having the properties similar to that of silk. Such a 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, but can be woven like silk fibres. It can also be dyed in a wide variety of colours.<\/p>\n

      \"Synthetic<\/p>\n

      Question 2.
      \nWhat are renewable and non-renewable sources of energy? What will happen if all the non-renewable resources get exhausted?
      \nAnswer:
      \nRenewable sources of energy:
      \nThe sources of energy, which are being produced continuously in nature and are inexhaustible, are called renewable sources of energy. These sources of energy can be used again and again, endlessly. They will never get exhausted. For example, wind, sunlight.<\/p>\n

      Non-renewable sources of energy :
      \nThe sources of energy, which have accumulated in nature over a very, very long time and cannot be quickly replaced when exhausted, are called non-renewable sources of energy, e.g., coal. If all non-renewable sources of energy get exhausted, we will have to depend on renewable sources of energy. More and more alternative sources will have to be developed.<\/p>\n

      Question 3.
      \n(a) You have to buy clothes to wear in summer. You will prefer to buy cotton clothes or clothes made of synthetic material. Give reason for your answer.
      \n(b) Which material is better for making umbrella and why ?
      \nAnswer:
      \n(a) I will prefer to buy cotton clothes over synthetic clothes. This is because cotton clothes absorb more sweat than synthetic clothes. I will comfortable and cool in cotton clothes than synthetic clothes.
      \n(b) Synthetic cloth is better for making an umbrella because<\/p>\n

        \n
      1. Synthetic fibre is more durable.<\/li>\n
      2. Synthetic fibre is stronger.<\/li>\n
      3. Synthetic fibre absorb less water.<\/li>\n
      4. Synthetic fibre is lightweight as compared to cotton cloth.<\/li>\n<\/ol>\n

        Question 4.
        \n\u201cEven though plastics are very useful, they are not environment friendly.\u201d Justify the statement.
        \nAnswer:
        \nEven though plastics are very useful and have vital applications in our daily life but they are not environment friendly because :
        \n(\u0430) The plastics are not bio-degradable and take several years to decompose. It causes environmental pollution.
        \n(b) 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.<\/p>\n

        Hope the knowledge provided regarding the Synthetic Fibres and Plastics Class 8 Extra Questions and Answers has helped you to the possible extent. For more info feel free to reach us and we will guide you at the earliest possibility. Stay connected to our site to avail latest updates on Extra Questions for Various Classes instantly.<\/p>\n","protected":false},"excerpt":{"rendered":"

        Synthetic Fibres and Plastics Class 8 Extra Questions and Answers Science Chapter 3 PDF are solved by experts and will guide students in the right direction. Students can get how to tackle different questions easily by solving the Extra Questions for Class 8 Science Question bank on a regular basis. Class 8 Science Chapter 3 …<\/p>\n

        Synthetic Fibres and Plastics Class 8 Extra Questions and Answers Science Chapter 3<\/span> Read More »<\/a><\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":""},"categories":[7],"tags":[],"yoast_head":"\nSynthetic Fibres and Plastics Class 8 Extra Questions and Answers Science Chapter 3 - NCERT Solutions<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/ncertsolutions.guru\/synthetic-fibres-and-plastics-class-8-extra-questions\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Synthetic Fibres and Plastics Class 8 Extra Questions and Answers Science Chapter 3 - NCERT Solutions\" \/>\n<meta property=\"og:description\" content=\"Synthetic Fibres and Plastics Class 8 Extra Questions and Answers Science Chapter 3 PDF are solved by experts and will guide students in the right direction. 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