Class 7 Exam > Class 7 Notes > Advance Learner Course: Science Class 7 > Important Questions: Synthetic Fibers And Plastics
Class 7 Science Important Question Answers - Synthetic Fibres and Plastics
Q.1 Name some natural fibres?
Answer: Fibres obtained from plants or animals is called natural fibres for examples cotton, wool, silk, etc.
Q2. What do you mean by synthetic fibres?
Answer: Fibres made by human beings using chemical substance is called synthetic fibre. A synthetic fibre is a chain of small unit of chemical substance joined together. These small units combine to form a large single unit called a polymer. The word ‘polymer’ comes from two Greek words; poly meaning many and mer meaning part/unit. So, a polymer is made of many repeating units.
Q3. Name a polymer occurs naturally?
Answer: Polymers that occur naturally is cellulose. Cellulose is made up of a large number of glucose units.
Polymer
Q4. Name a fibre having properties similar to that of silk.
Answer: Rayon.
Q5. Although rayon is obtained from a natural source, wood pulp, yet it is a man-made fibre. Why?
Answer: This is because rayon is obtained by chemical treatment of wood pulp.
Q6. Why does Nylon become very popular for making clothes for mankind?
Answer: Nylon is the first fully synthetic fibre prepared from coal, water and air in 1931. Nylon fibres are strong, elastic and light. It is lustrous and easy to wash. So, it became very popular for making clothes.
Q7. Is nylon fibre really so strong that we can make nylon parachutes and ropes for rock climbing?
Answer: Yes, It is because nylon thread is actually stronger than a steel wire.
Q8. Why does polyester fibre quite suitable for making dress material?
Answer: Fabric made from Polyester fibre does not get wrinkled easily. It remains crisp and is easy to wash. So, it is quite suitable for making dress material. Terylene is popular polyester.
Q9. Name a form of polyster which is used for making bottles, utensils, films, wires and many other useful products?
Ans: PET: PET (polyethylene terephthalate) is made from two monomers, terephthalic acid and ethylene glycol, by the process called condensation polymerization
Q10. Name the chemical used to make polyster?
Answer: Esters are the chemicals used to make polyster.
Q11. Why synthetic fibres are more popular than natural fibres?
Answer: Synthetic fibres dry up quickly, durable, less expensive, readily available and easy to maintain which makes them more popular than natural fibres.
Q12. Identify the Synthetic fibre appears to resemble wool?
Answer: acrylic.
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FAQs on Class 7 Science Important Question Answers - Synthetic Fibres and Plastics
| 1. What are synthetic fibers and plastics? |  |
Ans. Synthetic fibers are man-made fibers that are produced through chemical processes. They are designed to mimic natural fibers and are commonly used in the textile industry for making clothes, upholstery, and other fabric-based products. Plastics, on the other hand, are synthetic materials made from polymers, which are large molecules composed of repeating subunits. They are versatile and can be molded into various shapes, making them useful in a wide range of applications, such as packaging, construction, and electronics.
| 2. What are the advantages of using synthetic fibers and plastics? | |
Ans. There are several advantages of using synthetic fibers and plastics. Firstly, they are generally more durable and resistant to wear and tear compared to natural fibers. They also have better resistance to moisture, chemicals, and sunlight, making them suitable for outdoor applications. Additionally, synthetic fibers and plastics are often more affordable and easier to produce in large quantities, making them widely available for various purposes.
| 3. Are synthetic fibers and plastics harmful to the environment? | |
Ans. While synthetic fibers and plastics offer many benefits, their production and disposal can have negative impacts on the environment. The production of synthetic fibers and plastics involves the use of fossil fuels and chemicals, which contribute to greenhouse gas emissions and pollution. Moreover, when improperly disposed of, synthetic fibers and plastics can take hundreds of years to decompose, leading to litter and pollution in landfills, oceans, and other ecosystems.
| 4. Can synthetic fibers and plastics be recycled? | |
Ans. Yes, synthetic fibers and plastics can be recycled, but the process can be more challenging compared to recycling natural materials. Some types of synthetic fibers, such as polyester and nylon, can be mechanically recycled by melting and reshaping them into new products. Plastics can also be recycled through various processes, including mechanical recycling, chemical recycling, and energy recovery. However, the effectiveness of recycling depends on the type and quality of the synthetic fiber or plastic, as well as the availability of recycling facilities.
| 5. What are some alternatives to synthetic fibers and plastics? | |
Ans. In recent years, there has been a growing interest in finding alternatives to synthetic fibers and plastics to reduce their environmental impact. Some alternatives to synthetic fibers include natural fibers like cotton, hemp, and bamboo, which are biodegradable and renewable. As for plastics, bio-based plastics made from renewable resources, such as cornstarch or sugarcane, are gaining popularity. Additionally, there is a focus on developing more sustainable packaging materials, such as compostable and biodegradable options, as well as encouraging the use of reusable products to reduce plastic waste.
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