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Synthetic Fibres and Plastics Test - 17

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Synthetic Fibres and Plastics Test - 17
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  • Question 1
    1 / -0
    Artificial (man-made) wool is known by the name:
    Solution
    Acrylic is a synthetic fibre used for sweaters, shawls and blankets that resemble natural wool. So, artificial wool is also known by the name acrylic.
  • Question 2
    1 / -0
    Plastics find extensive use because it is:
    Solution
    Plastic finds extensive use because it is very light, strong, durable and can be moulded into different shapes and sizes.
  • Question 3
    1 / -0
    Which of the following is non biodegradable?
    Solution
    Biodegradation is the disintegration of materials by bacterial, fungi, or other biological means.
    Most plastics are derived from propylene, a simple chemical component of petroleum. 
    While cotton, paper, and leftover foodstuff are decomposable by bacterial action.
    So, option $$A$$ is correct.

  • Question 4
    1 / -0
    Rayon or artificial silk is obtained from :
    Solution
    Although rayon is obtained from a natural source wood pulp, yet it is a man made fibre.
  • Question 5
    1 / -0
    Which type of cloth dries faster in rainy season?
    Solution
    Synthetic fibers have unique characteristics which make them popular dress materials. They are durable, less expensive, readily available, and dry up quickly. So among given fibers, the only polyester is synthetic fiber and it can dry up faster.
    Cotton, wool, and silk are natural fibers and they need more time for drying than polyester.
    Hence, option $$C$$ is correct.
  • Question 6
    1 / -0
    What are the two types of arrangement in plastics ?
  • Question 7
    1 / -0
    Which material is used for making:
    (i) Saucepan handles
    (ii) Electric plugs/switches/plugboards
    Solution
    (i) Saucspan handles are made of bakelite as it is a bad conductor of heat.
    (ii)     Bakelite is also a bad conductor of electricity so the electric plugs, switches, etc. are made of it.
  • Question 8
    1 / -0
    Which of the following is a property of plastic?
    Solution
    Plastics as such are not flame resistant but thermosetting plastics are flame resistant. Plastics are non-corrosive and mouldable that is why they are used in kitchenware.
  • Question 9
    1 / -0
    What kind of material should be preferred for clothes during summer?
    Solution
    Cotton is a light-weight natural fibre and does not close the tissues as the synthetic fibre does. The cotton clothes have small opened pores that let the air pass through them and makes you feel cool in hot summer. 

    While on the other hand, synthetic fibre lock the body heat and sweat, which increases the body temperature and you feel hot inside. 
  • Question 10
    1 / -0
    Dress material terylene is essentially a/an:
    Solution
    Terylene is a popular polyester. Polyester is a synthetic fibre that remains crisp and easy to wash. So, it is quite suitable for making dress material.
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