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Synthetic Fibres and Plastics Test - 15

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Synthetic Fibres and Plastics Test - 15
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Ropes made of _______ are used in cranes and lifts.
    Solution
    Nylon ropes are used in cranes and lifts because they are strong, elastic, and light. Nylon ropes are among the strongest ropes in common use. It is used for absorbing shock loads, such as when lifting or towing because it has the ability to return to its original length after being stretched. In fact, nylon threads are actually stronger than steel wires.
  • Question 2
    1 / -0
    Which of the following is used for making parachutes and stockings?
    Solution
    Nylon remains the most popular material. 
    More specifically, parachutes are made of "ripstop" nylon that is woven with a double or extra-thick thread at regular intervals, creating a pattern of small squares.
    Nylon is used for making parachutes and stockings as it is strong, elastic, and lightweight.
    Therefore, option B is correct.
  • Question 3
    1 / -0
    Which of the following is a natural fibre?
    Solution
    Woollen fabric is processed from natural materials such as fleece of sheep and goats. Wool is, therefore, a natural fibre..
    On the other hand, polythene, PVC and nylon are made by man using chemicals. They are, therefore, called synthetic or artificial fibre. 

    Hence, option $$D$$ is correct.
  • Question 4
    1 / -0
    Which is generally a bad conductor of electricity?
    Solution
    Plastics are poor conductors of both heat and electricity. Iron, copper and gold being metals are good conductors of heat and electricity.
  • Question 5
    1 / -0
    Which of the following applications indicates that plastics are bad conductors of electricity?
    Solution
    Plastic does not allow electricity to pass through it, thus, is a bad conductor of electricity and is used as an insulator.
    That's the reason why they are used to insulate electrical wires and prevent electrical shocks.
    Plastics are light, durable, and bad conductors of heat and non-reactive. This makes them ideal for use as plastic foam core, handles of cooking pans and packaging material.
    So, option B is correct.
  • Question 6
    1 / -0
    $$X$$ is a thread or filament from which $$Y$$ is made. If prepared from plants and animals, it is known as $$Z$$ fibres whereas by humans it is known as $$W$$ fibres. Artificial or synthetic fibres are nylon, rayon, polyester, acrylic, etc.

    What is $$Z$$?
    Solution
    Fibre is the basic unit of raw material having a suitable length, and strength for conversion into yarns and further into fabrics/cloth/material. 

    Fibres can occur naturally or can be produced artificially. 

    Here, X is a fibre, Y is the cloth/fabric. Z is the natural fibre and W is the artificial or human-made fibre.

    Plant and animal fibres are natural fibres, and artificial fibres are man-made fibres such as rayon.

    Therefore, option B is correct.
  • Question 7
    1 / -0
    Which of the following takes a long time to decompose?
    Solution
    Non-biodegradable materials are not decomposed by natural factors like micro-organisms, UV radiations, etc. They stay longer and are difficult to degrade.
    Jute, cotton and wool are made from natural fibre and are, therefore, biodegradable while plastic is a synthetic polymer and is a non-biodegradable waste.
    So, option D is correct
  • Question 8
    1 / -0
    The small fluffy fibres are:
    Solution
    Burrs are the small filthy fibers. This has a pattern of knots. 
  • Question 9
    1 / -0
    Which of the following will be suitable for coating dress materials of fire - men ?
    Solution
    Melamine have properties to interfere with the combustion in many different ways. Moreover, it can withstand high temperature, it is corrosion resistant and easy to handle.
  • Question 10
    1 / -0
    Electrical wires have a coating of an insulated material. The material generally used is:
    Solution
    Insulators are the material which does not allow the flow of electric current. Therefore, insulators are used to coat electrical wires to avoid severe accidents.
    PVC is an abbreviated form of polyvinyl chloride. The electrical characteristics of PVC such as electrical insulating properties or dielectric constant are excellent and hence, are used as insulating materials.
    Graphite is a good conductor of electricity therefore it cannot be used for insulating electrical wires.
    Sulphur also has insulating property but it cannot be used for insulating electrical wires because of its brittle nature.
    So the correct option is C.
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