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Synthetic Fibres and Plastics Test - 10

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Synthetic Fibres and Plastics Test - 10
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Weekly Quiz Competition
  • Question 1
    1 / -0

    Use the following information to answer the next question.

    The given table lists some wastes and the approximate time for their degradation.

    Type of waste

    Approximate time for degradation

    Paper

    10 − 30 days

    Wood

    10 − 15 years

    Cotton clothes

    2 − 5 months

    Metal cans

    100 − 500 years

    Which of the following wastes is non-biodegradable?

    Solution

    Substances which are not easily decomposed by biological processes and also take a long time to decompose are called non-biodegradable substances. Metals take a lot of time to decompose into smaller and simpler substances. Hence, metal cans are non-biodegradable.

    The correct answer is C.

  • Question 2
    1 / -0

    Which of the following statements regarding thermoplastics and thermosetting plastics is incorrect?

    Solution

    Bakelite, when moulded once, cannot be softened by heating. Hence, bakelite is a thermosetting plastic.

    The correct answer is A.

  • Question 3
    1 / -0

    Use the following information to answer the next question.

    In environmental science class, a student learns that the 4R principle is used to protect the environment. The teacher asked a student to name the four R’s in the 4R principle. The student correctly gives the name for three ‘R’s as Reduce, Reuse, and Recycle. However, the student cannot name the last ‘R’.

    What does the fourth ‘R’ stand for?

    Solution

    The 4R principle should be used to protect the environment. The four ‘R’s in the 4R principle stand for Reduce, Reuse, Recycle, and Recover. Thus, the fourth ‘R’ stands for Recover.

    The correct answer is C.

  • Question 4
    1 / -0

    Which of the following fibres is not a natural fibre?

    Solution

    Nylon is a synthetic fibre. It is strong, elastic, and light in nature. It is used to make fabrics, ropes, etc.

    The correct answer is C.

  • Question 5
    1 / -0

    Silk was first discovered in

    Solution

    Silk was first discovered in China by a Chinese princess. It was kept a secret for a long time in China.

    The correct answer is B.

  • Question 6
    1 / -0

    Which of the following fibres is a polymer called cellulose?

    Solution

    Fibres are polymers. These are made of smaller units called monomers that are chained together to form large molecules. Polymers exist in nature also. Cotton is a natural polymer called cellulose. Cellulose is a large molecule made of smaller glucose units.

    The correct answer is D.

  • Question 7
    1 / -0

    Which of the following fibres is a synthetic fibre?

    Solution

    Synthetic fibres are those which are made by human beings. Nylon was the first synthetic fibre, which was discovered in 1931.

    The correct answer is B.

  • Question 8
    1 / -0

    Which of the following synthetic fibres is also known as ‘artificial silk’?

    Solution

    Rayon is a natural fibre obtained by a chemical treatment of wood pulp. It has properties similar to that of silk. Hence, it is called ‘artificial silk’. Rayon is obtained from a natural source, yet it is a man-made fibre.

    The correct answer is A.

  • Question 9
    1 / -0

    Which of the following properties of synthetic fibres is a disadvantage for it?

    Solution

    Synthetic fibres melt on heating. Thus, if clothes made of synthetic fibres catch fire, it can be disastrous. The fabric melts and sticks to the skin. Therefore, they should not be worn while working in the kitchen.

    The correct answer is D.

  • Question 10
    1 / -0

    Which of the following statements is a disadvantage for plastics?

    Solution

    Plastics are non-biodegradable. This means that they cannot be decomposed into simpler and harmless substances by biological processes.

    The correct answer is C.

  • Question 11
    1 / -0

    Which of the following fabrics is very similar to wool?

    Solution

    Many sweaters, shawls, and blankets that we use are not made from natural wool. They are prepared with a synthetic fibre called acrylic, which closely resembles wool.

    The correct answer is C.

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