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7th std CBSE science book, lesson Fibre to Fabric" Mcq , true or false, short answer, brief,


7th std CBSE science book lesson Fibre to Fabric"

20 MCQs

  1. Which of the following is a natural fibre?
    a) Nylon
    b) Wool
    c) Polyester
    d) Acrylic
    Answer: b) Wool

  2. What is the main source of wool?
    a) Cotton plant
    b) Sheep
    c) Silkworm
    d) Coconut
    Answer: b) Sheep

  3. Which fibre is used to make jute bags?
    a) Cotton
    b) Silk
    c) Jute
    d) Nylon
    Answer: c) Jute

  4. Which process is used to convert fibres into fabric?
    a) Spinning
    b) Weaving
    c) Both spinning and weaving
    d) None of these
    Answer: c) Both spinning and weaving

  5. What is the process of spinning?
    a) Turning yarn into threads
    b) Arranging two sets of yarn
    c) Turning fibres into yarn
    d) All of the above
    Answer: c) Turning fibres into yarn

  6. Which of these fibres is obtained from the cocoon of silkworms?
    a) Cotton
    b) Jute
    c) Silk
    d) Wool
    Answer: c) Silk

  7. Which plant is the primary source of cotton?
    a) Jute
    b) Cotton plant
    c) Coconut tree
    d) Mulberry
    Answer: b) Cotton plant

  8. Which of the following is used for weaving fabrics?
    a) Threads
    b) Yarn
    c) Cotton
    d) Wool
    Answer: b) Yarn

  9. Which fibre is obtained from the hair of animals like goats, camels, and sheep?
    a) Silk
    b) Wool
    c) Cotton
    d) Jute
    Answer: b) Wool

  10. What is the main function of a loom?
    a) Weaving
    b) Spinning
    c) Cutting fabric
    d) Dyeing
    Answer: a) Weaving

  11. Which of these is a synthetic fibre?
    a) Cotton
    b) Wool
    c) Silk
    d) Nylon
    Answer: d) Nylon

  12. What is jute commonly used for?
    a) Clothes
    b) Bags and ropes
    c) Silk garments
    d) Cotton bedsheets
    Answer: b) Bags and ropes

  13. Which of the following is NOT a natural fibre?
    a) Cotton
    b) Jute
    c) Polyester
    d) Wool
    Answer: c) Polyester

  14. What is obtained from the cocoon of the silkworm?
    a) Wool
    b) Silk
    c) Cotton
    d) Jute
    Answer: b) Silk

  15. Which of these is NOT a fibre?
    a) Cotton
    b) Jute
    c) Wood
    d) Wool
    Answer: c) Wood

  16. What is the primary use of synthetic fibres?
    a) Fabric production
    b) Paper production
    c) Construction
    d) Woodwork
    Answer: a) Fabric production

  17. Which of the following is an example of a natural fibre obtained from plants?
    a) Silk
    b) Cotton
    c) Nylon
    d) Acrylic
    Answer: b) Cotton

  18. What is the purpose of shearing in wool production?
    a) Removing fleece from sheep
    b) Spinning wool
    c) Dyeing wool
    d) Weaving wool
    Answer: a) Removing fleece from sheep

  19. Which of the following is a product of spinning?
    a) Yarn
    b) Fabric
    c) Thread
    d) All of the above
    Answer: a) Yarn

  20. Which of the following is used to make synthetic fibres?
    a) Plants
    b) Animals
    c) Chemicals
    d) All of the above
    Answer: c) Chemicals

20 True/False

  1. True/False: Wool is obtained from the silk of a silkworm.
    Answer: False

  2. True/False: Cotton is a natural fibre.
    Answer: True

  3. True/False: Silk is a synthetic fibre.
    Answer: False

  4. True/False: Jute is obtained from the bark of trees.
    Answer: False

  5. True/False: Spinning is the process of converting fibres into yarn.
    Answer: True

  6. True/False: Wool is obtained from the hair of animals.
    Answer: True

  7. True/False: Nylon is a synthetic fibre made from plants.
    Answer: False

  8. True/False: Jute is used to make ropes and sacks.
    Answer: True

  9. True/False: The process of weaving involves arranging two sets of yarns to form fabric.
    Answer: True

  10. True/False: Cotton is harvested from the seeds of the cotton plant.
    Answer: True

  11. True/False: Silk is obtained from the cocoon of the silkworm.
    Answer: True

  12. True/False: Wool is a synthetic fibre.
    Answer: False

  13. True/False: The yarn is used for knitting and weaving.
    Answer: True

  14. True/False: Spinning and weaving are the two main processes involved in fabric making.
    Answer: True

  15. True/False: Synthetic fibres are biodegradable.
    Answer: False

  16. True/False: Wool is softer than cotton.
    Answer: True

  17. True/False: Jute is often used to make clothing.
    Answer: False

  18. True/False: Wool is usually dyed before spinning.
    Answer: False

  19. True/False: All fibres are made from natural sources.
    Answer: False

  20. True/False: The process of spinning involves twisting the fibre into threads.
    Answer: True

10 Short Answer Questions

  1. What is weaving?
    Answer: Weaving is the process of interlacing two sets of yarns (lengthwise and crosswise) to form fabric.

  2. What is the source of wool?
    Answer: Wool is obtained from the hair of animals like sheep, goats, and camels.

  3. What is the difference between natural and synthetic fibres?
    Answer: Natural fibres are obtained from plants or animals, while synthetic fibres are man-made using chemicals.

  4. What is jute used for?
    Answer: Jute is used to make products like ropes, bags, and sacks.

  5. What is the first step in the production of wool?
    Answer: The first step is shearing, which is the process of removing fleece from sheep.

  6. What is spinning?
    Answer: Spinning is the process of twisting fibres into yarn.

  7. What are synthetic fibres made of?
    Answer: Synthetic fibres are made from chemical substances, usually derived from petroleum.

  8. What is the main source of cotton?
    Answer: Cotton is obtained from the cotton plant, specifically from the cotton bolls.

  9. Name two uses of silk.
    Answer: Silk is used to make clothing and bedding products like quilts.

  10. How are fibres converted into fabric?
    Answer: Fibres are converted into fabric through spinning (to make yarn) and weaving or knitting (to make fabric).

10 Brief Answer Questions

  1. Explain the process of spinning.
    Answer: Spinning is the process of twisting fibres together to form yarn or thread. This yarn is then used for weaving or knitting.

  2. What is the importance of the loom in fabric production?
    Answer: A loom is a machine used for weaving, where two sets of yarn are interlaced to form fabric.

  3. What are synthetic fibres? Give an example.
    Answer: Synthetic fibres are man-made fibres created from chemical processes. An example is Nylon.

  4. How is wool obtained from sheep?
    Answer: Wool is obtained by shearing the fleece of sheep, which is then cleaned, dyed, and spun into yarn.

  5. What is the significance of the silkworm in the production of silk?
    Answer: The silkworm produces a cocoon, which is unravelled to obtain silk threads that are spun into fabric.

  6. How are natural fibres different from synthetic fibres?
    Answer: Natural fibres are derived from plants and animals, while synthetic fibres are man-made using chemicals.

  7. What is the role of spinning in fabric production?
    Answer: Spinning converts raw fibres into yarn or thread, which is the basic material for making fabrics.

  8. What is a yarn?
    Answer: Yarn is a long strand of twisted fibre used to make fabric through processes like weaving and knitting.

  9. Why is jute important for the environment?
    Answer: Jute is biodegradable, making it an eco-friendly option for products like bags and ropes.

  10. What is the difference between weaving and knitting?
    Answer: Weaving involves interlacing two sets of yarn at right angles, while knitting involves looping yarns together to form fabric.

10 Detailed Answer Questions

  1. Describe the process of making fabric from cotton.
    Answer: Cotton is harvested from the cotton plant, and the cotton bolls are opened to extract the cotton fibres. The fibres are cleaned and spun into yarn. This yarn is then woven or knitted to create fabric.

  2. Explain the role of the silkworm in the production of silk.
    Answer: The silkworm secretes a sticky liquid that solidifies into a long thread to form its cocoon. These silk fibres are unraveled from the cocoon, cleaned, and spun into silk thread, which is used to make fabric.

  3. Discuss the differences between natural and synthetic fibres with examples.
    Answer: Natural fibres come from plants or animals, such as cotton (from plants), wool (from animals), and silk (from silkworms). Synthetic fibres, like Nylon and Polyester, are made from chemicals through a manufacturing process. Natural fibres are biodegradable, whereas synthetic fibres are not.

  4. How are synthetic fibres manufactured?
    Answer: Synthetic fibres are produced by chemically processing petroleum-based products. These chemicals are polymerized to create long chains, which are then spun into fibres, like Nylon or Polyester, which are used to make fabrics.

  5. Describe the process of weaving.
    Answer: Weaving is the technique of interlacing two sets of yarns – the lengthwise yarns (warp) and the crosswise yarns (weft) – at right angles to each other to create fabric.

  6. What are the main uses of wool?
    Answer: Wool is used to make warm clothing like sweaters, shawls, and coats, as well as blankets, carpets, and upholstery.

  7. What steps are involved in converting jute into fabric?
    Answer: Jute is first harvested and dried. The fibres are then extracted from the plant, cleaned, and spun into yarn. The yarn is woven into fabric, which is used to make products like sacks, bags, and ropes.

  8. How does the process of spinning help in fabric production?
    Answer: Spinning turns raw fibres into yarn, which is essential for creating fabric. Without spinning, fibres would remain as loose, unformed strands and wouldn't be suitable for weaving or knitting.

  9. Discuss the environmental benefits of using natural fibres like cotton and jute.
    Answer: Natural fibres are biodegradable, meaning they break down naturally over time, reducing environmental pollution. Cotton and jute are also renewable resources, making them more sustainable compared to synthetic fibres.

  10. What is the significance of using synthetic fibres in modern textiles?
    Answer: Synthetic fibres like Polyester and Nylon are cheaper, more durable, and versatile compared to natural fibres. They are used in a wide range of products like clothing, upholstery, and industrial applications. However, they are not biodegradable, which poses environmental concerns.

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