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Olympiad (Class 7) Fibre to fabric — practice questions — page 2

Explore 52 free Fibre to fabric questions in Olympiad (Class 7) Science. Open each question or exercise to read its content, reference answers and available explanation.

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Fibre to fabric questions and exercises with answers

Showing questions 31–52 of 52.

Why are cocoons dipped in hot water before the moth emerges?Read the answer and worked solution →Winding silk filaments from cocoons onto a reel is called what?Read the answer and worked solution →The silk thread at the stage after it is first reeled from cocoons is called what?Read the answer and worked solution →How many eggs may a female silk moth lay?Read the answer and worked solution →While spinning, the silkworm swings its head in the pattern of which numeral?Read the answer and worked solution →A silkworm makes its silk from secretions of which body part?Read the answer and worked solution →After how many moults does a silkworm climb a twig and spin its cocoon?Read the answer and worked solution →The silk filament in one cocoon is about 1,000 yards long. About how many metres is this?Read the answer and worked solution →Which two countries are the largest producers of silk?Read the answer and worked solution →Silk is called Pattu in which part of India?Read the answer and worked solution →Muga, Eri and Pat silks are produced in which Indian state?Read the answer and worked solution →Which silk from Assam is known as the golden silk?Read the answer and worked solution →Tussar silk comes from cocoons of silkworms found where?Read the answer and worked solution →Why is wild silk usually less uniform than farmed silk?Read the answer and worked solution →In which country is silk believed to have first been produced?Read the answer and worked solution →The trade route that carried silk from China westward is named what?Read the answer and worked solution →Peace silk, also called ahimsa silk, is made by letting what happen before boiling?Read the answer and worked solution →Silk is among the strongest natural fibres but loses up to how much strength when wet?Read the answer and worked solution →A silk scarf clings to your clothes after rubbing because silk is what?Read the answer and worked solution →Which household substance will destroy silk fabric?Read the answer and worked solution →A shirt gets yellowed by sweat. Which fibre is yellowed by perspiration?Read the answer and worked solution →If 104 kg of mulberry leaves yield 1 kg of silk, how many kg of leaves are eaten for 3 kg of silk?Read the answer and worked solution →

Worked practice questions

Why are cocoons dipped in hot water before the moth emerges?

  1. To change silk into wool
  2. To make the thread shorter
  3. To keep one unbroken thread
  4. To make the moth fly out
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Correct answer: C. To keep one unbroken thread

If the moth emerged it would cut the cocoon; hot water keeps it intact so one continuous thread can be unwound.

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Winding silk filaments from cocoons onto a reel is called what?

  1. Sorting
  2. Carding
  3. Shearing
  4. Reeling
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Correct answer: D. Reeling

Reeling means unwinding the filament from the cocoon and winding it onto a reel.

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The silk thread at the stage after it is first reeled from cocoons is called what?

  1. Greasy wool
  2. Raw silk
  3. Burr fibre
  4. Ahimsa silk
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Correct answer: B. Raw silk

The reeled filament that has not been finished is known as raw silk.

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