ICSE Class VII Science Solutions

Displaying 5 out of 12 questions & answers.
Q1.

Choose and write the correct answer(MCQs):

  1. The science of raising silkworms so as to obtain silk cocoons is called:
    1. sericulture
    2. pisciculture
    3. poultry
    4. none of these
  2. A beautiful and expensive golden coloured wild silk called:
    1. vacuna
    2. muga
    3. merino
    4. none of these
  3. Wool and silk are:
    1. vitamin
    2. protein
    3. mineral
    4. elastic
  4. The twisting of fibre to make yarn is called:
    1. roving 
    2. carding
    3. weaving
    4. washing 
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Answer:
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  1. (a) sericulture
  2. (b) muga
  3. (b) protein
  4. (a) roving
Q2.

Fill in the blanks:

  1. The cocoons are soaked in _____________ water, then is washed to remove ____________ and _____________ from it.
  2. The silk is fed on _______________ leaves.
  3. The ______________ indicates that a given fabric is made from new and pure wool.
  4. Clothing made from _______________ is warm and light.
  5. The best wool comes from _______________ sheep.
  6. A carding machine has wire toothed _____________.
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Answer:
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  1. hot, sericin, impurities
  2. mulberry
  3. woolmark
  4. merino wool
  5. Merino
  6. drums
Q3.

Write T for true or F for false:

  1. The best wool comes from goat.
  2. A sheep is usually sheared of its coat once in its lifetime.
  3. The cocoon are soaked in fresh water.
  4. Raw silk is boiled in soap to remove its natural gum.
  5. A carding machine has wire-toothed rollers.
  6. silk is natural carbohydrate fibre.
  7. Silk worm feeds on mango leaves.
  8. Wool of Karakul may have 40 crimps per centimetre.
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Answer:
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answer not shown
Q4.

Match the column A with column B:

AB
1. A variety of wild silk having a golden yellow colora. Marino
2. Science of rearing silk worms so as obtain silkb. Muga
3. The name of sheep which produced finest variety of woolc. Sericulture
4. An international trade mark for new and pure woold. Worsted
5. A woollen fabric having a smooth surfacee. Wool mark

 

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Answer:
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  1. (b) Muga
  2. (c) Sericulture
  3. (a) Merino
  4. (e) Wool mark
  5. (d) Worsted
Q5.
What is wool and what are its sources?
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Answer:
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answer not shown
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