CBSE  /  Class 7  /  Science  /  Heat

  • 1. 
    Which one of the following is not a breed of sheep?

  • Murrah
  • Marwari
  • Lohi
  • Nali

  • 2. 
    What is the scientific name of mulberry tree?

  • Magnifera indica
  • Morus alba
  • Desmodium girence
  • None of these

  • 3. 
    Silk is derived from

  • cocoon
  • pupa
  • egg
  • moth

  • 4. 
    Selective breeding is a process of

  • selecting the offspring with desired properties.
  • selecting the parents with desired properties.
  • selecting an area for breeding.
  • selecting fine hair for good quality wool.

  • 5. 
    The general process that takes place at a sheep shearing shed is:

  • removal of fleece.
  • separating hair of different textures.
  • washing of sheep fibre to remove grease.
  • rolling of sheep fibre into yam.

  • 6. 
    The rearing of silkworms for obtaining silk is called:

  • cocoon
  • silk
  • sericulture
  • silviculture

  • 7. 
    Which of the following is not a type of silk?

  • Mulberry silk
  • Tassar silk
  • Mooga silk
  • Moth silk

  • 8. 
    Paheli wanted to buy a gift made of animal fibre obtained without killing the animal. Which of the following would be the right gift for her to buy?

  • Woollen shawl
  • Silk scarf
  • Animal fur cap
  • Leather jacket

  • 9. 
    Silk fibre is obtained from:

  • fleece of sheep
  • cotton ball
  • cocoon
  • shiny jute stalk

  • 10. 
    Wool fibre cannot be obtained from which of the following?

  • Goat
  • Llama
  • Alpaca
  • Moth
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