CBSE Questions for Class 7 Chemistry Fibre To Fabric Quiz 4 - MCQExams.com

Read the given paragraph carefully.
The female silk  (i)  lays eggs. When an egg hatches, a tiny caterpillar called silkworm or  (ii)  crawls out. It feeds on leaves and grows. When it is ready to enter the next stage in its life cycle, it first weaves a net to hold itself. It then secretes a fibre made of  (iii)  which hardens on exposure to air. This is the silk fibre. It covers itself completely with this fibre, to form a  (iv) . At this stage, the larva is called a  (v) , which grows and changes inside the covering and, a few weeks later comes out as an adult.
Select the correct sequence of words to complete the above paragraph.
  • (i)-Moth, (ii)-Larva, (iii)-Protein, (iv)-Pupa, (v)-Cocoon
  • (i)-Larva, (ii)-Moth (iii)-Carbohydrate (iv)-Pupa (v)-Cocoon
  • (i)-Moth, (ii)-Larva, (iii)-Protein, (iv)-Cocoon, (v)-Pupa
  • (i)-Moth, (ii)-Larva, (iii)-Fat, (iv)-Cocoon, (v)-Pupa
Select the correct statement from the following.
  • Polyester is obtained from plant stem
  • Jute is the outer covering of coconut
  • Spinning is a process of making fibers
  • The yarn is made from fibers
Which set of substances is not used for making fibres ?
  • Silk, chemicals
  • Yak hair, camel hair
  • Husk, bones
  • Flax, wool
A Tibetan antelope yields a kind of wool which is considered to be the world's finest and warmest wool, with fibres one-fifth the thickness of a human hair. This wool is also called the 'king of wools'. Name the brand of wool and the antelope from which it is obtained?
  • Shahtoosh, Chiru
  • Mohair, Angora
  • Vicuna, Iama
  • Grease wool, Chinkara
The major ingredient of leather is:
  • Carbohydrate
  • Polymer
  • Collagen
  • Nucleic acid
Silk fibre is obtained from
  • Fleece of sheep
  • Cotton ball
  • Cocoon
  • Shiny jute stalk
Which of the following is not a type of silk?
  • Mulberry silk
  • Tassar silk
  • Mooga silk
  • Moth silk
Selective breeding is a process of
  • Selecting the off springs with desired properties.
  • Selecting the parents with desired properties.
  • Selecting an area for breeding.
  • Selecting fine hair for good quality wool.
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
Yarn is made from fibres.
  • True
  • False
Silk fiber is obtained from the stem of a plant.
  • True
  • False
The fibres obtained from animals are made up of _________.
  • proteins
  • carbohydrates
  • cellulose
  • vitamins
Where was silk first produced in $$3000 \ B.C$$?
  • India
  • America
  • Australia
  • China
Match the column I with column II and select the correct option from the codes given below.
Column I                           Column II
(Material)                     (Smell on burning)
(a) Silk                        (i) Burning plastic
(b)Wool                      (ii) Charred meat
(c) Nylon                    (iii) Burning hair
  • (a) - (i), (b) - (ii), (c) - (iii)
  • (a) - (iii), (b) - (i), (c) - (ii)
  • (a) - (iii), (b) - (ii), (c) - (i)
  • (a) - (ii), (b) - (iii), (c) - (i)
The example of animal fibre is: 
  • cotton
  • nylon
  • wool
  • jute
Silk is obtained from:
  • sheep
  • goat
  • wool
  • silk worm
Which of the following is/are correct regarding the processing of silk?
  • Cocoons are exposed to heat to separate out the silk fibres from them. This process is called reeling the silk.
  • Special machines unwind the silk fibres from the cocoons.
  • Silk fibres are spun into silk threads, and then weavers weave them into silk cloth.
  • All of the above
Silkworm secrete fibre made up of:
  • fat
  • cellulose
  • protein
  • nylon
The given table enlists the type of silk (P) and plants on the leaves of which related silkworm feeds (Q). Select the option which completes the table.
PQ
MulberryMulberry
MegaX
EriY
TussarZ
  • X - Som, Y- Castor, Z - Arjun
  • X - Arjun, Y - Castor, Z - Sal
  • X - Sal, Y - Saja, Z - Arjun
  • X - Castor, Y - Sal, Z - Som
Which type of bags are used to keep silk cloths?
  • Linen
  • Cotton
  • Paper
  • Plastic
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