Clothes are the primary need of life. But its significance lies in the fabrics. Fabrics are made from yarns and yarns are made from fibres. Based on the origination, we can classify fibres into two classes- namely plant fibres and animal fibre. Cotton, jute and flax are examples of natural fibres where as wool and silk are examples of animal fibres. Woollen yarn is knitted into sweaters while silk fibres are woven into silk sarees or silk clothes.
Download Class 7 Chemistry Worksheet on Chapter 3 Fibre to Fabric Set 1 PDF
CBSE Class 7 Chemistry Chapter 3 Fibre to Fabric Worksheet – Set 1
Q1. Which of the following does not yield wool?
(a) Yak
(b) Camel
(c ) Goat
(d) None of the above
Q2. Silkworm is a kind of
(a) Larva
(b) Caterpillar
(c ) Pupa
(d) Both (a) and (b)
Q3. Which of the following stage requires a lot of feeding?
(a) Silkworm stage
(b) Cocoon stage
(c ) Egg stage
(d) None of the above
Q4. Which of the following criterion is used to grade wool?
(a) Texture
(b) Length
(c ) Dyeing capacity
(d) All of the above
Q5. What do we feed a silkworm?
(a) Peepal leaves
(b) Blackberry leaves
(c ) Mulberry leaves
(d) All of the above
Q6. Silk is obtained from the _______ of silkworms.
Q7. _______ fibres are rough to touch.
Q8. The thread obtained in the reeling process is known as ___ _____.
Q9. Silk thread is extracted from the cocoons by a process known as ________.
Q10. About _______ silkworms are required to produce one kilogram of raw silk.
Q11. What do you understand by the term shearing?
Q12. What do you understand by the term sericulture?
Q13. Why do caterpillars shed their skin?
Q14. What do you understand by the term silk reeling?
Q15. How will you differentiate between silk and wool?
Q16. How will you differentiate between shearing and scouring?
Q17. Why do we use wool in the winter?
Q18. Why do people of animal protection oppose sericulture?
Q19. Give examples of two diseases associated with working in the sericulture industry.
Q20. What is sericulture? What are the risks of working in the sericulture industry?
Download the PDF to access answers to the Chemistry Worksheet for Class 7 Chemistry Chapter 3 Fibre to Fabric Set -1.
Download PDF
Read Also:
Recommended Videos
The Story of the Silk Worm
