Question

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29. Of the following materials:
(Cotton, Nylon, Terylene, Wool, PET, Acrylic,Rayon)
(a) Which materials are polyesters?
(b) Which material is a polyamide?
(c) Which material is used as a substitute for wool?
30. (i) State the differences between manures and fertilisers.
(ii) Mahesh uses a cultivator for ploughing, whereas Satish uses a hoe for ploughing. What advantage de
Mahesh have over Satish?
31. (i) Draw a neat labeled diagram of burning candle
(ii) What is ignition temperature?
OR
Describe how coal is formed from dead vegetation.
32. Define asexual reproduction Describe two methods of asexual reproduction in animals.
33. What are seismic zones? Where are the main seismic zones located in our country.
34. What is regular and diffused reflection? Explain with diagram.
OR
What is the "Braille System”? Write a paragraph on “Braille System".​

Answer 1

Answer:

Ans . 29 (a) Terylene (b) Nylon (c) acrylic...