Page 31 - Science Class 07

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A. Tick (3) the correct op on.
1. This is the raw materials which we use to make thread and then yarn.
(a) Fibre (b) Silk
(c) Wool (d) Co on
2. Which country first developed the technique of making tex le out of silk?
(a) India (b) England

(c) China (d) France
3. Which of the following is an ar ficial fibre?
(a) Co on (b) Silk
(c) Linen (d) Nylon

4. In this process, the sheared wool is washed properly using detergent and chemicals to
make it clean, so and germ free.
(a) Cleaning (b) Carding
(c) Shearing (d) All of these
5. Which state of India produces fine quality of wool?

(a) Jammu & Kashmir (b) Karantaka
(c) Assam (d) Tamil Nadu
6. Removing animal hair from its body for commercial purpose is called:
(a) rearing (b) shearing

(c) weaving (d) none of these
B. Fill in the blanks.
1. _______________ are the raw materials which we use to make thread and then yarn.

2. Silk is an important and _______________ fibre.
3. Sericulture is widely prac sed in _______________ and _______________ .
4. Each cocoon may contain up to _______________ of silk filament.
5. _______________ cloth has a smooth surface with minimum fuzziness.

C. Write True or False.
1. Clothes, food and shelter are some of the basic important needs of
mankind.
2. Throwing is a term used when the raw silk is twisted into a strand for
weaving purposes.
3. To remove silk from the cocoons, they are put into hot water.

4. A er the fleece is removed, it is examined for quality.
5. Woollen cloth can also be used for decora ons and occasionally used as
a high-end wall covering.

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