Page 1 - H.A -2 -PRACTICE WORKSHEET

SAI International School
Class – VII

Subject – Chemistry
Topic – Animal Fibres
Sub-Topic – Wool, Silk& Health Hazards

PRACTICE WORKSHEET- 3
General Instructions:

(i) All MCQ based questions, you must choose only one option
(ii) (ii) For Assertion & Reasoning question choose the option appropriate.

QUESTIONS Marks SKIL
Q. No.
1 Which is the starting point of the textile chain? 1 R

(a) Fabric b) Fibre c) Silk d) wool
2 `Sorting of wool according to the length, colour and 1 K
texture is called
a) Shearing b) Sheep farming c) Scouring d)
Grading
3 The quality of wool is judged by 1 K
a) wool length b) diameter c) Elasticity d) All

of these
In the following questions 4 to 6, a statements of
Assertion (A) is followed by a statement of reason
Mark the correct choice a) both assertion and
reason R are true
And reason (R) is the correct explanation of
assertion(A)
b) Both assertion (A) and reason are true but
reason is not correct explanation of assertion (A).
c) Assertion (A) is true but reason is false.
d) Assertion (A) is false and reason is true.
e) Both assertion (A) and reason are false.

4. Assertion: Rayon is called artificial silk 1 K&A
Reason: It is obtained from wood pulp.

5. Assertion: Silk fabric can be used in all 1 K&A
weather
Reason: It is cool to wear in summer and
warm to wear in winter.
6. Assertion: Cotton dress is worn while 1 K&A
cooking.
Reason: Cotton fibres do not catch fire
easily.
7. Explain how fibre is the starting point of the textile 3 K&A
chain?

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