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Ncert solution of class 7 ch 7 .weather climate and adaptation of animals to climate

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Ncert solution class 8 science ch 3 Synthetic Fibres and Plastics.

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Ncert solution class 8 science ch 3 Synthetic Fibres and Plastics. book questions 1 to 5. Q 1.  Explain why some fibres are called synthetic. Answer :  There are some fibers that are made by humans using chemicals. These are called synthetic fibers. These are made up of small units that join together to create long chains. Examples of synthetic fiber are rayon, nylon, polyester, acrylic, etc. Q 2.  Mark the correct answer. rayon is different from synthetic fibres because: Answer :   it is obtained from wood pulp. Q 3. Fill in the blanks:- Answer : (a)  artificial  and  man made (b)  petrochemicals (c)  polymer Q 4.Give example which indicate that nylon fibres are very strong. Answer :  Nylon fibers are very strong. It is used to make ropes to climb the rocks and To create a parachute. Their use shows that the nylon fiber has high tensile strength. Q 5. Explain why plastics container are favoured for storing food. Answer ...
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