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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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NCERT solution class 7 science ch 5 acids bases and salts.

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ncert sulution class 7 ch 5. Here solution of science book of class 7 ch 5 .detailed solutions of ncert book of class 7. questions 1 to 5. Q 1 . State the differences between acids and bases. Answer : Acid:- (i) these are sour to taste. (ii) acid turn blue litmus red. (iii) acid do not change colour red litmus paper. Bases:-(I) these are bitter to taste. (ii) bases turn red litmus blue. (iii) bases do not change colour blue litmus paper. Q 2 . ammonia isfound in many household product,such as window cleaner. It turn red litmus blue. What is its nature? Answer : Ammonia is fundamental in nature because it turns the colors of red litmus paper into blue. Q 3 . Name the sources from which litmus solution is obtained.what is the use of this solution? Answer : Litmus solution is obtained from Lifes. To get the solution from the solution, the natural dye extracted in distilled water is dissolved in distilled water. It is used as an indicator to differentiate between acids and bases. ...
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