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Get complete NCERT Solutions for 8 Science 3. Synthetic Fibres And Plastics with detailed explanations. Easy-to-understand answers to help students study effectively and score better.
Preparing for exams becomes easier with Additional Questions With Solutions. Whether you are studying for board exams or mid-term exams, 8 Science Chapter 3. Synthetic Fibres And Plastics solutions provide quick revising points, well-structured answers, and additional practice material to help you score better.
ncert_solutionsQ1: Name the sources of fibres, by which are fabrics made?
Ans: Natural fibres and artificial fibres.
Q2: Name the some natural fibres.
Ans: (i) Cotton (ii) wool (iii) silk
Q3: Name some artificial or synthetic fibres.
Ans: (i) Rayon (ii) Nylon (iii) polyester and (iv) Acrylic
Q4: What are synthetic fibres?
Ans: The fibres which are made by the human beings is called synthetic fibres. As Rayon, Nylon, polyester and Acrylic
Q5: What is polymer?
Ans: The small units of fibres which is actually a chemical substance, such many small units combine to form a large single units is called a polymer. Ex. Cellulose, Nylon, polyester etc.
Q6: Name a natural polymer.
Ans: Cellulose.
Q7: Write the property of Rayon.
Ans: Rayon is the man-made fibre which is obtained by chemical treatment of wood pulp.
Properties:
(i) It is cheaper than silk.
(ii) It can be woven like silk fibre.
(iii) It can also be dyed in a wide variety of colours.
Q8: Write the three property of Nylon.
Ans: Nylon is also man-made fibre. It was prepared from coal, water, and air.
Properties;
(i) It is strong, elastic and light.
(ii) It is lustrous and easy to wash.
Q8: Write the use of nylon?
Ans: Nylon is used for making parachutes and ropes for rock climbing. A nylon thread is an actually stronger than a steel wire. It is also used for making cloth.
Q9: Name some synthetics fibers which are used for wearing.
Ans: Polyester and Terylene.
Q10: What is PET and write its uses?
Ans: PET is a very familiar form of polyester. It is used for making bottles, utensils, films, wires and many other useful products.
Q11: What is acrylic?
Ans: The wool which are actually not made from natural wool. These are prepared from another type of synthetic fibre called acrylic.
Q12: What are thermoplastics?
Ans: Such plastic which gets deformed easily on heating and can be bent easily are known as thermoplastics.
Q13: What are thermosetting plastics?
Ans: Some plastics which when moulded once, cannot be softened by heating. These are called thermosetting plastics.
Q14: Give examples to show that plastics are noncorrosive in nature.
Ans: The plastic is noncorrosive in nature because of it doesn’t react to air and water.
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