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Test: Synthetic Fibres And Plastics (Medium)


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20 Questions MCQ Test Science Class 8 | Test: Synthetic Fibres And Plastics (Medium)

Test: Synthetic Fibres And Plastics (Medium) for Class 8 2022 is part of Science Class 8 preparation. The Test: Synthetic Fibres And Plastics (Medium) questions and answers have been prepared according to the Class 8 exam syllabus.The Test: Synthetic Fibres And Plastics (Medium) MCQs are made for Class 8 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Synthetic Fibres And Plastics (Medium) below.
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Test: Synthetic Fibres And Plastics (Medium) - Question 1

Like synthetic fibres, plastic is also a:

Detailed Solution for Test: Synthetic Fibres And Plastics (Medium) - Question 1 Synthetic fibres are made up of raw materials such as petroleum, based on chemicals and petrochemicals, which are polymerized into a long, linear chemical with different chemical compounds.

Plastics are organic polymers of high molecular mass and contain other substances, called monomers. Therefore, we can say that both synthetic fibres and plastics are made by polymerization of their monomer units.

Test: Synthetic Fibres And Plastics (Medium) - Question 2

The use of plastic material polyesters is in:

Detailed Solution for Test: Synthetic Fibres And Plastics (Medium) - Question 2 Plastic material polyester used in Recording tapes.

Test: Synthetic Fibres And Plastics (Medium) - Question 3

Which type of cloth dries faster in the rainy season?

Detailed Solution for Test: Synthetic Fibres And Plastics (Medium) - Question 3 Synthetic fibres like polyesters dry up quickly.

Test: Synthetic Fibres And Plastics (Medium) - Question 4

Rayon blended in wool will result in

Detailed Solution for Test: Synthetic Fibres And Plastics (Medium) - Question 4 Rayon is a synthetic fibre that is breathable and drapes well. A rayon/cotton blend is common. Rayon lends a silky feel and appearance to the blend but like cotton, it's prone to creases. Still, rayon wrinkles less than cotton which adds benefit to the fabric blend.

Test: Synthetic Fibres And Plastics (Medium) - Question 5

Define Plasticity:

Detailed Solution for Test: Synthetic Fibres And Plastics (Medium) - Question 5 Plasticity, the ability of certain solids to flow or to change shape permanently when subjected to stresses of intermediate magnitude between those producing temporary deformation, or elastic behavior, and those causing failure of the material, or rupture.

Test: Synthetic Fibres And Plastics (Medium) - Question 6

Which of the following statements is true about thermosetting plastic?

Detailed Solution for Test: Synthetic Fibres And Plastics (Medium) - Question 6 Thermosetting plastics contain polymers that cross-link together during the curing process to form an irreversible chemical bond. It can't be recycled. The cross-linking process eliminates the risk of the product remelting when the heat is applied, making thermosetting ideal for high-heat applications such as electronics and appliances.

Test: Synthetic Fibres And Plastics (Medium) - Question 7

Animal fibres are made of:

Detailed Solution for Test: Synthetic Fibres And Plastics (Medium) - Question 7 Protein, animal fibers are natural fibers that consist largely of particular proteins. Instances are silk, hair/fur (including wool) and feathers. The animal fibres used most commonly both in the manufacturing world as well as by the hand spinners are wool from domestic sheep and silk.

Test: Synthetic Fibres And Plastics (Medium) - Question 8

Which of the following items cannot be recycled?

Detailed Solution for Test: Synthetic Fibres And Plastics (Medium) - Question 8 Plastic containers are relatively dense and compact which enables them to be easily sorted mechanically, into the different types of plastics. Plastic film and bags are not easily mechanically sorted making them very costly to sort. Also, recycling such plastic is an expensive process.

Test: Synthetic Fibres And Plastics (Medium) - Question 9

Electrical wires have a coating of insulating material. The material generally used for insulation is:

Detailed Solution for Test: Synthetic Fibres And Plastics (Medium) - Question 9

PVC is an insulator and prevents electricity to be conducted outside the wire so that electric shock can be prevented.

Test: Synthetic Fibres And Plastics (Medium) - Question 10

Containers that are lightweight, lower price, good strength, and easy to handle is made up of:

Detailed Solution for Test: Synthetic Fibres And Plastics (Medium) - Question 10 Plastic has lightweight, lower price, good strength, and easy to handle. Therefore, the container is made from plastic.

Test: Synthetic Fibres And Plastics (Medium) - Question 11

Which of the following statements is incorrect?

Detailed Solution for Test: Synthetic Fibres And Plastics (Medium) - Question 11 Nylon: A synthetic material, nylon isn't anything but a cool fabric to weather in the summer as it's specifically designed to repel water.

Test: Synthetic Fibres And Plastics (Medium) - Question 12

The general formula of alkynes is ...............

Detailed Solution for Test: Synthetic Fibres And Plastics (Medium) - Question 12 The general formula for alkynes is CnH2n-2. Acetylene is the simplest alkyne with the formula as C2H2.

Test: Synthetic Fibres And Plastics (Medium) - Question 13

Rayon or artificial silk is obtained from:

Detailed Solution for Test: Synthetic Fibres And Plastics (Medium) - Question 13 Although rayon is obtained from a natural source of wood pulp, yet it is a man-made fiber.

Test: Synthetic Fibres And Plastics (Medium) - Question 14

We come to a conclusion, that plastics are bad conductors of electricity from the followings:

Detailed Solution for Test: Synthetic Fibres And Plastics (Medium) - Question 14 Plastic does not allow electricity to pass through it thus is called bad conductors of electricity and can be used as insulators.

Test: Synthetic Fibres And Plastics (Medium) - Question 15

Nylon is obtained by:

Detailed Solution for Test: Synthetic Fibres And Plastics (Medium) - Question 15 Nylon was first commercially synthesized fibre. The production of nylon was started almost simultaneously in New York and London, thus it got its name (NY for New York and Lon for London) as nylon. Nylon is synthesized from coal, water and air. Fibre of nylon is very strong and it also resembles silk.

Test: Synthetic Fibres And Plastics (Medium) - Question 16

Name the fibres which are made by human beings.

Detailed Solution for Test: Synthetic Fibres And Plastics (Medium) - Question 16 Synthetic fibres are made by human beings. Example – Rayon, nylon, etc.

Test: Synthetic Fibres And Plastics (Medium) - Question 17

When a small unit combines to form a large single unit then it is called __________.

Detailed Solution for Test: Synthetic Fibres And Plastics (Medium) - Question 17 A synthetic fibre is also a chain of small units joined together. Each small unit is actually a chemical substance. Many such small units combine to form a large single unit called a polymer. Example: Nylon, polythene, Teflon, etc.

Test: Synthetic Fibres And Plastics (Medium) - Question 18

Synthetic fibres are also known as ____________.

Detailed Solution for Test: Synthetic Fibres And Plastics (Medium) - Question 18

Synthetic fibres are also called man-made or artificial fibres.

Test: Synthetic Fibres And Plastics (Medium) - Question 19

Name the fibre, having properties similar to that of silk.

Detailed Solution for Test: Synthetic Fibres And Plastics (Medium) - Question 19 Rayon has properties similar to silk and is therefore called artificial or synthetic fibre.

Test: Synthetic Fibres And Plastics (Medium) - Question 20

___________ is used for making parachutes and ropes for rock climbing.

Detailed Solution for Test: Synthetic Fibres And Plastics (Medium) - Question 20 Nylon fibre is used in making ropes for rock climbing and parachutes because it is a very strong fibre.

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