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Class 7 Exam  >  Class 7 Tests  >  Test: Synthetic Fibres And Plastics (Easy) - Class 7 MCQ

Test: Synthetic Fibres And Plastics (Easy) - Class 7 MCQ


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15 Questions MCQ Test - Test: Synthetic Fibres And Plastics (Easy)

Test: Synthetic Fibres And Plastics (Easy) for Class 7 2024 is part of Class 7 preparation. The Test: Synthetic Fibres And Plastics (Easy) questions and answers have been prepared according to the Class 7 exam syllabus.The Test: Synthetic Fibres And Plastics (Easy) MCQs are made for Class 7 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Synthetic Fibres And Plastics (Easy) below.
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Test: Synthetic Fibres And Plastics (Easy) - Question 1
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Which of the following materials take the longest to degenerate?

Detailed Solution for Test: Synthetic Fibres And Plastics (Easy) - Question 1
Plastic bags, because they are complex polymers of long-chain hydrocarbons. It is non-biodegradable. Plastic bags do not break down naturally. When we dispose of them in a garbage pile, the air, moisture, climate, or soil cannot break them down naturally to be dissolved with the surrounding land.

However natural waste and products made from nature break down easily when they are disposed of as waste.

Test: Synthetic Fibres And Plastics (Easy) - Question 2
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Assertion

Rayon is a semi-synthetic polymer and is taken as a better choice than cotton fabric.

Reason

Mechanical and aesthetic properties of cellulose can be improved by acetylation.

Detailed Solution for Test: Synthetic Fibres And Plastics (Easy) - Question 2

Both the assertion and the reason are correct statements, and the reason is the correct explanation for the assertion.
Assertion:
Rayon, also known as cellulose acetate, is a semi-synthetic polymer that has superior properties to natural cotton fibre.
Due to this, it is taken as a better choice than cotton fibre. Hence, the assertion is a correct statement.
Reason:
The mechanical and aesthetic properties of cellulose can be improved by acetylation. Hence, Rayon, a product of acetylation of cellulose, has better properties than cotton.
Hence, the reason is a correct statement.
Both the assertion and the reason are correct statements, and the reason is the correct explanation for the assertion.

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Test: Synthetic Fibres And Plastics (Easy) - Question 3
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Polycot is a mixture of:

Detailed Solution for Test: Synthetic Fibres And Plastics (Easy) - Question 3
C, Polycot is a mixture of polyester and cotton. It is prepared in the laboratory. Cotton is obtained from natural resources such as plants and whereas polyester is made in a laboratory from coal. The ratio varies, with cotton and polyester being the most common. blends are also easily found. The blend is designed to afford the advantages of both the cotton and polyester fibres into one fabric.

Test: Synthetic Fibres And Plastics (Easy) - Question 4
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Which of the following substances is bio-degradable?
Detailed Solution for Test: Synthetic Fibres And Plastics (Easy) - Question 4
Biodegradable wastes are such waste materials that are and can be degraded by natural factors like microbes (e.g. bacteria, fungi, and a few more), abiotic elements like temperature, UV, oxygen, etc. Example: kitchen wastes and other natural wastes.

The cloth is a natural polymer made from cellulose. Cotton, silk, wool is biodegradable while plastics (thermoplastic, thermosetting plastics, PVC) are synthetic polymers and are non-biodegradable.

Test: Synthetic Fibres And Plastics (Easy) - Question 5
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A yarn can be split into fine strands of a thread. StateTrue or False.
Detailed Solution for Test: Synthetic Fibres And Plastics (Easy) - Question 5
Yarn itself is a loose thread and they can be split into thin strands.

Test: Synthetic Fibres And Plastics (Easy) - Question 6
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Ropes made of_______are used in cranes and lifts.
Detailed Solution for Test: Synthetic Fibres And Plastics (Easy) - Question 6
Ropes made of nylon are used in elevators and cranes because of its high tensile strength. Nylon is light and elastic and does not lose its strength with time thus it is used in elevators and cranes.

Test: Synthetic Fibres And Plastics (Easy) - Question 7
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__________is not a natural fibre.
Detailed Solution for Test: Synthetic Fibres And Plastics (Easy) - Question 7
Rayon is a manufactured regenerated cellulose fibre. It is made from purified cellulose, primarily from wood pulp, which is chemically converted into a soluble compound.

Test: Synthetic Fibres And Plastics (Easy) - Question 8
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Which resembles in properties with wool?
Detailed Solution for Test: Synthetic Fibres And Plastics (Easy) - Question 8
Acrylic, Orlon, and Acrilan are artificial and man-made fibres that resemble in properties with wool and is cheaper than actual wool and is colored with many dyes and sold in the market, They are made up of polyacrylonitrile and are used in making clothes, sweaters, carpets, and blankets. After discussing we can conclude that Acrylic, Orlon, and Acrilan have properties that resemble wool.

Test: Synthetic Fibres And Plastics (Easy) - Question 9
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The plastics which soften upon being heated but regain all their original properties on cooling are known as?
Detailed Solution for Test: Synthetic Fibres And Plastics (Easy) - Question 9
The plastics which soften upon being heated but remain an original property on cooking are known thermoplastics. Example: Polyethylene, PVC, Acrylic, Nylon, and Teflon

Test: Synthetic Fibres And Plastics (Easy) - Question 10
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The plastic that is used in making uniforms of firemen is
Detailed Solution for Test: Synthetic Fibres And Plastics (Easy) - Question 10
Melamine is a poor conductor of heat and resists fire. Most of the synthetic fibres are poor conductors of heat and electricity. However, melamine is used as a coating on the uniforms of firemen as they are flame resistant.

Test: Synthetic Fibres And Plastics (Easy) - Question 11
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Which plastic is called fireproof plastic?
Detailed Solution for Test: Synthetic Fibres And Plastics (Easy) - Question 11
Melamine is a poor conductor of heat and resists fire. Most of the synthetic fibres are poor conductors of heat and electricity. However, melamine is used as a coating on the uniforms of firemen as they are flame resistant.

Test: Synthetic Fibres And Plastics (Easy) - Question 12
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Shellac secreted by lac insects is:
Detailed Solution for Test: Synthetic Fibres And Plastics (Easy) - Question 12
Shellac is a resin secreted by the female lac bug on trees in the forests of India and Thailand. So a natural resin. Shellac is a natural bioadhesive polymer and is chemically similar to synthetic polymers, and thus can be considered a natural form of plastic. It can be turned into a molding compound when mixed with wood flour and molded under heat and pressure methods, so it can also be classified as thermoplastic. So a natural elastic.

Test: Synthetic Fibres And Plastics (Easy) - Question 13
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Which of the following is known as regenerated fibre?
Detailed Solution for Test: Synthetic Fibres And Plastics (Easy) - Question 13
Rayon is known as a regenerated fiber because it is manufactured from natural resources like cellulose present in wood pulp and short fibres.

Test: Synthetic Fibres And Plastics (Easy) - Question 14
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Which of these fibres is non-biodegradable?
Detailed Solution for Test: Synthetic Fibres And Plastics (Easy) - Question 14
Nylon fiber is non - biodegradable as it is synthetic fibre.

Test: Synthetic Fibres And Plastics (Easy) - Question 15
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Incineration of plastics causes:
Detailed Solution for Test: Synthetic Fibres And Plastics (Easy) - Question 15
Burning plastic creates harmful dioxins and if incinerators are inefficient, these leak into the environment. Modern incinerators are said to have largely solved this problem. But climate change is another consideration.
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