All Courses
Get the App Signup / Login
Sign in Open App
Class 7 Exam  >  Class 7 Tests  >  Olympiad Test: Synthetic Fibres And Plastics - Class 7 MCQ

Olympiad Test: Synthetic Fibres And Plastics - Class 7 MCQ


Test Description

20 Questions MCQ Test - Olympiad Test: Synthetic Fibres And Plastics

Olympiad Test: Synthetic Fibres And Plastics for Class 7 2024 is part of Class 7 preparation. The Olympiad Test: Synthetic Fibres And Plastics questions and answers have been prepared according to the Class 7 exam syllabus.The Olympiad Test: Synthetic Fibres And Plastics MCQs are made for Class 7 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Olympiad Test: Synthetic Fibres And Plastics below.
Solutions of Olympiad Test: Synthetic Fibres And Plastics questions in English are available as part of our course for Class 7 & Olympiad Test: Synthetic Fibres And Plastics solutions in Hindi for Class 7 course. Download more important topics, notes, lectures and mock test series for Class 7 Exam by signing up for free. Attempt Olympiad Test: Synthetic Fibres And Plastics | 20 questions in 20 minutes | Mock test for Class 7 preparation | Free important questions MCQ to study for Class 7 Exam | Download free PDF with solutions
Olympiad Test: Synthetic Fibres And Plastics - Question 1
Save

Coir fiber is obtained from

Detailed Solution for Olympiad Test: Synthetic Fibres And Plastics - Question 1
COIR is a versatile natural fibre extracted from mesocarp tissue or husk of the coconut fruit. The husk contains 20% to 30% fibre of varying lengths. After grinding the husk, the long fibres are removed and used for various industrial purposes, such as rope and mat making.

Olympiad Test: Synthetic Fibres And Plastics - Question 2
Save

The world's first fully synthetic plastic was:

Detailed Solution for Olympiad Test: Synthetic Fibres And Plastics - Question 2
The world's first fully synthetic plastic was bakelite, invented in New York in 1907 by Leo Baekeland who coined the term 'plastics'. Bakelite is made from carbolic acid (phenol) and formaldehyde and is referred to as a phenolic resin. Bakelite was the first thermosetting plastic.

1 Crore+ students have signed up on EduRev. Have you? Download the App
Olympiad Test: Synthetic Fibres And Plastics - Question 3
Save

Figure(ii) shows an arrangement of units that make up plastics. Name the arrangement:

Detailed Solution for Olympiad Test: Synthetic Fibres And Plastics - Question 3
Cross-linked polymers, on the other hand, are those in which chemical bonds are formed between adjacent polymer chains, so that a network structure forms.

Olympiad Test: Synthetic Fibres And Plastics - Question 4
Save

Which of the following are natural fibres?
Detailed Solution for Olympiad Test: Synthetic Fibres And Plastics - Question 4
Natural fibres can be classified according to their origin. The vegetable, or cellulose-based, the class includes such important fibres as cotton, flax, and jute. The animal, or protein-base, fibres include wool, mohair, and silk. An important fibre in the mineral class is asbestos.

Olympiad Test: Synthetic Fibres And Plastics - Question 5
Save

__________is not a natural fiber.
Detailed Solution for Olympiad Test: Synthetic Fibres And Plastics - Question 5
Rayon is a regenerated cellulose fiber that is made from natural sources of cellulose, such as wood and related agricultural products. It has the same molecular structure as cellulose. Viscose can mean A viscous solution of cellulose. A synonym of rayon.

Olympiad Test: Synthetic Fibres And Plastics - Question 6
Save

_________ is the first fully synthetic fibre.
Detailed Solution for Olympiad Test: Synthetic Fibres And Plastics - Question 6
Nylon was the first fully synthetic fibre made in 1931, without using any natural raw material. It was prepared from chemicals. Nylon fibres are strong, lustrous, elastic, and used for making stockings, car belts, parachutes, ropes, etc.

Olympiad Test: Synthetic Fibres And Plastics - Question 7
Save

A polymer is a large molecule composed of many repeated units. What is a polyester composed of?
Detailed Solution for Olympiad Test: Synthetic Fibres And Plastics - Question 7
Polyester (Poly+ester) is a category of polymers, made up of the repeating units of a type of chemical called an ester. Polyester fibres are strong, resistant to stretching and shrinking. They dry quickly, are wrinkle-resistant and can be easily washed.

Olympiad Test: Synthetic Fibres And Plastics - Question 8
Save

Which of the following material is a mixture of two fibres?
Detailed Solution for Olympiad Test: Synthetic Fibres And Plastics - Question 8
Polywool is a blend of polyester and wool. The blend is designed to afford the advantages of both the wool and polyester fibres in one fabric, such as wrinkle resistance, increased absorbancy, increased strength, etc.

Olympiad Test: Synthetic Fibres And Plastics - Question 9
Save

Which of the following fibres is used for making parachutes?
Detailed Solution for Olympiad Test: Synthetic Fibres And Plastics - Question 9
Nylon threads are strong, elastic, and lightweight. A nylon rope is actually stronger than a steel wire. Hence, it is preferred for making parachutes. Harness straps, suspension lines, tents, sleeping bags, sails, rope, tennis strings, fishing poles, and lines, etc. are also made from nylon fibers because of their strength.

Olympiad Test: Synthetic Fibres And Plastics - Question 10
Save

One of the advantages of nylon over rayon is that nylon:
Detailed Solution for Olympiad Test: Synthetic Fibres And Plastics - Question 10
High elasticity and no wrinkling are the major advantages of nylon over rayon. Hence, though both are suitable for the textile industry, nylon is more popular in making dresses and uniforms than rayon.

Olympiad Test: Synthetic Fibres And Plastics - Question 11
Save

Identify the type of plastic that can best be used to make electrical switches.
Detailed Solution for Olympiad Test: Synthetic Fibres And Plastics - Question 11
Bakelite is a thermosetting plastic, which means it retains its shape even at high temperatures. Whereas, the others mentioned are thermoplastics that can be moulded on heating. Also, bakelite is a poor conductor of electricity, hence, it protects us from getting electric shocks. This is the reason, bakelite is used for making electrical switches, handles of various utensils, etc.

Olympiad Test: Synthetic Fibres And Plastics - Question 12
Save

Modern non-stick cookware and the flat end of an electric iron has a coating of a polymer. Identify the name of the polymer.
Detailed Solution for Olympiad Test: Synthetic Fibres And Plastics - Question 12
A non-stick surface can reduce the ability of other materials to stick on it. These surfaces are coated with a synthetic polymer called teflon. Non-stick cookware and the flat end of an electric iron are coated with teflon.

Olympiad Test: Synthetic Fibres And Plastics - Question 13
Save

Which of the following is a natural fibre obtained from plants?
Detailed Solution for Olympiad Test: Synthetic Fibres And Plastics - Question 13
Cotton is a natural fiber which is obtained from cotton plants. These are the epidermal hairs on the seeds of the crop plants. The fiber is composed of the natural cellulosic material which is used for the production of the cotton ropes from fibres and clothes.

Olympiad Test: Synthetic Fibres And Plastics - Question 14
Save

Which one of the following is thermosetting plastic?
Detailed Solution for Olympiad Test: Synthetic Fibres And Plastics - Question 14
Thermosetting plastics are those plastics which once molded, cannot be softened by heating. Two examples are

i) Bakelite: Used for making electrical switches, handles of various utensils.

ii) Melamine: Used for making floor tiles, kitchenware, and fabrics that can resist heat.

Olympiad Test: Synthetic Fibres And Plastics - Question 15
Save

Terylene is a popular form of
Detailed Solution for Olympiad Test: Synthetic Fibres And Plastics - Question 15
Terylene fabric is a synthetic polyester fibre based on terephthalic acid. It is characterized by weightlessness and crease resistance. Terylene is mostly used for clothing, ropes, sheets, sails, and many others. The name 'terylene fabric' may also refer to any large class of synthetic fabric.

Olympiad Test: Synthetic Fibres And Plastics - Question 16
Save

Petrochemicals are
Detailed Solution for Olympiad Test: Synthetic Fibres And Plastics - Question 16
Petrochemicals are materials obtained from the refining of petroleum. These petrochemicals are used as raw material for manufacturing synthetic fibres.

Olympiad Test: Synthetic Fibres And Plastics - Question 17
Save

Pickles are stored in plastic bottles mainly because they are:
Detailed Solution for Olympiad Test: Synthetic Fibres And Plastics - Question 17
Pickles have an acid (vinegar) in them. Plastics do not react with the chemicals present in the pickle and do not corrode easily. Hence, it is safe to keep pickles in plastic or glass containers to avoid reaction between the acid and the container.

Olympiad Test: Synthetic Fibres And Plastics - Question 18
Save

Polyethylene terephthalate belongs to which class of synthetic polymer?
Detailed Solution for Olympiad Test: Synthetic Fibres And Plastics - Question 18
Polyethylene terephthalate commonly abbreviated PET or PETE is a member of the polyester family of polymers. Polyester is a category of polymers, in which ester is the repeating unit.

Olympiad Test: Synthetic Fibres And Plastics - Question 19
Save

Which of the following is non-biodegradable?
Detailed Solution for Olympiad Test: Synthetic Fibres And Plastics - Question 19
The plastics are the non-biodegradable wastes because they are synthetic polymers which cannot be acted upon by the microbes. They cannot be degraded by the decomposition activity of the bacteria and fungi. The cotton, paper and leftover food are degradable.

Olympiad Test: Synthetic Fibres And Plastics - Question 20
Save

Which term is used for polymers made up of a large number of glucose units?
Detailed Solution for Olympiad Test: Synthetic Fibres And Plastics - Question 20
Cellulose fibers can be obtained from the bark, wood, or leaves of plants, or from plant-based material. Cotton is a polymer of cellulose. It is made up of a large number of glucose units.

Information about Olympiad Test: Synthetic Fibres And Plastics Page
In this test you can find the Exam questions for Olympiad Test: Synthetic Fibres And Plastics solved & explained in the simplest way possible. Besides giving Questions and answers for Olympiad Test: Synthetic Fibres And Plastics , EduRev gives you an ample number of Online tests for practice

Top Courses for Class 7

Download as PDF

Top Courses for Class 7

Important Questions for Olympiad Test: Synthetic Fibres And Plastics

Find all the important questions for Olympiad Test: Synthetic Fibres And Plastics at EduRev.Get fully prepared for Olympiad Test: Synthetic Fibres And Plastics with EduRev's comprehensive question bank and test resources. Our platform offers a diverse range of question papers covering various topics within the Olympiad Test: Synthetic Fibres And Plastics syllabus. Whether you need to review specific subjects or assess your overall readiness, EduRev has you covered. The questions are designed to challenge you and help you gain confidence in tackling the actual exam. Maximize your chances of success by utilizing EduRev's extensive collection of Olympiad Test: Synthetic Fibres And Plastics resources.

Olympiad Test: Synthetic Fibres And Plastics MCQs with Answers

Prepare for the Olympiad Test: Synthetic Fibres And Plastics within the Class 7 exam with comprehensive MCQs and answers at EduRev. Our platform offers a wide range of practice papers, question papers, and mock tests to familiarize you with the exam pattern and syllabus. Access the best books, study materials, and notes curated by toppers to enhance your preparation. Stay updated with the exam date and receive expert preparation tips and paper analysis. Visit EduRev's official website today and access a wealth of videos and coaching resources to excel in your exam.

Online Tests for Olympiad Test: Synthetic Fibres And Plastics

Practice with a wide array of question papers that follow the exam pattern and syllabus. Our platform offers a user-friendly interface, allowing you to track your progress and identify areas for improvement. Access detailed solutions and explanations for each test to enhance your understanding of concepts. With EduRev's Online Tests, you can build confidence, boost your performance, and ace Olympiad Test: Synthetic Fibres And Plastics with ease. Join thousands of successful students who have benefited from our trusted online resources.
© EduRev
Education Revolution
Follow Us
Signup to see your scores go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup