7. b) PVC. OR Give reasons for – cooking pans have plastic handles. So it is easier to handle the utensil while cooking. Saucepan handles are made of thermosetting plastic like Bakelite because it is a poor conductor of heat. Because of this property it is used for making electric plugs, switches, plug boards, etc. Short answer - cheap, easy to manufacture and meets the product demands. Answer:Thermosetting plastic is fire-resistant and can withstand very high temperature. Due to this, saucepan handles are made of thermosetting plastic. Such handles do not heat up during cooking. Electric plugs/switches/plug boards Answer:Thermosetting plastic is bad conductor of electricity and heat. (b) Thermosetting plastics such as bakelite are poor conductors of heat and electricity. Answer Thermosetting plastics that cannot be softened again by heating once they are moulded. It has more resistance to heat than thermoplastics. (a) Bakelite is used for making electrical switches, handles of various utensils etc. Rayon is different from synthetic fibres because: It has a silk like appearance. Explain why plastic containers are favoured for storing food. Explain the difference between thermoplastic and thermosetting plastics. 34. Explain why the following are made of thermosetting plastics. Q7. b) Thermosetting plastics are used in electric plugs/switches/plug boards as they are bad conductors of electricity. Thermosetting plastics are used for making electrical … are made up of thermosetting plastics? What is a Thermoset. Automotive, aerospace, construction, medical, military, agriculture, and corrosion control are all such industries that utilize parts made with thermoset plastic. Concept insight: Thermosetting plastics once shaped cannot be remolded again and again. However, thermoset plastics are brittle and tend to char and burn if heat is applied for a prolonged state. Example of this kind of thermosetting is Melamine.b) Thermosetting plastics such as bakelite are poor conductor of heat and electricity. Plastics do not conduct electricity and are therefore used in a variety of applications where their insulating properties are needed. Metals Uses Metals and Non metals NCERT Solutions Chapter 5: Coal and Petroleum. Explain why the following are made of thermosetting plastics. b) Electric plugs/switches/plug boards. Why are electric switches, plugs and sockets made of thermosetting plastics 33 Explain the difference between thermoplastics and thermosetting plastics. Electrical plugs and sockets are made from compression moulded polymers, specifically from a thermosetting polymer called urea formaldehyde : it can be compression moulded in mass. Similar to the relationship between a raw and a cooked egg, a cooked egg cannot revert back to its original form once heated, and a thermoset polymer can’t be softened once “set”. Get the answer to all doubts given in exemplar book! Q. Processing thermoset … 8. A thermoset is a polymer that solidifies or “sets” irreversibly when heated or cured. Plastics are among the most versatile insulating materials. They are easily moulded in machines , and can be cast in any shape in dies. Both thermo... Categorise the materials of the following products into ‘can be recycled’ and ‘cannot be recycled’: … Explain why the following are made of thermosetting plastics: (a) Saucepan handles (b) Electric plugs/switches/plug boards 6. (a) Saucepan handles (b) Electric plugs/switches/plug boards . (b) Thermosetting plastics such as bakelite are poor conductors of heat and electricity. Answer: a) Saucepan handles are made of thermosetting plastics because these plastics do not get softened on heating. 3 Question 7: Explain why the following are made of thermosetting plastics. NCERT Solutions for Class 8 Science Chapter 3 Important NCERT Questions 8th Chapter 3 Synthetic Fibres and Plastics NCERT Books for Session 2020-2021 CBSE Board and State Bord Questions No: 7 Part: B So, it is used for making Electric plugs, switches… Thermoset plastic is a synthetic polymer known for its resilience, strength and durability. Find detailed video answer solutions to NCERT Solutions Science , Class 8 Synthetic Fibres and Plastic Exercise questions taught by expert teachers. Why the following are made of thermosetting plastics? Also, thermosetting plastics such as bakelite are poor conductors of heat. Therefore, they are used for making electric plugs, switches, plug boards, etc. That is why it is used for making electric plugs, switches, plug boards, etc. Solution: (a) Thermosetting plastics are bad conductors of heat and so they do not get heated up while cooking. C. PET. (b) They are poor conductor of heat and electricity. Hence, it prevents the hand from getting burned. It is used to make electrical switches and handles of utensils. Q.12: _____ is a poor conductor of heat and electricity that’s why it is used to make electrical switches. Explain why the following are made of thermosetting plastics. (a) Saucepan handles (b) Electric plugs/switches/plug boards. a) Because it resists fire. b) Thermosetting plastics are used in electric plugs/switches/plug boards as … The electric current does not pass through such plastics. Also, thermosetting plastics such as bakelite are poor conductors of heat. Explain the difference between the thermoplastic and thermosetting plastics. On heating thermosetting plastics, it cannot be softened. Thermosetting plastics are used in saucepan handles because they do not soften on heating and also they cannot be bent easily. Q. Also, thermosetting plastics like bakelite, melamine, etc. Therefore, they are used for making electric plugs, switches, plug boards, etc. Metals like iron get rusted when left exposed to moisture and air. Identify the type of plastic that can best be used to make electrical switches. This is the reason it cannot be reshaped once it is molded. The plastics which when moulded once, cannot be softened by heating are called thermosetting plastics. Answer: (a) Thermosetting plastic does not soften on heating. Saucepan handles, electric plugs and switches made of thermosetting plastics because. It has heat resistant properties and is also an electrical insulator. Ans: i) Both A and R are true and R … Q. Explain why the following are made of thermosetting plastics. Q7. Answer: a) The handles of saucepan are made of thermosetting plastic because: 1)they do not become soft on getting heated … Plastics: Plastics are also called as Polymers. Majority of the times, polymers are made up of Carbon, Hydrogen, and Oxygen only. switches and sockets are made up of plastic because plastics are bad conductor of electricity and current can not pass through it so all switches and sockets made up of plastic so that when we touch these can not get electric shot. Access free tutor videos and make learning fun … Question: Explain why the following are made of thermosetting plastics. 7. Question 5. Explain why plastic containers are favoured for storing food. Q.2. 8. Answer 6. Why is plastic suitable for making electrical switches? Because plastic is available that has all the desired qualities needed to make a switch. Go... Hence, they are used for such purposes. Explain why the following are made of thermosetting plastics. B. Polythene. 7. Answer: Thermosetting plastics are those plastics which retain their shape on heating. it absorbs very little water. The cavity (the cooking space) is a metal "cave" with a door on it. Chapter 3 – Synthetic Fibers and Plastics. Normally, thermosets decompose before melting. It is obtained from … (a) Saucepan handles (b) Electric plugs/switches/plug boards Solution : (a) Saucepan handles are made of thermosetting plastics because these plastics do not get softened on heating. So, it’s impossible to recycle thermoset plastics or alter their form in any way. Click to see full answer. Thermoplastics and Thermosetting Plastics: Why They Work Together For centuries, humans have used a variety of polymers such as tars, oils, resins and gums. Injection moulding is the manufacturing process for making plastic parts and products from thermosetting and thermoplastic materials. (a) Saucepan handles (b) Electric plugs/switches/plug boards Soln: Also, thermosetting plastics such as Bakelite are poor conductors of heat. c) Bakelite Answer . Why are electric witches, plugs and sockets made of thermosetting plastics? The types available. After given a shape, they can’t be remolded or softened. The handles of cooking utensils, electric plugs, switches or plugboards are made of thermosetting plastics because: (a) Thermosetting plastics cannot be softened by heating. it has a hard outer, high-gloss finish. Q: Why are switches made up of plastic and not metals? Switches are made up of metal connections, because they’re intended to switch electric curre... 32. (a) Saucepan handles (b) Electric plugs/switches/plug boards. The handles of pressure cookers are made of plastic as they are bad insulators of heat. Explain why the following are made of thermosetting plastics. In thermosetting plastic, the polymer chains form strong cross linked covalent bonds that make it very rigid and hard. ← Prev Question Next Question → Explain why the following are made of thermosetting plastics. (a) Saucepan handles (b) Electric plugs/switches/plug boards. (a) Saucepan handles (b) Electric plugs/switches/plug boards Answer . (a) Explain why the following are made of thermosetting plastics. 7. Answer. A. PVC. (a) The handles of saucepan are made of thermosetting plastic because it is a bad conductor of heat and do not get heated up while cooking. Most plastics are non-conductive, making them decent electrical insulators so that people grasping them are … ? Plastics are bad conductor of heat and electricity Plastics are had conductor of heat and electricity. Thai is why electrical wires have plastic coverings and handles of frying pans are made of plastic. Reason(R)- Bakelite is a thermosetting plastic. Also, thermosetting plastics such as bakelite are poor conductors of heat. Solution: Bakelite is a thermosetting plastic, which means it retains its shape even at high temperatures. It is used to make electrical switches and handles of utensils. Electrical plugs and sockets are made from compression moulded polymers, specifically from a thermosetting polymer called urea formaldehyde : it can be compression moulded in mass. switches and sockets are made up of plastic because plastics are bad conductor of electricity and current can not pass through it so all switches a... Bakelite (a thermosetting plastics) is a poor conductor of heat and electricity. On heating the thermoplastics, it becomes softened and can be molded and reshaped easily. So buy durable best switches … (a) Saucepan handles (b)Electric plugs/switches/plug boards Q7. c) Both. Electric plugs and switches are made of plastics because they are more safer than other materials like iron, copper etc which conduct electricity which is very dangerous while switching plugs so switches and plugs are made of plastics. 7. (a) Saucepan handles (b) Electric plugs/switches/plug boards. Saucepan handles- Saucepan handles are made of thermosetting plastics because the thermosetting plastics do not get softened on heating and also a … are poor conductors of heat and electricity. ☺broke while bending. They are more resistant to high temperature; They maintain their shape and size at high temperature also. Electric plugs / switches / plug boards. Answer: Above articles are made up of bakelite (a thermosetting plastic) because they are– (i) poor conductors of electricity (ii) heat resistant Plastics are durable. Saucepan handles have to withstand high temperatures during cooking and thermosetting plastic is ideal for that. Thermoset and thermoplastic plastic types Thermoset. Why are electric plugs made of plastic. Answer: Thermosetting plastics are used to make electrical switches because these are a poor conductor of heat and electricity. Hence, they are good insulators and prevents from getting electric shocks. Q8. Categorise the materials of the following products into ‘can be recycled’ and ‘cannot be recycled’. Explain why the following are made of thermosetting plastics. These are called thermosetting plastics. Q.1. Ans.Above articles are made up of bakelite (a thermosetting plastic) because it is-- (i) poor conductor of electricity (ii) heat resistant. Saucepan handles. 7. ☺these are used for making Electrical switches handles of various utensils. These plastics like bakelite are poor conductors of heat. Heavily cross-linked polymers come under the category of thermosetting plastics. Articles made of thermosetting plastics Articles made of thermoplastics Fig 3.2.Some articles made … Question 2. Your using your cord connection to act as a disconnect means. This causes the full current draw of the equipment to arc momentarily this causes the... Explain why the following are made of thermosetting plastics. Melamine is used for making floor tiles, kitchenware, and fabrics that resist fire. Answer: Synthetic fibres have replaced natural fibres for most uses. Thus, we use Thermosetting plastic such as Bakelite to make Electric Plugs and Switches. Explain why plastic containers are favoured for storing food. Few years beck most switches were made with ceramic base and Bakelite cover..AS plastic of good quality became available all are made with plastic.... b) Bakelite is a kind of thermosetting plastic which is a bad conductor of heat and electricity. QUE.7- Explain why the following are made of thermo setting plastics.
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