Plastics are generally?

Plastics are generally?
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Synthetic polymers
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Pumping of a corrosive liquid is generally preferred to be done by a __________ pump, as it can be made of a variety of materials including plastics. (A) Piston (B) Gear (C) Positive displacement (D) Sump

Description : Pumping of a corrosive liquid is generally preferred to be done by a __________ pump, as it can be made of a variety of materials including plastics. (A) Piston (B) Gear (C) Positive displacement (D) Sump

Last Answer : (B) Gear

Pick up the correct statement from the following: (A) Plastics have generally low melting point (B) The coefficient of thermal expansion of plastics is about three times than that of steel (C) The acoustical boards prepared by impregnating fibre-glass with phenolic resins has absorption coefficient of about 0.67 (D) All the above

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I need ways to test/get data about homemade plastics. What can I do with Flexural Strength and Flexural Modulus...

Description : I need ways to test/get data about homemade plastics. What can I do with Flexural Strength and Flexural Modulus...

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Which plastics can helium support?

Description : Which plastics can helium support?

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The substances used in colour paints, fil- ters, plastics and other materials?

Description : The substances used in colour paints, fil- ters, plastics and other materials?

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Which type of plastics is used for mak- ing adhesives; button etc?

Description : Which type of plastics is used for mak- ing adhesives; button etc?

Last Answer : Urea formaldehyde

The compound of chlorine used in the plastics?

Description : The compound of chlorine used in the plastics?

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Why is it better to use plant and animal based products in place of petroluem and plastics?

Description : Why is it better to use plant and animal based products in place of petroluem and plastics?

Last Answer : This is my midterm essay question which I have researched on my own. But I am at a loss.

When I do the dishes, why do the plastics sometimes end up greasy?

Description : When I do the dishes, why do the plastics sometimes end up greasy?

Last Answer : answer:I've noticed that too, must have something to do with the grease sticking to the plastic more. I always use tons of soap and rinse really well as I also have a phobia about tasting soap. ... run it for the same reason and because somewhere, deep down, I think it is inferior to hand washing.

Why not get a small chipper and chip non-recyclable plastics into small pieces before dumping?

Description : Why not get a small chipper and chip non-recyclable plastics into small pieces before dumping?

Last Answer : Because a landfill full of sharp plastic shards is not good for the enviroment. Also given that it won't speed up the rate decomposition I think it isn't worth the effort. Add on ... overall it's probably worsefor the enviroment. It would be better to boycot companies that use plastic packaging.

Do you remember the many questions on safe/unsafe plastics for water bottles, food storage, Nalgene, etc?

Description : Do you remember the many questions on safe/unsafe plastics for water bottles, food storage, Nalgene, etc?

Last Answer : answer:Here's a summary; http://tinyurl.com/3jdkmj And one of many from ask-public: http://www.ask-public.com/disc/466/water-bottles-plastic-glass-stainless-steel-or/ Similar articles in all ... (the white waxy, shiny coating). Tomatoes and other acid foods may leach more severely. Buyer beware.

Should we start mining old landfill sites for plastics and other recyclable material?

Description : Should we start mining old landfill sites for plastics and other recyclable material?

Last Answer : I don’t see why not! I think it could be worth it. Then we wouldnt have to cut down as many trees to get new stuff. All the stuff at the dump is just going to sit there anyways.

what are extruded plastics

Description : what are extruded plastics

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How can we reduce the use of plastics in our daily life?

Description : How can we reduce the use of plastics in our daily life?

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Would a low-temp glue gun be better than a high-temp glue gun for plastics?

Description : Would a low-temp glue gun be better than a high-temp glue gun for plastics?

Last Answer : A low temperature glue gun would be best because there would be less damage to the plastic from the heated glue.

Which of the following is a biodegradable waste? (1) Wool (2) Polythene bags (3) Plastics (4) Nylon

Description : Which of the following is a biodegradable waste? (1) Wool (2) Polythene bags (3) Plastics (4) Nylon

Last Answer : (1) Wool

On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because – (1) metals have higher thermal capacity than plastics (2) plastics have a lower density than metals (3) metals are good conductors of heat (4) plastics have a higher thermal conductivity than metals

Description : On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because - (1) metals ... metals (3) metals are good conductors of heat (4) plastics have a higher thermal conductivity than metals

Last Answer : (3) metals are good conductors of heat Explanation: On a chilly day, the room temperature is lower than our body temperature. Since metals have a higher coefficient of thermal conductivity than plastic, they ... from our fingers will flow to the metal cap much more quickly than to the plastic body.

'Corrosion-resistant material' and 'noncorrodible material' will include which of the following ____________. A. plastics B. silver C. copper-nickel D. all of the above

Description : 'Corrosion-resistant material' and 'noncorrodible material' will include which of the following ____________. A. plastics B. silver C. copper-nickel D. all of the above

Last Answer : Answer: D

Bakelite (phenol-formaldehyde) resin cannot be used as (A) Decorative paint (B) Decorative laminates (C) Electrical insulation (D) Glass reinforced plastics

Description : Bakelite (phenol-formaldehyde) resin cannot be used as (A) Decorative paint (B) Decorative laminates (C) Electrical insulation (D) Glass reinforced plastics

Last Answer : (A) Decorative paint

Visco-elastic behaviour exhibited by plastics is a __________ like behaviour. (A) Solid (B) Liquid (C) Combination of solid & liquid (D) Neither solid nor liquid

Description : Visco-elastic behaviour exhibited by plastics is a __________ like behaviour. (A) Solid (B) Liquid (C) Combination of solid & liquid (D) Neither solid nor liquid

Last Answer : (C) Combination of solid & liquid

__________ moulding is used for shaping of thermosetting plastics exclusively. (A) Compression (B) Injection (C) Transfer (D) Extrusion

Description : __________ moulding is used for shaping of thermosetting plastics exclusively. (A) Compression (B) Injection (C) Transfer (D) Extrusion

Last Answer : (C) Transfer

Plasticisers are added to synthetic plastics to (A) Impart flexibility (B) Improve workability during fabrication(C) Develop new improved properties not present in the original resin(D) All (A), (B) and (C)

Description : Plasticisers are added to synthetic plastics to (A) Impart flexibility (B) Improve workability during fabrication (C) Develop new improved properties not present in the original resin (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

Pick out the correct statement. (A) Plastics are good conductors of heat and electricity (B) All the polymers are highly crystalline in nature (C) Polymers can be vaporised by heating to a very high temperature (D) The liquid polymer becomes greasy, then waxy and finally solid on increasing the degree of polymerisation

Description : Pick out the correct statement. (A) Plastics are good conductors of heat and electricity (B) All the polymers are highly crystalline in nature (C) Polymers can be vaporised by heating to ... D) The liquid polymer becomes greasy, then waxy and finally solid on increasing the degree of polymerisation

Last Answer : (D) The liquid polymer becomes greasy, then waxy and finally solid on increasing the degree of polymerisation

Most of the plastics are safe to be used upto a maximum temperature of __________ °C. (A) 100 (B) 150 (C) 350 (D) 450

Description : Most of the plastics are safe to be used upto a maximum temperature of __________ °C. (A) 100 (B) 150 (C) 350 (D) 450

Last Answer : (B) 150

Molecular weights of plastics ranges from (A) 1000 to 5000 (B) 5000 to 1000 (C) 20000 to 25000 (D) 10 9 to 10

Description : Molecular weights of plastics ranges from (A) 1000 to 5000 (B) 5000 to 1000 (C) 20000 to 25000 (D) 10 9 to 10

Last Answer : (C) 20000 to 25000

Which of the following additives are added to plastics to make it impervious to X-rays? (A) Asbestos (B) Barium salt (C) Carborundum (D) Phthalic acid

Description : Which of the following additives are added to plastics to make it impervious to X-rays? (A) Asbestos (B) Barium salt (C) Carborundum (D) Phthalic acid

Last Answer : (B) Barium salt

Plastics are (A) Used in very high temperature applications (B) Non-biodegradable (C) Not suitable for drainage pipe manufacture (D) All (A), (B) & (C)

Description : Plastics are (A) Used in very high temperature applications (B) Non-biodegradable (C) Not suitable for drainage pipe manufacture (D) All (A), (B) & (C)

Last Answer : (B) Non-biodegradable

Interchain forces are the weakest in case of (A) Plastics (B) Fibres (C) Elastomers (D) Both rubber & elastomers

Description : Interchain forces are the weakest in case of (A) Plastics (B) Fibres (C) Elastomers (D) Both rubber & elastomers

Last Answer : (D) Both rubber & elastomers

Creep is not exhibited at low temperature by (A) Rubber (B) Acrylics (C) Lead (D) Plastics

Description : Creep is not exhibited at low temperature by (A) Rubber (B) Acrylics (C) Lead (D) Plastics

Last Answer : (C) Lead

__________ moulding process cannot be used for thermoplastic plastics. (A) Compression (B) Extrusion (C) Injection (D) None of these

Description : __________ moulding process cannot be used for thermoplastic plastics. (A) Compression (B) Extrusion (C) Injection (D) None of these

Last Answer : (C) Injection

Which are plastics? Name their different types and processes by which they are manufactured. Discuss the impact of the use of plastics on the environment.

Description : Which are plastics? Name their different types and processes by which they are manufactured. Discuss the impact of the use of plastics on the environment.

Last Answer : What is plastic? Plastic is a common name for Polymers: materials made of long strings of carbon and other elements. Each unit in a string is called a monomer, and is a chemical usually ... or hardened by heat. Some typical thermosets are: * Bakelite * Epoxy * Melamine * Polyester * Polyurethane

Differentiate between any five of the following: a) Thermoplastics and thermosetting plastics b) Lunar eclipse and solar eclipse c) Asteroid and meteorite d) Renewable and non-renewable energy resources e) Endothermic and exothermic reactions f) Star and planet g) Nuclear fission and nuclear fusion

Description : Differentiate between any five of the following: a) Thermoplastics and thermosetting plastics b) Lunar eclipse and solar eclipse c) Asteroid and meteorite d) Renewable and non-renewable energy resources e) Endothermic and exothermic reactions f) Star and planet g) Nuclear fission and nuclear fusion

Last Answer : a) Thermoplastics and thermosetting plastics: Thermoplastics: Thermoplastics can be repeatedly softened by heating and hardened by cooling.Thermoplastic molecules, which are linear or slightly branched, do ... or explode in midair. Remains of meteoroids that reach the surface are called meteorites.

Visco-elastic behaviour of materials which is time dependent is common in (A) Plastics (B) Crystalline solid (C) Non-crystalline solids (D) Non-crystalline organic polymer

Description : Visco-elastic behaviour of materials which is time dependent is common in (A) Plastics (B) Crystalline solid (C) Non-crystalline solids (D) Non-crystalline organic polymer

Last Answer : (D) Non-crystalline organic polymer

Pick out the wrong statement. (A) Pure rubber is as useless as pure gold as a material of construction (B) Thermal conductivity of aluminium is higher than that of copper; henceit is increasingly used for utensil making(C) Copper has poor weldability(D) Reinforced plastics are made from both thermoplastic as well asthermosetting plastics

Description : Pick out the wrong statement. (A) Pure rubber is as useless as pure gold as a material of construction (B) Thermal conductivity of aluminium is higher than that of copper; henceit is ... has poor weldability (D) Reinforced plastics are made from both thermoplastic as well as thermosetting plastics

Last Answer : (B) Thermal conductivity of aluminium is higher than that of copper; henceit is increasingly used for utensil making

Which of the following are conductors? a) Ceramics b) Plastics c) Mercury d) Rubber

Description : Which of the following are conductors? a) Ceramics b) Plastics c) Mercury d) Rubber

Last Answer : c) Mercury

Hard pitch is used for making (A) Pulverised fuel (B) Perfumes (C) Insecticides (D) Plastics

Description : Hard pitch is used for making (A) Pulverised fuel (B) Perfumes (C) Insecticides (D) Plastics

Last Answer : (A) Pulverised fuel

What is the purpose of plasticizers? (a) Harden plastics (b) Soften plastics (c) Initiate polymerizations (d) Cross-link polymer chains

Description : What is the purpose of plasticizers? (a) Harden plastics (b) Soften plastics (c) Initiate polymerizations (d) Cross-link polymer chains

Last Answer : Soften plastics

Molecular weight of plastics ranges from (A) 5000 to 10000(B) 20000 to 250000 (C) 500 to 5000 (D) 106 to 109

Description : Molecular weight of plastics ranges from (A) 5000 to 10000 (B) 20000 to 250000 (C) 500 to 5000 (D) 106 to 109

Last Answer : (B) 20000 to 250000

Plasticisers are added to synthetic plastics to (A) Impart flexibility (B) Improve workability during fabrication (C) Develop new improved properties not present in the original resins (D) All (A), (B) and (C)

Description : Plasticisers are added to synthetic plastics to (A) Impart flexibility (B) Improve workability during fabrication (C) Develop new improved properties not present in the original resins (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

Exposure to __________ accelerates the degradation of plastics. (A) Ultraviolet radiation (B) High atmospheric temperature (C) High ambient temperature (D) Damp atmosphere

Description : Exposure to __________ accelerates the degradation of plastics. (A) Ultraviolet radiation (B) High atmospheric temperature (C) High ambient temperature (D) Damp atmosphere

Last Answer : A) Ultraviolet radiation

Plastics as a material of construction suffer from the drawback of low (A) Machinability (B) Density (C) Strength (D) Plastic deformatio

Description : Plastics as a material of construction suffer from the drawback of low (A) Machinability (B) Density (C) Strength (D) Plastic deformatio

Last Answer : Option C

The plastics prepared from Vinyl resin are (A) Odourless (B) Non-toxic (C) Transparent (D) All of these

Description : The plastics prepared from Vinyl resin are (A) Odourless (B) Non-toxic (C) Transparent (D) All of these

Last Answer : civil-engineering

Pick up the non-inflammable plastic from the following: (A) Cellulose acetate plastics (B) Polyvinyl chloride plastics (C) Phenol formaldehyde plastic (D) Urea formaldehyde plastic

Description : Pick up the non-inflammable plastic from the following: (A) Cellulose acetate plastics (B) Polyvinyl chloride plastics (C) Phenol formaldehyde plastic (D) Urea formaldehyde plastic

Last Answer : Answer: Option B

Pick up the incorrect statement from the following: (A) Plastics are chemical resistant (B) Plastics are durable (C) Plastics are ductile (D) Plastics are excellent electric insulators

Description : Pick up the incorrect statement from the following: (A) Plastics are chemical resistant (B) Plastics are durable (C) Plastics are ductile (D) Plastics are excellent electric insulators

Last Answer : Answer: Option C

The plastics made from cellulose resin (A) Are as clear as glass (B) Are tough and strong (C) Possess excellent electrical properties (D) All the above

Description : The plastics made from cellulose resin (A) Are as clear as glass (B) Are tough and strong (C) Possess excellent electrical properties (D) All the above

Last Answer : Answer: Option D

Plastics are compounds of carbon with element (A) Hydrogen (B) Nitrogen (C) Oxygen (D) All of thes

Description : Plastics are compounds of carbon with element (A) Hydrogen (B) Nitrogen (C) Oxygen (D) All of thes

Last Answer : Answer: Option D

Plastics are (A) Good conductors of heat. (B) Good conductors of electricity. (C) Bad conductors of electricity. (D) High density.

Description : Plastics are (A) Good conductors of heat. (B) Good conductors of electricity. (C) Bad conductors of electricity. (D) High density.

Last Answer : (C) Bad conductors of electricity.

Which of the following statement is false? (1) Polystyrene was discovered in 1839 by Edward Simon (2) It is used for making plastics and CD cases (3) It is not biodegradable (4) None of these

Description : Which of the following statement is false? (1) Polystyrene was discovered in 1839 by Edward Simon (2) It is used for making plastics and CD cases (3) It is not biodegradable (4) None of these 

Last Answer : None of these

Which of the following is a biodegradable waste ? (1) Wool (2) Polythene bags (3) Plastics (4) Nylon

Description : Which of the following is a biodegradable waste ? (1) Wool (2) Polythene bags (3) Plastics (4) Nylon

Last Answer : Wool