In vulcanisation, with which the natural rubber is heated?

In vulcanisation, with which the natural rubber is heated?
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Sulphur
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In vulcanisation, with which the natural rubber is heated? -Do You Know?

Description : In vulcanisation, with which the natural rubber is heated? -Do You Know?

Last Answer : answer:

Fillers such as zinc oxide and carbon black are added to the crude natural rubber before vulcanisation in order to improve its (A) Elasticity (B) Strength (C) Plasticity (D) Weathering characteristics

Description : Fillers such as zinc oxide and carbon black are added to the crude natural rubber before vulcanisation in order to improve its (A) Elasticity (B) Strength (C) Plasticity (D) Weathering characteristics

Last Answer : (D) Weathering characteristics

In vulcanisation of rubber,

Description : In vulcanisation of rubber,

Last Answer : In vulcanisation of rubber, A. sulphur reacts to form new compound B. sulphur cross-links are ... layer over rubber D. all the statements are correct

Which one of the following statements is not correct? Vulcanisation of rubber makes it - (1) soft and flexible (2) strong and hard (3) chemical resistant (4) withstand higher temperatures

Description : Which one of the following statements is not correct? Vulcanisation of rubber makes it - (1) soft and flexible (2) strong and hard (3) chemical resistant (4) withstand higher temperatures

Last Answer : (1) soft and flexible Explanation: In order to give more strength and more elasticity, natural rubber is heated with sulphur or sulphur compounds at 150°C temperature. Vulcanized rubber has good ... of vulcanized rubber is enhanced up to 100°C. It has good resistance to organic solvents.

In vulcanisation process, rubber can be hardened by adding - (1) Nitrogen (2) Silicon (3) Sulphur (4) Alcohol

Description : In vulcanisation process, rubber can be hardened by adding - (1) Nitrogen (2) Silicon (3) Sulphur (4) Alcohol

Last Answer : (3) Sulphur Explanation: In order to give more strength and more elasticity, natural rubber is heated with sulphur or sulphur compounds at 150°C temperature. Vulcanized rubber has good tensile strength.

The process involved in converting rubber into a thin sheet or coating it on fabric is called (A) Extrusion (B) Mastication (C) Calendaring (D) Vulcanisation

Description : The process involved in converting rubber into a thin sheet or coating it on fabric is called (A) Extrusion (B) Mastication (C) Calendaring (D) Vulcanisation

Last Answer : (C) Calendaring

Vulcanisation of rubber does not increase its (A) Softness (B) Oxidation resistance (C) Weight & strength (D) Elasticity & water solubility

Description : Vulcanisation of rubber does not increase its (A) Softness (B) Oxidation resistance (C) Weight & strength (D) Elasticity & water solubility

Last Answer : (A) Softness

Vulcanisation of rubber does not increase its (A) Elasticity(B) Plasticity(C) Ductility(D) None of these

Description : Vulcanisation of rubber does not increase its (A) Elasticity (B) Plasticity (C) Ductility (D) None of these

Last Answer : (B) Plasticity

Vulcanisation of rubber (A) Decreases its tensile strength (B) Increases its ozone & oxygen reactivity (C) Increases its oil & solvent resistance (D) Converts its plasticity into elasticity

Description : Vulcanisation of rubber (A) Decreases its tensile strength (B) Increases its ozone & oxygen reactivity (C) Increases its oil & solvent resistance (D) Converts its plasticity into elasticity

Last Answer : (D) Converts its plasticity into elasticity

Peptizers like aromatic mercaptans (e.g. thiophenes) are added in rubber to (A) Protect rubber goods from attack by oxygen & ozone present in the atmosphere (B) Reduce its viscosity to permit easier processing (C) Reduce the time of vulcanisation and quantity of vulcanising agent (D) Increase its viscosity

Description : Peptizers like aromatic mercaptans (e.g. thiophenes) are added in rubber to (A) Protect rubber goods from attack by oxygen & ozone present in the atmosphere (B) Reduce its viscosity to ... processing (C) Reduce the time of vulcanisation and quantity of vulcanising agent (D) Increase its viscosity

Last Answer : (B) Reduce its viscosity to permit easier processing

Vulcanisation of raw rubber makes it (A) Soft (B) Less elastic (C) Plastic (D) Tacky

Description : Vulcanisation of raw rubber makes it (A) Soft (B) Less elastic (C) Plastic (D) Tacky

Last Answer : (B) Less elastic

Most commonly used rubber vulcanisation agent is (A) Sulphur (B) Bromine (C) Platinum (D) Alumina

Description : Most commonly used rubber vulcanisation agent is (A) Sulphur (B) Bromine (C) Platinum (D) Alumina

Last Answer : (A) Sulphur

Vulcanisation of rubber decreases its (A) Tensile strength (B) Resistance to organic solvents (C) Tackiness (D) Working temperature range

Description : Vulcanisation of rubber decreases its (A) Tensile strength (B) Resistance to organic solvents (C) Tackiness (D) Working temperature range

Last Answer : (C) Tackiness

Vulcanisation of rubber (A) Decreases its tensile strength (B) Increases its ozone & oxygen reactivity (C) Increases its oil & solvent resistance (D) Converts its plasticity into elasticity

Description : Vulcanisation of rubber (A) Decreases its tensile strength (B) Increases its ozone & oxygen reactivity (C) Increases its oil & solvent resistance (D) Converts its plasticity into elasticity

Last Answer : (D) Converts its plasticity into elasticity

The process involved in converting rubber into a thin sheet or coating it on fabric is called (A) Extrusion (B) Mastication (C) Calendaring (D) Vulcanisation

Description : The process involved in converting rubber into a thin sheet or coating it on fabric is called (A) Extrusion (B) Mastication (C) Calendaring (D) Vulcanisation

Last Answer : (C) Calendaring

__________ of rubber decreases after its vulcanisation. (A) Resistance to the action of organic solvent (B) Tackiness (C) Maximum service temperature (D) Tensile strength

Description : __________ of rubber decreases after its vulcanisation. (A) Resistance to the action of organic solvent (B) Tackiness (C) Maximum service temperature (D) Tensile strength

Last Answer : (B) Tackiness

In vulcanisation process, rubber can be hardened by adding (1) Nitrogen (2) Silicon (3) Sulphur (4) Alcohol

Description : In vulcanisation process, rubber can be hardened by adding (1) Nitrogen (2) Silicon (3) Sulphur (4) Alcohol

Last Answer : Sulphur

Which one of the following statements is not correct? Vulcanisation of rubber makes it (1) soft and flexible (2) strong and hard (3) chemical resistant (4) withstand higher temperatures

Description : Which one of the following statements is not correct? Vulcanisation of rubber makes it (1) soft and flexible (2) strong and hard (3) chemical resistant (4) withstand higher temperatures

Last Answer : soft and flexible

In vulcanization, natural rubber is heated with- (1) Carbon (2) Sulphur (3) Silicon (4) Phosphorus

Description : In vulcanization, natural rubber is heated with- (1) Carbon (2) Sulphur (3) Silicon (4) Phosphorus

Last Answer : (2) Sulphur Explanation: Vulcanization of rubber is a process of improvement of the rubber elasticity and strength by heating it in the presence of sulfur, which results in three-dimensional crosslinking of the chain rubber molecules (polyisoprene) bonded to each other by sulfur atoms.

Size reduction of __________ is accomplished in steam heated rollers and roll crushers. (A) Resins (B) Gums (C) Hard rubber (D) Waxes

Description : Size reduction of __________ is accomplished in steam heated rollers and roll crushers. (A) Resins (B) Gums (C) Hard rubber (D) Waxes

Last Answer : (C) Hard rubber

Vulcanisation was developed by?

Description : Vulcanisation was developed by?

Last Answer : Charles Good Year

A cube, sphere & a thin circular plate (all having same mass and made of same material) are all heated to 300°C and allowed to cool in natural air. Which one will cool the slowest? (A) Cube (B) Plate (C) Sphere (D) All will cool at the same rate

Description : A cube, sphere & a thin circular plate (all having same mass and made of same material) are all heated to 300°C and allowed to cool in natural air. Which one will cool the slowest? (A) Cube (B) Plate (C) Sphere (D) All will cool at the same rate

Last Answer : (D) All will cool at the same rate

Pick out the wrong statement. (A) In process heat exchangers, saturated steam is preferred over the superheated steam (B) The maximum is the emissive power of a surface at a temperature T1 occurs at a wavelength of λ1 . If the surface temperature is halved, the maximum in the emissive power would occur at a wavelength of 0.5 λ1 (C) When a vertical plate is heated in infinite air environmental under natural convection conditions, the velocity profile in air, normal to the plate, exhibits a maximum

Description : Pick out the wrong statement. (A) In process heat exchangers, saturated steam is preferred over the superheated steam (B) The maximum is the emissive power of a surface at a temperature T1 ... under natural convection conditions, the velocity profile in air, normal to the plate, exhibits a maximum

Last Answer : (B) The maximum is the emissive power of a surface at a temperature T1 occurs at a wavelength of λ1 . If the surface temperature is halved, the maximum in the emissive power would occur at a wavelength of 0.5 λ1

In reverberatory furnace, charge is heated mainly by (A) Conduction (B) Natural convection (C) Radiation of heat from the roof of the combustion chamber (D) None of these

Description : In reverberatory furnace, charge is heated mainly by (A) Conduction (B) Natural convection (C) Radiation of heat from the roof of the combustion chamber (D) None of these

Last Answer : (C) Radiation of heat from the roof of the combustion chamber

1. Who was the only Indian woman who became President of WHO? 2. When water is heated from 0 degree C to 20 degree C, how does its volume change? 3. Which is a form of heart disease in which blood supply to the heart is inadequate? 4. Which natural region is best known for the production of grapes? 5. Which is an example of Mauryan art ?

Description : 1. Who was the only Indian woman who became President of WHO? 2. When water is heated from 0 degree C to 20 degree C, how does its volume change? 3. Which is a form of heart disease in ... is the largest temperate desert of the world? 20. In whose rule was Islam, as the state religion, abolished?

Last Answer : Answer : 1. Raj Kumari Amrit Kaur 2. It shall increase 3. Angina 4. Mediterranean 5. Bull capital, Rampurva 6. The Union Home Minister 7. Sodium or potassium salts of heavier fatty acids 8. 1994 9. ... .A.-Russia 15. In Cambodia 16. 5 17. Painting 18. Revenue receipts 19. Patagonian desert 20. Akbar

Name the state which grows most of India’s natural rubber. -SST 10th

Description : Name the state which grows most of India’s natural rubber. -SST 10th

Last Answer : Kerala grows most of India’s natural rubber accounting for three-fourth of the Indian output.

What is natural rubber? -Biology

Description : What is natural rubber? -Biology

Last Answer : answer:

What percentage of country’s demand for natural rubber is met by in indigenous production? -General Knowledge

Description : What percentage of country’s demand for natural rubber is met by in indigenous production? -General Knowledge

Last Answer : The answer is '97%'

In the world production of natural rubber, what is the rank of India? -Do You Know?

Description : In the world production of natural rubber, what is the rank of India? -Do You Know?

Last Answer : answer:

What percentage of country’s demand for natural rubber is met by in indigenous production? -General Knowledge

Description : What percentage of country’s demand for natural rubber is met by in indigenous production? -General Knowledge

Last Answer : answer:

Natural rubber is a polyer of:

Description : Natural rubber is a polyer of:

Last Answer : Natural rubber is a polyer of: A. ethylene B. vinyl chloride C. phenol D. isoprene

Natural rubber is a polymer of:

Description : Natural rubber is a polymer of:

Last Answer : Natural rubber is a polymer of: A. trans-isoprene B. cis-isoprene C. co-cis and trans-isoprene D. none of these

Synthetic polymer which resembler natural rubber is:

Description : Synthetic polymer which resembler natural rubber is:

Last Answer : Synthetic polymer which resembler natural rubber is: A. neoprene B. chloroprene C. glyptal D. nylon

Natural rubber is:

Description : Natural rubber is:

Last Answer : Natural rubber is: A. Polyisoprene B. Polyvinyl chloride C. Polychloroprene D. Polyfluoroethylene

What Synthetic rubber has different monomers than natural rubber.?

Description : What Synthetic rubber has different monomers than natural rubber.?

Last Answer : synthetic rubber has different monomers than natural rubber.

Which automotive tires use natural rubber?

Description : Which automotive tires use natural rubber?

Last Answer : Most tires made today use a combination of natural rubber and synthetic rubber to achieve the maximum tread life and safety rating.

Which country is the largest producer of natural rubber in the world?

Description : Which country is the largest producer of natural rubber in the world?

Last Answer : Thailand

Which of the following items and leading producer is not correctly matched? (a) Red chillies - Andhra Pradesh (b) Saffron - Jammu & Kashmir (c) Ginger - Sikkim (d) Natural rubber- Kerala

Description : Which of the following items and leading producer is not correctly matched? (a) Red chillies - Andhra Pradesh (b) Saffron - Jammu & Kashmir (c) Ginger - Sikkim (d) Natural rubber- Kerala

Last Answer : Ans: (c)

Which one of the following Indian States is the largest producer of natural rubber? [NDA 2004] (a) Tamil Nadu (b) Assam (c) Kerala (d) Andhra Pradesh

Description : Which one of the following Indian States is the largest producer of natural rubber? [NDA 2004] (a) Tamil Nadu (b) Assam (c) Kerala (d) Andhra Pradesh

Last Answer : Ans: (b)

Bulk of natural rubber in India is produced in – (1) Andhra Pradesh (2) Kerala (3) Karnataka (4) Tamil Nadu

Description : Bulk of natural rubber in India is produced in – (1) Andhra Pradesh (2) Kerala (3) Karnataka (4) Tamil Nadu

Last Answer : (2) Kerala Explanation: The areas in India on which the rubber is produced can be divided into Two zones - traditional and nontraditional. Taditional zone comprises of the southwest coastal regions of ... is from Kerala. Kerala and Tamil Nadu share 86% of the growing area of natural rubber.

Which of the following is a protein? (1) Wool (2) Starch (3) Natural rubber (4) Cellulose

Description : Which of the following is a protein? (1) Wool (2) Starch (3) Natural rubber (4) Cellulose

Last Answer : (3) Natural rubber Explanation: Natural Rubber is an elastic substance obtained from the latex sap of trees, especially those trees which belong to the genera Hevea and Ficus.

Natural rubber is a polymer derived from? (1) ethylene (2) propylene (3) isoprene (4) butadiene

Description : Natural rubber is a polymer derived from? (1) ethylene (2) propylene (3) isoprene (4) butadiene

Last Answer : (3) isoprene Explanation: Natural rubber is an addition polymer that is obtained as a milky white fluid known as latex from a tropical rubber tree.

Natural rubber is a polymer of – (1) Vinyl acetate (2) Propene (3) Isoprene (4) Styrene

Description : Natural rubber is a polymer of – (1) Vinyl acetate (2) Propene (3) Isoprene (4) Styrene

Last Answer : (3) Isoprene Explanation: Natural rubber consists of suitable polymers of the organic compound isoprene, with minor impurities of other organic compounds plus water. Isoprene is produced and emitted by ... trees into the atmosphere (major producers are oaks, poplars, eucalyptus, and some legumes).

Natural rubber is the polymer of : (1) Isoprene (2) Styrene (3) Butadiene (4) Ethylene

Description : Natural rubber is the polymer of : (1) Isoprene (2) Styrene (3) Butadiene (4) Ethylene

Last Answer : (1) Isoprene Explanation: Isoprene was first isolated by thermal decomposition of natural rubber. About 95% of isoprene production is used to produce cis-1,4- polyisoprene—a synthetic version of natural rubber.

Natural rubber is a polymer derived from - (1) ethylene (2) propylene (3) isoprene (4) butadiene

Description : Natural rubber is a polymer derived from - (1) ethylene (2) propylene (3) isoprene (4) butadiene

Last Answer : (3) isoprene Explanation: Natural rubber is an addition polymer that is obtained as a milky white fluid known as latex from a tropical rubber tree.

The substance that is added to make natural rubber strong and more bouncy is – (1) Polythene (2) Sponge (3) Sulphur (4) Chlorine

Description : The substance that is added to make natural rubber strong and more bouncy is – (1) Polythene (2) Sponge (3) Sulphur (4) Chlorine

Last Answer : (3) Sulphur Explanation: Vulcanization is a chemical process for converting rubber or related polymers into more durable materials via the addition of sulfur or other equivalent "curatives ... individual polymer chains. Vulcanized materials are less sticky and have superior mechanical properties.

The basic chemical building block of natural rubber obtained from trees is – (1) Isoprene (2) Vinyl Chloride (3) Acetylene (4) Neoprene

Description : The basic chemical building block of natural rubber obtained from trees is – (1) Isoprene (2) Vinyl Chloride (3) Acetylene (4) Neoprene

Last Answer : (1) Isoprene Explanation: Isoprene was first isolated by thermal decomposition of natural rubber. About 95% of isoprene production is used to produce cis-1,4- polyisoprene---a synthetic version of natural ... consists mainly of poly-cis-isoprene with a molecular weight of 100,000 to 1,000,000.

Natural rubber is a polymer of?

Description : Natural rubber is a polymer of?

Last Answer : Isoprene

Constituent of natural rubber?

Description : Constituent of natural rubber?

Last Answer : Isoprene

Pick out the wrong statement. (A) Polymers made of only one monomer is called homopolymer (B) Polymers made of more than one monomer is called copolymer or mixed polymer (C) Vulcanised rubber is more elastic than natural rubber

Description : Pick out the wrong statement. (A) Polymers made of only one monomer is called homopolymer (B) Polymers made of more than one monomer is called copolymer or mixed polymer (C) Vulcanised rubber is more elastic than natural rubber

Last Answer : (A) Polymers made of only one monomer is called homopolyme