Polymer Technology

191. Softening point of high density polythene is about _________ °C.

1. 85
2. 135
3. 165
4. 205

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192. Starting material for the production of butadiene in India is

1. Naphthalene
2. Benzol
3. Ethyl alcohol
4. Phthalic anhydride

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193. Starting material for the production of SBR is

1. Ethyl alcohol
2. Ethylene
3. Both (A) & (B)
4. Neither (A) nor (B)

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194. Styrene butadiene rubber (SBR) as compared to natural rubber has

1. Poor tensile strength
2. Poorer resistance
3. Greater amount of heat build up heavy loading
4. All (A), (B) and (C)

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195. Styrene butadiene rubber (SBR) is never used for making

1. Coated fabrics
2. Front wheel tyres of aeroplanes (i.e., heavy duty tyres)
3. Gaskets
4. Soles of shoes

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196. Styrene butadiene rubber is commercially manufactured by

1. Bulk polymerisation
2. Suspension polymerisation
3. Solution polymerisation
4. Emulsion polymerisation

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197. Styrene which is a monomer for the production of polystyrene, is commercially produced by the

1. Catalytic dehydrogenation of ethyl benzene
2. Dehydration of ethyl alcohol followed by hydrogenation
3. Reacting ethylene oxide with acetaldehyde
4. Fermentation of starch

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198. Synthetic polymer produced by using terephthalic acid and ethylene glycol is

1. Terylene
2. Nylon-66
3. PVC
4. Polystyrene

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199. Synthetic rubber

1. Deforms, if stretched to double of its original dimension
2. Is brittle at low temperature
3. Is softer at higher temperature
4. Is highly permeable to air & water and is readily attacked by chemicals & atmospheric gases

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200. Teflon is

1. Phenol formaldehyde
2. An inorganic polymer
3. Polytetrafluroethylene (PTFE)
4. A monomer

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