Q. Most commonly used rubber vulcanisation agent is

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Q. Antioxidants are added to rubber to protect it from the attack of light, heat & atmospheric ozone. Which of the following is an antioxident used in rubber ?

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Q. Maximum consumption of polymers is in

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Q. Low density polythene as compared to high density polythene is

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Q. Phenol formaldehyde is produced by condensation polymerisation. It is also known as

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Q. Polymethyl methacrylate, which is an acrylic resin, is also called

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Q. Silicone resins, which are highly water repellant and has good heat resistance can not be used

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Q. Pick out the wrong statement.

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Q. Which of the following rubbers has the widest service temperature range (-75 to 275°C) ?

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Q. Nylon-66 compared to nylon-6 has

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Q. Scouring is a finishing operation during the manufacture of fibre, which aims at __________ of fibres.

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Q. Which of the following is generally not drawn into fibre ?

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Q. Condensation polymerisation of caprolac-tum is carried out in the reactor maintained at a temperature of __________ °C for producing nylon-6.

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Q. Which of the following is not a natural polymer ?

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Q. In case of wet spinning of polymers, the polymer solution is forced through spinnerates into, a coagulating bath to give a filament form. Wet spinning is not used in case of the __________ fibres.

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Q. Melt spinning of polymers involves the forcing of polymer melt through spinnerettes (fine holes) into an atmosphere kept at a temperature lower than the melting point of the polymer, which causes the fine diameter polymer melt to harden into filaments. Melt spinning is not used in case of the __________ fibres.

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Q. Which of the following is not the commercial name of polymethylmethacrylate (PMMA) ?

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Q. Density of low density polythene is about __________ gm/c.c.

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Q. In step growth polymerisation, condensation occurs in a stepwise manner with or without the elimination of smaller molecules. An example of step growth polymerisation product is

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Q. Gutta parcha rubber is

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