General Science - Chemistry

81. Which of these is a biodegradable polymer?
[A] PLA
[B] PCL
[C] PGA
[D] All of the above

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82. Which of the following monomers produce Buna-n polymer?
[A] two parts of butadiene and styrene
[B] four parts of butadiene and one part of isobutylene
[C] two parts of butadiene and one part of acrylonitrile
[D] None of the above

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83. Which of the following carbon compound is used in the polymerisation process to produce polythene?
[A] Methane
[B] Ethene
[C] Ethyne
[D] Benzene

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84. Which of these is not a natural polymer?
[A] Starch
[B] cellulose
[C] Proteins
[D] Bakelite

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85. Which of the following is a cross linked polymer?
[A] Bakelite
[B] Melamine
[C] Formaldehyde resin
[D] All of the above

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86. Which of the following metal is the key component of Vitamin B12?
[A] Iron
[B] Zinc
[C] Copper
[D] Cobalt

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87. Which of the following metals is involved in the anodisation process?
[A] Aluminium
[B] Copper
[C] Bismuth
[D] Calcium

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88. Which of the following metals is commonly used to increase the strength of steel alloys?
[A] Bismuth
[B] Boron
[C] Tin
[D] Molybdenum

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89. Which metal has the highest melting point among all metals?
[A] Tungsten
[B] Ruthenium
[C] Gold
[D] Bismuth

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90. Which of these is the only metal that is liquid at ordinary room temperature and pressure?
[A] Copper
[B] Zinc
[C] Mercury
[D] Beryllium

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