61. Which of the following additives are added to plastics to make it impervious to X-rays?
62. Mastication of rubber means
63. Tubeless tyres are made of __________ rubber, which is a co-polymer of isoprene & isobutylene.
64. Branched chair polymers as compared to linear polymers have
65. __________ is normally used for the manufacture of refrigerator components and transistor parts.
66. Pick out the wrong statement.
67. 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?
68. Nylon-6 as compared to nylon-66 is
69. Buna-S is a __________ material.
70. Density of high density polythene is about __________ gm/c.c.
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