Q. Plasticisers are added to polymers to improve their

  • (A) Tensile strength
  • (B) Softness & flexibility
  • (C) Acid resistance
  • (D) Alkali resistance
πŸ’¬ Discuss
βœ… Correct Answer: (B) Softness & flexibility

Q. DDT is shipped in

  • (A) Stainless steel containers
  • (B) Paper bags
  • (C) Fibre drums
  • (D) Either B or C
πŸ’¬ Discuss
βœ… Correct Answer: (D) Either B or C

Q. 'Age hardening' of duralumin is due to

  • (A) Copper
  • (B) Magnesium
  • (C) Both A & B
  • (D) Neither A nor B
πŸ’¬ Discuss
βœ… Correct Answer: (C) Both A & B

Q. The ability of a material to offer resistance to scratching or indentation is a measure of its

  • (A) Brittleness
  • (B) Toughness
  • (C) Hardness
  • (D) Resilience
πŸ’¬ Discuss
βœ… Correct Answer: (C) Hardness

Q. Cast iron has

  • (A) High ductility
  • (B) High malleability
  • (C) Very high tensile strength
  • (D) Its elastic limit very close to ultimate breaking strength
πŸ’¬ Discuss
βœ… Correct Answer: (D) Its elastic limit very close to ultimate breaking strength

Q. Hardest materials so far found is

  • (A) Diamond
  • (B) Graphite
  • (C) Carborundum
  • (D) Pumice stone
πŸ’¬ Discuss
βœ… Correct Answer: (A) Diamond

Q. Polymerisation reactor used for the production of styrene butadiene rubber (SBR) is made of

  • (A) Cast iron
  • (B) Stainless steel or glass lined vessel
  • (C) Karbate
  • (D) Wrought iron
πŸ’¬ Discuss
βœ… Correct Answer: (B) Stainless steel or glass lined vessel

Q. Polymerisation reactor used in the production of styrene butadiene rubber (SBR) is made of

  • (A) Aluminium
  • (B) High silicon cast iron
  • (C) Stainless steel or glass lined steel
  • (D) Nickel clad steel
πŸ’¬ Discuss
βœ… Correct Answer: (C) Stainless steel or glass lined steel

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