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MCQs

Total Questions : 1977 | Page 4 of 198 pages
Question 31. The temperature at which new grains are formed in the metal is called the __________ temperature.
  1.    Eutectic
  2.    Recrystallisation
  3.    Upper critical
  4.    Lower critical
 Discuss Question
Answer: Option B. -> Recrystallisation
Question 32. Plasticisers are added to polymers to improve their
  1.    Tensile strength
  2.    Softness & flexibility
  3.    Acid resistance
  4.    Alkali resistance
 Discuss Question
Answer: Option B. -> Softness & flexibility
Question 33. A material capable of undergoing large permanent deformation, when subjected to compression is termed as
  1.    Malleable
  2.    Ductile
  3.    Brittle
  4.    None of these
 Discuss Question
Answer: Option A. -> Malleable
Question 34. DDT is shipped in
  1.    Stainless steel containers
  2.    Paper bags
  3.    Fibre drums
  4.    Either B or C
 Discuss Question
Answer: Option D. -> Either B or C
Question 35. 'Age hardening' of duralumin is due to
  1.    Copper
  2.    Magnesium
  3.    Both A & B
  4.    Neither A nor B
 Discuss Question
Answer: Option C. -> Both A & B
Question 36. The ability of a material to offer resistance to scratching or indentation is a measure of its
  1.    Brittleness
  2.    Toughness
  3.    Hardness
  4.    Resilience
 Discuss Question
Answer: Option C. -> Hardness
Question 37. Cast iron has
  1.    High ductility
  2.    High malleability
  3.    Very high tensile strength
  4.    Its elastic limit very close to ultimate breaking strength
 Discuss Question
Answer: Option D. -> Its elastic limit very close to ultimate breaking strength
Question 38. Hardest materials so far found is
  1.    Diamond
  2.    Graphite
  3.    Carborundum
  4.    Pumice stone
 Discuss Question
Answer: Option A. -> Diamond
Question 39. Polymerisation reactor used for the production of styrene butadiene rubber (SBR) is made of
  1.    Cast iron
  2.    Stainless steel or glass lined vessel
  3.    Karbate
  4.    Wrought iron
 Discuss Question
Answer: Option B. -> Stainless steel or glass lined vessel
Question 40. Polymerisation reactor used in the production of styrene butadiene rubber (SBR) is made of
  1.    Stainless steel or glass lined steel
  2.    Nickel clad steel
  3.    High silicon cast iron
  4.    Aluminium
 Discuss Question
Answer: Option A. -> Stainless steel or glass lined steel

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