Materials and Construction MCQs with answers Page - 4

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Q. Concentrated HCl at 30°C can be stored in a vessel made of

  • (A) Cast iron and aluminium
  • (B) Stainless steel and high silicon cast iron
  • (C) PTFE and porcelain
  • (D) None of these

A

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Q. Brine (15% concentration) can be stored in a vessel made of

  • (A) Cast iron
  • (B) Monel
  • (C) Karbate
  • (D) None of these

A

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Q. A bearing metal should not have

  • (A) Enough plasticity
  • (B) Low thermal conductivity
  • (C) Low co-efficient of friction
  • (D) High toughness

A

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Q. White cast iron as compared to grey cast iron is

  • (A) More durable
  • (B) Very brittle
  • (C) Very hard
  • (D) All of the above

A

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Q. Lead pipes are not safe for carrying drinking water because water containing dissolved oxygen attacks lead thereby forming poisonous Pb(OH)2. Lead pipes are readily corroded by

  • (A) Dilute HCI
  • (B) Acetic acid
  • (C) Concentrated H2SO4
  • (D) None of these

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Q. To improve the machinability of steel by its softening, it is subjected to

  • (A) Cold working
  • (B) Annealing
  • (C) Shot blasting
  • (D) Heating

A

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Q. Which of the following is the most widely used insulating material for steam carray-ing pipelines?

  • (A) Ceramic fibre blanket
  • (B) Vermiculite
  • (C) Slag wool
  • (D) Glass wool and 85% magnesia

A

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Q. 18/8 stainless steel means, that it contains

  • (A) 18% chromium and 8% nickel
  • (B) 18% chromium and 8% molybdenum
  • (C) 18% nickel and 8% chromium
  • (D) 18% molybdenum and 8% chromium

A

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Q. Which of the following is produced by condensation polymerisation?

  • (A) Bakelite
  • (B) Polythene
  • (C) Poly vinyl chloride
  • (D) Polystyrene

A

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Q. Presence of even very minute amount (say 0.1%) of __________ in copper, reduces its electrical conductivity very seriously.

  • (A) Bismuth
  • (B) Arsenic
  • (C) Antimony
  • (D) Both B and C

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