Materials and Construction MCQs with answers Page - 6

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A

Admin • 831.35K Points
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Q. Which of the following metals in not used for coating of the base metal to guard it against corrosion?

  • (A) Lead
  • (B) Cadmium
  • (C) Magnesium
  • (D) Aluminium

A

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Q. __________ is a donor impurity for semi-conductors.

  • (A) Boron
  • (B) Antimony
  • (C) Gallium
  • (D) None of these

A

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Q. Hydrochloric acid is stored in a __________ steel vessel.

  • (A) Lead lined
  • (B) Rubber lined
  • (C) Glass lined
  • (D) Stainless

A

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Q. Carbon percentage in medium carbon steel is around

  • (A) 0.1 to 0.35
  • (B) 0.35 to 0.5
  • (C) 0.8 to 1.4
  • (D) 1 to 1.5

A

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Q. Addition of nickel to copper improves its

  • (A) Machinability
  • (B) Ductility
  • (C) Strength
  • (D) Hardness

A

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Q. __________ is not a case hardening process.

  • (A) Carburising
  • (B) Nitriding
  • (C) Cyaniding
  • (D) Annealing

A

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Q. Gunmetal and bronze are not corroded by the action of

  • (A) Wet chlorine
  • (B) Synthetic detergent solution
  • (C) Hydrochloric acid (10%)
  • (D) Nitric acid (< 25%)

A

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Q. Glass lined vessels are not used for handling/storing

  • (A) Dilute H2SO4
  • (B) Dilute HNO3
  • (C) Dilute HCl
  • (D) Hydroflouric acid

A

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Q. Copper is dissolved from its ore by H2SO4 in a percolation tank made of

  • (A) Wood
  • (B) Stainless steel
  • (C) Reinforced concrete lined with lead
  • (D) High silicon iron (14% Si)

A

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Q. Steel will respond to hardening by heat treatment processes, only when the minimum carbon content in it is __________ percent.

  • (A) 0.02
  • (B) 0.2
  • (C) 0.35
  • (D) 0.5

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