Q.1
Which of the following factors affect the corrosion rate of metal?
  • a) Relative surface area of an anode and cathode
  • b) Nature of the oxide layer
  • c) Purity of metal
  • d) Relative surface area of an anode and cathode, nature of oxide layer and purity of metal
Q.2
The cathodic reaction that occurs during corrosion in oxygenated acidic solution is ______
  • a) 2H++2e–==>H2
  • b) 4H++O2+4e–==>2H2O
  • c) 2H2O+2e–==>H2+2OH–
  • d) 2H2O+O2+4e–==>4OH–
Q.3
If a metal undergoes uniform corrosion it becomes _____
  • a) thinner
  • b) thicker
  • c) perforated
  • d) thicker and perforated
Q.4
Which theory explains the oxidation of metals?
  • a) Collison theory
  • b) Molecular orbital theory
  • c) Wagner’s theory
  • d) Mixed potential theory
Q.5
What is the mechanism of dry corrosion?
  • a) Absorption
  • b) Electrochemical
  • c) Differential solubility
  • d) Both electrochemical and differential solubility
Q.6
Which of the following corrosion contaminant will act as a protective layer?
  • a) AgCl
  • b) SnCl2
  • c) Fe2O3
  • d) CaO
Q.7
Corrosion of iron takes place even in the solid ice.
  • a) True
  • b) False
Q.8
What are the factors that affect corrosion?
  • a) Temperature
  • b) Humidity
  • c) Conductance of the corroding medium
  • d) Temperature, humidity and conductance of the corroding medium
Q.9
_______ is a chemical substance which reduces the corrosion rate.
  • a) Corrosion inhibitor
  • b) Corrosion initiator
  • c) Electrolyte
  • d) Corrosive medium
Q.10
In the given figure, what does point A denote?
  • a) Cathodic spot
  • b) Anodic spot
  • c) Electrolyte
  • d) Oxide layer
Q.11
In the given figure, what does point B denote?
  • a) Cathodic spot
  • b) Anodic spot
  • c) Electrolyte
  • d) Oxide layer
Q.12
In the given figure, what does point C denote?
  • a) Cathodic spot
  • b) Anodic spot
  • c) Electrolyte
  • d) Oxide layer
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