1. . In corrosion the chemical reaction is:
(A) Reduction
(B) Oxidation
(C) Decomposition
(D) Displacement
2. . Which one of the following causes corrosion of Iron:
(A) Oxygen
(B) Hydrogen
(C) Moisture and Oxygen
(D) Strong base
3. . The colour of corrosion product of silver is:
(A) Silver white
(B) Black
(C) Green
(D) Grey
4. . The colour of corrosion product of copper is:
(A) Silver white
(B) Black
(C) Green
(D) Grey
5. . Which one of the following metal does not corrode:
(A) Zinc
(B) Platinum
(C) Sodium
(D) Magnesium
6. . The chemical composition of rust is:
(A) FeO.H2O
(B) Fe(OH)3
(C) Fe2O3.xH2O
(D) Fe(OH)2
7. . Forming, welding, or heat treatment of metal can cause:
(A) Stress corrosion
(B) Uniform corrosion
(C) Pitting corrosion
(D) Dry corrosion
8. . A common corrosion which deteriorates the whole surface of the metal and makes the surface thin is:
(A) Stress corrosion
(B) Erosion corrosion
(C) Pitting corrosion
(D) Uniform corrosion
9. . The corrosion due to the movement of corrosive liquids is:
(A) Stress corrosion
(B) Erosion corrosion
(C) Pitting corrosion
(D) Uniform corrosion
10. . The corrosion of underground pipes, cables etc. is called:
(A) Stress corrosion
(B) Erosion corrosion
(C) Pitting corrosion
(D) Soil corrosion
11. . The corrosion of iron is called:
(A) Rust
(B) Erosion corrosion
(C) Galvanic corrosion
(D) Soil corrosion
12. . The corrosion makes holes which are large in depth is called:
(A) Pitting corrosion
(B) Erosion corrosion
(C) Uniform corrosion
(D) Soil corrosion
13. . Corrosion on the surface of a metal due to direct reaction of atmospheric gases is:
(A) Stress corrosion
(B) Dry or chemical corrosion
(C) Pitting corrosion
(D) Soil corrosion
14. . The organisms causing the greatest corrosion problems are:
(A) Viruses and bacteria
(B) Algae and fungi
(C) Bacteria and fungi
(D) Viruses and fungi
15. . A process in which metal is protected from corrosion by dipping it in molten zinc is called:
(A) Tinning
(B) Cladding
(C) Galvanization
(D) Electroplating
16. . A process in which metal is protected from corrosion by cementing zinc powder is called:
(A) Calorizing
(B) Sherardizing
(C) Galvanization
(D) Chromizing
17. . A process in which the coat metal is deposited on the base metal by passing a direct current is called:
(A) Tinning
(B) Cladding
(C) Galvanization
(D) Electroplating
18. . A cementation with 55% Chromium powder & 45% Alumina for protection from corrosion is called:
(A) Calorizing
(B) Sherardizing
(C) Galvanization
(D) Chromizing
19. . A cementation with Aluminium and Alumina powder for protection from corrosion is called:
(A) Calorizing
(B) Sherardizing
(C) Galvanization
(D) Chromizing
20. . The bonding together of dissimilar metals by pressure is called:
(A) Calorizing
(B) Cladding
(C) Galvanization
(D) Chromizing