1. sQ1. 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) Moisture and Oxygen
(B) Hydrogen
(C) Oxygen
(D) Strong base
3. . The colour of corrosion product of silver is
(A) Silver white
(B) Grey
(C) Green
(D) Black
4. . The colour of corrosion product of copper is
(A) Silver white
(B) Black
(C) Grey
(D) Green
5. . Which one of the following metal does not corrode
(A) platinum
(B) zinc
(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) pitting corrosion
(B) uniform corrosion
(C) stress 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) uniform corrosion
(D) pitting corrosion
9. . The corrosion due to the movement of corrosive liquids is
(A) stress corrosion
(B) uniform corrosion
(C) pitting corrosion
(D) erosion corrosion
10. . The corrosion of underground pipes, cables etc. is called
(A) stress corrosion
(B) soil corrosion
(C) pitting corrosion
(D) erosion 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) galvanization
(B) cladding
(C) tinning
(D) electroplating
16. . A process in which metal is protected from corrosion by cementing zinc powder is called
(A) calorizing
(B) galvanization
(C) sheradizing
(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) sheradizing
(C) galvanization
(D) chromizing
19. . A Cementation with Aluminium and Alumina powder for protection from corrosion is called
(A) chromizing
(B) sheradizing
(C) galvanization
(D) calorizing
20. . The bonding together of dissimilar metals by pressure is called
(A) calorizing
(B) galvanization
(C) cladding
(D) chromizing