Corrosion MCQs – Chapter 12 DAE

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1. In corrosion the chemical reaction is





2. Which one of the following causes corrosion of Iron





3. The colour of corrosion product of silver is





4. The colour of corrosion product of copper is





5. Which one of the following metal does not corrode





6. The chemical composition of rust is





7. Forming, welding, or heat treatment of metal can cause





8. A common corrosion which deteriorates the whole surface of the metal and makes the surface thin is





9. The corrosion due to the movement of corrosive liquids is





10. The corrosion of underground pipes, cables etc. is called





11. The corrosion of iron is called





12. The corrosion makes holes which are large in depth is called





13. Corrosion on the surface of a metal due to direct reaction of atmospheric gases is





14. The organisms causing the greatest corrosion problems are





15. A process in which metal is protected from corrosion by dipping it in molten zinc is called





16. A process in which metal is protected from corrosion by cementing zinc powder is called





17. A process in which the coat metal is deposited on the base metal by passing a direct current is called





18. A Cementation with 55% Chromium powder & 45% Alumina for protection from corrosion is called





19. A Cementation with Aluminium and Alumina powder for protection from corrosion is called





20. The bonding together of dissimilar metals by pressure is called





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