Solved MCQs on Corrosion.
To produce ______ coloured hydrated ferric oxide iron undergoes a corrosion process.
(A). Â Red
(B). Â Brown
(C). Â Green
(D). Â Blue
(E). None of these
Multiple Choice Question Answer: Â b
The estimated amount of wasted iron due to the corrosion process is____ of its annual production.
(A). Â 1
(B). Â 1/2
(C). Â 1/4
(D). Â 1/8
(E). None of these
Multiple Choice Question Answer: Â c
______ more energy than the nickel cadmium batteries is the advantage of the nickel-metal hydrated batteries.
(A). Â 100%
(B). Â 50%
(C). Â 75%
(D). Â 25%
(E). None of these
Multiple Choice Question Answer: Â c
Cells are composed of three parts of zinc used as _______in zinc-air cells.
(B). Â Cathode
(C). Â Based on the half cell
(D).  Can’t be said
(E). None of these
Multiple Choice Question Answer: Â a
The zinc-air batteries contains___emf of their anodes.
(A). Â -1V
(B). Â -1.25V
(C). Â 1V
(D). Â 1.25V
(E). None of these
Multiple Choice Question Answer: Â b
The working voltage of the battery is ________ is a drawback of this battery because of the internal losses.
(A). Â Higher
(B). Â Lower
(C). Â Moderate
(D). Â Not considerable
(E). None of these
Multiple Choice Question Answer: Â b
______voltage of electricity is present in nickel metal hydrated batteries which is a low voltage.
(A). Â 1V
(B). Â 1.2V
(C). Â 1.3V
(D). Â 1.4V
(E). None of these
Multiple Choice Question Answer: Â b
Reverse process of __________ is corrosion.
(A). Â Metal extraction
(B). Â Metal production
(C). Â Metal heating
(D). Â Metal moulding
(E). None of these
Multiple Choice Question Answer: Â a
Which one of the following does not lost during corrosion?
(A). Â Malleability
(B). Â Ductility
(C). Â Conductivity
(D). Â Colour
(E). None of these
Multiple Choice Question Answer: Â d
The zinc-air batteries contains___emf of their cathode.
(A). Â 0.1V
(B). Â 0.2V
(C). Â 0.3V
(D). Â 0.4V
(E). None of these
Multiple Choice Question Answer: Â d
Metals are not converted into _____ in corrosion, as a result of decay.
(A). Â Oxides
(B). Â Hydroxides
(C). Â Carbonates
(D). Â Peroxides
(E). None of these
Multiple Choice Question Answer: Â d
The metals exist in nature in the form of their minerals or ores except ____
(A). Â Gold
(B). Â Silver
(C). Â Copper
(D). Â Iron
(E). None of these
Multiple Choice Question Answer: Â a
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