251.What is an electrochemical oxidation of metal in reaction with oxygen or sulphates?
(a)Corrosion
(b)Metal dust
(c)Termites
(d)Algae
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252.What happened when acidic substances come in contact with a metal?
(a)Termites
(b)Corrosion
(c)Moss
(d)Fungi
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253.What is the growth of crack formation in a corrosion environment called?
(a)General
(b)Pitting
(c)Galvanic
(d)Stress
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254.Which corrosion appears to form automatically due to atmospheric humidity?
(a)Stress
(b)Galvanic
(c)General
(d)Pitting
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255.Which type of corrosion creates small holes on metal surface?
(a)Galvanic
(b)Pitting
(c)Stress
(d)General
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256.Which corrosion occurs when atoms on the same metal surface are oxidized, damaging the entire surface?
(a)Cracking
(b)Galvanic
(c)Atmospheric
(d)Stress
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257.What is electrochemical reaction that appears in several form in metal?
(a)Termites
(b)Fungi
(c)Algae
(d)Corrosion
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258.What is the process of coating the metal with thin layer of zinc?
(a)Tinning
(b)Sherardising
(c)Blackening
(d)Galvanizing
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259.What is an ideal process for small metal parts that require coating of inner surface?
(a)Anodizing
(b)Galvanizing
(c)Sherardising
(d)Powder coating
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260.Which passivating process used in steel to protect from rust?
(a)Galvanizing
(b)Bluing
(c)Blackening
(d)Anodizing
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261.Which electrochemical process converts the metal into a decorative durable substance?
(a)Brush painting
(b)Anodizing
(c)Bluing
(d)Blackening
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262.Which process of tiny coating on iron sheet with tin?
(a)Galvanizing
(b)Blackodising
(c)Tinning
(d)Bluing
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263.Which is coated to prevent iron from corrosion?
(a)Red oxide primer
(b)Zinc chromate
(c)Cement primer
(d)Lime wash
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264.What is the name of electrolytic coating on metal by another metal?
(a)Painting
(b)Galvanizing
(c)Anodizing
(d)Electroplating
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265.Which process is used to prevent corrosion of Aluminium?
(a)Anodizing
(b)Blackodising
(c)Electroplating
(d)Painting
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266.Which metal has a dull silver finish making it similar in appearance to stainless steel?
(a)Copper
(b)Brass
(c)Mild steel
(d)Aluminium
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267.Which metal is used for decorative arts, jewelry and coins?
(a)Stainless steel and tin
(b)Copper and silver
(c)Wrought iron and cast iron
(d)Zinc and mercury
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268.Which is a shiny and soft metal?
(a)Steel
(b)Brass
(c)Silver
(d)Wrought iron
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269.Which is the strong and hard metal?
(a)Stainless steel
(b)Copper
(c)Silver
(d)Aluminium
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270.Which metal is used for making bars for stay, bolts, engine bolts and rivets?
(a)Stainless steel
(b)Cast iron
(c)Copper
(d)Wrought iron
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