Materials and Construction

171. For storing water and acid free benzol, use a _________ vessel.

1. Steel
2. Karbate
3. Stainless steel
4. None of these

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172. Galvanised iron is

1. Harder
2. Protected from rusting
3. Alumina coated iron
4. None of these

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173. Galvanising (i.e., zinc coating) of steel sheets is done to

1. Prevent its rusting by contact with corrosive atmosphere
2. Protect the base metal by cathodic protection
3. Both (A) & (B)
4. Neither (A) nor (B)

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174. Galvanising is generally done on

1. Non-ferrous metals
2. Low carbon steel
3. Stainless steel
4. Cast iron

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175. Galvanising is not a zinc diffusion process. A zinc diffusion process is termed as

1. Sherardizing
2. Parkerising
3. Anodising
4. None of these

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176. Gas holder of a gobar (cow-dung) gas plant is made of

1. Molybdenum stainless steel
2. Tin
3. Mild steel
4. Aluminium

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177. Generally _________ are subjected to galvanising (i.e., zinc coating).

1. Non-ferrous metals
2. Non-metals
3. Low carbon steels
4. Stainless steel

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178. German silver in an alloy of

1. Copper, nickel and zinc
2. Copper, aluminium and silver
3. Silver, zinc and aluminium
4. Silver, nickel and zinc

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179. German silver is an alloy of copper, nickel and

1. Zinc
2. Silver
3. Tin
4. Lead

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180. German silver used for decorative purposes contains maximum percentage of

1. Silver
2. Copper
3. Zinc
4. Nickel

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