225. Wrought iron is used for
A. structural works in beams
B. small sized water pipes
C. columns and struts
D. none to these.

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226. Cast iron is used for
A. structural works in beams
B. small sized water pipes
C. columns and struts
D. none to these.

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227. Pick up the correct statement from the following :
A. Rust is due to formation of oxides
B. Cast iron oxidises less
C. Steel oxidises most
D. All the above.

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228. Galvanising means covering iron with a thin coat of
A. tin
B. zinc
C. glaze
D. coal tar.

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229. Magnese steels
A. are non-magnetic
B. possess high electrical resistance
C. possess low coefficient of expansion
D. all the above.

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230. For the manufacture of stainless steel, steel is mixed with
A. chromium
B. nickel
C. tungsten
D. none of these.

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231. The yield strength and tensile strength of low carbon steel may be improved by the addition of
A. manganese
B. chromium
C. nickel
D. vanadium

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