Civil engineer objective questions – Building Materials (Section-4)

273. Mild steel contains carbon upto

 a ) 0.10 %

b ) 0.20 %

c ) 0.25 %

d ) 0.30 %

274. The unit weight of steel in taken as

a ) 7.2 ton /  m³

b ) 7.4 ton / m

c ) 7.6 ton / m³

d ) 7.8 ton / m³

275. Vanadium steel in generally used for

a ) railway switches and crossing

b ) bearing balls

c ) magnets

d ) axles and springs

276. Cast iron is used for

 a ) structural works in beams

b ) small size water pipes

c ) columns and struts

d ) none of the above

277. Mild steel is used for

 a ) structural works in beams

b) Small size water pipe

c) Columns and struts

d) none of the above

278. Wrought iron is used for

a ) structural works in beams

b ) small size water pipes

c ) columns and struts

d ) none of the above

279. The types of steel used for precision leveling staff in

a ) titanium steel

b ) carbon steel

c ) invar

d ) stainless steel

280 The steel used for rails under heavy traffic and sharp curves in

a ) nickel steel

b ) chrome steel

c ) manganese steel

d ) vanadium steel of rails in

281. The steel used for manufacture of rails in

a ) bessemer steel

b ) mild steel

c ) cast steel

d ) stainless steel

282. Softer variety of steel may be obtained by

a ) cementation process

b ) crucible process

c ) bessemer process

d ) open hearth process

283. Brass is an alloy of

a ) copper and zinc

b ) zinc and lead

c ) lead and silver

d ) none of the above

284. Bronze is as alloy of

a ) copper and tin

b ) tin and zinc

c ) zinc and lead

d) lead and silver

285. Invar is an alloy of

a ) copper and nickel

b ) nickel and steel

c ) steel and zinc

d ) zinc and lead

286. Solder is an alloy of

a ) nick el and steel

b ) steel and lead

c ) lead and tin

d ) tin and zinc

287. German silver is an alloy of

a ) zinc , lead and nickel

b ) silver , gold and lead

c ) copper , nickel and zinc

d ) all of the above

288. Monel metal is an alloy of

a ) nickel and copper

b ) copper and zinc

c ) zine and tin

d ) tin and lead

289 , Stainless steel resists corrosion due to

a ) carbon

b ) chromium

c ) sulphur

d ) vanadium

290. For the manufacture of stainless steel , steel is mixed width

a ) chromium

b ) nickel

c ) tungsten

d ) none of the above

291. Galvanizing means

a ) depositing a fine film of zinc on iron / steel by dipping it in molten zinc

b ) depositing a fine film of tin on iron / steel by dipping it in molten tin

c ) depositing a fine film of nickel on iron / steel by dipping it in molten nickel

d ) all of the above

292. A combination of metals with other substances is called

a ) alloy

b ) pig iron

c ) wrought iron

d ) cast iron

293 . The main purpose of manufacture of alloys steel is to attain a certain properties like

a ) strength

b ) hardness

c ) toughness

d ) all of the above

294. The artificial seasoning of timber may

a ) reduce moisture

b ) make light and strong

c ) remove moisture

d ) make fire resistance

295. Which one of the following does not belong to endogenous trees ?

a ) palm

b ) bamboo

c ) teak

d ) cane

296. Which one of the following does not belong to exogenous trees ?

a ) coconut

b ) teak

c ) sisham

d ) sal

297. The solution of salts from the soil absorbed by the trees which becomes a viscous solution due to loss of moisture and action of carbon dioxide is known as

a ) pith

b ) cambium

c ) bark

d ) sap

298. The age of tree can be judged from

a ) the height

b ) the diameter

c ) annual rings

d ) piths

299. The no . of the annual ring in a log of 30 then the life of the timber is

a ) 20 year

b ) 25 year

c ) 30 year

d ) 35 year

300. The layer between the bark of the tree and the sapwood which is not yet converted into wood is called

a ) heartwood

b ) cambium layer

c ) softwood layer

d ) pith

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