Civil engineer objective questions – Building Materials (Section-3)

246. The insoluble residues in good cement should be

a ) between 4 and 8 %

b ) less than 8 %

c ) between 8 and 10 %

d ) less than 1.5 %

247. During the test of portland cement for ” loss of ignition,” the loss in weight occurs due to

a ) chemical reactions

b ) burning of ingredients

c ) evaporation of moisture and CO₂

d ) melting of tricalcium aluminate

248. The volume of one bag of cement weighing 50 kg is

a ) 0.05m³

b ) 0.0347m²

c ) 0.025m³

d ) 0.04m³

249. Slag cement contains

a ) lime

b ) pozzolona

c ) sulphate

d ) silvicrete

250. If P is the percentage of water required for normal consistency , water to be added for determination of initial setting time is ,

a ) 0.70P

b ) 0.75P

c ) 0.80P

d ) 0.85P

251. A badly mixed cement concrete results in

a ) segregation

b ) bleeding

c ) honey combing

d ) none of the above

252. Strength of cement , with storage

a ) increases

b ) decreases

c ) same

d ) difficult to tell

253. Storage of cement should be done on

a ) brick soling

b ) the ground

c ) wet platform

d ) dry platform

254. The cement mortar mix generally used for masonry work

a ) 1 : 3

b ) 1 : 4

c ) 1 : 5

d ) 1 : 6

255. The cement mortar mix generally used for internal plaster

a ) 1 : 3

b ) 1 : 4

c ) 1 : 5

d ) 1 : 6

256. The cement mortar mix generally used for external plaster

a ) 1 : 3

b ) 1 : 4

c ) 1 : 5

d ) 1 : 6

257. The cement mortar mix generally used for ceiling plaster

a ) 1 : 3

b ) 1 : 4

c ) 1 : 5

d ) 1 : 6

258. During Rana Cracy , types of mortar generally used for public buildings are

a ) cement mortar

b ) mud mortar

c ) dry mortar

d ) lime and surkhi mortar

259. The property of steel enabling it to be drawn into thin wires is called

a ) toughness

b ) hardness

c ) ductility

d ) malleability

260. The Property of metals because of which they can be transformed into different shapes by heating is called

a ) toughness

b ) hardness

c ) ductility

d ) malleability

261. The property due to which steel can withstand hammer blows is called

a ) toughness

b ) hardness

c ) ductility

d ) malleability 

262. The operation of removal of impurities or clay adhering to iron ores is known as

a ) dressing

b ) calcinations

c ) roasting

d ) smelting

263. Pig iron made from haematitite are free from sulphur , phosphurus and copper is known as

a ) bessemer pig

b ) foundry pig

c ) forge pig

d ) melted pig

264. The pig iron obtained from provided with fuel at very high

a ) bessemer pig the furnace that is property temperature is called

b ) foundry pig

c ) forge pig

d ) melted pig

265. The pig iron obtained from the furnace that is property provided with insufficient fuel at very low temperature is called

a ) bessemer pig

b ) foundry pig

c ) forge pig

d ) melted pig

266. The process involved in the manufacture of wrought iron from pig iron is known as

a ) refining

b ) pudding

c ) rolling

d ) all of the above

267. For melting one tonne of cast iron the requirement of material is

a ) 700 m³ of air

b ) 20 kg of lime stone

c ) 100 kg of coke

d ) all of the above

268. Pig iron contains carbon up to

a ) 2 %

b ) 3 %

c ) 4 %

d ) 5 %

269. The property of steel is influenced maximum by

a ) iron

b ) manganese

c ) carbon

d ) sulphur

270. Purest form of iron is

a ) mild steel

b ) cast iron

c ) high carbon steel

d ) wrought iron iron has

271. As compared to mild steel , cast

a ) high compressive strength

b ) low tensile strength

c ) both ( a ) & ( b ) of above

d ) none of the above

272. Wrought iron contains carbon up to

a ) 0.10 %

b ) 0.15 %

c ) 0.20 %

d ) 0.25 %

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