McqMate
| 201. |
Shrinkage in concrete can be reduced by using |
| A. | low water cement ratio |
| B. | less cement in the concrete |
| C. | proper concrete mix |
| D. | all the above |
| Answer» D. all the above | |
| 202. |
The shuttering of a hall measuring 4 m × 5 m, can be removed after |
| A. | 5 days |
| B. | 7 days |
| C. | 10 days |
| D. | 14 days |
| Answer» B. 7 days | |
| 203. |
The approximate value of the ratio between direct tensile strength and flexural strength is |
| A. | 0.33 |
| B. | 0.5 |
| C. | 0.75 |
| D. | 1.0 |
| Answer» B. 0.5 | |
| 204. |
An aggregate is said to be flaky if its least dimension is less than |
| A. | 1/5th of mean dimension |
| B. | 2/5th of mean dimension |
| C. | 3/5th of mean dimension |
| D. | 4/5th of mean dimension |
| Answer» C. 3/5th of mean dimension | |
| 205. |
Workability improved by adding |
| A. | fly ash |
| B. | hydrated lime |
| C. | calcium chloride |
| D. | all the above |
| Answer» D. all the above | |
| 206. |
Workability of concrete is inversely proportional to |
| A. | time of transit |
| B. | water-cement ratio |
| C. | the air in the mix |
| D. | size of aggregate |
| Answer» A. time of transit | |
| 207. |
Inert material of a cement concrete mix, is |
| A. | water |
| B. | cement |
| C. | aggregate |
| D. | none of these |
| Answer» C. aggregate | |
| 208. |
If a beam fails in bond, then its bond strength can be increased most economically by |
| A. | increasing the depth of beam |
| B. | using thinner bars but more in number |
| C. | using thicker bars but less in number |
| D. | providing vertical stirrups |
| Answer» B. using thinner bars but more in number | |
| 209. |
Pick up the incorrect statement from the following: |
| A. | a rich mix of concrete possesses higher strength than that a lean mix of desired workability with excessive quantity of water |
| B. | the strength of concrete decreases as the water cement ratio increases |
| C. | good compaction by mechanical vibrations, increases the strength of concrete |
| D. | none of these |
| Answer» A. a rich mix of concrete possesses higher strength than that a lean mix of desired workability with excessive quantity of water | |
| 210. |
Ordinary Portland cement is manufactured from |
| A. | lime stone and clay |
| B. | gypsum and lime |
| C. | pozzolana |
| D. | lime, pozzolana and clay |
| Answer» B. gypsum and lime | |
| 211. |
The percentage of reinforcement in case of slabs, when high strength deformed bars are used is not less than |
| A. | 0.15 |
| B. | 0.12 |
| C. | 0.30 |
| D. | 1.00 |
| Answer» B. 0.12 | |
| 212. |
Addition of pozzolana to cement |
| A. | decreases workability |
| B. | increases strength |
| C. | increases heat of hydration |
| D. | none of these |
| Answer» D. none of these | |
| 213. |
If 50 kg of fine aggregates and 100 kg of coarse aggregates are mixed in a concrete whose water cement ratio is 0.6, the weight of water required for harsh mix, is |
| A. | 8 kg |
| B. | 10 kg |
| C. | 12 kg |
| D. | 14 kg |
| Answer» C. 12 kg | |
| 214. |
The minimum cover to the ties or spirals should not be less than |
| A. | 15 mm |
| B. | 20 mm |
| C. | 25 mm |
| D. | 50 mm |
| Answer» C. 25 mm | |
| 215. |
According to Water-Cement Ratio Law, the strength of workable plastic concrete |
| A. | depends upon the amount of water used in the mix |
| B. | does not depend upon the quality of cement mixed with aggregates |
| C. | does not depend upon the quantity of cement mixed with aggregates |
| D. | all the above |
| Answer» D. all the above | |
| 216. |
Sands of zone I are: |
| A. | course |
| B. | medium |
| C. | medium to fine |
| D. | fine |
| Answer» A. course | |
| 217. |
According to Whitney's theory, ultimate strain of concrete is assumed to be |
| A. | 0.03 % |
| B. | 0.1 % |
| C. | 0.3 % |
| D. | 3 % |
| Answer» C. 0.3 % | |
| 218. |
The condition not applicable to water cement ratio law, is |
| A. | internal moisture conditions on hydration continue till complete strength is gained |
| B. | concrete specimens may be tested at any temperature |
| C. | concrete specimens need be of same age |
| D. | concrete specimens need be of same size |
| Answer» B. concrete specimens may be tested at any temperature | |
| 219. |
If the slump of a concrete mix is 60 mm, its workability is |
| A. | very low |
| B. | low |
| C. | medium |
| D. | high |
| Answer» C. medium | |
| 220. |
Cube strength of controlled concrete to be used for pre-tensioned and post-tensioned work respectively should not be less than |
| A. | 35 mpa and 42 mpa |
| B. | 42 mpa and 35 mpa |
| C. | 42 mpa and 53 mpa |
| D. | 53 mpa and 42 mpa |
| Answer» B. 42 mpa and 35 mpa | |
| 221. |
The void ratio of |
| A. | single size coarse aggregate is roughly 0.45 |
| B. | graded coarse aggregate is roughly 0.040 |
| C. | fine aggregate is roughly 0.45 |
| D. | all the above |
| Answer» D. all the above | |
| 222. |
According to IS : 382-1963, a good aggregate should be |
| A. | chemically inert |
| B. | sufficiently strong |
| C. | hard and durable |
| D. | all the above |
| Answer» D. all the above | |
| 223. |
The compressive strength of 100 mm cube as compared to 150 mm cube is always |
| A. | less |
| B. | more |
| C. | equal |
| D. | none of the above |
| Answer» B. more | |
| 224. |
The diameter of the Vicat plunger is 10 mm and its length varies from |
| A. | 20 mm to 30 mm |
| B. | 30 mm to 40 mm |
| C. | 40 mm to 50 mm |
| D. | 50 mm to 60 mm |
| Answer» C. 40 mm to 50 mm | |
| 225. |
Gypsum is added for |
| A. | colour |
| B. | strength |
| C. | controlling setting time |
| D. | none of these |
| Answer» C. controlling setting time | |
| 226. |
Modulus of elasticity of steel as per IS: 4561978 shall be taken as |
| A. | 20 kn/cm² |
| B. | 200 kn/cm² |
| C. | 200 kn/mm² |
| D. | 2 × 106 n/cm² |
| Answer» C. 200 kn/mm² | |
| 227. |
The grade of concrete M 150 means that compressive strength of a 15 cm cube after 28 days, is |
| A. | 100 kg/cm2 |
| B. | 150 kg/cm2 |
| C. | 200 kg/cm2 |
| D. | 250 kg/cm2 |
| Answer» B. 150 kg/cm2 | |
| 228. |
The cement becomes useless if its absorbed moisture content exceeds |
| A. | 1 % |
| B. | 2 % |
| C. | 3 % |
| D. | 5 % |
| Answer» D. 5 % | |
| 229. |
In reinforced concrete footing on soil, the minimum thickness at edge should not be less than |
| A. | 100 mm |
| B. | 150 mm |
| C. | 200 mm |
| D. | 250 mm |
| Answer» B. 150 mm | |
| 230. |
For preparing a test-specimen, it is necessary |
| A. | to mix cement and fine aggregate by dry hand |
| B. | to mix coarse aggregates |
| C. | to mix water to the cement, fine aggregates and coarse aggregates |
| D. | all the above |
| Answer» D. all the above | |
| 231. |
For a good concrete |
| A. | aggregates should be hard and durable |
| B. | water should be free from organic materials |
| C. | cement should be sufficient to produce the required strength |
| D. | all the above |
| Answer» D. all the above | |
| 232. |
The process of hardening the concrete by keeping its surface moist is known |
| A. | placing |
| B. | wetting |
| C. | curing |
| D. | compacting |
| Answer» C. curing | |
| 233. |
For the construction of the retaining structures, the type of concrete mix to be used, is |
| A. | 1 : 3 : 6 |
| B. | 1 : 2 : 4 |
| C. | 1 : 1½ : 3 |
| D. | 1 : 4 : 8 |
| Answer» C. 1 : 1½ : 3 | |
| 234. |
The produce impermeable concrete |
| A. | thorough mixing of concrete is required |
| B. | proper compaction of concrete is required |
| C. | proper curing of concrete is required |
| D. | all the above |
| Answer» D. all the above | |
| 235. |
Pozzolanic properties exist in |
| A. | shales |
| B. | fly ash |
| C. | pumicite |
| D. | all the above |
| Answer» D. all the above | |
| 236. |
A continuous beam is deemed to be a deep beam when the ratio of effective span to overall depth (1/D) is less than |
| A. | 1.5 |
| B. | 2.0 |
| C. | 2.5 |
| D. | 3.0 |
| Answer» C. 2.5 | |
| 237. |
Pick up the correct statement from the following: |
| A. | the weight of ingredients of concrete mix, is taken in kilograms |
| B. | water and aggregates are measured in litres |
| C. | 20 bags of cement make one tonne |
| D. | all the above |
| Answer» D. all the above | |
| 238. |
If fineness modulus of sand is 2.5, it is graded as |
| A. | very fine sand |
| B. | fine sand |
| C. | medium sand |
| D. | coarse sand |
| Answer» B. fine sand | |
| 239. |
Maximum quantity of water needed per 50 kg of cement for M 15 grade of concrete is |
| A. | 28 liters |
| B. | 30 liters |
| C. | 32 liters |
| D. | 34 liters |
| Answer» C. 32 liters | |
| 240. |
The increased cohesiveness of concrete, makes it |
| A. | less liable to segregation |
| B. | more liable to segregation |
| C. | more liable to bleeding |
| D. | more liable for surface scaling in frosty weather |
| Answer» A. less liable to segregation | |
| 241. |
Concrete is unsuitable for compaction by a vibrator if it is |
| A. | dry |
| B. | earth moist |
| C. | semi-plastic |
| D. | plastic |
| Answer» D. plastic | |
| 242. |
In order to obtain the best workability of concrete, the preferred shape of aggregate is |
| A. | rounded |
| B. | elongated |
| C. | angular |
| D. | all of the above |
| Answer» A. rounded | |
| 243. |
Hydration of cement is due to chemical action of water with |
| A. | tricalcium silicate and dicalcium silicate |
| B. | dicalcium silicate and tricalcium aluminate |
| C. | tricalcium aluminate and tricalcium alumino ferrite |
| D. | all the above |
| Answer» D. all the above | |
| 244. |
An aggregate which passes through 25 mm I.S. sieve and is retained on 20 mm sieve, is said to be flaky if its least dimension is less than |
| A. | 22.5 mm |
| B. | 18.5 mm |
| C. | 16.5 mm |
| D. | 13.5 mm |
| Answer» D. 13.5 mm | |
| 245. |
Approximate value of shrinkage strain in concrete, is |
| A. | 0.003 |
| B. | 0.0003 |
| C. | 0.00003 |
| D. | 0.03 |
| Answer» B. 0.0003 | |
| 246. |
For quality control of Portland cement, the test essentially done is |
| A. | setting time |
| B. | tensile strength |
| C. | consistency |
| D. | all the above |
| Answer» D. all the above | |
| 247. |
Strength of concrete with passage of time |
| A. | increases |
| B. | decreases |
| C. | fluctuates |
| D. | remains constant |
| Answer» A. increases | |
| 248. |
Which of the following statements is incorrect? |
| A. | higher vee-bee time shows lower workability |
| B. | higher slump shows higher workability |
| C. | higher compacting factor shows higher workability |
| D. | none of the above |
| Answer» D. none of the above | |
| 249. |
To obtain cement dry powder, lime stones and shales or their slurry, is burnt in a rotary kiln at a temperature between |
| A. | 1100° and 1200°c |
| B. | 1200° and 1300°c |
| C. | 1300° and 1400°c |
| D. | 1400° and 1500°c |
| Answer» D. 1400° and 1500°c | |
| 250. |
In a pile of length , the points of suspension from ends for lifting it are located at |
| A. | 0.207 l |
| B. | 0.25 l |
| C. | 0.293 l |
| D. | 0.333 l |
| Answer» A. 0.207 l | |
| 251. |
Curing a concrete for long period ensures better |
| A. | volume stability |
| B. | strength |
| C. | water resistance |
| D. | all the above |
| Answer» D. all the above | |
| 252. |
Batching error means inaccuracy in the quantity of |
| A. | aggregates |
| B. | cement |
| C. | water |
| D. | all the above |
| Answer» D. all the above | |
| 253. |
If the storey height is equal to length of RCC wall, the percentage increase in strength is |
| A. | 0 |
| B. | 10 |
| C. | 20 |
| D. | 30 |
| Answer» B. 10 | |
| 254. |
If X, Y and Z are the fineness modulli of coarse, fine and combined aggregates, the percentage (P) of fine aggregates to combined aggregates, is |
| A. | p = [(z - x)/(z - y)] × 100 |
| B. | p = [(x - z)/(z - y)] × 100 |
| C. | p = [(x - z)/(z + y)] × 100 |
| D. | p = [(z + x)/(z - y)] × 100 |
| Answer» B. p = [(x - z)/(z - y)] × 100 | |
| 255. |
If the depth of actual neutral axis in a beam is more than the depth of critical neutral axis, then the beam is called |
| A. | balanced beam |
| B. | under-reinforced beam |
| C. | over-reinforced beam |
| D. | none of the above |
| Answer» C. over-reinforced beam | |
| 256. |
Proper proportioning of concrete, ensures |
| A. | desired strength and workability |
| B. | desired durability |
| C. | water tightness of the structure |
| D. | all the above |
| Answer» D. all the above | |
| 257. |
The relation between modulus of rupture fcr, splitting strength fcs and direct tensile strength fcl is given by |
| A. | fcr - fcs = fcl |
| B. | fcr > fcs > fcl |
| C. | fcr < fcs < fcl |
| D. | fcs > fcr > fcl |
| Answer» B. fcr > fcs > fcl | |
| 258. |
Air entrainment in the concrete increases |
| A. | workability |
| B. | strength |
| C. | the effects of temperature variations |
| D. | the unit weight |
| Answer» A. workability | |
| 259. |
Construction joints are provided |
| A. | where b.m. and s.f. are small |
| B. | where the member is supported by other member |
| C. | at 18 m apart in huge structures |
| D. | all the above |
| Answer» D. all the above | |
| 260. |
Maximum distance between expansion joints in structures as per IS: 456 1978 is |
| A. | 20 m |
| B. | 30 m |
| C. | 45 m |
| D. | 60 m |
| Answer» C. 45 m | |
| 261. |
Ordinary concrete is not used for concrete grade |
| A. | m 100 |
| B. | m 150 |
| C. | m 250 |
| D. | m 400 |
| Answer» D. m 400 | |
| 262. |
In a spherical dome subjected to concentrated load at crown or uniformly distributed load, the meridional force is always |
| A. | zero |
| B. | tensile |
| C. | compressive |
| D. | tensile or compressive |
| Answer» C. compressive | |
| 263. |
An aggregate is said to be flaky, if its least dimension is less than |
| A. | 2/3 mean dimension |
| B. | 3/4 mean dimension |
| C. | 3/5 mean dimension |
| D. | 5/8 mean dimension |
| Answer» C. 3/5 mean dimension | |
| 264. |
While designing an air entrained concrete |
| A. | water cement ratio is reduced |
| B. | proportion of aggregates is reduced |
| C. | an allowance for the entrained air is made |
| D. | all the above |
| Answer» D. all the above | |
| 265. |
Minimum thickness of load bearing RCC wall should be |
| A. | 50 mm |
| B. | 100 mm |
| C. | 150 mm |
| D. | 200 mm |
| Answer» B. 100 mm | |
| 266. |
M 150 grade of concrete approximates |
| A. | 1 : 3 : 6 mix |
| B. | 1 : 1 :2 mix |
| C. | 1 : 2 : 4 mix |
| D. | 1 : 1.5 : 3 mix |
| Answer» B. 1 : 1 :2 mix | |
| 267. |
Permissible compressive strength of M 300 concrete grade is |
| A. | 100 kg/cm2 |
| B. | 150 kg/cm2 |
| C. | 200 kg/cm2 |
| D. | 300 kg/cm2 |
| Answer» D. 300 kg/cm2 | |
| 268. |
Strength of concrete increases with |
| A. | increase in water-cement ratio |
| B. | increase in fineness of cement |
| C. | decrease in curing time |
| D. | decrease in size of aggregate |
| Answer» B. increase in fineness of cement | |
| 269. |
For ensuring quality of concrete, use |
| A. | single sized aggregates |
| B. | two sized aggregate |
| C. | graded aggregates |
| D. | coarse aggregates |
| Answer» C. graded aggregates | |
| 270. |
In working stress design, permissible bond stress in the case of deformed bars is more than that in plain bars by |
| A. | 10 % |
| B. | 20 % |
| C. | 30 % |
| D. | 40 % |
| Answer» D. 40 % | |
| 271. |
Workability improved by adding |
| A. | air-entraining agent |
| B. | foaming agent |
| C. | oily-agent |
| D. | all the above |
| Answer» D. all the above | |
| 272. |
The rock which is not calcareous, is: |
| A. | lime stone |
| B. | chalk |
| C. | laterite |
| D. | none of these |
| Answer» D. none of these | |
| 273. |
A T-shaped retaining wall mainly consists of |
| A. | one cantilever |
| B. | two cantilevers |
| C. | three cantilevers |
| D. | four cantilevers |
| Answer» C. three cantilevers | |
| 274. |
Pick up the correct statement from the following: |
| A. | insufficient quantity of water makes the concrete mix harsh |
| B. | insufficient quantity of water makes the concrete unworkable |
| C. | excess quantity of water makes the concrete segregated |
| D. | all the above |
| Answer» D. all the above | |
| 275. |
The fineness modulus of fine aggregate is in the range of |
| A. | 2.0 to 3.5 |
| B. | 3.5 to 5.0 |
| C. | 5.0 to 7.0 |
| D. | 6.0 to 8.5 |
| Answer» A. 2.0 to 3.5 | |
| 276. |
After casting, an ordinary cement concrete on drying |
| A. | expands |
| B. | mix |
| C. | shrinks |
| D. | none of these |
| Answer» C. shrinks | |
| 277. |
The most commonly used admixture which prolongs the setting and hardening time is |
| A. | gypsum |
| B. | calcium chloride |
| C. | sodium silicate |
| D. | all of the above |
| Answer» A. gypsum | |
| 278. |
For given water content, workability decreases if the concrete aggregates contain an excess of |
| A. | thin particles |
| B. | flat particles |
| C. | elongated particles |
| D. | all the above |
| Answer» D. all the above | |
| 279. |
The process of proper and accurate measurement of concrete ingredients for uniformity of proportion, is known |
| A. | grading |
| B. | curing |
| C. | mixing |
| D. | batching |
| Answer» D. batching | |
| 280. |
The load factors for live load and dead load are taken respectively as |
| A. | 1.5 and 2.2 |
| B. | 2.2 and 1.5 |
| C. | 1.5 and 1.5 |
| D. | 2.2 and 2.2 |
| Answer» B. 2.2 and 1.5 | |
| 281. |
The mixture of different ingredients of cement, is burnt at |
| A. | 1000°c |
| B. | 1200°c |
| C. | 1400°c |
| D. | 1600°c |
| Answer» C. 1400°c | |
| 282. |
In case of hand mixing of concrete, the extra cement to be added is |
| A. | 5 % |
| B. | 10 % |
| C. | 15 % |
| D. | 20 % |
| Answer» B. 10 % | |
| 283. |
If 1500 g of water is required to have a cement paste 1875 g of normal consistency, the percentage of water is, |
| A. | 20 % |
| B. | 25 % |
| C. | 30 % |
| D. | 35 % |
| Answer» B. 25 % | |
| 284. |
The percentage of voids in cement is approximately |
| A. | 25 % |
| B. | 40 % |
| C. | 60 % |
| D. | 80 % |
| Answer» B. 40 % | |
| 285. |
Water required per bag of cement, is |
| A. | 7 kg |
| B. | 14 kg |
| C. | 21 kg |
| D. | 35 kg |
| Answer» D. 35 kg | |
| 286. |
The recommended value of modular ratio for reinforced brick work is |
| A. | 18 |
| B. | 30 |
| C. | 40 |
| D. | 58 |
| Answer» C. 40 | |
| 287. |
For an ordinary Portland cement |
| A. | residual does not exceed 10% when sieved through is sieve no. 9 |
| B. | soundness varies from 5 to 10 mm |
| C. | initial setting time is not less than 30 minutes |
| D. | compressive stress after 7 days, is not less than 175 kg/cm2 |
| Answer» C. initial setting time is not less than 30 minutes | |
| 288. |
The ratio of the diameter of reinforcing bars and the slab thickness is |
| A. | 1/4 |
| B. | 1/5 |
| C. | 1/6 |
| D. | 1/8 |
| Answer» D. 1/8 | |
| 289. |
Pozzolana cement is used with confidence for construction of |
| A. | dams |
| B. | massive foundations |
| C. | r.c.c. structures |
| D. | all the above |
| Answer» D. all the above | |
| 290. |
Pick up the correct statement from the following: |
| A. | calcium chloride acts as a retarder |
| B. | calcium chloride acts as an accelerator |
| C. | gypsum (calcium sulphate) acts as a retarder |
| D. | both (b) and (c) |
| Answer» D. both (b) and (c) | |
| 291. |
The operation of removing humps and hollows of uniform concrete surface, is known as |
| A. | floating |
| B. | screeding |
| C. | trowelling |
| D. | finishing |
| Answer» B. screeding | |
| 292. |
1% of voids in a concrete mix would reduce its strength by about |
| A. | 5 % |
| B. | 10 % |
| C. | 15 % |
| D. | 20 % |
| Answer» A. 5 % | |
| 293. |
For a continuous slab of 3 m × 3.5 m size, the minimum overall depth of slab to satisfy vertical deflection limits is |
| A. | 50 mm |
| B. | 75 mm |
| C. | 100 mm |
| D. | 120 mm |
| Answer» B. 75 mm | |
| 294. |
The most useless aggregate is one whose surface texture is |
| A. | smooth |
| B. | granular |
| C. | glassy |
| D. | honey combed and porous |
| Answer» C. glassy | |
| 295. |
The shrinkage of concrete |
| A. | is proportional to water content is the mix |
| B. | is proportional to cement concrete |
| C. | increases with age of concrete |
| D. | all the above |
| Answer» D. all the above | |
| 296. |
The maximum thickness of concrete floor of a cement warehouse, is |
| A. | 10 cm |
| B. | 15 cm |
| C. | 20 cm |
| D. | 25 cm |
| Answer» D. 25 cm | |
| 297. |
Too wet concrete may cause |
| A. | weakness of concrete |
| B. | excessive laitance |
| C. | segregation |
| D. | all the above |
| Answer» D. all the above | |
| 298. |
Maximum percentage reinforcement in case of slabs is limited to |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» B. 4 | |
| 299. |
The commonly used material in the manufacture of cement is |
| A. | sand stone |
| B. | slate |
| C. | lime stone |
| D. | graphite |
| Answer» C. lime stone | |
| 300. |
According to I.S. : 456, the number of grades of concrete mixes, is |
| A. | 3 |
| B. | 4 |
| C. | 5 |
| D. | 7 |
| Answer» D. 7 | |
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