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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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