McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .
| 201. |
If the aggregate completely passes through a 50 mm sieve and retained on 40 mm sieve, then the particular aggregate is said to be flaky if its least dimension is less than |
| A. | 27 mm |
| B. | 37 mm |
| C. | 47 mm |
| D. | 57 mm |
| Answer» A. 27 mm | |
| 202. |
Which of the following statement is correct? |
| A. | The maximum size of coarse aggregate should not exceed one-fourth of the minimum dimension of the plain concrete member. |
| B. | the maximum size of coarse aggregate should not exceed one-fifth of the minimum dimension of the reinforced concrete member |
| C. | The aggregates of 40 mm, 20 mm and 10 mm sizes are commonly used for concrete works. |
| D. | all of the above |
| Answer» D. all of the above | |
| 203. |
For highly loaded columns, the concrete mix used is of proportion |
| A. | 1 ; 1 : 2 |
| B. | 1 ; 1.5 : 3 |
| C. | 1 ; 2 : 4 |
| D. | 1 ; 3 : 6 |
| Answer» A. 1 ; 1 : 2 | |
| 204. |
The importance of batching is to obtain |
| A. | strength |
| B. | workability |
| C. | durability |
| D. | all of these |
| Answer» D. all of these | |
| 205. |
Harshness in concrete is due to the excess of |
| A. | water |
| B. | finer particles |
| C. | middle sized particle |
| D. | coarser particles |
| Answer» C. middle sized particle | |
| 206. |
Bulking of sand is |
| A. | compacting of sand |
| B. | segregating sand of particular size |
| C. | increase in volume of sand due to presence of moisture upto certain extent |
| D. | none of the above |
| Answer» C. increase in volume of sand due to presence of moisture upto certain extent | |
| 207. |
If the fineness modulus of sand is 3, then the sand is graded as |
| A. | very fine sand |
| B. | fine sand |
| C. | medium sand |
| D. | coarse sand |
| Answer» D. coarse sand | |
| 208. |
More water should not be added in the concrete mix, as to increase |
| A. | strength |
| B. | durability |
| C. | water-cement ratio |
| D. | all of these |
| Answer» C. water-cement ratio | |
| 209. |
The concrete mix is said to be workable if it has |
| A. | compatibility |
| B. | movability |
| C. | stability |
| D. | all of these |
| Answer» D. all of these | |
| 210. |
The maximum particle size of fine aggregate is |
| A. | 2.5 mm |
| B. | 4.75 mm |
| C. | 5.85 mm |
| D. | 6.5 mm |
| Answer» B. 4.75 mm | |
| 211. |
The size of an aggregate is determined by length gauge. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 212. |
The aggregate is said to be flaky when |
| A. | its least dimension is three-fifth of its mean dimension |
| B. | its least dimension is equal to its mean dimension |
| C. | its length is equal to its mean dimension |
| D. | its length is equal to 1.8 times its mean dimension |
| Answer» A. its least dimension is three-fifth of its mean dimension | |
| 213. |
In designing a ware-house, it is assumed that |
| A. | each bag contains 50 kg of cement |
| B. | floor area occupied by one bag of cement is 0.3 m2 |
| C. | height of each cement bag containing 35 litres of cement is 0.18 m |
| D. | all of the above |
| Answer» D. all of the above | |
| 214. |
The concrete |
| A. | should |
| B. | should not |
| Answer» A. should | |
| 215. |
The strength of concrete using air entraining cement gets reduced by |
| A. | 5 to 10% |
| B. | 10 to 15% |
| C. | 15 to 20% |
| D. | 20 to 25% |
| Answer» B. 10 to 15% | |
| 216. |
A compaction factor of 0.88 indictes that the workability of concrete mix is |
| A. | very low |
| B. | low |
| C. | medium |
| D. | high |
| Answer» C. medium | |
| 217. |
In order to prepare a test specimen, it is necessary to |
| A. | mix the cement and fine aggregate (sand) by dry hand |
| B. | mix the coarse aggregate |
| C. | mix water to the cment, fine aggregate and coarse aggregates |
| D. | all of the above |
| Answer» D. all of the above | |
| 218. |
In the manufacture of possolana cement, the amount of pozzolana material added to ordinary Portland cement clinkers is about |
| A. | 20% |
| B. | 30% |
| C. | 40% |
| D. | 50% |
| Answer» B. 30% | |
| 219. |
The usual proportion of ingredients in plain cement concrete is |
| A. | Portland cement (1 part), clean sand (1 |
| B. | Portland cement (1 part), clean sand (3 to 16 parts) and coarse aggregate (1 |
| C. | Porland cement (1 part), clean sand and coarse aggregate (1 |
| D. | any one of the above |
| Answer» A. Portland cement (1 part), clean sand (1 | |
| 220. |
The arbitrary mix method, the coarse aggregates are taken twice the fine aggregates. |
| A. | True |
| B. | False |
| Answer» A. True | |
| 221. |
At freezing point, the concrete sets easily. |
| A. | Right |
| B. | Wrong |
| Answer» B. Wrong | |
| 222. |
Too much finencess of cement |
| A. | results cracks in concrete |
| B. | generates greater heat |
| C. | develops early strength |
| D. | both (a) and (b) |
| Answer» D. both (a) and (b) | |
| 223. |
In making precast structural units for partition and wall lining purposes, the concrete should be |
| A. | sawdust concrete |
| B. | air-entrained concrete |
| C. | light-weight concrete |
| D. | vacuum concrete |
| Answer» C. light-weight concrete | |
| 224. |
Calcareous material used in the manufacture of cement consists of |
| A. | lime stone |
| B. | chalk |
| C. | shells |
| D. | all of these |
| Answer» D. all of these | |
| 225. |
Los Angeles machine is used to perform the abrasion resistance test of an aggregate. |
| A. | Right |
| B. | Wrong |
| Answer» A. Right | |
| 226. |
The workability of concrete mix increases with the increase in moisture content. |
| A. | Agree |
| B. | Disagree |
| Answer» A. Agree | |
| 227. |
Ordinary Portland cement should not be used for construction work exposed to sulphates in the soil. |
| A. | Agree |
| B. | Disagree |
| Answer» A. Agree | |
| 228. |
According to IS : 269 - 1976, the requirement of an ordinary Portland cement is that |
| A. | the residue does not exceed 10% when sieved through IS sieve No. 9 |
| B. | its expansion is not more than 10 mm for unaerated cement |
| C. | its initial setting time is not less than 30 minutes |
| D. | all of the above |
| Answer» D. all of the above | |
| 229. |
The 'first-in, first-out' rule should eb applied when cement hags are to be removed from the ware-house. |
| A. | True |
| B. | False |
| Answer» A. True | |
| 230. |
The placement of concrete should be discontinued during rainy periods |
| A. | Yes |
| B. | No |
| Answer» A. Yes | |
| 231. |
The mixer, which produces a steady stream of concrete as long as it is in operation, is known as |
| A. | non-tilling batch mixer |
| B. | tilting type batch mixer |
| C. | continuous mixer |
| D. | none of these |
| Answer» C. continuous mixer | |
| 232. |
The cement concrete, from which entrained air and excess water are removed after placing it in position, is called |
| A. | vacuum concrete |
| B. | light weight concrete |
| C. | prestressed concrete |
| D. | sawdust concrete |
| Answer» A. vacuum concrete | |
| 233. |
Which of the following statement is wrong? |
| A. | If the height of pile exceeds 1.44 m, the cement bags should be arranged in header and stretcher fashion. |
| B. | The cement bags should be rolled on the floor when it is taken out for use. |
| C. | The strength of cement decreases with the passage of time. |
| D. | none of the above |
| Answer» D. none of the above | |
| 234. |
In the slump test, the maximum size of the aggregate should not exceed 38 mm. |
| A. | Correct |
| B. | Incorrect |
| Answer» A. Correct | |
| 235. |
Hydration of cement evolves heat. |
| A. | True |
| B. | False |
| Answer» A. True | |
| 236. |
Pezzolana is essentially a silicious material containing clay upto |
| A. | 20% |
| B. | 40% |
| C. | 60% |
| D. | 80% |
| Answer» D. 80% | |
| 237. |
An aggregate is said to be |
| A. | coarse |
| B. | fine |
| C. | cyclopean |
| Answer» C. cyclopean | |
| 238. |
When the sand is fully saturated, its volume is |
| A. | equal to |
| B. | less than |
| C. | more than |
| Answer» A. equal to | |
| 239. |
The resistance of an aggregate to sudden compressive forces is called impact value. |
| A. | Correct |
| B. | Incorrect |
| Answer» A. Correct | |
| 240. |
The controlled concrete is used for |
| A. | one grade of concrete mix |
| B. | three grades of concrete mix |
| C. | five grades of concrete mix |
| D. | all the seven grades of concrete mix |
| Answer» D. all the seven grades of concrete mix | |
| 241. |
The admixtures are added in concrete to |
| A. | accelerate the rate of setting and hardening of cement |
| B. | make the concrete water proof, acid proof etc. |
| C. | reduce the bleeding and segregation of concrete mix |
| D. | all of the above |
| Answer» D. all of the above | |
| 242. |
The aggregate is said to be elongated when |
| A. | its least dimension is three-fifth of its mean dimension |
| B. | its least dimension is equal to its mean dimension |
| C. | its length is equal to its mean dimension |
| D. | its length is equal to 1.8 times its mean dimension |
| Answer» D. its length is equal to 1.8 times its mean dimension | |
| 243. |
The maximum particle size of coarse aggregate is |
| A. | 45 mm |
| B. | 55 mm |
| C. | 65 mm |
| D. | 75 mm |
| Answer» D. 75 mm | |
| 244. |
The cement, widely used in retaining walls, is |
| A. | rapid hardening cement |
| B. | low heat cement |
| C. | sulphate resisting cement |
| D. | ordinary Portland cement |
| Answer» B. low heat cement | |
| 245. |
The presence of tricalcium silicate in cement |
| A. | hydrates the cement rapidly |
| B. | generates less heat of hydration |
| C. | offers high resistance to sulphate attack |
| D. | all of these |
| Answer» A. hydrates the cement rapidly | |
| 246. |
If sea water is used for preparing concrete mix, it |
| A. | reduces strength |
| B. | corrodes steel reinforcement |
| C. | causes efflorescence |
| D. | all of these |
| Answer» D. all of these | |
| 247. |
Which of the following statement is correct? |
| A. | The high early strength is obtained by adding tricalcium silicate in cement. |
| B. | The dicalcium silicate provides good ultimate strength to cement. |
| C. | The tetra calcium alumino ferrite has poor cementing value. |
| D. | all of the above |
| Answer» D. all of the above | |
| 248. |
Vibrated concrete needs |
| A. | less |
| B. | high |
| Answer» A. less | |
| 249. |
Alumina in the cement lowers the clinkering temperature. |
| A. | Agree |
| B. | Disagree |
| Answer» A. Agree | |
| 250. |
The concrete can be lifted by pumps through a maximum vertical distance of |
| A. | 10 m |
| B. | 20 m |
| C. | 30 m |
| D. | 50 m |
| Answer» D. 50 m | |
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