Concrete Technology objective question and answer

 Concrete Technology objective question and answer part 4

Question No. 311

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: Option A 

Question No. 312

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: Option D 

Question No. 313

During erection, the pile of length is supported by a crane at a distance of 

(A) 0.207 l

(B) 0.293 l

(C) 0.707 l

(D) 0.793 l

From the driving end of pile which rests on the ground 

Answer: Option C 

Question No. 314

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: Option D 

Question No. 315

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: Option B 

Question No. 316

The mixture of different ingredients of cement, is burnt at 

(A) 1000°C

(B) 1200°C 

(C) 1400°C 

(D) 1600°C 

Answer: Option C 

Question No. 317

In case of hand mixing of concrete, the extra cement to be added is 

(A) 5 % 

(B) 10 % 

(C) 15 % 

(D) 20 % 

Answer: Option B 

Question No. 318

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: Option B 

Question No. 319

The percentage of voids in cement is approximately 

(A) 25 % 

(B) 40 % 

(C) 60 % 

(D) 80 % 

Answer: Option B 

Question No. 320

Water required per bag of cement, is 

(A) 7 kg 

(B) 14 kg 

(C) 21 kg 

(D) 35 kg 

Answer: Option D 

Question No. 321

The recommended value of modular ratio for reinforced brick work is 

(A) 18 

(B) 30 

(C) 40 

(D) 58 

Answer: Option C

Question No. 322

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: Option C 

Question No. 323

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: Option D 

Question No. 324

Pozzolana cement is used with confidence for construction of 

(A) Dams 

(B) Massive foundations 

(C) R.C.C. structures 

(D) All the above 

Answer: Option D 

Question No. 325

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: Option D 

Question No. 326

The operation of removing humps and hollows of uniform concrete surface, is known as 

(A) Floating 

(B) Screeding 

(C) Trowelling 

(D) Finishing 

Answer: Option B 

Question No. 327

1% of voids in a concrete mix would reduce its strength by about 

(A) 5 % 

(B) 10 % 

(C) 15 %

(D) 20 % 

Answer: Option A 

Question No. 328

Permissible compressive strength of M 200 concrete grade is 

(A) 100 kg/cm2

(B) 150 kg/cm2

(C) 200 kg/cm2

(D) 250 kg/cm2

Answer: Option C 

Question No. 329

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: Option B 

Question No. 330

The most useless aggregate is one whose surface texture is 

(A) Smooth 

(B) Granular 

(C) Glassy 

(D) Honey combed and porous 

Answer: Option C 

Question No. 331

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: Option D 

Question No. 332

The maximum thickness of concrete floor of a cement warehouse, is 

(A) 10 cm 

(B) 15 cm 

(C) 20 cm 

(D) 25 cm 

Answer: Option D

Question No. 333

Too wet concrete may cause 

(A) Weakness of concrete 

(B) Excessive laitance 

(C) Segregation 

(D) All the above 

Answer: Option D 

Question No. 334

Maximum percentage reinforcement in case of slabs is limited to 

(A) 2 

(B) 4 

(C) 6 

(D) 8 

Answer: Option B 

Question No. 335

The commonly used material in the manufacture of cement is 

(A) Sand stone 

(B) Slate 

(C) Lime stone 

(D) Graphite 

Answer: Option C 

Question No. 336

According to I.S. : 456, the number of grades of concrete mixes, is 

(A) 3 

(B) 4 

(C) 5 

(D) 7 

Answer: Option D 

Question No. 337

Grading of sand causes great variation in 

(A) Workability of concrete 

(B) Strength of concrete 

(C) Durability of concrete 

(D) All the above 

Answer: Option D 

Question No. 338

The percentage of the aggregate of F.M. 2.6 to be combined with coarse aggregate of F.M. 6.8 for 

obtaining the aggregates of F.M. 5.4, is 

(A) 30 % 

(B) 40 %

(C) 50 % 

(D) 60 % 

Answer: Option C 

Question No. 339

The ratio of various ingredients (cement, sand, aggregates) in concrete of grade M 200, is 

(A) 1 : 2 : 4 

(B) 1 : 3 : 6 

(C) 1 : 1½ : 3 

(D) 1 : 1 : 2 

Answer: Option C 

Question No. 340

Joints in concrete structures, are provided 

(A) To reduce the tensile stresses likely to be developed due to evaporation of water 

(B) To minimise the change in the dimensions of the slab 

(C) To minimise the necessary cracking 

(D) All the above 

Answer: Option D 

Question No. 341

For the construction of R.C.C. slabs, columns, beams, walls, etc. the grade of concrete mix used, is 

(A) 1 : 3 : 6 

(B) 1 : 1½ : 3 

(C) 1 : 2 : 4 

(D) 1 : 1 : 2 

Answer: Option C 

Question No. 342

Pick up the correct statement from the following: 

(A) Water enables chemical reaction to take place with cement 

(B) Water lubricates the mixture of gravel, sand and cement 

(C) Strength of concrete structure largely depends upon its workability 

(D) All the above 

Answer: Option D 

Question No. 343

The final operation of finishing floors, is known as 

(A) Screeding 

(B) Floating 

(C) Trowelling 

(D) Finishing 

Answer: Option C

Question No. 344

Transport of concrete by pumps, is done for a distance of 

(A) 100 m 

(B) 200 m 

(C) 300 m 

(D) 400 m 

Answer: Option D 

Question No. 345

Curing 

(A) Reduces the shrinkage of concrete 

(B) Preserves the properties of concrete 

(C) Prevents the loss of water by evaporation 

(D) All of the above 

Answer: Option D 

Question No. 346

The datum temperature for maturity by Plowman, is 

(A) 23°C 

(B) 0° 

(C) - 5.6°C 

(D) - 11.7°C 

Answer: Option D 

Question No. 347

The bulk density of aggregates, is generally expressed as 

(A) tonnes/cubic metre 

(B) kg/cubic metre 

(C) kg/litre 

(D) g/cm3

Answer: Option C 

Question No. 348

For concreting tunnel linings, transportation of concrete is done by 

(A) Pans 

(B) Wheel borrows 

(C) Containers 

(D) Pumps 

Answer: Option D 

Question No. 349

The factor which affects workability, is 

(A) Water content and its temperature 

(B) Shape and size of the aggregates 

(C) Air entraining agents

(D) All the above 

Answer: Option D 

Question No. 350

Proper batching ensures 

(A) Economy 

(B) Durability 

(C) Workability 

(D) All the above 

Answer: Option D 

Question No. 351

The ratio of the length to breadth of a wooden float, is 

(A) 4.5 

(B) 5.5 

(C) 6.5 

(D) 7.5 

Answer: Option D 

Question No. 352

Vicat's apparatus is used for 

(A) Fineness test 

(B) Consistency test 

(C) Setting time test 

(D) Soundness test 

Answer: Option B 

Question No. 353

Percentage of pozzolanic material containing clay upto 80% used for the manufacture of pozzolana 

cement, is 

(A) 30 % 

(B) 40 % 

(C) 50 % 

(D) 60 % 

Answer: Option A 

Question No. 354

The grade of concrete not recommended by I.S. : 456, is 

(A) M 100 

(B) M 200 

(C) M 300 

(D) M 500 

Answer: Option D

Question No. 355

The compaction of concrete, improves 

(A) Density 

(B) Strength 

(C) Durability 

(D) All the above 

Answer: Option D 

Question No. 356

Segregation is responsible for 

(A) Honey-combed concrete 

(B) Porous layers in concrete 

(C) Surface scaling in concrete 

(D) All the above 

Answer: Option D 

Question No. 357

Slump test of concrete is a measure of its 

(A) Consistency 

(B) Compressive strength 

(C) Tensile strength 

(D) Impact value 

Answer: Option A 

Question No. 358

Slump test of concrete is a measure of its 

(A) Consistency 

(B) Compressive strength 

(C) Tensile strength 

(D) Impact value 

Answer: Option A 

Question No. 359

If the effective working time is 7 hours and per batch time of concrete is 3 minutes, the output of a 

concrete mixer of 150 litre capacity, is 

(A) 15,900 litres 

(B) 16,900 litres 

(C) 17,900 litres 

(D) 18,900 litres 

Answer: Option D 

Question No. 360

An ordinary Portland cement when tested for its fineness, should not leave any residue on I.S. 

sieve No. 9, more than 

(A) 5 %

(B) 10 % 

(C) 15 % 

(D) 20 % 

Answer: Option B 

Question No. 361

The top diameter, bottom diameter and the height of a slump mould are: 

(A) 10 cm, 20 cm, 30 cm 

(B) 10 cm, 30 cm, 20 cm 

(C) 20 cm, 10 cm, 30 cm 

(D) 20 cm, 30 cm, 10 cm 

Answer: Option A

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