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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