On This Page
This set of Concrete Technology and Design Multiple Choice Questions & Answers (MCQs) focuses on Concrete Technology And Design Set 12
Q1 | After casting, an ordinary cement concrete on drying
- expands
- mix
- shrinks
- none of these
Q2 | The most commonly used admixture which prolongs the setting and hardening time is
- gypsum
- calcium chloride
- sodium silicate
- all of the above
Q3 | For given water content, workability decreases if the concrete aggregates contain an excess of
- thin particles
- flat particles
- elongated particles
- all the above
Q4 | The process of proper and accurate measurement of concrete ingredients for uniformity ofproportion, is known
- grading
- curing
- mixing
- batching
Q5 | The load factors for live load and dead load are taken respectively as
- 1.5 and 2.2
- 2.2 and 1.5
- 1.5 and 1.5
- 2.2 and 2.2
Q6 | The mixture of different ingredients of cement, is burnt at
- 1000°c
- 1200°c
- 1400°c
- 1600°c
Q7 | In case of hand mixing of concrete, the extra cement to be added is
- 5 %
- 10 %
- 15 %
- 20 %
Q8 | If 1500 g of water is required to have a cement paste 1875 g of normal consistency, the percentageof water is,
- 20 %
- 25 %
- 30 %
- 35 %
Q9 | The percentage of voids in cement is approximately
- 25 %
- 40 %
- 60 %
- 80 %
Q10 | Water required per bag of cement, is
- 7 kg
- 14 kg
- 21 kg
- 35 kg
Q11 | The recommended value of modular ratio for reinforced brick work is
- 18
- 30
- 40
- 58
Q12 | For an ordinary Portland cement
- residual does not exceed 10% when sieved through is sieve no. 9
- soundness varies from 5 to 10 mm
- initial setting time is not less than 30 minutes
- compressive stress after 7 days, is not less than 175 kg/cm2
Q13 | The ratio of the diameter of reinforcing bars and the slab thickness is
- 1/4
- 1/5
- 1/6
- 1/8
Q14 | Pozzolana cement is used with confidence for construction of
- dams
- massive foundations
- r.c.c. structures
- all the above
Q15 | Pick up the correct statement from the following:
- calcium chloride acts as a retarder
- calcium chloride acts as an accelerator
- gypsum (calcium sulphate) acts as a retarder
- both (b) and (c)
Q16 | The operation of removing humps and hollows of uniform concrete surface, is known as
- floating
- screeding
- trowelling
- finishing
Q17 | 1% of voids in a concrete mix would reduce its strength by about
- 5 %
- 10 %
- 15 %
- 20 %
Q18 | For a continuous slab of 3 m × 3.5 m size, the minimum overall depth of slab to satisfy verticaldeflection limits is
- 50 mm
- 75 mm
- 100 mm
- 120 mm
Q19 | The most useless aggregate is one whose surface texture is
- smooth
- granular
- glassy
- honey combed and porous
Q20 | The shrinkage of concrete
- is proportional to water content is the mix
- is proportional to cement concrete
- increases with age of concrete
- all the above
Q21 | The maximum thickness of concrete floor of a cement warehouse, is
- 10 cm
- 15 cm
- 20 cm
- 25 cm
Q22 | Too wet concrete may cause
- weakness of concrete
- excessive laitance
- segregation
- all the above
Q23 | Maximum percentage reinforcement in case of slabs is limited to
- 2
- 4
- 6
- 8
Q24 | The commonly used material in the manufacture of cement is
- sand stone
- slate
- lime stone
- graphite
Q25 | According to I.S. : 456, the number of grades of concrete mixes, is
- 3
- 4
- 5
- 7