1000+ Concrete Technology and Design Multiple Choice Question Answer [Solved]

1. You are asked to construct a massive dam, the type of cement you will use, is
A. Ordinary Portland cement
B. Rapid hardening cement
C. Low heat cement
D. Blast furnace slag cement
Answer : C

2. 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

3. Vicat apparatus is used for
A. Fineness test
B. Consistency test
C. Test for setting time
D. Test for tensile strength
Answer : B

4. The relation between modulus of rupture f_cr, splitting strength f_cs and direct tensile strength f_cl is given by
A. f_cr - f_cs = f_cl
B. f_cr > f_cs > f_cl
C. f_cr < f_cs < f_cl
D. f_cs > f_cr > f_cl
Answer : B

5. The mixture of different ingredients of cement, is burnt at
A. 1000°C
B. 1200°C
C. 1400°C
D. 1600°C
Answer : C

6. Shrinkage of concrete depends upon
(i) Humidity of atmosphere
(ii) Passage of time
(iii) Stress The correct answer is
A. (i) and (ii)
B. (ii) and (iii)
C. Only (iii)
D. All (i), (ii) and (iii)
Answer : A

7. Slump test of concrete is a measure of its
A. Consistency
B. Compressive strength
C. Tensile strength
D. Impact value
Answer : A

8. 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

9. Which of the following has high tensile strength?
A. Plain hot rolled wires
B. Cold drawn wires
C. Heat treated rolled wires
D. All have same tensile strength
Answer : B

10. Diagonal tension in a beam
A. Is maximum at neutral axis
B. Decreases below the neutral axis and increases above the neutral axis
C. Increases below the neutral axis and decreases above the neutral axis
D. Remains same
Answer : C

11. The aggregate impact value of the aggregate used in
A. Building concrete is less than 45
B. Road pavement concrete is less than 30
C. Runway concrete is less than 30
D. All the above
Answer : D

12. The high strength of rapid hardening cement at early stage, is due to its
A. Finer grinding
B. Burning at high temperature
C. Increased lime cement
D. Higher content of tricalcium
Answer : C

13. 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

14. For the construction of thin R.C.C. structures, the type of cement to be avoided, is
A. Ordinary Portland cement
B. Rapid hardening cement
C. Low heat cement
D. Blast furnace slag cement
Answer : D

15. 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

16. Batching error means inaccuracy in the quantity of
A. Aggregates
B. Cement
C. Water
D. All the above
Answer : D

17. To ensure constant moisture content in aggregates
A. Area of each aggregate pile should be large
B. Height of each aggregate pile should not exceed 1.50 m
C. Aggregate pile should be left for 24 hours before aggregates are used
D. All the above
Answer : D

18. 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

19. 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

20. The main object of compaction of concrete, is:
A. To eliminate air holes
B. To achieve maximum density
C. To provide intimate contact between the concrete and embedded materials
D. All the above
Answer : D

21. For road pavements, the cement generally used, is
A. Ordinary Portland cement
B. Rapid hardening cement
C. Low heat cement
D. Blast furnace slag cement
Answer : B

22. A concrete having a slump of 6.5 cm, is said to be
A. Dry
B. Earth moist
C. Semi-plastic
D. Plastic
Answer : D

23. The main reinforcement in the heel of a T-shaped R.C. retaining wall is provided on
A. Top face perpendicular to wall
B. Bottom face perpendicular to wall
C. Both top and bottom faces perpendicular to wall
D. None of the above
Answer : A

24. W_p and W_f are the weights of a cylinder containing partially compacted and fully compacted concrete. If the compaction factor (W_p/W_f) is 0.95, the workability of concrete is
A. Extremely low
B. Very low
C. Low
D. High
Answer : D

25. 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

26. 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 : 1 ½ : 3
D. 1 : 1 : 2
Answer : C

27. Pick up the correct statement from the following:
A. The maximum size of a coarse aggregate, is 75 mm and minimum 4.75 mm
B. The maximum size of the fine aggregate, is 4.75 mm and minimum 0.075 mm
C. The material having particles of size varying from 0.06 mm to 0.002 mm, is known as silt
D. All the above
Answer : D

28. Pick up the incorrect statement from the following:
A. Tricalcium silicate (C3S) hydrates rapidly
B. Tricalcium silicate (C3S) generates more heat of hydration
C. Tricalcium silicate (C3S) develops early strength
D. Tricalcium silicate (C3S) has more resistance to sulphate attack
Answer : D

29. For construction of structures in sea water, the cement generally preferred to, is
A. Portland-pozzolana cement
B. Quick setting cement
C. Low heat Portland cement
D. Rapid hardening cement
Answer : A

30. Admixtures which cause early setting and hardening of concrete are called
A. Workability admixtures
B. Accelerators
C. Retarders
D. Air entraining agents
Answer : B

31. Cement used for normal concrete construction, is obtained by burning a mixture of
A. Siliceous and argillaceous materials
B. Argillaceous and calcareous materials
C. Siliceous and calcareous materials
D. Siliceous, argillaceous and calcareous materials
Answer : D

32. An aggregate is known as cyclopean aggregate if its size is more than
A. 4.75 mm
B. 30 mm
C. 60 mm
D. 75 mm
Answer : D

33. 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

34. For compacting plain concrete road surface of thickness less than 20 cm, we use
A. Internal vibrator
B. Screed vibrator
C. Form vibrator
D. None of these
Answer : B

35. Workability improved by adding
A. Fly ash
B. Hydrated lime
C. Calcium chloride
D. All the above
Answer : D

36. Inert material of a cement concrete mix, is
A. Water
B. Cement
C. Aggregate
D. None of these
Answer : C

37. Curing a concrete for long period ensures better
A. Volume stability
B. Strength
C. Water resistance
D. All the above
Answer : D

38. The depth of footing for an isolated column is governed by (i) Maximum bending moment (ii) Shear force (iii) Punching shear The correct answer is
A. Only (i)
B. (i) and (ii)
C. (i) and (iii)
D. All (i), (ii) and (iii)
Answer : D

39. Pick up the correct statement from the following:
A. The quality of water governs the strength of concrete
B. 10% excess of water reduces the strength of concrete by 15%
C. 30% excess of water reduces the strength of concrete by 50%
D. All the above
Answer : D

40. 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

41. Water cement ratio is
A. Volume of water to that of cement
B. Weight of water to that of cement
C. Weight of concrete to that of water
D. Both (a) and (b) of the above
Answer : D

42. The process of hardening the concrete by keeping its surface moist is known
A. Placing
B. Wetting
C. Curing
D. Compacting
Answer : C

43. 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

44. 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

45. The dimensions of a 35 litre forma for measuring aggregates by volume, are:
A. Length 30 cm, breadth 25 cm, height 30 cm
B. Length 39 cm, breadth 25 cm, height 32 cm
C. Length 27 cm, breadth 27 cm, height 48 cm
D. Length 220 cm, breadth 25 cm, height 40 cm
Answer : C

46. If the foundations of all the columns of a structure are designed on the total live and dead load basis, then
A. There will be no settlement of columns
B. There will be no differential settlement
C. The settlement of exterior columns will be more than interior columns
D. The settlement of interior columns will be more than exterior columns
Answer : C

47. For concreting of heavily reinforced sections without vibration, the workability of concrete expressed as compacting factor should be
A. 0.75 - 0.80
B. 0.80 - 0.85
C. 0.85 - 0.92
D. Above 0.92
Answer : D

48. The light weight aggregates are obtained from
A. Sedimentary rocks
B. Metamorphic rocks
C. Igneous rocks
D. Volcanic source
Answer : D

49. Approximate value of shrinkage strain in concrete, is
A. 0.003
B. 0.0003
C. 0.00003
D. 0.03
Answer : B

50. The minimum percentage of chemical ingredient of cement is that of
A. Magnesium oxide
B. Iron oxide
C. Alumina
D. Lime
Answer : A