SSC Stenographer - Concrete Technology and Design 1000+ MCQ [Solved] PDF Download

1. Permissible compressive strength of M 300 concrete grade is
A. 100 kg/cm²
B. 150 kg/cm²
C. 200 kg/cm²
D. 300 kg/cm²
Answer : D

2. While designing the pile as a column, the end conditions are nearly
A. Both ends hinged
B. Both ends fixed
C. One end fixed and other end hinged
D. One end fixed and other end free
Answer : C

3. According to I.S. : 456, the number of grades of concrete mixes, is
A. 3
B. 4
C. 5
D. 7
Answer : D

4. For a concrete mix 1:3:6 and water cement ratio 0.6 both by weight, the quantity of water required per bag, is
A. 10 kg
B. 12 kg
C. 14 kg
D. 16 kg
Answer : C

5. I.S. Sieve Nos. 10 mm and 4.75 mm are generally used for grading of
A. Coarse aggregates
B. Fine aggregates
C. Neither (a) nor (b)
D. Both (a) and (b)
Answer : D

6. The maximum thickness of concrete floor of a cement warehouse, is
A. 10 cm
B. 15 cm
C. 20 cm
D. 25 cm
Answer : D

7. 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

8. 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

9. In the design of a front counterfort in a counterfort retaining wall, the main reinforcement is provided on (i) Bottom face near counterfort (ii) Top face near counterfort (iii) Bottom face near centre of span (iv) Top face near centre of span The correct answer is
A. Only (i)
B. Only (ii)
C. Both (i) and (iv)
D. Both (ii) and (iii)
Answer : C

10. 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

11. An excess of flaky particles in concrete aggregates
A. Decreases the workability
B. Increases the quantity of water and sand
C. More than 15% are not desirable
D. All the above
Answer : D

12. Addition of pozzolana to cement
A. Decreases workability
B. Increases strength
C. Increases heat of hydration
D. None of these
Answer : D

13. Bulking of sand is maximum if moisture content is about
A. 2 %
B. 4 %
C. 6 %
D. 10 %
Answer : B

14. 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

15. In a counterfort retaining wall, the main reinforcement is provided on the (i) Bottom face in front counterfort (ii) Inclined face in front counterfort (iii) Bottom face in back counterfort (iv) Inclined face in back counterfort The correct answer is
A. (i) and (ii),
B. (ii) and (iii)
C. (i) and (iv)
D. (iii) and (iv)
Answer : C

16. Concrete mainly consists of
A. Cement
B. Aggregates
C. Water
D. All the above
Answer : D

17. 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

18. For quality control of Portland cement, the test essentially done is
A. Setting time
B. Tensile strength
C. Consistency
D. All the above
Answer : D

19. 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 : C

20. 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 : B

21. An aggregate is said to be flaky, if its least dimension is less than
A. 2/3 mean dimension
B. 3/4 mean dimension
C. 3/5 mean dimension
D. 5/8 mean dimension
Answer : C

22. The type of aggregates not suitable for high strength concrete and for pavements subjected to tension, is
A. Rounded aggregate
B. Irregular aggregate
C. Angular aggregate
D. Flaky aggregate
Answer : A

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

24. C.R.R.I. charts are used to obtain a relationship between strength of concrete and
A. Water cement ratio
B. Workability
C. Grading of aggregate
D. Fineness modulus
Answer : A

25. For ensuring quality of concrete, use
A. Single sized aggregates
B. Two sized aggregate
C. Graded aggregates
D. Coarse aggregates
Answer : C

26. Allowable shear strength of concrete, depends upon
A. Shear strength
B. Tensile strength
C. Compressive strength
D. None of these
Answer : A

27. During erection, the pile of length l 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 : C

28. The most useless aggregate is one whose surface texture is
A. Smooth
B. Granular
C. Glassy
D. Honey combed and porous
Answer : C

29. If the depth of moist sand in a cylinder is 15 cm and the depth of the sand when fully inundated with water is 12 cm, the bulking of the moist sand, is
A. 10 %
B. 12 %
C. 15 %
D. 25 %
Answer : D

30. Strength of concrete increases with
A. Increase in water-cement ratio
B. Increase in fineness of cement
C. Decrease in curing time
D. Decrease in size of aggregate
Answer : B

31. According to IS : 382-1963, a good aggregate should be
A. Chemically inert
B. Sufficiently strong
C. Hard and durable
D. All the above
Answer : D

32. Which of the following losses of pre-stress occurs only in pretensioning and not in post-tensioning?
A. Elastic shortening of concrete
B. Shrinkage of concrete
C. Creep of concrete
D. Loss due to friction
Answer : A

33. For a simply supported beam of span 15 m, the minimum effective depth to satisfy the vertical deflection limits should be
A. 600 mm
B. 750 mm
C. 900 mm
D. More than 1 m
Answer : B

34. In working stress design, permissible bond stress in the case of deformed bars is more than that in plain bars by
A. 10 %
B. 20 %
C. 30 %
D. 40 %
Answer : D

35. 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 : A

36. 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

37. Pick up the correct statement from the following:
A. A highly absorptive aggregate reduces the workability of concrete considerably
B. The specific gravity of aggregate is important for the determination of the moisture content
C. The absorption and porosity of an aggregate influence the property of the concrete
D. All the above
Answer : D

38. Strength of concrete with passage of time
A. Increases
B. Decreases
C. Fluctuates
D. Remains constant
Answer : A

39. Maximum distance between expansion joints in structures as per IS: 456 1978 is
A. 20 m
B. 30 m
C. 45 m
D. 60 m
Answer : C

40. In T-shaped R C. retaining walls, the main reinforcement in the stem is provided on
A. The front face in one direction
B. The front face in both directions
C. The inner face in one direction
D. The inner face in both directions
Answer : C

41. An aggregate is said to be flaky if its least dimension is less than
A. 1/5th of mean dimension
B. 2/5th of mean dimension
C. 3/5th of mean dimension
D. 4/5th of mean dimension
Answer : C

42. For a longitudinal reinforcing bar in a column, the minimum cover shall neither be less than the diameter of bar nor less than
A. 15 mm
B. 25 mm
C. 30 mm
D. 40 mm
Answer : D

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

44. The grade of concrete M 150 means that compressive strength of a 15 cm cube after 28 days, is
A. 100 kg/cm2
B. 150 kg/cm2
C. 200 kg/cm2
D. 250 kg/cm2
Answer : B

45. Sinking of an intermediate support of a continuousbeam (i) Reduces the negative moment at support (ii) Increases the negative moment at support (iii) Reduces the positive moment at center of span (iv) Increases the positive moment at center of span The correct answer is
A. (i) and (iii)
B. (i) and (iv)
C. (ii) and (iii)
D. (ii) and (iv)
Answer : B

46. Workability of concrete mix with low water cement ratio is determined by
A. Tensile strength test
B. Slump test
C. Compaction factor test
D. Flexural strength test
Answer : C

47. Most common method of pre-stressing used for factory production is
A. Long line method
B. Freyssinet system
C. Magnel-Blaton system
D. Lee-Macall system
Answer : A

48. Addition of pozzolana to cement causes
A. Reduction in permeability
B. Loss of heat of hydration
C. Reduction in bleeding
D. All the above
Answer : D

49. Ordinary concrete is not used for concrete grade
A. M 100
B. M 150
C. M 250
D. M 400
Answer : D

50. When shear stress exceeds the permissible limit in a slab, then it is reduced by
A. Increasing the depth
B. Providing shear reinforcement
C. Using high strength steel
D. Using thinner bars but more in number
Answer : A