Concrete Technology and Design MCQ Solved Paper for SSC JE

1. The following proportion of the ingredients of concrete mix, is not in conformation to arbitrary method of proportioning
A. 1 : 1 : 2
B. 1 : 2 : 4
C. 1 : 3 : 6
D. 1 : 4 : 10
Answer : D

2. Pick up the correct statement from the following:
A. The concrete gains strength due to hydration of cement
B. The concrete does not set at freezing point
C. The strength of concrete increases with its age
D. All the above
Answer : D

3. 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

4. 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

5. 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

6. The approximate value of the ratio between direct tensile strength and flexural strength is
A. 0.33
B. 0.5
C. 0.75
D. 1.0
Answer : B

7. 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

8. The slab is designed as one way if the ratio of long span to short span is
A. Less than 1
B. Between 1 and 1.5
C. Between 1.5 and 2
D. Greater than 2
Answer : D

9. Pick up the correct statement from the following:
A. Insufficient quantity of water makes the concrete mix harsh
B. Insufficient quantity of water makes the concrete unworkable
C. Excess quantity of water makes the concrete segregated
D. All the above
Answer : D

10. After casting, an ordinary cement concrete on drying
A. Expands
B. Mix
C. Shrinks
D. None of these
Answer : C

11. The bulk density of aggregates, depends upon
A. Shape
B. Grading
C. Compaction
D. All the above
Answer : D

12. Higher workability of concrete is required if the structure is
A. Made with cement concrete
B. Thick and reinforced
C. Thin and heavily reinforced
D. Thick and heavily reinforced
Answer : D

13. Sand requiring a high water cement ratio, belongs to
A. Zone I
B. Zone II
C. Zone III
D. Zone IV
Answer : A

14. Workability of concrete is inversely proportional to
A. Time of transit
B. Water-cement ratio
C. The air in the mix
D. Size of aggregate
Answer : A

15. The main reason for providing number of reinforcing bars at a support in a simply supported beam is to resist in that zone
A. Compressive stress
B. Shear stress
C. Bond stress
D. Tensile stress
Answer : C

16. Hydration of cement is due to chemical action of water with
A. Tricalcium silicate and dicalcium silicate
B. Dicalcium silicate and tricalcium aluminate
C. Tricalcium aluminate and tricalcium alumino ferrite
D. All the above
Answer : D

17. To determine the modulus of rupture, the size of test specimen used is
A. 150 × 150 × 500 mm
B. 100 × 100 × 700 mm
C. 150 × 150 × 700 mm
D. 100 × 100 × 500 mm
Answer : C

18. Sand generally contains salt if it is obtained from:
A. Nala beds
B. River beds
C. Sea beds
D. None of these
Answer : C

19. Water cement ratio is generally expressed in volume of water required per
A. 10 kg
B. 20 kg
C. 30 kg
D. 50 kg
Answer : D

20. 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

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

22. 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

23. Vicat's apparatus is used for
A. Fineness test
B. Consistency test
C. Setting time test
D. Soundness test
Answer : B

24. The diameter of the Vicat plunger is 10 mm and its length varies from
A. 20 mm to 30 mm
B. 30 mm to 40 mm
C. 40 mm to 50 mm
D. 50 mm to 60 mm
Answer : C

25. 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

26. The cement becomes useless if its absorbed moisture content exceeds
A. 1 %
B. 2 %
C. 3 %
D. 5 %
Answer : D

27. Pick up the incorrect statement from the following:
A. The degree of grinding of cement, is called fineness
B. The process of changing cement paste into hard mass, is known as setting of cement
C. The phenomenon by virtue of which cement does not allow transmission of sound, is known as soundness of cement
D. The heat generated during chemical reaction of cement with water, is known as heat of hydration
Answer : C

28. Too wet concrete may cause
A. Weakness of concrete
B. Excessive laitance
C. Segregation
D. All the above
Answer : D

29. The minimum diameter of longitudinal bars in a column is
A. 6 mm
B. 8 mm
C. 12 mm
D. 16 mm
Answer : C

30. Concrete gains strength due to
A. Chemical reaction of cement with sand and coarse aggregates
B. Evaporation of water from concrete
C. Hydration of cement
D. All the above
Answer : C

31. The percentage of voids in cement is approximately
A. 25 %
B. 40 %
C. 60 %
D. 80 %
Answer : B

32. Horizontal construction joints in concrete walls are generally provided at
A. Soffit level
B. Window sill level
C. Floor level
D. All the above
Answer : D

33. Pick up the correct statement from the following:
A. Sand obtained from pits, is washed to remove clay and silt
B. Sand obtained from flooded pits, need not be washed before use
C. The chloride in sea shore sand and shingle may cause corrosion of reinforcement if the concrete is porous
D. All the above
Answer : D

34. Log Angles machine is used to test the aggregate for
A. Crushing strength
B. Impact value
C. Abrasion resistance
D. Water absorption
Answer : C

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

36. Non-uniform compaction may cause the concrete
A. Porous
B. Non-homogeneous
C. Reduced strength
D. All the above
Answer : D

37. Pozzolanic properties exist in
A. Shales
B. Fly ash
C. Pumicite
D. All the above
Answer : D

38. A higher modular ratio shows
A. Higher compressive strength of concrete
B. Lower compressive strength of concrete
C. Higher tensile strength of steel
D. Lower tensile strength of steel
Answer : B

39. 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

40. The individual variation between test strength of sample should not be more than
A. ± 5 % of average
B. ± 10 % of average
C. ± 15 % of average
D. ± 20 % of average
Answer : C

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

42. High temperature
A. Increases the strength of concrete
B. Decreases the strength of concrete
C. Has no effect on the strength of concrete
D. None of these
Answer : B

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

44. Select the correct statement
A. Elastic modulus of high tensile steel is nearly the same as that of mild steel
B. Elastic modulus of high tensile steel is more than that of mild steel
C. Carbon percentage in high carbon steel is less than that in mild steel
D. High tensile steel is cheaper than mild steel
Answer : A

45. Bulking of sand is
A. Mixing of different sizes of sand particles
B. Mixing of lime with sand
C. Maximum water with sand
D. Swelling of sand when wetted
Answer : D

46. 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 : 1 ½ : 3
C. 1 : 2 : 4
D. 1 : 1 : 2
Answer : C

47. 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 : C

48. If fineness modulus of sand is 2.5, it is graded as
A. Very fine sand
B. Fine sand
C. Medium sand
D. Coarse sand
Answer : B

49. Increase in the moisture content in concrete
A. Reduces the strength
B. Increases the strength
C. Does not change the strength
D. All of the above
Answer : A

50. 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