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

1. 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

2. If a beam fails in bond, then its bond strength can be increased most economically by
A. Increasing the depth of beam
B. Using thinner bars but more in number
C. Using thicker bars but less in number
D. Providing vertical stirrups
Answer : B

3. If 50 kg of fine aggregates and 100 kg of coarse aggregates are mixed in a concrete whose water cement ratio is 0.6, the weight of water required for harsh mix, is
A. 8 kg
B. 10 kg
C. 12 kg
D. 14 kg
Answer : C

4. Pre-stress loss due to friction occurs
A. Only in post-tensioned beams
B. Only in pre-tensioned beams
C. In both post-tensioned and pre-tensioned beams
D. None of the above
Answer : A

5. According to IS: 4561978, minimum slenderness ratio for a short column is
A. Less than 12
B. Less than 18
C. Between 18 and 24
D. More than 24
Answer : A

6. 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

7. How long will it take for the concrete to achieve 100% of its strength?
A. 7 days
B. 14 days
C. 21 days
D. 28 days
Answer : D

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

9. Di-calcium silicate (C₂S)
A. Hydrates rapidly
B. Generates less heat of hydration
C. Hardens rapidly
D. Provides less ultimate strength to cement
Answer : B

10. 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

11. Under normal conditions using an ordinary cement, the period of removal of the form work, is:
A. 7 days for beam soffits
B. 14 days for bottom slabs of spans 4.6 m and more
C. 21 days for bottom beams over 6 m spans
D. All the above
Answer : D

12. The average permissible stress in bond for plain bars in tension is
A. Increased by 10% for bars in compression
B. Increased by 25% for bars in compression
C. Decreased by 10% for bars in compression
D. Decreased by 25% for bars in compression
Answer : B

13. Minimum pitch of transverse reinforcement in a column is
A. The least lateral dimension of the member
B. Sixteen times the smallest diameter of longitudinal reinforcement bar to be tied
C. Forty-eight times the diameter of transverse reinforcement
D. Lesser of the above three values
Answer : D

14. The increased cohesiveness of concrete, makes it
A. Less liable to segregation
B. More liable to segregation
C. More liable to bleeding
D. More liable for surface scaling in frosty weather
Answer : A

15. 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

16. 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 : A

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

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

19. 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

20. The shuttering of a hall measuring 4 m × 5 m, can be removed after
A. 5 days
B. 7 days
C. 10 days
D. 14 days
Answer : B

21. Expansion joints are provided if the length of concrete structures exceeds
A. 10 m
B. 15 m
C. 15 m
D. 45 m
Answer : D

22. 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

23. In slump test, each layer of concrete is compacted by a steel rod 60 cm long and of 16 mm diameter for
A. 20 times
B. 25 times
C. 30 times
D. 50 times
Answer : B

24. Modulus of rupture of concrete is a measure of
A. Flexural tensile strength
B. Direct tensile strength
C. Compressive strength
D. Split tensile strength
Answer : A

25. In symmetrically reinforced sections, shrinkage stresses in concrete and steel are respectively
A. Compressive and tensile
B. Tensile and compressive
C. Both compressive
D. Both tensile
Answer : B

26. Pick up the correct statement from the following:
A. The weight of ingredients of concrete mix, is taken in kilograms
B. Water and aggregates are measured in litres
C. 20 bags of cement make one tonne
D. All the above
Answer : D

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

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

29. The centroid of compressive force, from the extreme compression fiber, in limit state design lies at a distance of (Where x_u is the depth of neutral axis at the limit state of collapse)
A. 0.367 x_u
B. 0.416 x_u
C. 0.446 x_u
D. 0.573 x_u
Answer : B

30. Pick up the correct statement from the following:
A. Segregation is necessary for a workable concrete
B. Consistency does not affect the workability of concrete
C. If the concrete mix is dry, the slump is maximum
D. None of these
Answer : D

31. Cube strength of controlled concrete to be used for pre-tensioned and post-tensioned work respectively should not be less than
A. 35 MPa and 42 MPa
B. 42 MPa and 35 MPa
C. 42 MPa and 53 MPa
D. 53 MPa and 42 MPa
Answer : B

32. If 20 kg of coarse aggregate is sieved through 80 mm, 40 mm, 20 mm, 10 mm, 4.75 mm, 2.36 mm, 1.18 mm, 600 micron, 300 micron and 150 micron standard sieves and the weights retained are 0 kg, 2 kg, 8 kg, 6 kg, 4 kg respectively, the fineness modulus of the aggregate, is
A. 7.30
B. 7.35
C. 7.40
D. 7.45
Answer : C

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

34. 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

35. 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

36. Ratio of permissible stress in direct compression and bending compression is
A. Less than 1
B. Between 1 and 1.5
C. Between 1.5 and 2.0
D. Greater than 2
Answer : A

37. The entrained air in concrete
A. Increases workability
B. Decreases workability
C. Decreases resistance to weathering
D. Increases strength
Answer : A

38. In order to obtain the best workability of concrete, the preferred shape of aggregate is
A. Rounded
B. Elongated
C. Angular
D. All of the above
Answer : A

39. An ideal ware house, is provided
A. Water proof masonry walls
B. Water proof roof
C. Few windows which remain generally closed
D. All the above
Answer : D

40. 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

41. Permissible compressive strength of M 150 concrete grade is
A. 100 kg/cm2
B. 150 kg/cm2
C. 200 kg/cm2
D. 250 kg/cm2
Answer : C

42. An aggregate which passes through 25 mm I.S. sieve and is retained on 20 mm sieve, is said to be flaky if its least dimension is less than
A. 22.5 mm
B. 18.5 mm
C. 16.5 mm
D. 13.5 mm
Answer : D

43. The purpose of reinforcement in pre-stressed concrete is
A. To provide adequate bond stress
B. To resist tensile stresses
C. To impart initial compressive stress in concrete
D. All of the above
Answer : C

44. In pre-stressed concrete
A. Forces of tension and compression change but lever arm remains unchanged
B. Forces of tension and compressions remain unchanged but lever arm changes with the moment
C. Both forces of tension and compression as well as lever arm change
D. Both forces of tension and compression as well as lever arm remain unchanged
Answer : B

45. Due to shrinkage stresses, a simply supported beam having reinforcement only at bottom tends to
A. Deflect downward
B. Deflect upward
C. Deflect downward or upward
D. None of the above
Answer : A

46. If the engineer-in-charge approves, the 10 cm cubes may be used for the work test of concrete provided maximum nominal size of aggregate, does not exceed
A. 10 cm
B. 15 cm
C. 20 cm
D. 25 cm
Answer : C

47. To prevent segregation, the maximum height for placing concrete, is
A. 100 cm
B. 125 cm
C. 150 cm
D. 200 cm
Answer : A

48. In counterfort retaining walls, the main reinforcement in the stem at support is
A. Not provided
B. Provided only on inner face
C. Provided only on front face
D. Provided both on inner and front faces
Answer : B

49. Pick up the correct statement from the following:
A. Sand stones may be divided into calcareous, siliceous and ferruginous sand stones
B. Concrete using sand stones, cracks due to excessive shrinkage
C. Broken bricks produce a concrete having good fire resisting qualities
D. All the above
Answer : D

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