Design of Concrete Structures MCQ Practice Test - Set 11 - ObjectiveBooks

Design of Concrete Structures MCQ Practice Test - Set 11

Practice Test: Question Set - 11

1. 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

2. Pick up the correct statement from the following:
    (A) An increase in water content must be accompanied by an increase in cement content
    (B) Angular and rough aggregates reduce the workability of the concrete
    (C) The slump of the concrete mix decreases due to an increase in temperature
    (D) All the above

3. In the method of voids for determination of the quantity of cement paste, it is assumed that
    (A) Voids in coarse aggregates are filled by fine aggregates
    (B) Voids in fine aggregates are filled by the cement paste
    (C) Volume of fine aggregates is equal to total voids in coarse aggregates plus 10% extra
    (D) All the above

4. As compared to ordinary Portland cement, use of pozzolana cement
    (A) Reduces workability
    (B) Increases bleeding
    (C) Increases shrinkage
    (D) Increases strength

5. 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

6. The strength and quality of concrete, depend upon:
    (A) Grading of aggregates
    (B) Surface area of aggregates
    (C) Shape of aggregates
    (D) All the above

7. The factor of safety for
    (A) Steel and concrete are same
    (B) Steel is lower than that for concrete
    (C) Steel is higher than that for concrete
    (D) None of the above

8. The preliminary test is repeated if the difference of compressive strength of three test specimens, exceeds
    (A) 5 kg/cm2
    (B) 8 kg/cm2
    (C) 10 kg/cm2
    (D) 15 kg/cm2

9. Setting time of cement increases by adding
    (A) Gypsum
    (B) Hydrogen peroxide
    (C) Calcium chloride
    (D) Sodium oxide

10. According to IS: 4561978, the maximum reinforcement in a column is
    (A) 2 %
    (B) 4 %
    (C) 6 %
    (D) 8 %

11. According to the recommendations of IS : 456-1978, the expansion joints
    (A) Are provided where plane changes abruptly
    (B) Are provided to ensure minimum resistance
    (C) Do not carry reinforcement across them
    (D) All the above

12. The impurity of mixing water which affects the setting time and strength of concrete, is
    (A) Sodium sulphates
    (B) Sodium chlorides
    (C) Sodium carbonates and bicarbonates
    (D) Calcium bicarbonates

13. If the size of panel in a flat slab is 6 m × 6 m, then as per Indian Standard Code, the widths of column strip and middle strip are
    (A) 3.0 m and 1.5 m
    (B) 1.5 m and 3.0 m
    (C) 3.0 m and 3.0 m
    (D) 1.5 m and 1.5 m

14. Pick up the incorrect statement from the following:
    (A) The bottom and top ends of slump mould are parallel to each other
    (B) The axis of the mould is perpendicular to the end faces
    (C) The internal surface of the mould is kept clean and free from set cement
    (D) The mould is in the form of a frustum of hexagonal pyramid

15. The concrete mix which causes difficulty in obtaining a smooth finish, possess
    (A) Segregation
    (B) Internal friction
    (C) Hardness
    (D) Bleeding

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