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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