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This set of Concrete Technology and Design Multiple Choice Questions & Answers (MCQs) focuses on Concrete Technology And Design Set 6
Q1 | Which of the following losses of pre-stress occurs only in pre-tensioning and not in posttensioning?
- elastic shortening of concrete
- shrinkage of concrete
- creep of concrete
- loss due to friction
Q2 | The type of aggregates of same nominal size, which contain less voids when compacted, are
- rounded spherical
- irregular
- flaky
- none of these
Q3 | Pre-stress loss due to friction occurs
- only in post-tensioned beams
- only in pre-tensioned beams
- in both post-tensioned and pre-tensioned beams
- none of the above
Q4 | Pick up the correct statement from the following:
- an increase in water content must be accompanied by an increase in cement content
- angular and rough aggregates reduce the workability of the concrete
- the slump of the concrete mix decreases due to an increase in temperature
- all the above
Q5 | In the method of voids for determination of the quantity of cement paste, it is assumed that
- voids in coarse aggregates are filled by fine aggregates
- voids in fine aggregates are filled by the cement paste
- volume of fine aggregates is equal to total voids in coarse aggregates plus 10% extra
- all the above
Q6 | As compared to ordinary Portland cement, use of pozzolana cement
- reduces workability
- increases bleeding
- increases shrinkage
- increases strength
Q7 | The following proportion of the ingredients of concrete mix, is not in conformation to arbitrarymethod of proportioning
- 1 : 1 : 2
- 1 : 2 : 4
- 1 : 3 : 6
- 1 : 4 : 10
Q8 | The strength and quality of concrete, depend upon:
- grading of aggregates
- surface area of aggregates
- shape of aggregates
- all the above
Q9 | The factor of safety for
- steel and concrete are same
- steel is lower than that for concrete
- steel is higher than that for concrete
- none of the above
Q10 | The preliminary test is repeated if the difference of compressive strength of three test specimens,exceeds
- 5 kg/cm2
- 8 kg/cm2
- 10 kg/cm2
- 15 kg/cm2
Q11 | Setting time of cement increases by adding
- gypsum
- hydrogen peroxide
- calcium chloride
- sodium oxide
Q12 | According to IS: 4561978, the maximum reinforcement in a column is
- 2 %
- 4 %
- 6 %
- 8 %
Q13 | According to the recommendations of IS : 456-1978, the expansion joints
- are provided where plane changes abruptly
- are provided to ensure minimum resistance
- do not carry reinforcement across them
- all the above
Q14 | The impurity of mixing water which affects the setting time and strength of concrete, is
- sodium sulphates
- sodium chlorides
- sodium carbonates and bicarbonates
- calcium bicarbonates
Q15 | If the size of panel in a flat slab is 6 m × 6 m, then as per Indian Standard Code, the widths ofcolumn strip and middle strip are
- 3.0 m and 1.5 m
- 1.5 m and 3.0 m
- 3.0 m and 3.0 m
- 1.5 m and 1.5 m
Q16 | Pick up the incorrect statement from the following:
- the bottom and top ends of slump mould are parallel to each other
- the axis of the mould is perpendicular to the end faces
- the internal surface of the mould is kept clean and free from set cement
- the mould is in the form of a frustum of hexagonal pyramid
Q17 | The concrete mix which causes difficulty in obtaining a smooth finish, possess
- segregation
- internal friction
- hardness
- bleeding
Q18 | While designing the pile as a column, the end conditions are nearly
- both ends hinged
- both ends fixed
- one end fixed and other end hinged
- one end fixed and other end free
Q19 | The internal dimensions of a ware house are 15 m × 5.6 m, and the maximum height of piles is2.70 m, the maximum number of bags to be stored in two piles, are
- 1500 bags
- 2000 bags
- 2500 bags
- 3000 bags
Q20 | Pick up the incorrect statement from the following. While performing preliminary test on concrete
- proportions of the material and water should be the same as to be used at the work site
- cement should be mixed by hand in order to maintain uniformity
- concrete mix should be stored in air-tight containers
- concrete ingredients should be kept at a temperature of 37° ± 2°c
Q21 | In a spherical dome the hoop stress due to a concentrated load at crown is
- compressive everywhere
- tensile everywhere
- partly compressive and partly tensile
- zero
Q22 | I.S. Sieve Nos. 10 mm and 4.75 mm are generally used for grading of
- coarse aggregates
- fine aggregates
- neither (a) nor (b)
- both (a) and (b)
Q23 | Log Angles machine is used to test the aggregate for
- crushing strength
- impact value
- abrasion resistance
- water absorption
Q24 | The property of the ingredients to separate from each other while placing the concrete is called
- segregation
- compaction
- shrinkage
- bulking
Q25 | Pick up the correct statement from the following:
- higher workability indicates unexpected increase in the moisture content
- higher workability indicates deficiency of sand
- if the concrete mix is dry, the slump is zero
- all the above