Concrete Technology Civil Engineering Questions and Answers - Set 06 - ObjectiveBooks

Concrete Technology Civil Engineering Questions and Answers - Set 06

Practice Test: Question Set - 06


1. Concrete containing
    (A) Siliceous aggregates, has higher co-efficient of expansion
    (B) Igneous aggregates, has intermediate coefficient of expansion
    (C) Lime stones, has lowest co-efficient of expansion
    (D) All the above

2. The lower water cement ratio in concrete, introduces
    (A) Smaller creep and shrinkage
    (B) Greater density and smaller permeability
    (C) Improved frost resistance
    (D) All the above

3. In T-shaped R C. retaining walls, the main reinforcement in the stem is provided on
    (A) The front face in one direction
    (B) The front face in both directions
    (C) The inner face in one direction
    (D) The inner face in both directions

4. The aggregate containing moisture in pores and having its surface dry, is known as
    (A) Moist aggregates
    (B) Very dry aggregates
    (C) Dry aggregates
    (D) Saturated surface dry aggregate

5. Pick up the correct statement from the following:
    (A) Construction joints in columns are provided a few cm below the junction of beam
    (B) Construction joints in columns are provided at the bottom hunching
    (C) Construction joints in beams and slabs are provided within middle third
    (D) All the above

6. According to ISI recommendations, the maximum depth of stress block for balanced section of a beam of effective depth d is
    (A) 0.43 d
    (B) 0.55 d
    (C) 0.68 d
    (D) 0.85 d

7. Pick up the correct proportions of chemical ingredients of cement
    (A) Lime : Silica : Alumina : Iron oxide : 63 : 22 : 6 : 3
    (B) Silica : Lime : Alumina : Iron oxide : 63 : 22 : 6 : 3
    (C) Alumina : Silica : Lime : Iron oxide : 63 : 22 : 6 : 3
    (D) Iron oxide : Alumina : Silica : Lime : 63 : 22 : 6 : 3

8. Internal friction between the ingredients of concrete, is decreased by using
    (A) Less water
    (B) Fine aggregates
    (C) Rich mix
    (D) More water and coarse aggregates

9. Pick up the correct statement from the following:
    (A) The quality of water governs the strength of concrete
    (B) 10% excess of water reduces the strength of concrete by 15%
    (C) 30% excess of water reduces the strength of concrete by 50%
    (D) All the above

10. 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

11. Pick up the correct statement from the following:
    (A) Lime in excess, causes the cement to expand and disintegrate
    (B) Silica in excess, causes the cement to set slowly
    (C) Alumina in excess, reduces the strength of the cement
    (D) All the above

12. If the effective plan area of a warehouse is 54 sq. m, and maximum height of piles permitted is 270 cm, the number of cement bags to be stored, is
    (A) 2000 bags
    (B) 2200 bags
    (C) 2400 bags
    (D) 2700 bags

13. The property of fresh concrete, in which the water in the mix tends to rise to the surface while placing and compacting, is called
    (A) Segregation
    (B) Bleeding
    (C) Bulking
    (D) Creep

14. Workability of concrete for a given water content is good if the aggregates, are
    (A) Rounded aggregate
    (B) Irregular aggregate
    (C) Angular aggregate
    (D) Flaky aggregates

15. For preparing ordinary concrete, the quantity of water used, is
    (A) 5% by weight of aggregates plus 20% of weight of cement
    (B) 10% by weight of aggregates plus 10% of weight of cement
    (C) 5% by weight of aggregates plus 30% of weight of cement
    (D) 30% by weight of aggregates plus 10% of weight of cement

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