Concrete Technology and Design MCQ pdf - Set 04 - ObjectiveBooks

Concrete Technology and Design MCQ pdf - Set 04

Practice Test: Question Set - 04


1. For the construction of cement concrete dams, the maximum permissible size of the aggregates, is
    (A) 40 mm
    (B) 50 mm
    (C) 60 mm
    (D) 70 mm

2. Pick up the incorrect statement from the following:
    (A) With passage of time, the strength of cement increases
    (B) With passage of time, the strength of cement decreases
    (C) After a period of 24 months, the strength of cement reduces to 50%
    (D) The concrete made with storage deteriorated cement, gains strength with time

3. The load carrying capacity of a helically reinforced column as compared to that of a tied column is about
    (A) 5 % less
    (B) 10 % less
    (C) 5 % more
    (D) 10 % more

4. To hydrate 500 kg of cement full water needed, is
    (A) 100 kg
    (B) 110 kg
    (C) 120 kg
    (D) 130 kg

5. Pick up the correct statement from the following:
    (A) A highly absorptive aggregate reduces the workability of concrete considerably
    (B) The specific gravity of aggregate is important for the determination of the moisture content
    (C) The absorption and porosity of an aggregate influence the property of the concrete
    (D) All the above

6. In a counterfort retaining wall, the main reinforcement in the stem at mid span is provided on
    (A) Front face only
    (B) Inner face only
    (C) Both front face and inner face
    (D) None of the above

7. 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

8. Water cement ratio is generally expressed in volume of water required per
    (A) 10 kg
    (B) 20 kg
    (C) 30 kg
    (D) 50 kg

9. The minimum cover in a slab should neither be less than the diameter of bar nor less than
    (A) 10 mm
    (B) 15 mm
    (C) 25 mm
    (D) 13 mm

10. To ensure constant moisture content in aggregates
    (A) Area of each aggregate pile should be large
    (B) Height of each aggregate pile should not exceed 1.50 m
    (C) Aggregate pile should be left for 24 hours before aggregates are used
    (D) All the above

11. Pick up the correct statement from the following:
    (A) Cement should be mixed for at least one minute
    (B) 10% of water is placed in the rotating drum before adding dry material
    (C) 10% of water is added after placing the other ingredients in the drum
    (D) All the above

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

13. Concrete mainly consists of
    (A) Cement
    (B) Aggregates
    (C) Water
    (D) All the above

14. For the construction of thin R.C.C. structures, the type of cement to be avoided, is
    (A) Ordinary Portland cement
    (B) Rapid hardening cement
    (C) Low heat cement
    (D) Blast furnace slag cement

15. Which of the following R.C. retaining walls is suitable for heights beyond 6 m?
    (A) L-shaped wall
    (B) T-shaped wall
    (C) Counterfort type
    (D) All of the above

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