Concrete Technology and Design Objective Type Questions - ObjectiveBooks

Concrete Technology and Design Objective Type Questions

Practice Test: Question Set - 23

1. The maximum thickness of concrete floor of a cement warehouse, is
    (A) 10 cm
    (B) 15 cm
    (C) 20 cm
    (D) 25 cm

2. Too wet concrete may cause
    (A) Weakness of concrete
    (B) Excessive laitance
    (C) Segregation
    (D) All the above

3. Maximum percentage reinforcement in case of slabs is limited to
    (A) 2
    (B) 4
    (C) 6
    (D) 8

4. The commonly used material in the manufacture of cement is
    (A) Sand stone
    (B) Slate
    (C) Lime stone
    (D) Graphite

5. According to I.S. : 456, the number of grades of concrete mixes, is
    (A) 3
    (B) 4
    (C) 5
    (D) 7

6. Grading of sand causes great variation in
    (A) Workability of concrete
    (B) Strength of concrete
    (C) Durability of concrete
    (D) All the above

7. The percentage of the aggregate of F.M. 2.6 to be combined with coarse aggregate of F.M. 6.8 for obtaining the aggregates of F.M. 5.4, is
    (A) 30 %
    (B) 40 %
    (C) 50 %
    (D) 60 %

8. The ratio of various ingredients (cement, sand, aggregates) in concrete of grade M 200, is
    (A) 1 : 2 : 4
    (B) 1 : 3 : 6
    (C) 1 : 1½ : 3
    (D) 1 : 1 : 2

9. Joints in concrete structures, are provided
    (A) To reduce the tensile stresses likely to be developed due to evaporation of water
    (B) To minimize the change in the dimensions of the slab
    (C) To minimize the necessary cracking
    (D) All the above

10. For the construction of R.C.C. slabs, columns, beams, walls, etc. the grade of concrete mix used, is
    (A) 1 : 3 : 6
    (B) 1 : 1½ : 3
    (C) 1 : 2 : 4
    (D) 1 : 1 : 2

11. Pick up the correct statement from the following:
    (A) Water enables chemical reaction to take place with cement
    (B) Water lubricates the mixture of gravel, sand and cement
    (C) Strength of concrete structure largely depends upon its workability
    (D) All the above

12. The final operation of finishing floors, is known as
    (A) Screeding
    (B) Floating
    (C) Trowelling
    (D) Finishing

13. Transport of concrete by pumps, is done for a distance of
    (A) 100 m
    (B) 200 m
    (C) 300 m
    (D) 400 m

14. Curing
    (A) Reduces the shrinkage of concrete
    (B) Preserves the properties of concrete
    (C) Prevents the loss of water by evaporation
    (D) All of the above

15. The datum temperature for maturity by Plowman, is
    (A) 23°C
    (B) 0°
    (C) - 5.6°C
    (D) - 11.7°C

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