Multiple Choice Questions on Concrete Technology - Set 07 - ObjectiveBooks

Multiple Choice Questions on Concrete Technology - Set 07

Practice Test: Question Set - 07


1. Finer grinding of cement
    (A) Affects only the early development of strength
    (B) Affects only the ultimate strength
    (C) Both (A) and (B)
    (D) Does not affect the strength

2. The light weight aggregates are obtained from
    (A) Sedimentary rocks
    (B) Metamorphic rocks
    (C) Igneous rocks
    (D) Volcanic source

3. The aggregate impact value of the aggregate used in
    (A) Building concrete is less than 45
    (B) Road pavement concrete is less than 30
    (C) Runway concrete is less than 30
    (D) All the above

4. For walls, columns and vertical faces of all structural members, the form work is generally removed after
    (A) 24 to 48 hours
    (B) 3 days
    (C) 7 days
    (D) 14 days

5. Efflorescence in cement is caused due to an excess of
    (A) Alumina
    (B) Iron oxide
    (C) Silica
    (D) Alkalis

6. For given workability the grading requiring the least amount of water is one that gives
    (A) Greatest surface area for the given cement and aggregates
    (B) Least surface area for the given cement and aggregates
    (C) Least weight for the given cement and aggregates
    (D) Greatest weight for the given cement and aggregates

7. Minimum pitch of transverse reinforcement in a column is
    (A) The least lateral dimension of the member
    (B) Sixteen times the smallest diameter of longitudinal reinforcement bar to be tied
    (C) Forty-eight times the diameter of transverse reinforcement
    (D) Lesser of the above three values

8. Pick up the incorrect statement applicable to the field test of good cement.
    (A) When one thrusts one's hand into a bag of cement, one should feel warm
    (B) The color of the cement is bluish
    (C) By rubbing cement in between fingers, one should feed rough
    (D) All the above

9. An aggregate is known as cyclopean aggregate if its size is more than
    (A) 4.75 mm
    (B) 30 mm
    (C) 60 mm
    (D) 75 mm

10. In counterfort type retaining walls
    (i) The vertical slab is designed as a continuous slab
    (ii) The heel slab is designed as a continuous slab
    (iii) The vertical slab is designed as a cantilever
    (iv) The heel slab is designed as a cantilever
    The correct answer is
    (A) (i) and (ii)
    (B) (i)and(iv)
    (C) (ii) and (iii)
    (D) (iii) and (iv)

11. Workability of concrete mix with low water cement ratio is determined by
    (A) Tensile strength test
    (B) Slump test
    (C) Compaction factor test
    (D) Flexural strength test

12. If the average compressive strength is 4000 kg/cm2 and standard deviation is 500, the co-efficient of variation is
    (A) 10 %
    (B) 12.5 %
    (C) 15 %
    (D) 18.5 %

13. The effect of creep on modular ratio is
    (A) To decrease it
    (B) To increase it
    (C) Either to decrease or to increase it
    (D) To keep it unchanged

14. The type of aggregates not suitable for high strength concrete and for pavements subjected to tension, is
    (A) Rounded aggregate
    (B) Irregular aggregate
    (C) Angular aggregate
    (D) Flaky aggregate

15. The maximum percentage of chemical ingredient of cement is that of
    (A) Magnesium oxide
    (B) Iron oxide
    (C) Silica
    (D) Lime

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