Civil Engineering MCQs with Answers Concrete Technology - Set 08 - ObjectiveBooks

Civil Engineering MCQs with Answers Concrete Technology - Set 08

Practice Test: Question Set - 08


1. Select the incorrect statement
    (A) The loss of pre-stress is more in pre-tensioning system than in post-tensioning system
    (B) Pre-tensioning system has greater certainty about its durability
    (C) For heavy loads and large spans in buildings or bridges, post-tensioning system is cheaper than pre-tensioning system
    (D) None of the above

2. The commercial name of white and colored cement in India, is
    (A) Colorcrete
    (B) Silvicrete
    (C) Snowcem
    (D) All the above

3. An excess of flaky particles in concrete aggregates
    (A) Decreases the workability
    (B) Increases the quantity of water and sand
    (C) More than 15% are not desirable
    (D) All the above

4. Increase in the moisture content in concrete
    (A) Reduces the strength
    (B) Increases the strength
    (C) Does not change the strength
    (D) All of the above

5. Pick up the correct statement from the following:
    (A) High percentage of C3S and low percentage of C2S cause rapid hardening
    (B) High percentage of C3S and low percentage of C2S make the cement less resistive to chemical attack
    (C) Low percentage of C3S and high percentage of C2S contribute to slow hardening
    (D) All the above

6. The 28 days cube strength of mass concrete using aggregates of maximum size 5 cm for gravity dams should be
    (A) Between 150 to 300 kg/cm2
    (B) Between 350 to 600 kg/cm2
    (C) Between 150 to 500 kg/cm2
    (D) Below 200 kg/cm2

7. Select the incorrect statement
    (A) Lean mixes bleed more as compared to rich ones
    (B) Bleeding can be minimized by adding pozzolana finer aggregate
    (C) Bleeding can be increased by addition of calcium chloride
    (D) None of the above

8. Permissible compressive strength of M 150 concrete grade is
    (A) 100 kg/cm2
    (B) 150 kg/cm2
    (C) 200 kg/cm2
    (D) 250 kg/cm2

9. Cement used for normal concrete construction, is obtained by burning a mixture of
    (A) Siliceous and argillaceous materials
    (B) Argillaceous and calcareous materials
    (C) Siliceous and calcareous materials
    (D) Siliceous, argillaceous and calcareous materials

10. As compared to ordinary Portland cement, high alumina cement has
    (A) Higher initial setting time but lower final setting time
    (B) Lower initial setting time but higher final setting time
    (C) Higher initial and final setting times
    (D) Lower initial and final setting times

11. The maximum amount of dust which may be permitted in aggregates is
    (A) 5% of the total aggregates for low workability with a coarse grading
    (B) 10% of the total aggregates for low workability with a fine grading
    (C) 20% of the total aggregates for a mix having high workability with fine grading
    (D) All the above

12. If P, Y and Z are the weights of cement, fine aggregates and coarse aggregates respectively and W/C is the water cement ratio, the minimum quantity of water to be added to first batch, is obtained by the equation
    (A) 0.1P + 0.3Y + 0.1Z = W/C × P
    (B) 0.3P + 0.1Y + 0.01Z = W/C × P
    (C) 0.4P + 0.2Y + 0.01Z = W/C × P
    (D) 0.5P + 0.3Y + 0.01Z = W/C × P

13. Examine the following statements:
    (i) Factor of safety for steel should be based on its yield stress,
    (ii) Factor of safety for steel should be based on its ultimate stress,
    (iii) Factor of safety for concrete should be based on its yield stress,
    (iv) Factor of safety for concrete should be based on its ultimate stress.
    The correct statements are
    (A) (i) and (iii)
    (B) (i) and (iv)
    (C) (ii) and (iii)
    (D) (ii) and (iv)

14. If 20 kg of coarse aggregate is sieved through 80 mm, 40 mm, 20 mm, 10 mm, 4.75 mm, 2.36 mm, 1.18 mm, 600 micron, 300 micron and 150 micron standard sieves and the weights retained are 0 kg, 2 kg, 8 kg, 6 kg, 4 kg respectively, the fineness modulus of the aggregate, is
    (A) 7.30
    (B) 7.35
    (C) 7.40
    (D) 7.45

15. Bulking of sand is
    (A) Mixing of different sizes of sand particles
    (B) Mixing of lime with sand
    (C) Maximum water with sand
    (D) Swelling of sand when wetted

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