# Concrete Technology Objective Questions with Answer Key – Set 09

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## Q1. 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

## Q2. 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

## Q3. The risk of segregation is more for

(A) Wetter mix
(B) Larger proportion of maximum size aggregate
(D) All the above

(A) 10 %
(B) 12.5 %
(C) 15 %
(D) 18.5 %

## Q5. 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

Answer: (B) 0.3P + 0.1Y + 0.01Z = W/C × P

## Q6. Le-Chatelier’s apparatus is used for testing

(A) Soundness of cement
(B) Hardness of cement
(C) Strength of cement
(D) Durability of cement

## Q7. 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

## Q8. 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)

(A) 0.43 d
(B) 0.537 d
(C) 0.68 d
(D) 0.85 d

## Q10. 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

(A) 7.30
(B) 7.35
(C) 7.40
(D) 7.45

## Q12. Construction joints are generally provided in concrete

(B) Retaining walls
(C) Lining of canals
(D) All the above

## Q13. The maximum percentage of chemical ingredient of cement is that of

(A) Magnesium oxide
(B) Iron oxide
(C) Silica
(D) Lime

## Q14. 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

Answer: (D) Swelling of sand when wetted

## Q15. If a grading curve is horizontal between the portions of 20 mm I.S. Sieve and 4.75 mm I.S. Sieve, the graded aggregates do not contain

(A) 20 mm particles
(B) 10 mm particles
(C) 4.75 mm particles
(D) All the above