# Concrete Technology and Design Multiple Choice Tests – Set 02

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## Q1. The diameter of ties in a column should be

(A) More than or equal to one fourth of diameter of main bar
(B) More than or equal to 5 mm
(C) More than 5 mm but less than one-fourth of diameter of main bar
(D) More than 5 mm and also more than one-fourth of diameter of main bar

Answer: (D) More than 5 mm and also more than one-fourth of diameter of main bar

## Q2. Pick up the correct statement from the following:

(A) The maximum size of a coarse aggregate, is 75 mm and minimum 4.75 mm
(B) The maximum size of the fine aggregate, is 4.75 mm and minimum 0.075 mm
(C) The material having particles of size varying from 0.06 mm to 0.002 mm, is known as silt
(D) All the above

## Q3. Admixtures which cause early setting and hardening of concrete are called

(B) Accelerators
(C) Retarders
(D) Air entraining agents

## Q4. In counterfort retaining walls, the main reinforcement in the stem at support is

(A) Not provided
(B) Provided only on inner face
(C) Provided only on front face
(D) Provided both on inner and front faces

Answer: (B) Provided only on inner face

## Q5. In a counterfort retaining wall, the main reinforcement is provided on the(i) Bottom face in front counterfort(ii) Inclined face in front counterfort(iii) Bottom face in back counterfort(iv) Inclined face in back counterfortThe correct answer is

(A) (i) and (ii)
(B) (ii) and (iii)
(C) (i) and (iv)
(D) (iii) and (iv)

## Q6. Pick up the correct statement from the following:

(A) Sand stones may be divided into calcareous, siliceous and ferruginous sand stones
(B) Concrete using sand stones, cracks due to excessive shrinkage
(C) Broken bricks produce a concrete having good fire resisting qualities
(D) All the above

## Q7. Due to shrinkage stresses, a simply supported beam having reinforcement only at bottom tends to

(A) Deflect downward
(B) Deflect upward
(C) Deflect downward or upward
(D) None of the above

## Q8. For construction of structures in sea water, the cement generally preferred to, is

(A) Portland-pozzolana cement
(B) Quick setting cement
(C) Low heat Portland cement
(D) Rapid hardening cement

## Q9. Pick up the incorrect statement from the following:

(B) Admixtures make concrete water proof
(C) Admixtures make concrete acid proof

## Q10. The purpose of reinforcement in pre-stressed concrete is

(A) To provide adequate bond stress
(B) To resist tensile stresses
(C) To impart initial compressive stress in concrete
(D) All of the above

Answer: (C) To impart initial compressive stress in concrete

## Q11. Curing of pavements, floors, roofs and slabs, is done by

(A) Membrane method
(B) Ponding method
(C) Covering surface with bags
(D) Sprinkling water method

## Q12. For a reinforced concrete section, the shape of shear stress diagram is

(A) Wholly parabolic
(B) Wholly rectangular
(C) Parabolic above neutral axis and rectangular below neutral axis
(D) Rectangular above neutral axis and parabolic below neutral axis

Answer: (C) Parabolic above neutral axis and rectangular below neutral axis

## Q13. Select the correct statement

(A) Elastic modulus of high tensile steel is nearly the same as that of mild steel
(B) Elastic modulus of high tensile steel is more than that of mild steel
(C) Carbon percentage in high carbon steel is less than that in mild steel
(D) High tensile steel is cheaper than mild steel

Answer: (A) Elastic modulus of high tensile steel is nearly the same as that of mild steel

## Q14. The centroid of compressive force, from the extreme compression fiber, in limit state design lies at a distance of

(A) 0.367 xu
(B) 0.416 xu
(C) 0.446 xu
(D) 0.573 xu
Where xu is the depth of neutral axis at the limit state of collapse

## Q15. Allowable shear strength of concrete, depends upon

(A) Shear strength
(B) Tensile strength
(C) Compressive strength
(D) None of these