Concrete technology objective question 

Question No. 1 Which of the following statements is incorrect?

(A) Minimum cross sectional area of longitudinal reinforcement in a column is 0.8%
(B) Spacing of longitudinal bars measured along the periphery of column should not exceed 300 mm
(C) Reinforcing bars in a column should not be less than 12 mm in diameter
(D) The number of longitudinal bars provided in a circular column should not be less than four

Question No. 2 For road pavements, the cement generally used, is

(A) Ordinary Portland cement
(B) Rapid hardening cement
(C) Low heat cement
(D) Blast furnace slag cement
Answer: Option B

Question No. 3 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
Answer: Option A

Question No. 4 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
Answer: Option B

Question No. 5 Concrete gains strength due to

(A) Chemical reaction of cement with sand and coarse aggregates
(B) Evaporation of water from concrete
(C) Hydration of cement
(D) All the above
Answer: Option C

Question No. 6 Pick up the incorrect statement from the following. For performing compressive strength test of cement

(A) Cement and standard sand mortar are used in the ratio of 1 : 3
(B) Water is added at the rate of (P/4) + 3.0 percentage of water where P is the percentage of water for standard consistency
(C) A cube mould of 10 cm × 10 cm × 10 cm is used
(D) The prepared moulds are kept in a atmosphere of 50% relative humidity
Answer: Option A

Question No. 7 Pick up the incorrect statement from the following:

(A) Concrete for which preliminary tests are conducted, is called controlled concrete
(B) Bulking of sand depends upon the fineness of grains
(C) Concrete mix 1 : 6 : 12, is used for mass concrete in piers
(D) All the above
Answer: Option D

Question No. 8 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
Answer: Option D

Question No. 9 Pick up the incorrect statement from the following:

(A) The degree of grinding of cement, is called fineness
(B) The process of changing cement paste into hard mass, is known as setting of cement
(C) The phenomenon by virtue of which cement does not allow transmission of sound, is known as soundness of cement
(D) The heat generated during chemical reaction of cement with water, is known as heat of hydration
Answer: Option C

Question No. 10 Which of the following has high tensile strength?

(A) Plain hot rolled wires
(B) Cold drawn wires
(C) Heat treated rolled wires
(D) All have same tensile strength

Question No. 11 In symmetrically reinforced sections, shrinkage stresses in concrete and steel are respectively

(A) Compressive and tensile
(B) Tensile and compressive
(C) Both compressive
(D) Both tensile
Answer: Option B

Question No. 12 Critical section for shear in case of flat slabs is at a distance of

(A) Effective depth of slab from periphery of column/drop panel
(B) d/2 from periphery of column/capital/ drop panel
(C) At the drop panel of slab
(D) At the periphery of column
Answer: Option B

Question No. 13 Pick up the incorrect statement from the following:

(A) Space between the exterior walls of a warehouse and bag piles should be 30 cm
(B) Cement bags should preferably be piled on wooden planks
(C) Width and height of the pile should not exceed 3 m and 2.70 m respectively
(D) None of these
Answer: Option D

Question No. 14 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: Option D             Concrete Technology  objective question- 02

Question No. 15 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: Option C

Question No. 16 Bulking of sand is maximum if moisture content is about

(A) 2 %
(B) 4 %
(C) 6 %
(D) 10 %
Answer: Option B

Question No. 17 For a slab supported on its four edges with corners held down and loaded uniformly, the Marcus correction factor to the moments obtained by Grashoff Rankine's theory

(A) Is always less than 1
(B) Is always greater than 1
(C) Can be more than 1
(D) Can be less than 1
Answer: Option A

Question No. 18 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
Answer: Option D           Concrete Technology  objective question- 02

Question No. 19 Addition of pozzolana to ordinary port land cement, causes

(A) Decrease in early strength
(B) Reduction in chemical action with sulphates
(C) Increase in shrinkage
(D) All the above
Answer: Option D

Question No. 20 Pick up the incorrect statement from the following:

(A) Admixtures accelerate hydration
(B) Admixtures make concrete water proof
(C) Admixtures make concrete acid proof
(D) Admixtures give high strength
Answer: Option A

Question No. 21 The load carrying capacity of a helically reinforced column as compared to that of a tied column is about

(A) 5 % less
(B) 10 % less
(C) 5 % more
(D) 10 % more
Answer: Option C

Question No. 22 The average permissible stress in bond for plain bars in tension is

(A) Increased by 10% for bars in compression
(B) Increased by 25% for bars in compression
(C) Decreased by 10% for bars in compression
(D) Decreased by 25% for bars in compression
Answer: Option B

Question No. 23 To ensure constant moisture content in aggregates

(A) Area of each aggregate pile should be large
(B) Height of each aggregate pile should not exceed 1.50 m
(C) Aggregate pile should be left for 24 hours before aggregates are used
(D) All the above
Answer: Option D

Question No. 24 Pick up the correct statement from the following:

(A) Cement should be mixed for at least one minute
(B) 10% of water is placed in the rotating drum before adding dry material
(C) 10% of water is added after placing the other ingredients in the drum
(D) All the above
Answer: Option D

Question No. 25 Concrete mainly consists of

(A) Cement
(B) Aggregates
(C) Water
(D) All the above
Answer: Option D

Question No. 26 The temperature reinforcement in the vertical slab of a T-shaped R.C. retaining wall is

(A) Not needed
(B) Provided equally on inner and front faces
(C) Provided more on inner face than on front face
(D) Provided more on front face than on inner face
Answer: Option D

Question No. 27 Due to circumferential action of the spiral in a spirally reinforced column

(A) Capacity of column is decreased
(B) Ductility of column reduces
(C) Capacity of column is decreased but ductility of column increases
(D) Both the capacity of column and ductility of column increase
Answer: Option D           Concrete Technology  objective question- 02

Question No. 28 To determine the modulus of rupture, the size of test specimen used is

(A) 150 × 150 × 500 mm
(B) 100 × 100 × 700 mm
(C) 150 × 150 × 700 mm
(D) 100 × 100 × 500 mm
Answer: Option C

Question No. 29 Tricalcium aluminate (C3A)

(A) Reacts fast with water
(B) Generates less heat of hydration
(C) Causes initial setting and early strength of cement
(D) Does not contribute to develop ultimate strength
Answer: Option B

Question No. 30 Water cement ratio is generally expressed in volume of water required per

(A) 10 kg
(B) 20 kg
(C) 30 kg
(D) 50 kg
Answer: Option            Concrete Technology  objective question- 02