# Concrete Technology and Design Objective Type Questions SET -23

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(A) 0
(B) 10
(C) 20
(D) 30

## Q2. The effect of adding calcium chloride in concrete is(i) To increase shrinkage(ii) To decrease shrinkage(iii) To increase setting time(iv) To decrease setting timeThe correct answer is

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

(B) (i) and (iv)

(B) Curing
(C) Mixing
(D) Batching

(A) 50 mm
(B) 75 mm
(C) 100 mm
(D) 120 mm

(A) 100 m
(B) 200 m
(C) 300 m
(D) 400 m

## Q6. If X, Y and Z are the fineness modulli of coarse, fine and combined aggregates, the percentage (P) of fine aggregates to combined aggregates, is

(A) P = [(Z – X)/(Z – Y)] × 100
(B) P = [(X – Z)/(Z – Y)] × 100
(C) P = [(X – Z)/(Z + Y)] × 100
(D) P = [(Z + X)/(Z – Y)] × 100

Answer: (B) P = [(X – Z)/(Z – Y)] × 100

(A) 100 kg/cm2
(B) 150 kg/cm2
(C) 200 kg/cm2
(D) 300 kg/cm2

(A) 1.5 and 2.2
(B) 2.2 and 1.5
(C) 1.5 and 1.5
(D) 2.2 and 2.2

## Q9. The most useless aggregate is one whose surface texture is

(A) Smooth
(B) Granular
(C) Glassy
(D) Honey combed and porous

## Q10. Curing

(A) Reduces the shrinkage of concrete
(B) Preserves the properties of concrete
(C) Prevents the loss of water by evaporation
(D) All of the above

Answer: (D) All of the above

## Q11. If the depth of actual neutral axis in a beam is more than the depth of critical neutral axis, then the beam is called

(A) Balanced beam
(B) Under-reinforced beam
(C) Over-reinforced beam
(D) None of the above

## Q12. Strength of concrete increases with

(A) Increase in water-cement ratio
(B) Increase in fineness of cement
(C) Decrease in curing time
(D) Decrease in size of aggregate

Answer: (B) Increase in fineness of cement

(A) 1000°C
(B) 1200°C
(C) 1400°C
(D) 1600°C

## Q14. The shrinkage of concrete

(A) Is proportional to water content is the mix
(B) Is proportional to cement concrete
(C) Increases with age of concrete
(D) All the above