# Concrete Technology and Design Objective Type Questions SET -23

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

Answer: (B) 10

## 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)

## Q3. The process of proper and accurate measurement of concrete ingredients for uniformity of proportion, is known

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

Answer:(D) Batching

## Q4. For a continuous slab of 3 m × 3.5 m size, the minimum overall depth of slab to satisfy vertical deflection limits is

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

Answer: (B) 75 mm

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

Answer:(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

## Q7. Permissible compressive strength of M 300 concrete grade is

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

Answer: (D) 300 kg/cm2

## Q8. The load factors for live load and dead load are taken respectively as

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

Answer: (B) 2.2 and 1.5

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

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

Answer: (C) Glassy

## 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

Answer: (C) Over-reinforced beam

## 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

## Q13. The mixture of different ingredients of cement, is burnt at

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

Answer: (C) 1400°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

Answer: (D) All the above

## Q15. The datum temperature for maturity by Plowman, is

(A) 23°C
(B) 0°
(C) – 5.6°C
(D) – 11.7°C

Answer: (D) – 11.7°C

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