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4

Pick up the correct statement from the following:

A. A highly absorptive aggregate reduces the workability of concrete considerably

B. The specific gravity of aggregate is important for the determination of the moisture content

C. The absorption and porosity of an aggregate influence the property of the concrete

D. All the above

Correct Answer :

D. All the above


Related Questions

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4

The top diameter, bottom diameter and the height of a slump mould are:

A. 10 cm, 20 cm, 30 cm

B. 10 cm, 30 cm, 20 cm

C. 20 cm, 10 cm, 30 cm

D. 20 cm, 30 cm, 10 cm

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4

The 28 days cube strength of mass concrete using aggregates of maximum size 5 cm for gravity dams should be

A. Between 150 to 300 kg/cm2

B. Between 350 to 600 kg/cm2

C. Between 150 to 500 kg/cm2

D. Below 200 kg/cm2

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4

The fineness modulus of fine aggregate is in the range of

A. 2.0 to 3.5

B. 3.5 to 5.0

C. 5.0 to 7.0

D. 6.0 to 8.5

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4

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

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4

The slab is designed as one way if the ratio of long span to short span is

A. Less than 1

B. Between 1 and 1.5

C. Between 1.5 and 2

D. Greater than 2

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4

Finer grinding of cement

A. Affects only the early development of strength

B. Affects only the ultimate strength

C. Both (A) and (B)

D. Does not affect the strength

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4

Air entrainment in the concrete increases

A. Workability

B. Strength

C. The effects of temperature variations

D. The unit weight

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4

Particles of 0.002 mm size are that of

A. Clay

B. Sand

C. Gravel

D. None of these

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4

Assertion A : The load factor for live load is greater than that for dead load. Reason R : The live loads are more uncertain than dead loads. Select your answer based on the coding system given below:

A. Both A and R is true and R is the correct explanation of A

B. Both A and R is true but R is not the correct explanation of A

C. A is true but R is false

D. A is false but R is true

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4

The property of fresh concrete, in which the water in the mix tends to rise to the surface while placing and compacting, is called

A. Segregation

B. Bleeding

C. Bulking

D. Creep

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4

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

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4

During erection, the pile of length l is supported by a crane at a distance of

A. 0.207 l

B. 0.293 l

C. 0.707 l

D. 0.793 l From the driving end of pile which rests on the ground

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4

Pick up the correct statement from the following:

A. Bulking of sand is caused due to formation of a thin film of surface moisture

B. Fine sand bulks more than coarse sand

C. The volume of fully saturated sand, is equal to the volume of dry and loose sand

D. All the above

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4

Log Angles machine is used to test the aggregate for

A. Crushing strength

B. Impact value

C. Abrasion resistance

D. Water absorption

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4

In a spherical dome subjected to concentrated load at crown or uniformly distributed load, the meridional force is always

A. Zero

B. Tensile

C. Compressive

D. Tensile or compressive

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4

Approximate value of shrinkage strain in concrete, is

A. 0.003

B. 0.0003

C. 0.00003

D. 0.03

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4

Pick up the correct statement from the following:

A. The concrete gains strength due to hydration of cement

B. The concrete does not set at freezing point

C. The strength of concrete increases with its age

D. All the above

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4

The rock which is not calcareous, is:

A. Lime stone

B. Chalk

C. Laterite

D. None of these

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4

Minimum pitch of transverse reinforcement in a column is

A. The least lateral dimension of the member

B. Sixteen times the smallest diameter of longitudinal reinforcement bar to be tied

C. Forty-eight times the diameter of transverse reinforcement

D. Lesser of the above three values

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4

If 20 kg of coarse aggregate is sieved through 80 mm, 40 mm, 20 mm, 10 mm, 4.75 mm, 2.36 mm, 1.18 mm, 600 micron, 300 micron and 150 micron standard sieves and the weights retained are 0 kg, 2 kg, 8 kg, 6 kg, 4 kg respectively, the fineness modulus of the aggregate, is

A. 7.30

B. 7.35

C. 7.40

D. 7.45

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4

Addition of pozzolana to cement causes

A. Reduction in permeability

B. Loss of heat of hydration

C. Reduction in bleeding

D. All the above

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4

M 150 grade of concrete approximates

A. 1 : 3 : 6 mix

B. 1 : 1 :2 mix

C. 1 : 2 : 4 mix

D. 1 : 1.5 : 3 mix

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4

In the method of voids for determination of the quantity of cement paste, it is assumed that

A. Voids in coarse aggregates are filled by fine aggregates

B. Voids in fine aggregates are filled by the cement paste

C. Volume of fine aggregates is equal to total voids in coarse aggregates plus 10% extra

D. All the above

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4

M10 grade of concrete approximates

A. 1 : 3 : 6 mix

B. 1 : 1 : 2 mix

C. 1 : 2 : 4 mix

D. 1 : 1.5 : 3 mix

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4

Efflorescence in cement is caused due to an excess of

A. Alumina

B. Iron oxide

C. Silica

D. Alkalis

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4

The bulk density of aggregates, depends upon

A. Shape

B. Grading

C. Compaction

D. All the above

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4

The grade of concrete not recommended by I.S. : 456, is

A. M 100

B. M 200

C. M 300

D. M 500

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4

The approximate value of the ratio between direct tensile strength and flexural strength is

A. 0.33

B. 0.5

C. 0.75

D. 1.0

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4

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

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4

The critical section for finding maximum bending moment for footing under masonry wall is located

A. At the middle of the wall

B. At the edge of the wall

C. Halfway between the middle and edge of the wall

D. At a distance equal to effective depth of footing from the edge of the wall