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4

The process of hardening the concrete by keeping its surface moist is known

A. Placing

B. Wetting

C. Curing

D. Compacting

Correct Answer :

C. Curing


Related Questions

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4

According to IS : 382-1963, a good aggregate should be

A. Chemically inert

B. Sufficiently strong

C. Hard and durable

D. All the above

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4

A T-shaped retaining wall mainly consists of

A. One cantilever

B. Two cantilevers

C. Three cantilevers

D. Four cantilevers

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4

Minimum thickness of load bearing RCC wall should be

A. 50 mm

B. 100 mm

C. 150 mm

D. 200 mm

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4

The mixture of different ingredients of cement, is burnt at

A. 1000°C

B. 1200°C

C. 1400°C

D. 1600°C

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4

Addition of pozzolana to cement

A. Decreases workability

B. Increases strength

C. Increases heat of hydration

D. None of these

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4

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

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4

The internal dimensions of a ware house are 15 m × 5.6 m, and the maximum height of piles is 2.70 m, the maximum number of bags to be stored in two piles, are

A. 1500 bags

B. 2000 bags

C. 2500 bags

D. 3000 bags

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4

On a grading curve, the gap grading is represented by

A. A horizontal line

B. A vertical line

C. N.W. inclined line

D. N.E. inclined line

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4

The maximum percentage of chemical ingredient of cement is that of

A. Magnesium oxide

B. Iron oxide

C. Silica

D. Lime

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4

Pick up the correct statement from the following:

A. The weight of ingredients of concrete mix, is taken in kilograms

B. Water and aggregates are measured in litres

C. 20 bags of cement make one tonne

D. All the above

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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

For a good concrete

A. Aggregates should be hard and durable

B. Water should be free from organic materials

C. Cement should be sufficient to produce the required strength

D. All the above

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4

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

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4

According to Water-Cement Ratio Law, the strength of workable plastic concrete

A. Depends upon the amount of water used in the mix

B. Does not depend upon the quality of cement mixed with aggregates

C. Does not depend upon the quantity of cement mixed with aggregates

D. All the above

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4

The diameter of the Vicat plunger is 10 mm and its length varies from

A. 20 mm to 30 mm

B. 30 mm to 40 mm

C. 40 mm to 50 mm

D. 50 mm to 60 mm

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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

Ordinary Portland cement is manufactured from

A. Lime stone and clay

B. Gypsum and lime

C. Pozzolana

D. Lime, pozzolana and clay

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4

A continuous beam is deemed to be a deep beam when the ratio of effective span to overall depth (1/D) is less than

A. 1.5

B. 2.0

C. 2.5

D. 3.0

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4

For ensuring quality of concrete, use

A. Single sized aggregates

B. Two sized aggregate

C. Graded aggregates

D. Coarse aggregates

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4

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

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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

According to IS: 4561978, the flexural strength of concrete is

A. Directly proportional to compressive strength

B. Inversely proportional to compressive strength

C. Directly proportional to square root of compressive strength

D. Inversely proportional to square root of compressive strength

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4

The depth of footing for an isolated column is governed by (i) Maximum bending moment (ii) Shear force (iii) Punching shear The correct answer is

A. Only (i)

B. (i) and (ii)

C. (i) and (iii)

D. All (i), (ii) and (iii)

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4

Pick up the incorrect statement from the following. While performing preliminary test on concrete

A. Proportions of the material and water should be the same as to be used at the work site

B. Cement should be mixed by hand in order to maintain uniformity

C. Concrete mix should be stored in air-tight containers

D. Concrete ingredients should be kept at a temperature of 37° ± 2°C

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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

The percentage of voids in cement is approximately

A. 25 %

B. 40 %

C. 60 %

D. 80 %

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4

Under normal conditions using an ordinary cement, the period of removal of the form work, is:

A. 7 days for beam soffits

B. 14 days for bottom slabs of spans 4.6 m and more

C. 21 days for bottom beams over 6 m spans

D. All the above

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4

Workability improved by adding

A. Fly ash

B. Hydrated lime

C. Calcium chloride

D. All the above

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4

For given workability the grading requiring the least amount of water is one that gives

A. Greatest surface area for the given cement and aggregates

B. Least surface area for the given cement and aggregates

C. Least weight for the given cement and aggregates

D. Greatest weight for the given cement and aggregates

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4

The entrained air in concrete

A. Increases workability

B. Decreases workability

C. Decreases resistance to weathering

D. Increases strength