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4

Increase in the moisture content in concrete

A. Reduces the strength

B. Increases the strength

C. Does not change the strength

D. All of the above

Correct Answer :

A. Reduces the strength


Related Questions

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Bulking of sand is maximum if moisture content is about

A. 2 %

B. 4 %

C. 6 %

D. 10 %

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4

The risk of segregation is more for

A. Wetter mix

B. Larger proportion of maximum size aggregate

C. Coarser grading

D. All the above

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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

The type of aggregates of same nominal size, which contain less voids when compacted, are

A. Rounded spherical

B. Irregular

C. Flaky

D. None of these

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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

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4

According to IS: 4561978, minimum slenderness ratio for a short column is

A. Less than 12

B. Less than 18

C. Between 18 and 24

D. More than 24

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4

Joints in concrete structures, are provided

A. To reduce the tensile stresses likely to be developed due to evaporation of water

B. To minimise the change in the dimensions of the slab

C. To minimise the necessary cracking

D. All the above

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4

The main reinforcement in the toe of a T-shaped R C. retaining wall is provided on
(i) Top face parallel to the wall
(ii) Top face perpendicular to the wall
(iii) Bottom face parallel to the wall
(iv) Bottom face perpendicular to the wall The correct answer is

A. Only (ii) is correct

B. (i) and (ii) are correct

C. (iii) and (iv) are correct

D. Only (iv) is correct

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4

To obtain cement dry powder, lime stones and shales or their slurry, is burnt in a rotary kiln at a temperature between

A. 1100° and 1200°C

B. 1200° and 1300°C

C. 1300° and 1400°C

D. 1400° and 1500°C

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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

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

If the effective working time is 7 hours and per batch time of concrete is 3 minutes, the output of a concrete mixer of 150 litre capacity, is

A. 15,900 litres

B. 16,900 litres

C. 17,900 litres

D. 18,900 litres

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4

For a cantilever of effective depth of 0.5 m, the maximum span to satisfy vertical deflection limit is

A. 3.5 m

B. 4 m

C. 4.5 m

D. 5 m

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4

If a beam fails in bond, then its bond strength can be increased most economically by

A. Increasing the depth of beam

B. Using thinner bars but more in number

C. Using thicker bars but less in number

D. Providing vertical stirrups

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4

For walls, columns and vertical faces of all structural members, the form work is generally removed after

A. 24 to 48 hours

B. 3 days

C. 7 days

D. 14 days

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4

Pick up the correct statement from the following:

A. Construction joints in columns are provided a few cm below the junction of beam

B. Construction joints in columns are provided at the bottom hunching

C. Construction joints in beams and slabs are provided within middle third

D. All the above

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4

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

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4

The percentage of the aggregate of F.M. 2.6 to be combined with coarse aggregate of F.M. 6.8 for obtaining the aggregates of F.M. 5.4, is

A. 30 %

B. 40 %

C. 50 %

D. 60 %

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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

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

Hardening of cement occurs at

A. Rapid rate during the first few days and afterwards it continues to increase at a decreased rate

B. Slow rate during the first few days and afterwards it continues to increase at a rapid rate

C. Uniform rate throughout its age

D. None of these

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4

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

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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

Curing of pavements, floors, roofs and slabs, is done by

A. Membrane method

B. Ponding method

C. Covering surface with bags

D. Sprinkling water method

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Construction joints are provided

A. Where B.M. and S.F. are small

B. Where the member is supported by other member

C. At 18 m apart in huge structures

D. All the above

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4

Pick up the correct statement from the following:

A. Calcium chloride acts as a retarder

B. Calcium chloride acts as an accelerator

C. Gypsum (calcium sulphate) acts as a retarder

D. Both (b) and (c)

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4

According to Whitney's theory, ultimate strain of concrete is assumed to be

A. 0.03 %

B. 0.1 %

C. 0.3 %

D. 3 %

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4

Modulus of elasticity of steel as per IS: 4561978 shall be taken as

A. 20 kN/cm²

B. 200 kN/cm²

C. 200 kN/mm²

D. 2 × 106 N/cm²

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4

The cement whose strength is a little lower than the ordinary cement during the first three months but attains afterwards the same strength, is known as

A. Low-heat Portland cement

B. Rapid hardening Portland cement

C. Portland blast slag cement

D. Portland pozzolana cement

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4

The design yield stress of steel according to IS: 4561978 is: (Where fy is the characteristic yield strength of steel)

A. 0.37 fy

B. 0.57 fy

C. 0.67 fy

D. 0.87 fy