Concrete is unsuitable for compaction by a vibrator if it is

Question

Concrete is unsuitable for compaction by a vibrator if it is

A. Dry

B. Earth moist

C. Semi-plastic

D. Plastic

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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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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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For the construction of cement concrete floor, the maximum permissible size of aggregate, is

A. 4 mm

B. 6 mm

C. 8 mm

D. 10 mm

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The temperature reinforcement in the vertical slab of a T-shaped R.C. retaining wall is

A. Not needed

B. Provided equally on inner and front faces

C. Provided more on inner face than on front face

D. Provided more on front face than on inner face

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The individual variation between test strength of sample should not be more than

A. ± 5 % of average

B. ± 10 % of average

C. ± 15 % of average

D. ± 20 % of average

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Ratio of permissible stress in direct compression and bending compression is

A. Less than 1

B. Between 1 and 1.5

C. Between 1.5 and 2.0

D. Greater than 2

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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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Higher workability of concrete is required if the structure is

A. Made with cement concrete

B. Thick and reinforced

C. Thin and heavily reinforced

D. Thick and heavily reinforced

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The process of mixing, transporting, placing and compacting concrete using Ordinary Port land Cement should not take more than

A. 30 minutes

B. 40 minutes

C. 60 minutes

D. 90 minutes

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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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Addition of pozzolana to cement

A. Decreases workability

B. Increases strength

C. Increases heat of hydration

D. None of these

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The factor which affects workability, is

A. Water content and its temperature

B. Shape and size of the aggregates

C. Air entraining agents

D. All the above

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The strength and quality of concrete, depend upon:

A. Grading of aggregates

B. Surface area of aggregates

C. Shape of aggregates

D. All the above

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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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The produce impermeable concrete

A. Thorough mixing of concrete is required

B. Proper compaction of concrete is required

C. Proper curing of concrete is required

D. All the above

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Addition of pozzolana to ordinary port land cement, causes

A. Decrease in early strength

B. Reduction in chemical action with sulphates

C. Increase in shrinkage

D. All the above

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The condition not applicable to water cement ratio law, is

A. Internal moisture conditions on hydration continue till complete strength is gained

B. Concrete specimens may be tested at any temperature

C. Concrete specimens need be of same age

D. Concrete specimens need be of same size

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The main reinforcement in the heel of a T-shaped R.C. retaining wall is provided on

A. Top face perpendicular to wall

B. Bottom face perpendicular to wall

C. Both top and bottom faces perpendicular to wall

D. None of the above

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The light weight aggregates are obtained from

A. Sedimentary rocks

B. Metamorphic rocks

C. Igneous rocks

D. Volcanic source

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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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According to the recommendations of IS : 456-1978, the expansion joints

A. Are provided where plane changes abruptly

B. Are provided to ensure minimum resistance

C. Do not carry reinforcement across them

D. All the above

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The centroid of compressive force, from the extreme compression fiber, in limit state design lies at a distance of (Where x_u is the depth of neutral axis at the limit state of collapse)

A. 0.367 x_u

B. 0.416 x_u

C. 0.446 x_u

D. 0.573 x_u

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If 1500 g of water is required to have a cement paste 1875 g of normal consistency, the percentage of water is,

A. 20 %

B. 25 %

C. 30 %

D. 35 %

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If the storey height is equal to length of RCC wall, the percentage increase in strength is

A. 0

B. 10

C. 20

D. 30

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In a pile of length l, the points of suspension from ends for lifting it are located at

A. 0.207 l

B. 0.25 l

C. 0.293 l

D. 0.333 l

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The final operation of finishing floors, is known as

A. Screeding

B. Floating

C. Trowelling

D. Finishing

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The most useless aggregate is one whose surface texture is

A. Smooth

B. Granular

C. Glassy

D. Honey combed and porous

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For construction of structures in sea water, the cement generally preferred to, is

A. Portland-pozzolana cement

B. Quick setting cement

C. Low heat Portland cement

D. Rapid hardening cement

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In working stress design, permissible bond stress in the case of deformed bars is more than that in plain bars by

A. 10 %

B. 20 %

C. 30 %

D. 40 %

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The rock which is not calcareous, is:

A. Lime stone

B. Chalk

C. Laterite

D. None of these

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Accepted Answer

D. Plastic

Concrete is unsuitable for compaction by a vibrator if it is

Correct Answer :

Show all Concrete Technology and Design MCQ

Related Questions

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

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

For the construction of cement concrete floor, the maximum permissible size of aggregate, is

The temperature reinforcement in the vertical slab of a T-shaped R.C. retaining wall is

The individual variation between test strength of sample should not be more than

Ratio of permissible stress in direct compression and bending compression is

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

Higher workability of concrete is required if the structure is

The process of mixing, transporting, placing and compacting concrete using Ordinary Port land Cement should not take more than

M10 grade of concrete approximates

Addition of pozzolana to cement

The factor which affects workability, is

The strength and quality of concrete, depend upon:

Tricalcium aluminate (C₃A)

The produce impermeable concrete

Addition of pozzolana to ordinary port land cement, causes

The condition not applicable to water cement ratio law, is

The main reinforcement in the heel of a T-shaped R.C. retaining wall is provided on

The light weight aggregates are obtained from

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

According to the recommendations of IS : 456-1978, the expansion joints

The centroid of compressive force, from the extreme compression fiber, in limit state design lies at a distance of (Where x_u is the depth of neutral axis at the limit state of collapse)

If 1500 g of water is required to have a cement paste 1875 g of normal consistency, the percentage of water is,

If the storey height is equal to length of RCC wall, the percentage increase in strength is

In a pile of length l, the points of suspension from ends for lifting it are located at

The final operation of finishing floors, is known as

The most useless aggregate is one whose surface texture is

For construction of structures in sea water, the cement generally preferred to, is

In working stress design, permissible bond stress in the case of deformed bars is more than that in plain bars by

The rock which is not calcareous, is:

Also checkout

Concrete is unsuitable for compaction by a vibrator if it is

Correct Answer :

Show all Concrete Technology and Design MCQ

Related Questions

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

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

For the construction of cement concrete floor, the maximum permissible size of aggregate, is

The temperature reinforcement in the vertical slab of a T-shaped R.C. retaining wall is

The individual variation between test strength of sample should not be more than

Ratio of permissible stress in direct compression and bending compression is

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

Higher workability of concrete is required if the structure is

The process of mixing, transporting, placing and compacting concrete using Ordinary Port land Cement should not take more than

M10 grade of concrete approximates

Addition of pozzolana to cement

The factor which affects workability, is

The strength and quality of concrete, depend upon:

Tricalcium aluminate (C3A)

The produce impermeable concrete

Addition of pozzolana to ordinary port land cement, causes

The condition not applicable to water cement ratio law, is

The main reinforcement in the heel of a T-shaped R.C. retaining wall is provided on

The light weight aggregates are obtained from

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

According to the recommendations of IS : 456-1978, the expansion joints

The centroid of compressive force, from the extreme compression fiber, in limit state design lies at a distance of (Where xu is the depth of neutral axis at the limit state of collapse)

If 1500 g of water is required to have a cement paste 1875 g of normal consistency, the percentage of water is,

If the storey height is equal to length of RCC wall, the percentage increase in strength is

In a pile of length l, the points of suspension from ends for lifting it are located at

The final operation of finishing floors, is known as

The most useless aggregate is one whose surface texture is

For construction of structures in sea water, the cement generally preferred to, is

In working stress design, permissible bond stress in the case of deformed bars is more than that in plain bars by

The rock which is not calcareous, is:

Also checkout

Tricalcium aluminate (C₃A)

The centroid of compressive force, from the extreme compression fiber, in limit state design lies at a distance of (Where x_u is the depth of neutral axis at the limit state of collapse)