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

Question

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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Select the correct statement

A. Elastic modulus of high tensile steel is nearly the same as that of mild steel

B. Elastic modulus of high tensile steel is more than that of mild steel

C. Carbon percentage in high carbon steel is less than that in mild steel

D. High tensile steel is cheaper than mild steel

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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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Particles of 0.002 mm size are that of

A. Clay

B. Sand

C. Gravel

D. None of these

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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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Separation of coarse aggregates from mortar during transportation, is known

A. Bleeding

B. Creeping

C. Segregation

D. Shrinkage

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If a grading curve is horizontal between the portions of 20 mm I.S. Sieve and 4.75 mm I.S. Sieve, the graded aggregates do not contain

A. 20 mm particles

B. 10 mm particles

C. 4.75 mm particles

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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'Ware house pack' of cement means

A. Full capacity of the ware house

B. Pressure exertion of the bags of upper layers

C. Pressure compaction of the bags on lower layers

D. Packing the ware house

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Half of the main steel in a simply supported slab is bent up near the support at a distance of x from the center of slab bearing where x is equal to (Where l is the span)

A. l/3

B. l/5

C. l/7

D. l/10

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Admixtures which cause early setting and hardening of concrete are called

A. Workability admixtures

B. Accelerators

C. Retarders

D. Air entraining agents

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If aggregates completely pass through a sieve of size 75 mm and are retained on a sieve of size 60 mm, the particular aggregate will be flaky if its minimum dimension is less than

A. 20.5 mm

B. 30.5 mm

C. 40.5 mm

D. 50.5 mm

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Permissible compressive strength of M 200 concrete grade is

A. 100 kg/cm²

B. 150 kg/cm²

C. 200 kg/cm²

D. 250 kg/cm²

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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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Pick up the incorrect statement from the following:

A. Tricalcium silicate (C3S) hydrates rapidly

B. Tricalcium silicate (C3S) generates more heat of hydration

C. Tricalcium silicate (C3S) develops early strength

D. Tricalcium silicate (C3S) has more resistance to sulphate attack

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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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The type of aggregates not suitable for high strength concrete and for pavements subjected to tension, is

A. Rounded aggregate

B. Irregular aggregate

C. Angular aggregate

D. Flaky aggregate

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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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The ratio of the length to breadth of a wooden float, is

A. 4.5

B. 5.5

C. 6.5

D. 7.5

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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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The concrete mix which causes difficulty in obtaining a smooth finish, possess

A. Segregation

B. Internal friction

C. Hardness

D. Bleeding

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According to I.S. : 456, the number of grades of concrete mixes, is

A. 3

B. 4

C. 5

D. 7

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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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Workability of concrete for a given water content is good if the aggregates, are

A. Rounded aggregate

B. Irregular aggregate

C. Angular aggregate

D. Flaky aggregates

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The aggregate containing moisture in pores and having its surface dry, is known as

A. Moist aggregates

B. Very dry aggregates

C. Dry aggregates

D. Saturated surface dry aggregate

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The main object of compaction of concrete, is:

A. To eliminate air holes

B. To achieve maximum density

C. To provide intimate contact between the concrete and embedded materials

D. All the above

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A flaky aggregate is said to be elongated if its length is

A. Equal to the mean size

B. Twice the mean size

C. Thrice the mean size

D. Four times the mean size

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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 bulk density of aggregates, is generally expressed as

A. Tonnes/cubic metre

B. kg/cubic metre

C. kg/litre

D. g/cm3

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Gypsum is added for

A. Colour

B. Strength

C. Controlling setting time

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

Discuss this answer

Accepted Answer

A. 24 to 48 hours

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

Correct Answer :

Show all Concrete Technology and Design MCQ

Related Questions

Select the correct statement

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

Particles of 0.002 mm size are that of

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

Separation of coarse aggregates from mortar during transportation, is known

If a grading curve is horizontal between the portions of 20 mm I.S. Sieve and 4.75 mm I.S. Sieve, the graded aggregates do not contain

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)

'Ware house pack' of cement means

Half of the main steel in a simply supported slab is bent up near the support at a distance of x from the center of slab bearing where x is equal to (Where l is the span)

Admixtures which cause early setting and hardening of concrete are called

If aggregates completely pass through a sieve of size 75 mm and are retained on a sieve of size 60 mm, the particular aggregate will be flaky if its minimum dimension is less than

Permissible compressive strength of M 200 concrete grade is

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

Pick up the incorrect statement from the following:

Joints in concrete structures, are provided

The type of aggregates not suitable for high strength concrete and for pavements subjected to tension, is

Pick up the correct statement from the following:

The ratio of the length to breadth of a wooden float, is

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

The concrete mix which causes difficulty in obtaining a smooth finish, possess

According to I.S. : 456, the number of grades of concrete mixes, is

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

Workability of concrete for a given water content is good if the aggregates, are

The aggregate containing moisture in pores and having its surface dry, is known as

The main object of compaction of concrete, is:

A flaky aggregate is said to be elongated if its length is

Addition of pozzolana to cement

The bulk density of aggregates, is generally expressed as

Gypsum is added for

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

Also checkout

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

Correct Answer :

Show all Concrete Technology and Design MCQ

Related Questions

Select the correct statement

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

Particles of 0.002 mm size are that of

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

Separation of coarse aggregates from mortar during transportation, is known

If a grading curve is horizontal between the portions of 20 mm I.S. Sieve and 4.75 mm I.S. Sieve, the graded aggregates do not contain

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)

'Ware house pack' of cement means

Half of the main steel in a simply supported slab is bent up near the support at a distance of x from the center of slab bearing where x is equal to (Where l is the span)

Admixtures which cause early setting and hardening of concrete are called

If aggregates completely pass through a sieve of size 75 mm and are retained on a sieve of size 60 mm, the particular aggregate will be flaky if its minimum dimension is less than

Permissible compressive strength of M 200 concrete grade is

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

Pick up the incorrect statement from the following:

Joints in concrete structures, are provided

The type of aggregates not suitable for high strength concrete and for pavements subjected to tension, is

Pick up the correct statement from the following:

The ratio of the length to breadth of a wooden float, is

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

The concrete mix which causes difficulty in obtaining a smooth finish, possess

According to I.S. : 456, the number of grades of concrete mixes, is

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

Workability of concrete for a given water content is good if the aggregates, are

The aggregate containing moisture in pores and having its surface dry, is known as

The main object of compaction of concrete, is:

A flaky aggregate is said to be elongated if its length is

Addition of pozzolana to cement

The bulk density of aggregates, is generally expressed as

Gypsum is added for

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

Also checkout

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)