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

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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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The relation between modulus of rupture f_cr, splitting strength f_cs and direct tensile strength f_cl is given by

A. f_cr - f_cs = f_cl

B. f_cr > f_cs > f_cl

C. f_cr < f_cs < f_cl

D. f_cs > f_cr > f_cl

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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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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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Sinking of an intermediate support of a continuous beam (i) Reduces the negative moment at support (ii) Increases the negative moment at support (iii) Reduces the positive moment at center of span (iv) Increases the positive moment at center of span The correct answer is

A. (i) and (iii)

B. (i) and (iv)

C. (ii) and (iii)

D. (ii) and (iv)

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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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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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The maximum amount of dust which may be permitted in aggregates is

A. 5% of the total aggregates for low workability with a coarse grading

B. 10% of the total aggregates for low workability with a fine grading

C. 20% of the total aggregates for a mix having high workability with fine grading

D. All the above

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Segregation is responsible for

A. Honey-combed concrete

B. Porous layers in concrete

C. Surface scaling in concrete

D. All the above

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The size of fine aggregates does not exceed

A. 2.75 mm

B. 3.00 mm

C. 3.75 mm

D. 4.75 mm

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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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If the permissible stress in steel in tension is 140 N/mm², then the depth of neutral axis for a singly reinforced rectangular balanced section will be

A. 0.35 d

B. 0.40 d

C. 0.45 d

D. Dependent on grade of concrete also

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The most commonly used admixture which prolongs the setting and hardening time is

A. Gypsum

B. Calcium chloride

C. Sodium silicate

D. All of the above

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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 maximum percentage of chemical ingredient of cement is that of

A. Magnesium oxide

B. Iron oxide

C. Silica

D. Lime

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The permissible diagonal tensile stress in reinforced brick work is

A. About 0.1 N/mm²

B. Zero

C. 0.3 N/mm² to 0.7 N/mm²

D. About 1.0 N/mm²

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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 effect of creep on modular ratio is

A. To decrease it

B. To increase it

C. Either to decrease or to increase it

D. To keep it unchanged

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The dimensions of a 35 litre forma for measuring aggregates by volume, are:

A. Length 30 cm, breadth 25 cm, height 30 cm

B. Length 39 cm, breadth 25 cm, height 32 cm

C. Length 27 cm, breadth 27 cm, height 48 cm

D. Length 220 cm, breadth 25 cm, height 40 cm

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Pick up the incorrect statement from the following:

A. The bottom and top ends of slump mould are parallel to each other

B. The axis of the mould is perpendicular to the end faces

C. The internal surface of the mould is kept clean and free from set cement

D. The mould is in the form of a frustum of hexagonal pyramid

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Internal friction between the ingredients of concrete, is decreased by using

A. Less water

B. Fine aggregates

C. Rich mix

D. More water and coarse aggregates

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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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After casting, an ordinary cement concrete on drying

A. Expands

B. Mix

C. Shrinks

D. None of these

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Strength of concrete increases with

A. Increase in water-cement ratio

B. Increase in fineness of cement

C. Decrease in curing time

D. Decrease in size of aggregate

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The preliminary test is repeated if the difference of compressive strength of three test specimens, exceeds

A. 5 kg/cm²

B. 8 kg/cm²

C. 10 kg/cm²

D. 15 kg/cm²

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Modulus of rupture of concrete is a measure of

A. Flexural tensile strength

B. Direct tensile strength

C. Compressive strength

D. Split tensile strength

Discuss this answer

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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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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Stress strain curve of high tensile steel

A. Has a definite yield point

B. Does not show definite yield point but yield point is defined by 0.1% proof stress

C. Does not show definite yield point but yield point is defined by 0.2% proof stress

D. Does not show definite yield point but yield point is defined by 2% proof stress,

Discuss this answer

Air entrainment in the concrete increases

A. Workability

B. Strength

C. The effects of temperature variations

D. The unit weight

Discuss this answer

Bulking of sand is

A. Mixing of different sizes of sand particles

B. Mixing of lime with sand

C. Maximum water with sand

D. Swelling of sand when wetted

Discuss this answer

Accepted Answer

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

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

Correct Answer :

Show all Concrete Technology and Design MCQ

Related Questions

The relation between modulus of rupture f_cr, splitting strength f_cs and direct tensile strength f_cl is given by

Addition of pozzolana to cement causes

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

Sinking of an intermediate support of a continuous beam (i) Reduces the negative moment at support (ii) Increases the negative moment at support (iii) Reduces the positive moment at center of span (iv) Increases the positive moment at center of span The correct answer is

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

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

The maximum amount of dust which may be permitted in aggregates is

Segregation is responsible for

The size of fine aggregates does not exceed

Ordinary Portland cement is manufactured from

If the permissible stress in steel in tension is 140 N/mm², then the depth of neutral axis for a singly reinforced rectangular balanced section will be

The most commonly used admixture which prolongs the setting and hardening time is

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

The maximum percentage of chemical ingredient of cement is that of

The permissible diagonal tensile stress in reinforced brick work is

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

The effect of creep on modular ratio is

The dimensions of a 35 litre forma for measuring aggregates by volume, are:

Pick up the incorrect statement from the following:

Internal friction between the ingredients of concrete, is decreased by using

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)

After casting, an ordinary cement concrete on drying

Strength of concrete increases with

The preliminary test is repeated if the difference of compressive strength of three test specimens, exceeds

Modulus of rupture of concrete is a measure of

For a good concrete

Higher workability of concrete is required if the structure is

Stress strain curve of high tensile steel

Air entrainment in the concrete increases

Bulking of sand is

Also checkout

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

Correct Answer :

Show all Concrete Technology and Design MCQ

Related Questions

The relation between modulus of rupture fcr, splitting strength fcs and direct tensile strength fcl is given by

Addition of pozzolana to cement causes

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

Sinking of an intermediate support of a continuous beam (i) Reduces the negative moment at support (ii) Increases the negative moment at support (iii) Reduces the positive moment at center of span (iv) Increases the positive moment at center of span The correct answer is

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

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

The maximum amount of dust which may be permitted in aggregates is

Segregation is responsible for

The size of fine aggregates does not exceed

Ordinary Portland cement is manufactured from

If the permissible stress in steel in tension is 140 N/mm², then the depth of neutral axis for a singly reinforced rectangular balanced section will be

The most commonly used admixture which prolongs the setting and hardening time is

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

The maximum percentage of chemical ingredient of cement is that of

The permissible diagonal tensile stress in reinforced brick work is

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

The effect of creep on modular ratio is

The dimensions of a 35 litre forma for measuring aggregates by volume, are:

Pick up the incorrect statement from the following:

Internal friction between the ingredients of concrete, is decreased by using

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)

After casting, an ordinary cement concrete on drying

Strength of concrete increases with

The preliminary test is repeated if the difference of compressive strength of three test specimens, exceeds

Modulus of rupture of concrete is a measure of

For a good concrete

Higher workability of concrete is required if the structure is

Stress strain curve of high tensile steel

Air entrainment in the concrete increases

Bulking of sand is

Also checkout

The relation between modulus of rupture f_cr, splitting strength f_cs and direct tensile strength f_cl is given by

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)