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Current Affairs January 2024

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4

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

Correct Answer :

A. Rounded aggregate


Related Questions

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4

Sand requiring a high water cement ratio, belongs to

A. Zone I

B. Zone II

C. Zone III

D. Zone IV

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4

Workability of concrete is inversely proportional to

A. Time of transit

B. Water-cement ratio

C. The air in the mix

D. Size of aggregate

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4

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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4

Select the incorrect statement

A. The loss of pre-stress is more in pre-tensioning system than in posttensioning system.

B. Pre-tensioning system has greater certainty about its durability.

C. For heavy loads and large spans in buildings or bridges, posttensioning system is cheaper than pre-tensioning system

D. None of the above

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4

To minimise the effect of differential settlement, the area of a footing should be designed for

A. Dead load only

B. Dead load + live load

C. Dead load + fraction of live load

D. Live load + fraction of dead load

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4

Pick up the correct statement from the following:

A. Lime in excess, causes the cement to expand and disintegrate

B. Silica in excess, causes the cement to set slowly

C. Alumina in excess, reduces the strength of the cement

D. All the above

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4

For preparing ordinary concrete, the quantity of water used, is

A. 5% by weight of aggregates plus 20% of weight of cement

B. 10% by weight of aggregates plus 10% of weight of cement

C. 5% by weight of aggregates plus 30% of weight of cement

D. 30% by weight of aggregates plus 10% of weight of cement

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4

If the depth of actual neutral axis in a beam is more than the depth of critical neutral axis, then the beam is called

A. Balanced beam

B. Under-reinforced beam

C. Over-reinforced beam

D. None of the above

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4

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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4

The minimum diameter of longitudinal bars in a column is

A. 6 mm

B. 8 mm

C. 12 mm

D. 16 mm

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4

C.R.R.I. charts are used to obtain a relationship between strength of concrete and

A. Water cement ratio

B. Workability

C. Grading of aggregate

D. Fineness modulus

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4

Diagonal tension in a beam

A. Is maximum at neutral axis

B. Decreases below the neutral axis and increases above the neutral axis

C. Increases below the neutral axis and decreases above the neutral axis

D. Remains same

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4

Pozzolana cement is used with confidence for construction of

A. Dams

B. Massive foundations

C. R.C.C. structures

D. All the above

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4

In counterfort retaining walls, the main reinforcement in the stem at support is

A. Not provided

B. Provided only on inner face

C. Provided only on front face

D. Provided both on inner and front faces

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4

Separation of coarse aggregates from mortar during transportation, is known

A. Bleeding

B. Creeping

C. Segregation

D. Shrinkage

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4

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

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4

You are asked to construct a massive dam, the type of cement you will use, is

A. Ordinary Portland cement

B. Rapid hardening cement

C. Low heat cement

D. Blast furnace slag cement

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4

Pick up the correct statement from the following:

A. The maximum size of a coarse aggregate, is 75 mm and minimum 4.75 mm

B. The maximum size of the fine aggregate, is 4.75 mm and minimum 0.075 mm

C. The material having particles of size varying from 0.06 mm to 0.002 mm, is known as silt

D. All the above

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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 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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4

The compaction of concrete, improves

A. Density

B. Strength

C. Durability

D. All the above

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4

The void ratio of

A. Single size coarse aggregate is roughly 0.45

B. Graded coarse aggregate is roughly 0.040

C. Fine aggregate is roughly 0.45

D. All the above

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4

In a spherical dome the hoop stress due to a concentrated load at crown is

A. Compressive everywhere

B. Tensile everywhere

C. Partly compressive and partly tensile

D. Zero

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4

After casting, an ordinary cement concrete on drying

A. Expands

B. Mix

C. Shrinks

D. None of these

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4

Pick up the correct statement from the following:

A. According to the petrological characteristics, concrete aggregates are classified as heavy weight, normal weight and light weight

B. According to the shape of the particles, concrete aggregates are classified as rounded irregular, angular and flaky

C. According to the surface texture of the particles, the concrete aggregates are classified as glassy, smooth, granular, rough, crystalline, honey combed and porous

D. All the above

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4

The approximate value of the ratio between direct tensile strength and flexural strength is

A. 0.33

B. 0.5

C. 0.75

D. 1.0

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4

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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4

The average permissible stress in bond for plain bars in tension is

A. Increased by 10% for bars in compression

B. Increased by 25% for bars in compression

C. Decreased by 10% for bars in compression

D. Decreased by 25% for bars in compression

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4

Pick up the incorrect statement from the following:

A. In properly graded aggregates, bulk density is more

B. In single size aggregates, bulk density is least

C. In single size aggregates, bulk density is maximum

D. None of these

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4

The minimum percentage of chemical ingredient of cement is that of

A. Magnesium oxide

B. Iron oxide

C. Alumina

D. Lime