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Current Affairs January 2024

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4

Non-uniform compaction may cause the concrete

A. Porous

B. Non-homogeneous

C. Reduced strength

D. All the above

Correct Answer :

D. All the above


Related Questions

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4

In a counterfort retaining wall, the main reinforcement is provided on the (i) Bottom face in front counterfort (ii) Inclined face in front counterfort (iii) Bottom face in back counterfort (iv) Inclined face in back counterfort The correct answer is

A. (i) and (ii),

B. (ii) and (iii)

C. (i) and (iv)

D. (iii) and (iv)

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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

Pick up the correct statement from the following:

A. Water enables chemical reaction to take place with cement

B. Water lubricates the mixture of gravel, sand and cement

C. Strength of concrete structure largely depends upon its workability

D. All the above

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4

Pick up the correct statement from the following:

A. Insufficient quantity of water makes the concrete mix harsh

B. Insufficient quantity of water makes the concrete unworkable

C. Excess quantity of water makes the concrete segregated

D. All the above

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4

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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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

A continuous beam is deemed to be a deep beam when the ratio of effective span to overall depth (1/D) is less than

A. 1.5

B. 2.0

C. 2.5

D. 3.0

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4

The commonly used material in the manufacture of cement is

A. Sand stone

B. Slate

C. Lime stone

D. Graphite

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4

Pick up the correct statement from the following:

A. The quality of water governs the strength of concrete

B. 10% excess of water reduces the strength of concrete by 15%

C. 30% excess of water reduces the strength of concrete by 50%

D. All the above

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4

Pick up the correct statement from the following:

A. High percentage of C3S and low percentage of C2S cause rapid hardening

B. High percentage of C3S and low percentage of C2S make the cement less resistive to chemical attack

C. Low percentage of C3S and high percentage of C2S contribute to slow hardening

D. All the above

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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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4

Cube strength of controlled concrete to be used for pre-tensioned and post-tensioned work respectively should not be less than

A. 35 MPa and 42 MPa

B. 42 MPa and 35 MPa

C. 42 MPa and 53 MPa

D. 53 MPa and 42 MPa

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4

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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4

Poisson's ratio for concrete

A. Remains constant

B. Increases with richer mixes

C. Decreases with richer mixes

D. None of the above

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4

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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4

The commercial name of white and coloured cement in India, is

A. Colorcrete

B. Silvicrete

C. Snowcem

D. All the above

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4

Batching error means inaccuracy in the quantity of

A. Aggregates

B. Cement

C. Water

D. All the above

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4

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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4

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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4

For batching 1:3:6 concrete mix by volume, the ingredients required per bag of 50 kg cement, are:

A. 70 litres of sand and 120 litres of aggregates

B. 70 kg of sand and 140 litres of aggregates

C. 105 litres of sand and 140 litres of aggregates

D. 105 litres of sand and 210 litres of aggregates

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4

The limits of percentage p of the longitudinal reinforcement in a column is given by

A. 0.15% to 2%

B. 0.8% to 4%

C. 0.8% to 6%

D. 0.8% to 8%

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4

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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4

Vicat apparatus is used for

A. Fineness test

B. Consistency test

C. Test for setting time

D. Test for tensile strength

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4

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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4

For ensuring quality of concrete, use

A. Single sized aggregates

B. Two sized aggregate

C. Graded aggregates

D. Coarse aggregates

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4

Normally pre-stressing wires are arranged in the

A. Upper part of the beam

B. Lower part of the beam

C. Center

D. Anywhere

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4

For road pavements, the cement generally used, is

A. Ordinary Portland cement

B. Rapid hardening cement

C. Low heat cement

D. Blast furnace slag cement

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4

The bulk density of aggregates does not depend upon:

A. Size and shape of aggregates

B. Specific gravity of aggregates

C. Grading of aggregates

D. Size and shape of the container

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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

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4

The strength of concrete after one year as compared to 28 days strength is about

A. 10 to 15% more

B. 15 to 20% more

C. 20 to 25% more

D. 25 to 50% more