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4

The cement becomes useless if its absorbed moisture content exceeds

A. 1 %

B. 2 %

C. 3 %

D. 5 %

Correct Answer :

D. 5 %


Related Questions

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4

The final operation of finishing floors, is known as

A. Screeding

B. Floating

C. Trowelling

D. Finishing

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4

Di-calcium silicate (C2S)

A. Hydrates rapidly

B. Generates less heat of hydration

C. Hardens rapidly

D. Provides less ultimate strength to cement

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4

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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4

Pozzolanic properties exist in

A. Shales

B. Fly ash

C. Pumicite

D. All the above

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4

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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4

Which of the following R.C. retaining walls is suitable for heights beyond 6 m?

A. L-shaped wall

B. T-shaped wall

C. Counterfort type

D. All of the above

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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

Permissible compressive strength of M 150 concrete grade is

A. 100 kg/cm2

B. 150 kg/cm2

C. 200 kg/cm2

D. 250 kg/cm2

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4

In the design of a front counterfort in a counterfort retaining wall, the main reinforcement is provided on (i) Bottom face near counterfort (ii) Top face near counterfort (iii) Bottom face near centre of span (iv) Top face near centre of span The correct answer is

A. Only (i)

B. Only (ii)

C. Both (i) and (iv)

D. Both (ii) and (iii)

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4

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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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

Ordinary concrete is not used for concrete grade

A. M 100

B. M 150

C. M 250

D. M 400

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4

Approximate value of shrinkage strain in concrete, is

A. 0.003

B. 0.0003

C. 0.00003

D. 0.03

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4

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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4

Pick up the correct statement from the following:

A. Higher workability indicates unexpected increase in the moisture content

B. Higher workability indicates deficiency of sand

C. If the concrete mix is dry, the slump is zero

D. All the above

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4

While designing an air entrained concrete

A. Water cement ratio is reduced

B. Proportion of aggregates is reduced

C. An allowance for the entrained air is made

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

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

Concrete mainly consists of

A. Cement

B. Aggregates

C. Water

D. All the above

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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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4

Pick up the correct statement from the following:

A. The free water is the amount of water added while mixing and the amount of water held on the surface of the aggregates prior to mixing

B. The total water is the free water and the amount actually absorbed by the aggregates

C. Neither (a) nor (b)

D. Both (a) and (b)

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4

If the various concrete ingredients i.e. cement, sand and aggregates are in the ratio of 1:3:6, the grade of concrete, is

A. M 100

B. M 150

C. M 200

D. M 250

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4

Assertion A : The load factor for live load is greater than that for dead load. Reason R : The live loads are more uncertain than dead loads. Select your answer based on the coding system given below:

A. Both A and R is true and R is the correct explanation of A

B. Both A and R is true but R is not the correct explanation of A

C. A is true but R is false

D. A is false but R is true

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4

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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4

Shrinkage of concrete depends upon
(i) Humidity of atmosphere
(ii) Passage of time
(iii) Stress The correct answer is

A. (i) and (ii)

B. (ii) and (iii)

C. Only (iii)

D. All (i), (ii) and (iii)

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4

Pick up the correct statement from the following:

A. Sand obtained from pits, is washed to remove clay and silt

B. Sand obtained from flooded pits, need not be washed before use

C. The chloride in sea shore sand and shingle may cause corrosion of reinforcement if the concrete is porous

D. All the above

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4

To prevent segregation, the maximum height for placing concrete, is

A. 100 cm

B. 125 cm

C. 150 cm

D. 200 cm

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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 diameter of ties in a column should be

A. More than or equal to one fourth of diameter of main bar

B. More than or equal to 5 mm

C. More than 5 mm but less than one-fourth of diameter of main bar

D. More than 5 mm and also more than one-fourth of diameter of main bar

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4

Workability improved by adding

A. Air-entraining agent

B. Foaming agent

C. Oily-agent

D. All the above