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4

If the average compressive strength is 4000 kg/cm2 and standard deviation is 500, the co-efficient of variation is

A. 10 %

B. 12.5 %

C. 15 %

D. 18.5 %

Correct Answer :

B. 12.5 %


Related Questions

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4

The percentage of reinforcement in case of slabs, when high strength deformed bars are used is not less than

A. 0.15

B. 0.12

C. 0.30

D. 1.00

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4

Proper proportioning of concrete, ensures

A. Desired strength and workability

B. Desired durability

C. Water tightness of the structure

D. All the above

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4

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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4

While designing the pile as a column, the end conditions are nearly

A. Both ends hinged

B. Both ends fixed

C. One end fixed and other end hinged

D. One end fixed and other end free

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4

Workability of concrete mix with low water cement ratio is determined by

A. Tensile strength test

B. Slump test

C. Compaction factor test

D. Flexural strength test

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For quality control of Portland cement, the test essentially done is

A. Setting time

B. Tensile strength

C. Consistency

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

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

A T-shaped retaining wall mainly consists of

A. One cantilever

B. Two cantilevers

C. Three cantilevers

D. Four cantilevers

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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

The grade of concrete M 150 means that compressive strength of a 15 cm cube after 28 days, is

A. 100 kg/cm2

B. 150 kg/cm2

C. 200 kg/cm2

D. 250 kg/cm2

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4

The light weight aggregates are obtained from

A. Sedimentary rocks

B. Metamorphic rocks

C. Igneous rocks

D. Volcanic source

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4

Pick up the correct statement from the following:

A. Segregation is necessary for a workable concrete

B. Consistency does not affect the workability of concrete

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

D. None of these

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4

Particles of 0.002 mm size are that of

A. Clay

B. Sand

C. Gravel

D. None of these

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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

For a slab supported on its four edges with corners held down and loaded uniformly, the Marcus correction factor to the moments obtained by Grashoff Rankine's theory

A. Is always less than 1

B. Is always greater than 1

C. Can be more than 1

D. Can be less than 1

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The type of aggregates of same nominal size, which contain less voids when compacted, are

A. Rounded spherical

B. Irregular

C. Flaky

D. None of these

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If P, Y and Z are the weights of cement, fine aggregates and coarse aggregates respectively and W/C is the water cement ratio, the minimum quantity of water to be added to first batch, is obtained by the equation

A. 0.1P + 0.3Y + 0.1Z = W/C × P

B. 0.3P + 0.1Y + 0.01Z = W/C × P

C. 0.4P + 0.2Y + 0.01Z = W/C × P

D. 0.5P + 0.3Y + 0.01Z = W/C × P

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4

The specifications of a cement bag for storage, are

A. Weight 50 kg

B. Height 18 cm

C. Plan area 3000 sq. cm

D. All the above

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4

The operation of removing humps and hollows of uniform concrete surface, is known as

A. Floating

B. Screeding

C. Trowelling

D. Finishing

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4

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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4

A beam curved in plan is designed for

A. Bending moment and shear

B. Bending moment and torsion

C. Shear and torsion

D. Bending moment, shear and torsion

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Hydration of cement is due to chemical action of water with

A. Tricalcium silicate and dicalcium silicate

B. Dicalcium silicate and tricalcium aluminate

C. Tricalcium aluminate and tricalcium alumino ferrite

D. All the above

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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

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Slump test is done for

A. Clay

B. Sand

C. Lime

D. Concrete

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The purpose of reinforcement in pre-stressed concrete is

A. To provide adequate bond stress

B. To resist tensile stresses

C. To impart initial compressive stress in concrete

D. All of the above

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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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If the effective plan area of a warehouse is 54 sq. m, and maximum height of piles permitted is 270 cm, the number of cement bags to be stored, is

A. 2000 bags

B. 2200 bags

C. 2400 bags

D. 2700 bags

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4

The condition not applicable to water cement ratio law, is

A. Internal moisture conditions on hydration continue till complete strength is gained

B. Concrete specimens may be tested at any temperature

C. Concrete specimens need be of same age

D. Concrete specimens need be of same size

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4

The process of mixing, transporting, placing and compacting concrete using Ordinary Port land Cement should not take more than

A. 30 minutes

B. 40 minutes

C. 60 minutes

D. 90 minutes