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4

If X, Y and Z are the fineness modulli of coarse, fine and combined aggregates, the percentage (P) of fine aggregates to combined aggregates, is

A. P = [(Z - X)/(Z - Y)] × 100

B. P = [(X - Z)/(Z - Y)] × 100

C. P = [(X - Z)/(Z + Y)] × 100

D. P = [(Z + X)/(Z - Y)] × 100

Correct Answer :

B. P = [(X - Z)/(Z - Y)] × 100


Related Questions

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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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To obtain a very high strength concrete, use very fine grained

A. Granite

B. Magnetite

C. Barite

D. Volcanic scoria

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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

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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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

Workability of concrete is directly proportional to

A. Aggregate cement ratio

B. Time of transit

C. Grading of the aggregate

D. All of above

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4

According to Whitney's theory, depth of stress block for a balanced section of a concrete beam is limited to

A. 0.43 d

B. 0.537 d

C. 0.68 d

D. 0.85 d Where d is effective depth of beam

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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

The critical section for finding maximum bending moment for footing under masonry wall is located

A. At the middle of the wall

B. At the edge of the wall

C. Halfway between the middle and edge of the wall

D. At a distance equal to effective depth of footing from the edge of the wall

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4

An aggregate is known as cyclopean aggregate if its size is more than

A. 4.75 mm

B. 30 mm

C. 60 mm

D. 75 mm

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4

If 1500 g of water is required to have a cement paste 1875 g of normal consistency, the percentage of water is,

A. 20 %

B. 25 %

C. 30 %

D. 35 %

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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

A construction joint is provided where

A. Bending moment is small

B. Shear force is small

C. The member is supported by other member

D. All the above

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4

The aggregate impact value of the aggregate used in

A. Building concrete is less than 45

B. Road pavement concrete is less than 30

C. Runway concrete is less than 30

D. All the above

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4

If a grading curve is horizontal between the portions of 20 mm I.S. Sieve and 4.75 mm I.S. Sieve, the graded aggregates do not contain

A. 20 mm particles

B. 10 mm particles

C. 4.75 mm particles

D. All the above

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4

Pick up the correct statement from the following:

A. Water cement paste hardens due to hydration

B. During hardening cement binds the aggregates together

C. Cement provides strength, durability and water tightness to the concrete

D. All the above

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4

Pick up the correct statement from the following:

A. A highly absorptive aggregate reduces the workability of concrete considerably

B. The specific gravity of aggregate is important for the determination of the moisture content

C. The absorption and porosity of an aggregate influence the property of the concrete

D. All the above

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4

In a ring beam subjected to uniformly distributed load (i) Shear force at mid span is zero (ii) Shear force at mid span is maximum (iii) Torsion at mid span is zero (iv) Torsion at mid span is maximum 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

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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4

Specified compressive strength of concrete is obtained from cube tests at the end of

A. 3 days

B. 7 days

C. 21 days

D. 28 days

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4

In order to obtain the best workability of concrete, the preferred shape of aggregate is

A. Rounded

B. Elongated

C. Angular

D. All of the above

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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

The bulk density of aggregates, depends upon

A. Shape

B. Grading

C. Compaction

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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4

The shrinkage of concrete

A. Is proportional to water content is the mix

B. Is proportional to cement concrete

C. Increases with age of concrete

D. All the above

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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 cement whose strength is a little lower than the ordinary cement during the first three months but attains afterwards the same strength, is known as

A. Low-heat Portland cement

B. Rapid hardening Portland cement

C. Portland blast slag cement

D. Portland pozzolana cement

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4

If 50 kg of fine aggregates and 100 kg of coarse aggregates are mixed in a concrete whose water cement ratio is 0.6, the weight of water required for harsh mix, is

A. 8 kg

B. 10 kg

C. 12 kg

D. 14 kg

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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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Le-Chatelier's apparatus is used for testing

A. Soundness of cement

B. Hardness of cement

C. Strength of cement

D. Durability of cement