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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

Correct Answer :

A. Rounded


Related Questions

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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

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

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

Examine the following statements: (i) Factor of safety for steel should be based on its yield stress, (ii) Factor of safety for steel should be based on its ultimate stress, (iii) Factor of safety for concrete should be based on its yield stress, (iv) Factor of safety for concrete should be based on its ultimate stress. The correct statements are

A. (i) and (iii)

B. (i) and (iv)

C. (ii) and (iii)

D. (ii) and (iv)

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4

Pick up the incorrect statement from the following. For performing compressive strength test of cement

A. Cement and standard sand mortar are used in the ratio of 1 : 3

B. Water is added at the rate of (P/4) + 3.0 percentage of water where P is the percentage of water for standard consistency

C. A cube mould of 10 cm × 10 cm × 10 cm is used

D. The prepared moulds are kept in a atmosphere of 50% relative humidity

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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

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

If the engineer-in-charge approves, the 10 cm cubes may be used for the work test of concrete provided maximum nominal size of aggregate, does not exceed

A. 10 cm

B. 15 cm

C. 20 cm

D. 25 cm

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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

For concreting of heavily reinforced sections without vibration, the workability of concrete expressed as compacting factor should be

A. 0.75 - 0.80

B. 0.80 - 0.85

C. 0.85 - 0.92

D. Above 0.92

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4

Maximum percentage reinforcement in case of slabs is limited to

A. 2

B. 4

C. 6

D. 8

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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

Increase in the moisture content in concrete

A. Reduces the strength

B. Increases the strength

C. Does not change the strength

D. All of the above

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4

To hydrate 500kg of cement full water needed, is

A. 100 kg

B. 110 kg

C. 120 kg

D. 130 kg

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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

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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

'Ware house pack' of cement means

A. Full capacity of the ware house

B. Pressure exertion of the bags of upper layers

C. Pressure compaction of the bags on lower layers

D. Packing the ware house

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4

The ratio of various ingredients (cement, sand, aggregates) in concrete of grade M 200, is

A. 1 : 2 : 4

B. 1 : 3 : 6

C. 1 : 1 ½ : 3

D. 1 : 1 : 2

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4

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 maximum value of hoop compression in a dome is given by

A. wR / 4d

B. wR/2d

C. wR/d

D. 2wR/d Where, w = load per unit area of surface of dome R = radius of curvature d = thickness of dome

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4

For an ordinary Portland cement

A. Residual does not exceed 10% when sieved through IS Sieve No. 9

B. Soundness varies from 5 to 10 mm

C. Initial setting time is not less than 30 minutes

D. Compressive stress after 7 days, is not less than 175 kg/cm2

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4

In slump test, each layer of concrete is compacted by a steel rod 60 cm long and of 16 mm diameter for

A. 20 times

B. 25 times

C. 30 times

D. 50 times

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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

Bulking of sand is maximum if moisture content is about

A. 2 %

B. 4 %

C. 6 %

D. 10 %

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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

High temperature

A. Increases the strength of concrete

B. Decreases the strength of concrete

C. Has no effect on the strength of concrete

D. None of these

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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

A higher modular ratio shows

A. Higher compressive strength of concrete

B. Lower compressive strength of concrete

C. Higher tensile strength of steel

D. Lower tensile strength of steel

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4

In working stress design, permissible bond stress in the case of deformed bars is more than that in plain bars by

A. 10 %

B. 20 %

C. 30 %

D. 40 %