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What is the correct answer?

4

A concrete using an air entrained cement

A. Has strength less than 10% to 15%

B. Has more resistance to weathering

C. Is more plastic and workable

D. Is free from segregation and bleeding

Correct Answer :

C. Is more plastic and workable


Related Questions

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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

The main reinforcement in the heel of a T-shaped R.C. retaining wall is provided on

A. Top face perpendicular to wall

B. Bottom face perpendicular to wall

C. Both top and bottom faces perpendicular to wall

D. None of the above

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4

Pick up the correct statement from the following:

A. Construction joints are necessarily planned for their locations

B. Expansion joints are provided to accommodate thermal expansion

C. Construction joints are provided to control shrinkage cracks

D. All the above

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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

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

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

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

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

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

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

In T-shaped R C. retaining walls, the main reinforcement in the stem is provided on

A. The front face in one direction

B. The front face in both directions

C. The inner face in one direction

D. The inner face in both directions

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4

For compacting plain concrete road surface of thickness less than 20 cm, we use

A. Internal vibrator

B. Screed vibrator

C. Form vibrator

D. None of these

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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 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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4

M10 grade of concrete approximates

A. 1 : 3 : 6 mix

B. 1 : 1 : 2 mix

C. 1 : 2 : 4 mix

D. 1 : 1.5 : 3 mix

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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

The minimum cover to the ties or spirals should not be less than

A. 15 mm

B. 20 mm

C. 25 mm

D. 50 mm

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4

Pick up the correct statement from the following:

A. An increase in water content must be accompanied by an increase in cement content

B. Angular and rough aggregates reduce the workability of the concrete

C. The slump of the concrete mix decreases due to an increase in temperature

D. All the above

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4

The individual variation between test strength of sample should not be more than

A. ± 5 % of average

B. ± 10 % of average

C. ± 15 % of average

D. ± 20 % of average

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4

The datum temperature for maturity by Plowman, is

A. 23°C

B.

C. - 5.6°C

D. - 11.7°C

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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

The final operation of finishing floors, is known as

A. Screeding

B. Floating

C. Trowelling

D. Finishing

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4

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

The depth of footing for an isolated column is governed by (i) Maximum bending moment (ii) Shear force (iii) Punching shear The correct answer is

A. Only (i)

B. (i) and (ii)

C. (i) and (iii)

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

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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

For given water content, workability decreases if the concrete aggregates contain an excess of

A. Thin particles

B. Flat particles

C. Elongated particles

D. All the above

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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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4

Water cement ratio is generally expressed in volume of water required per

A. 10 kg

B. 20 kg

C. 30 kg

D. 50 kg

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4

The property of the ingredients to separate from each other while placing the concrete is called

A. Segregation

B. Compaction

C. Shrinkage

D. Bulking

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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