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What is the correct answer?

4

Strength of concrete increases with

A. Increase in water-cement ratio

B. Increase in fineness of cement

C. Decrease in curing time

D. Decrease in size of aggregate

Correct Answer :

B. Increase in fineness of cement


Related Questions

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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

Slump test of concrete is a measure of its

A. Consistency

B. Compressive strength

C. Tensile strength

D. Impact value

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4

Pick up the correct statement from the following:

A. Bulking of sand is caused due to formation of a thin film of surface moisture

B. Fine sand bulks more than coarse sand

C. The volume of fully saturated sand, is equal to the volume of dry and loose sand

D. All the above

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4

Pick up the incorrect statement from the following:

A. Space between the exterior walls of a warehouse and bag piles should be 30 cm

B. Cement bags should preferably be piled on wooden planks

C. Width and height of the pile should not exceed 3 m and 2.70 m respectively

D. None of these

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4

Curing a concrete for long period ensures better

A. Volume stability

B. Strength

C. Water resistance

D. All the above

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4

A continuous beam is deemed to be a deep beam when the ratio of effective span to overall depth (1/D) is less than

A. 1.5

B. 2.0

C. 2.5

D. 3.0

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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

If the effective working time is 7 hours and per batch time of concrete is 3 minutes, the output of a concrete mixer of 150 litre capacity, is

A. 15,900 litres

B. 16,900 litres

C. 17,900 litres

D. 18,900 litres

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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

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

Modulus of rupture of concrete is a measure of

A. Flexural tensile strength

B. Direct tensile strength

C. Compressive strength

D. Split tensile strength

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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

Which of the following statements is incorrect?

A. Minimum cross sectional area of longitudinal reinforcement in a column is 0.8%

B. Spacing of longitudinal bars measured along the periphery of column should not exceed 300 mm

C. Reinforcing bars in a column should not be less than 12 mm in diameter

D. The number of longitudinal bars provided in a circular column should not be less than four

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4

Addition of pozzolana to ordinary port land cement, causes

A. Decrease in early strength

B. Reduction in chemical action with sulphates

C. Increase in shrinkage

D. All the above

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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

If the foundations of all the columns of a structure are designed on the total live and dead load basis, then

A. There will be no settlement of columns

B. There will be no differential settlement

C. The settlement of exterior columns will be more than interior columns

D. The settlement of interior columns will be more than exterior columns

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4

The slab is designed as one way if the ratio of long span to short span is

A. Less than 1

B. Between 1 and 1.5

C. Between 1.5 and 2

D. Greater than 2

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4

For a longitudinal reinforcing bar in a column, the minimum cover shall neither be less than the diameter of bar nor less than

A. 15 mm

B. 25 mm

C. 30 mm

D. 40 mm

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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

The commercial name of white and coloured cement in India, is

A. Colorcrete

B. Silvicrete

C. Snowcem

D. All the above

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4

The main object of compaction of concrete, is:

A. To eliminate air holes

B. To achieve maximum density

C. To provide intimate contact between the concrete and embedded materials

D. All the above

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4

Pick up the incorrect statement from the following:

A. Admixtures accelerate hydration

B. Admixtures make concrete water proof

C. Admixtures make concrete acid proof

D. Admixtures give high strength

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4

According to ISI recommendations, the maximum depth of stress block for balanced section of a beam of effective depth d is

A. 0.43 d

B. 0.55 d

C. 0.68 d

D. 0.85 d

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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

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

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

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

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

While compacting the concrete by a mechanical vibrator, the slump should not exceed

A. 2.5 cm

B. 5.0 cm

C. 7.5 cm

D. 10 cm

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4

Pick up the correct statement from the following:

A. Construction joints in columns are provided a few cm below the junction of beam

B. Construction joints in columns are provided at the bottom hunching

C. Construction joints in beams and slabs are provided within middle third

D. All the above