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

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
by

1 Answer

Answer :

Answer: Option D
by

Related questions

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The basic purpose of a retarder in concrete is (A) To increase the initial setting time of cement paste in concrete (B) To decrease the initial setting time of cement paste in concrete (C) To render the concrete more water tight (D) To improve the workability of concrete mix

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Workability of concrete is inversely proportional to (A) Time of transit (B) water-cement ratio (C) The air in the mix (D) Size of aggregate

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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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For batching 1:3:6 concrete mix by volume, the ingredients required per bag of 50 kg cement, are: (A) 70 litres of sand and 120 litres of aggregates (B) 70 kg of sand and 140 litres of aggregates (C) 105 litres of sand and 140 litres of aggregates (D) 105 litres of sand and 210 litres of aggregates

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The factor which affects workability, is (A) Water content and its temperature (B) Shape and size of the aggregates (C) Air entraining agents (D) All the above

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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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The maximum amount of dust which may be permitted in aggregates is (A) 5% of the total aggregates for low workability with a coarse grading (B) 10% of the total aggregates for low workability with a fine grading (C) 20% of the total aggregates for a mix having high workability with fine grading (D) All the above

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The workability of concrete is mostly influenced by its [ A ] Water cement ratio [ B ] Aggregate cement ratio [ C ] Cement content [ D ] Water content

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For given workability the grading requiring the least amount of water is one that gives (A) Greatest surface area for the given cement and aggregates (B) Least surface area for the given cement and aggregates (C) Least weight for the given cement and aggregates (D) Greatest weight for the given cement and aggregates

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Pick up the correct statement from the following: (A) The rise of the ground surface due to frost action is called frost heave (B) The freezing of water is accompanied by a volume increase of 9% (C) Below freezing point, higher soil suction develops (D) All the above

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Explain the procedure for measurement of workability of fresh concrete using slump cone test.

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Pick up the correct statement from the following: (A) Continuous grading is not necessary for obtaining a minimum of air voids (B) The omission of a certain size of aggregate is shown by a straight horizontal line on the grading curve (C) The omission of a certain size of aggregate in concrete increases the workability but also increases the liability to segregation (D) All the above

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Last Answer : Answer: Option D

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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Last Answer : Answer: Option A

Pick up the incorrect statement from the following: (A) The bottom and top ends of slump mould are parallel to each other (B) The axis of the mould is perpendicular to the end faces (C) The internal surface of the mould is kept clean and free from set cement (D) The mould is in the form of a frustum of hexagonal pyramid

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Last Answer : Answer: Option D

Concrete gains strength due to (A) Chemical reaction of cement with sand and coarse aggregates (B) Evaporation of water from concrete (C) Hydration of cement (D) All the above

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Last Answer : Answer: Option C

Concrete gains strength due to [ A ] Chemical reaction of cement with sand and coarse aggregates [ B ] Evaporation of water from concrete [ C ] Hydration of cement [ D ] All the above

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Last Answer : [ C ] Hydration of cement

Pick up the correct statement from the following: (A) The theory of formation of concrete is based on the phenomena of formation of voids (B) The bulking of sand is taken into account while volumetric proportioning of the aggregates (C) The dry sand and the sand completely flooded with water, have practically the same volume (D) All the above

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Last Answer : Answer: Option D

Pick up the incorrect statement from the following: (A) With passage of time, the strength of cement increases (B) With passage of time, the strength of cement decreases (C) After a period of 24 months, the strength of cement reduces to 50% (D) The concrete made with storage deteriorated cement, gains strength with time

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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 aggregat

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C.R.R.I. charts are used to obtain a relationship between strength of concrete and (A) Water cement ratio (B) Workability (C) Grading of aggregate (D) Fineness modulus

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Last Answer : Answer: Option A

The separation of water or water cement mixture from the freshly laid concrete is known as [ A ] Workability [ B ] Segregation [ C ] Bleeding [ D ] Creep

Description : The separation of water or water cement mixture from the freshly laid concrete is known as [ A ] Workability [ B ] Segregation [ C ] Bleeding [ D ] Creep

Last Answer : [ C ] Bleeding

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

Description : 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

Last Answer : (D) All the above

For preparing a test-specimen, it is necessary (A) To mix cement and fine aggregate by dry hand (B) To mix coarse aggregates (C) To mix water to the cement, fine aggregates and coarse aggregates (D) All the above

Description : For preparing a test-specimen, it is necessary (A) To mix cement and fine aggregate by dry hand (B) To mix coarse aggregates (C) To mix water to the cement, fine aggregates and coarse aggregates (D) All the above

Last Answer : Answer: Option D

For high degree of workability, the slump value should vary between (a) 0 to 25mm (b) 25 to 50mm (c) 50 to 80mm (d) 80 to 100mm

Description : For high degree of workability, the slump value should vary between (a) 0 to 25mm (b) 25 to 50mm (c) 50 to 80mm (d) 80 to 100mm

Last Answer : (d) 80 to 100mm