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Concrete mainly consists of

A. Cement

B. Aggregates

C. Water

D. All the above

Correct Answer :

D. All the above


Related Questions

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Internal friction between the ingredients of concrete, is decreased by using

A. Less water

B. Fine aggregates

C. Rich mix

D. More water and coarse aggregates

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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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When shear stress exceeds the permissible limit in a slab, then it is reduced by

A. Increasing the depth

B. Providing shear reinforcement

C. Using high strength steel

D. Using thinner bars but more in number

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Ordinary concrete is not used for concrete grade

A. M 100

B. M 150

C. M 250

D. M 400

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Sinking of an intermediate support of a continuous beam (i) Reduces the negative moment at support (ii) Increases the negative moment at support (iii) Reduces the positive moment at center of span (iv) Increases the positive moment at center of span The correct answer is

A. (i) and (iii)

B. (i) and (iv)

C. (ii) and (iii)

D. (ii) and (iv)

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The load carrying capacity of a helically reinforced column as compared to that of a tied column is about

A. 5 % less

B. 10 % less

C. 5 % more

D. 10 % more

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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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According to I.S. : 456, the number of grades of concrete mixes, is

A. 3

B. 4

C. 5

D. 7

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Tricalcium aluminate (C3A)

A. Reacts fast with water

B. Generates less heat of hydration

C. Causes initial setting and early strength of cement

D. Does not contribute to develop ultimate strength

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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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An ideal ware house, is provided

A. Water proof masonry walls

B. Water proof roof

C. Few windows which remain generally closed

D. All the above

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Allowable shear strength of concrete, depends upon

A. Shear strength

B. Tensile strength

C. Compressive strength

D. None of these

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For preparing ordinary concrete, the quantity of water used, is

A. 5% by weight of aggregates plus 20% of weight of cement

B. 10% by weight of aggregates plus 10% of weight of cement

C. 5% by weight of aggregates plus 30% of weight of cement

D. 30% by weight of aggregates plus 10% of weight of cement

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For the design of retaining walls, the minimum factor of safety against overturning is taken as

A. 1.5

B. 2.0

C. 2.5

D. 3.0

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The factor of safety for

A. Steel and concrete are same

B. Steel is lower than that for concrete

C. Steel is higher than that for concrete

D. None of the above

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While designing an air entrained concrete

A. Water cement ratio is reduced

B. Proportion of aggregates is reduced

C. An allowance for the entrained air is made

D. All the above

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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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A flaky aggregate is said to be elongated if its length is

A. Equal to the mean size

B. Twice the mean size

C. Thrice the mean size

D. Four times the mean size

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Pre-stress loss due to friction occurs

A. Only in post-tensioned beams

B. Only in pre-tensioned beams

C. In both post-tensioned and pre-tensioned beams

D. None of the above

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The bulk density of aggregates, depends upon

A. Shape

B. Grading

C. Compaction

D. All the above

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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

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The concrete mix which causes difficulty in obtaining a smooth finish, possess

A. Segregation

B. Internal friction

C. Hardness

D. Bleeding

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Pick up the correct statement from the following:

A. The concrete gains strength due to hydration of cement

B. The concrete does not set at freezing point

C. The strength of concrete increases with its age

D. All the above

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The produce impermeable concrete

A. Thorough mixing of concrete is required

B. Proper compaction of concrete is required

C. Proper curing of concrete is required

D. All the above

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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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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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The compressive strength of 100 mm cube as compared to 150 mm cube is always

A. Less

B. More

C. Equal

D. None of the above

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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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If aggregates completely pass through a sieve of size 75 mm and are retained on a sieve of size 60 mm, the particular aggregate will be flaky if its minimum dimension is less than

A. 20.5 mm

B. 30.5 mm

C. 40.5 mm

D. 50.5 mm

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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