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4

The condition not applicable to water cement ratio law, is

A. Internal moisture conditions on hydration continue till complete strength is gained

B. Concrete specimens may be tested at any temperature

C. Concrete specimens need be of same age

D. Concrete specimens need be of same size

Correct Answer :

B. Concrete specimens may be tested at any temperature


Related Questions

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4

Pick up the correct statement from the following:

A. According to the petrological characteristics, concrete aggregates are classified as heavy weight, normal weight and light weight

B. According to the shape of the particles, concrete aggregates are classified as rounded irregular, angular and flaky

C. According to the surface texture of the particles, the concrete aggregates are classified as glassy, smooth, granular, rough, crystalline, honey combed and porous

D. All the above

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4

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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4

The ratio of the diameter of reinforcing bars and the slab thickness is

A. 1/4

B. 1/5

C. 1/6

D. 1/8

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4

The recommended value of modular ratio for reinforced brick work is

A. 18

B. 30

C. 40

D. 58

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4

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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4

Modulus of elasticity of steel as per IS: 4561978 shall be taken as

A. 20 kN/cm²

B. 200 kN/cm²

C. 200 kN/mm²

D. 2 × 106 N/cm²

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4

The load factors for live load and dead load are taken respectively as

A. 1.5 and 2.2

B. 2.2 and 1.5

C. 1.5 and 1.5

D. 2.2 and 2.2

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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

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 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

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

A T-shaped retaining wall mainly consists of

A. One cantilever

B. Two cantilevers

C. Three cantilevers

D. Four cantilevers

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4

The effect of creep on modular ratio is

A. To decrease it

B. To increase it

C. Either to decrease or to increase it

D. To keep it unchanged

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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

Batching error means inaccuracy in the quantity of

A. Aggregates

B. Cement

C. Water

D. All the above

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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

The effect of adding calcium chloride in concrete is (i) To increase shrinkage (ii) To decrease shrinkage (iii) To increase setting time (iv) To decrease setting time The correct answer is

A. (i) and (iii)

B. (i) and (iv)

C. (ii) and (iii)

D. (ii) and (iv)

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4

Le-Chatelier's apparatus is used for testing

A. Soundness of cement

B. Hardness of cement

C. Strength of cement

D. Durability of cement

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4

The impurity of mixing water which affects the setting time and strength of concrete, is

A. Sodium sulphates

B. Sodium chlorides

C. Sodium carbonates and bicarbonates

D. Calcium bicarbonates

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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

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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4

The bulk density of aggregates, depends upon

A. Shape

B. Grading

C. Compaction

D. All the above

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4

The percentage of reinforcement in case of slabs, when high strength deformed bars are used is not less than

A. 0.15

B. 0.12

C. 0.30

D. 1.00

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4

Pozzolana cement is used with confidence for construction of

A. Dams

B. Massive foundations

C. R.C.C. structures

D. All the above

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4

Allowable shear strength of concrete, depends upon

A. Shear strength

B. Tensile strength

C. Compressive strength

D. None of these

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4

If the storey height is equal to length of RCC wall, the percentage increase in strength is

A. 0

B. 10

C. 20

D. 30

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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 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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4

The minimum cover in a slab should neither be less than the diameter of bar nor less than

A. 10 mm

B. 15 mm

C. 25 mm

D. 13 mm

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4

A concrete having a slump of 6.5 cm, is said to be

A. Dry

B. Earth moist

C. Semi-plastic

D. Plastic