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4

Joints in concrete structures, are provided

A. To reduce the tensile stresses likely to be developed due to evaporation of water

B. To minimise the change in the dimensions of the slab

C. To minimise the necessary cracking

D. All the above

Correct Answer :

D. All the above


Related Questions

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4

In a pile of length l, the points of suspension from ends for lifting it are located at

A. 0.207 l

B. 0.25 l

C. 0.293 l

D. 0.333 l

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4

If X, Y and Z are the fineness modulli of coarse, fine and combined aggregates, the percentage (P) of fine aggregates to combined aggregates, is

A. P = [(Z - X)/(Z - Y)] × 100

B. P = [(X - Z)/(Z - Y)] × 100

C. P = [(X - Z)/(Z + Y)] × 100

D. P = [(Z + X)/(Z - Y)] × 100

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4

Pick up the correct statement from the following:

A. Sand obtained from pits, is washed to remove clay and silt

B. Sand obtained from flooded pits, need not be washed before use

C. The chloride in sea shore sand and shingle may cause corrosion of reinforcement if the concrete is porous

D. All the above

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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

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4

Workability of concrete for a given water content is good if the aggregates, are

A. Rounded aggregate

B. Irregular aggregate

C. Angular aggregate

D. Flaky aggregates

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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

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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4

To hydrate 500kg of cement full water needed, is

A. 100 kg

B. 110 kg

C. 120 kg

D. 130 kg

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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

In the method of voids for determination of the quantity of cement paste, it is assumed that

A. Voids in coarse aggregates are filled by fine aggregates

B. Voids in fine aggregates are filled by the cement paste

C. Volume of fine aggregates is equal to total voids in coarse aggregates plus 10% extra

D. All the above

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4

Saw dust can be rendered chemically inert by boiling it in water containing

A. Ferrous sulphate

B. Potassium chloride

C. Ammonia

D. Nitric acid

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4

The risk of segregation is more for

A. Wetter mix

B. Larger proportion of maximum size aggregate

C. Coarser grading

D. All the above

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4

Joints in concrete structures, are provided

A. To reduce the tensile stresses likely to be developed due to evaporation of water

B. To minimise the change in the dimensions of the slab

C. To minimise the necessary cracking

D. All the above

What is the correct answer?

4

In counterfort type retaining walls (i) The vertical slab is designed as a continuous slab (ii) The heel slab is designed as a continuous slab (iii) The vertical slab is designed as a cantilever (iv) The heel slab is designed as a cantilever The correct answer is

A. (i) and (ii)

B. (i)and(iv)

C. (ii) and (iii)

D. (iii) and (iv)

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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

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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

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4

Workability of concrete is directly proportional to

A. Aggregate cement ratio

B. Time of transit

C. Grading of the aggregate

D. All of above

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4

Permissible compressive strength of M 200 concrete grade is

A. 100 kg/cm2

B. 150 kg/cm2

C. 200 kg/cm2

D. 250 kg/cm2

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4

Bulking of sand is

A. Mixing of different sizes of sand particles

B. Mixing of lime with sand

C. Maximum water with sand

D. Swelling of sand when wetted

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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

Sands of zone I are:

A. Course

B. Medium

C. Medium to fine

D. Fine

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4

For a continuous slab of 3 m × 3.5 m size, the minimum overall depth of slab to satisfy vertical deflection limits is

A. 50 mm

B. 75 mm

C. 100 mm

D. 120 mm

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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

Grading of sand causes great variation in

A. Workability of concrete

B. Strength of concrete

C. Durability of concrete

D. All the above

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4

The bulk density of aggregates, is generally expressed as

A. Tonnes/cubic metre

B. kg/cubic metre

C. kg/litre

D. g/cm3

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4

The design yield stress of steel according to IS: 4561978 is: (Where fy is the characteristic yield strength of steel)

A. 0.37 fy

B. 0.57 fy

C. 0.67 fy

D. 0.87 fy

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4

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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4

Pick up the incorrect statement from the following:

A. Tricalcium silicate (C3S) hydrates rapidly

B. Tricalcium silicate (C3S) generates more heat of hydration

C. Tricalcium silicate (C3S) develops early strength

D. Tricalcium silicate (C3S) has more resistance to sulphate attack

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4

Higher workability of concrete is required if the structure is

A. Made with cement concrete

B. Thick and reinforced

C. Thin and heavily reinforced

D. Thick and heavily reinforced

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4

The grade of concrete not recommended by I.S. : 456, is

A. M 100

B. M 200

C. M 300

D. M 500