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4

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

Correct Answer :

C. 40.5 mm


Related Questions

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4

If fineness modulus of sand is 2.5, it is graded as

A. Very fine sand

B. Fine sand

C. Medium sand

D. Coarse sand

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4

The property of fresh concrete, in which the water in the mix tends to rise to the surface while placing and compacting, is called

A. Segregation

B. Bleeding

C. Bulking

D. Creep

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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

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

Ratio of permissible stress in direct compression and bending compression is

A. Less than 1

B. Between 1 and 1.5

C. Between 1.5 and 2.0

D. Greater than 2

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4

In working stress design, permissible bond stress in the case of deformed bars is more than that in plain bars by

A. 10 %

B. 20 %

C. 30 %

D. 40 %

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4

In a counterfort retaining wall, the main reinforcement in the stem at mid span is provided on

A. Front face only

B. Inner face only

C. Both front face and inner face

D. None of the above

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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

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

Addition of pozzolana to cement causes

A. Reduction in permeability

B. Loss of heat of hydration

C. Reduction in bleeding

D. All the above

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4

Due to shrinkage stresses, a simply supported beam having reinforcement only at bottom tends to

A. Deflect downward

B. Deflect upward

C. Deflect downward or upward

D. None of 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

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

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Separation of coarse aggregates from mortar during transportation, is known

A. Bleeding

B. Creeping

C. Segregation

D. Shrinkage

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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

High carbon content in the steel causes

A. Decrease in tensile strength but increase in ductility

B. Increase in tensile strength but decrease in ductility

C. Decrease in both tensile strength and ductility

D. Increase in both tensile strength and ductility

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4

The size of fine aggregates does not exceed

A. 2.75 mm

B. 3.00 mm

C. 3.75 mm

D. 4.75 mm

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Workability improved by adding

A. Air-entraining agent

B. Foaming agent

C. Oily-agent

D. All the above

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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

Ordinary Portland cement is manufactured from

A. Lime stone and clay

B. Gypsum and lime

C. Pozzolana

D. Lime, pozzolana and clay

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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

Pick up the correct statement from the following:

A. Calcium chloride acts as a retarder

B. Calcium chloride acts as an accelerator

C. Gypsum (calcium sulphate) acts as a retarder

D. Both (b) and (c)

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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 lower water cement ratio in concrete, introduces

A. Smaller creep and shrinkage

B. Greater density and smaller permeability

C. Improved frost resistance

D. All the above

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4

Maximum distance between expansion joints in structures as per IS: 456 1978 is

A. 20 m

B. 30 m

C. 45 m

D. 60 m

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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 centroid of compressive force, from the extreme compression fiber, in limit state design lies at a distance of (Where xu is the depth of neutral axis at the limit state of collapse)

A. 0.367 xu

B. 0.416 xu

C. 0.446 xu

D. 0.573 xu

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Concrete is unsuitable for compaction by a vibrator if it is

A. Dry

B. Earth moist

C. Semi-plastic

D. Plastic

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4

For quality control of Portland cement, the test essentially done is

A. Setting time

B. Tensile strength

C. Consistency

D. All the above

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Water cement ratio is generally expressed in volume of water required per

A. 10 kg

B. 20 kg

C. 30 kg

D. 50 kg