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4

Hardening of cement occurs at

A. Rapid rate during the first few days and afterwards it continues to increase at a decreased rate

B. Slow rate during the first few days and afterwards it continues to increase at a rapid rate

C. Uniform rate throughout its age

D. None of these

Correct Answer :

D. None of these


Related Questions

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4

The strength of concrete after one year as compared to 28 days strength is about

A. 10 to 15% more

B. 15 to 20% more

C. 20 to 25% more

D. 25 to 50% more

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4

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

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4

Vicat's apparatus is used for

A. Fineness test

B. Consistency test

C. Setting time test

D. Soundness test

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4

Permissible compressive strength of M 150 concrete grade is

A. 100 kg/cm2

B. 150 kg/cm2

C. 200 kg/cm2

D. 250 kg/cm2

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4

Pozzolanic properties exist in

A. Shales

B. Fly ash

C. Pumicite

D. All the above

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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

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4

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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4

Di-calcium silicate (C2S)

A. Hydrates rapidly

B. Generates less heat of hydration

C. Hardens rapidly

D. Provides less ultimate strength to cement

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4

If 20 kg of coarse aggregate is sieved through 80 mm, 40 mm, 20 mm, 10 mm, 4.75 mm, 2.36 mm, 1.18 mm, 600 micron, 300 micron and 150 micron standard sieves and the weights retained are 0 kg, 2 kg, 8 kg, 6 kg, 4 kg respectively, the fineness modulus of the aggregate, is

A. 7.30

B. 7.35

C. 7.40

D. 7.45

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4

According to IS: 4561978, minimum slenderness ratio for a short column is

A. Less than 12

B. Less than 18

C. Between 18 and 24

D. More than 24

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4

Permissible compressive strength of M 300 concrete grade is

A. 100 kg/cm2

B. 150 kg/cm2

C. 200 kg/cm2

D. 300 kg/cm2

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4

Workability improved by adding

A. Air-entraining agent

B. Foaming agent

C. Oily-agent

D. All the above

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4

Slump test of concrete is a measure of its

A. Consistency

B. Compressive strength

C. Tensile strength

D. Impact value

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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

In pre-stressed concrete

A. Forces of tension and compression change but lever arm remains unchanged

B. Forces of tension and compressions remain unchanged but lever arm changes with the moment

C. Both forces of tension and compression as well as lever arm change

D. Both forces of tension and compression as well as lever arm remain unchanged

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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

An aggregate which passes through 25 mm I.S. sieve and is retained on 20 mm sieve, is said to be flaky if its least dimension is less than

A. 22.5 mm

B. 18.5 mm

C. 16.5 mm

D. 13.5 mm

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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

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

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

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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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

For construction of structures in sea water, the cement generally preferred to, is

A. Portland-pozzolana cement

B. Quick setting cement

C. Low heat Portland cement

D. Rapid hardening cement

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4

The minimum cover to the ties or spirals should not be less than

A. 15 mm

B. 20 mm

C. 25 mm

D. 50 mm

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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

Select the incorrect statement

A. The loss of pre-stress is more in pre-tensioning system than in posttensioning system.

B. Pre-tensioning system has greater certainty about its durability.

C. For heavy loads and large spans in buildings or bridges, posttensioning system is cheaper than pre-tensioning system

D. None of the above

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4

According to IS: 4561978, the maximum reinforcement in a column is

A. 2 %

B. 4 %

C. 6 %

D. 8 %

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4

To obtain a very high strength concrete, use very fine grained

A. Granite

B. Magnetite

C. Barite

D. Volcanic scoria

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4

Select the correct statement

A. Elastic modulus of high tensile steel is nearly the same as that of mild steel

B. Elastic modulus of high tensile steel is more than that of mild steel

C. Carbon percentage in high carbon steel is less than that in mild steel

D. High tensile steel is cheaper than mild steel

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4

Pick up the incorrect statement applicable to the field test of good cement.

A. When one thrusts one's hand into a bag of cement, one should feel warm

B. The colour of the cement is bluish

C. By rubbing cement in between fingers, one should feed rough

D. All the above