Home
Current Affairs January 2024

What is the correct answer?

4

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

A. 3

B. 4

C. 5

D. 7

Correct Answer :

D. 7


Related Questions

What is the correct answer?

4

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

What is the correct answer?

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)

What is the correct answer?

4

The most useless aggregate is one whose surface texture is

A. Smooth

B. Granular

C. Glassy

D. Honey combed and porous

What is the correct answer?

4

Critical section for shear in case of flat slabs is at a distance of

A. Effective depth of slab from periphery of column/drop panel

B. d/2 from periphery of column/capital/ drop panel

C. At the drop panel of slab

D. At the periphery of column

What is the correct answer?

4

Di-calcium silicate (C2S)

A. Hydrates rapidly

B. Generates less heat of hydration

C. Hardens rapidly

D. Provides less ultimate strength to cement

What is the correct answer?

4

The minimum diameter of longitudinal bars in a column is

A. 6 mm

B. 8 mm

C. 12 mm

D. 16 mm

What is the correct answer?

4

The increased cohesiveness of concrete, makes it

A. Less liable to segregation

B. More liable to segregation

C. More liable to bleeding

D. More liable for surface scaling in frosty weather

What is the correct answer?

4

For the construction of R.C.C. slabs, columns, beams, walls, etc. the grade of concrete mix used, is

A. 1 : 3 : 6

B. 1 : 1 ½ : 3

C. 1 : 2 : 4

D. 1 : 1 : 2

What is the correct answer?

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

What is the correct answer?

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

What is the correct answer?

4

Pick up the incorrect statement from the following:

A. A rich mix of concrete possesses higher strength than that a lean mix of desired workability with excessive quantity of water

B. The strength of concrete decreases as the water cement ratio increases

C. Good compaction by mechanical vibrations, increases the strength of concrete

D. None of these

What is the correct answer?

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

What is the correct answer?

4

For the construction of thin R.C.C. structures, the type of cement to be avoided, is

A. Ordinary Portland cement

B. Rapid hardening cement

C. Low heat cement

D. Blast furnace slag cement

What is the correct answer?

4

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

What is the correct answer?

4

Particles of 0.002 mm size are that of

A. Clay

B. Sand

C. Gravel

D. None of these

What is the correct answer?

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

What is the correct answer?

4

Normally pre-stressing wires are arranged in the

A. Upper part of the beam

B. Lower part of the beam

C. Center

D. Anywhere

What is the correct answer?

4

Pick up the correct statement from the following:

A. Water enables chemical reaction to take place with cement

B. Water lubricates the mixture of gravel, sand and cement

C. Strength of concrete structure largely depends upon its workability

D. All the above

What is the correct answer?

4

In symmetrically reinforced sections, shrinkage stresses in concrete and steel are respectively

A. Compressive and tensile

B. Tensile and compressive

C. Both compressive

D. Both tensile

What is the correct answer?

4

Cement used for normal concrete construction, is obtained by burning a mixture of

A. Siliceous and argillaceous materials

B. Argillaceous and calcareous materials

C. Siliceous and calcareous materials

D. Siliceous, argillaceous and calcareous materials

What is the correct answer?

4

For a longitudinal reinforcing bar in a column, the minimum cover shall neither be less than the diameter of bar nor less than

A. 15 mm

B. 25 mm

C. 30 mm

D. 40 mm

What is the correct answer?

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

What is the correct answer?

4

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

A. Granite

B. Magnetite

C. Barite

D. Volcanic scoria

What is the correct answer?

4

Setting time of cement increases by adding

A. Gypsum

B. Hydrogen peroxide

C. Calcium chloride

D. Sodium oxide

What is the correct answer?

4

Strength of concrete increases with

A. Increase in water-cement ratio

B. Increase in fineness of cement

C. Decrease in curing time

D. Decrease in size of aggregate

What is the correct answer?

4

Which of the following statements is incorrect?

A. Higher Vee-Bee time shows lower workability

B. Higher slump shows higher workability

C. Higher compacting factor shows higher workability

D. None of the above

What is the correct answer?

4

Most common method of pre-stressing used for factory production is

A. Long line method

B. Freyssinet system

C. Magnel-Blaton system

D. Lee-Macall system

What is the correct answer?

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

What is the correct answer?

4

Which of the following R.C. retaining walls is suitable for heights beyond 6 m?

A. L-shaped wall

B. T-shaped wall

C. Counterfort type

D. All of the above

What is the correct answer?

4

For a slab supported on its four edges with corners held down and loaded uniformly, the Marcus correction factor to the moments obtained by Grashoff Rankine's theory

A. Is always less than 1

B. Is always greater than 1

C. Can be more than 1

D. Can be less than 1