Home
Current Affairs January 2024

What is the correct answer?

4

Setting time of cement increases by adding

A. Gypsum

B. Hydrogen peroxide

C. Calcium chloride

D. Sodium oxide

Correct Answer :

A. Gypsum


Related Questions

What is the correct answer?

4

The ratio of the length to breadth of a wooden float, is

A. 4.5

B. 5.5

C. 6.5

D. 7.5

What is the correct answer?

4

In a spherical dome the hoop stress due to a concentrated load at crown is

A. Compressive everywhere

B. Tensile everywhere

C. Partly compressive and partly tensile

D. Zero

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

C.R.R.I. charts are used to obtain a relationship between strength of concrete and

A. Water cement ratio

B. Workability

C. Grading of aggregate

D. Fineness modulus

What is the correct answer?

4

Pick up the correct statement from the following:

A. Segregation is necessary for a workable concrete

B. Consistency does not affect the workability of concrete

C. If the concrete mix is dry, the slump is maximum

D. None of these

What is the correct answer?

4

The type of aggregates not suitable for high strength concrete and for pavements subjected to tension, is

A. Rounded aggregate

B. Irregular aggregate

C. Angular aggregate

D. Flaky aggregate

What is the correct answer?

4

The percentage of the aggregate of F.M. 2.6 to be combined with coarse aggregate of F.M. 6.8 for obtaining the aggregates of F.M. 5.4, is

A. 30 %

B. 40 %

C. 50 %

D. 60 %

What is the correct answer?

4

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

A. M 100

B. M 200

C. M 300

D. M 500

What is the correct answer?

4

The surface where two successive placements of concrete meet, is known as

A. Contraction joint

B. Expansion joint

C. Construction joint

D. Both (a) and (b)

What is the correct answer?

4

The relation between modulus of rupture fcr, splitting strength fcs and direct tensile strength fcl is given by

A. fcr - fcs = fcl

B. fcr > fcs > fcl

C. fcr < fcs < fcl

D. fcs > fcr > fcl

What is the correct answer?

4

The minimum percentage of chemical ingredient of cement is that of

A. Magnesium oxide

B. Iron oxide

C. Alumina

D. Lime

What is the correct answer?

4

For preparing a test-specimen, it is necessary

A. To mix cement and fine aggregate by dry hand

B. To mix coarse aggregates

C. To mix water to the cement, fine aggregates and coarse aggregates

D. All the above

What is the correct answer?

4

Bulking of sand is maximum if moisture content is about

A. 2 %

B. 4 %

C. 6 %

D. 10 %

What is the correct answer?

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

What is the correct answer?

4

Sand generally contains salt if it is obtained from:

A. Nala beds

B. River beds

C. Sea beds

D. None of these

What is the correct answer?

4

The 28 days cube strength of mass concrete using aggregates of maximum size 5 cm for gravity dams should be

A. Between 150 to 300 kg/cm2

B. Between 350 to 600 kg/cm2

C. Between 150 to 500 kg/cm2

D. Below 200 kg/cm2

What is the correct answer?

4

Maximum percentage reinforcement in case of slabs is limited to

A. 2

B. 4

C. 6

D. 8

What is the correct answer?

4

If P, Y and Z are the weights of cement, fine aggregates and coarse aggregates respectively and W/C is the water cement ratio, the minimum quantity of water to be added to first batch, is obtained by the equation

A. 0.1P + 0.3Y + 0.1Z = W/C × P

B. 0.3P + 0.1Y + 0.01Z = W/C × P

C. 0.4P + 0.2Y + 0.01Z = W/C × P

D. 0.5P + 0.3Y + 0.01Z = W/C × P

What is the correct answer?

4

Hydration of cement is due to chemical action of water with

A. Tricalcium silicate and dicalcium silicate

B. Dicalcium silicate and tricalcium aluminate

C. Tricalcium aluminate and tricalcium alumino ferrite

D. All the above

What is the correct answer?

4

Pick up the correct statement from the following:

A. Water cement paste hardens due to hydration

B. During hardening cement binds the aggregates together

C. Cement provides strength, durability and water tightness to the concrete

D. All the above

What is the correct answer?

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

What is the correct answer?

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

What is the correct answer?

4

In a spherical dome subjected to concentrated load at crown or uniformly distributed load, the meridional force is always

A. Zero

B. Tensile

C. Compressive

D. Tensile or compressive

What is the correct answer?

4

Construction joints are provided

A. Where B.M. and S.F. are small

B. Where the member is supported by other member

C. At 18 m apart in huge structures

D. All the above

What is the correct answer?

4

For a cantilever of effective depth of 0.5 m, the maximum span to satisfy vertical deflection limit is

A. 3.5 m

B. 4 m

C. 4.5 m

D. 5 m

What is the correct answer?

4

If the foundations of all the columns of a structure are designed on the total live and dead load basis, then

A. There will be no settlement of columns

B. There will be no differential settlement

C. The settlement of exterior columns will be more than interior columns

D. The settlement of interior columns will be more than exterior columns

What is the correct answer?

4

Sinking of an intermediate support of a continuous beam (i) Reduces the negative moment at support (ii) Increases the negative moment at support (iii) Reduces the positive moment at center of span (iv) Increases the positive moment at center of span The correct answer is

A. (i) and (iii)

B. (i) and (iv)

C. (ii) and (iii)

D. (ii) and (iv)

What is the correct answer?

4

The void ratio of

A. Single size coarse aggregate is roughly 0.45

B. Graded coarse aggregate is roughly 0.040

C. Fine aggregate is roughly 0.45

D. All the above

What is the correct answer?

4

Pick up the correct statement from the following:

A. Insufficient quantity of water makes the concrete mix harsh

B. Insufficient quantity of water makes the concrete unworkable

C. Excess quantity of water makes the concrete segregated

D. All the above

What is the correct answer?

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