Concrete Technology MCQs

Question 1

Pick up the correct statement from the following :

Accepted Answer

None of these

Answer

Segregation is necessary for a workable concrete

Answer

Consistency does not affect the workability of concrete

Answer

If the slump increases, workability decreases

Question 2

Wp and Wf are the weights of a cylinder containing partially compacted and fully compacted concrete lithe corn, wp N paction factor is 095, the workability of concrete is wf

Accepted Answer

high

Answer

extrernety low

Answer

very low

Answer

low

Question 3

Proper proportioning of concrete, ensures

Accepted Answer

all the above

Answer

desired strength and workability

Answer

desired durability

Answer

water tightness of the structure

Question 4

The grade of concrete not recommended by 1S : 456, is

Accepted Answer

M 500

Answer

M 100

Answer

M 200

Answer

M 300

Question 5

The grade of concrete M 150 means that compressive strength of a 15 cm cube after 28 days, is

Accepted Answer

150 kg/cm2

Answer

100 kg/cm2

Answer

200 kg/cm2

Answer

250 kg/cm2

Question 6

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

Accepted Answer

7

Answer

3

Answer

4

Answer

5

Question 7

If the engineer-in-charge approves, the 10 cm cubes may be used for the work test of concrete provided maximum nominal size of aggregate, does not exceed

Accepted Answer

20 cm

Answer

10 cm

Answer

15 cm

Answer

25 cm

Question 8

Pick up the incorrect statement from the following While performing preliminary test on concrete

Accepted Answer

concrete ingredients should be kept at a temperature of 37??2?C

Answer

proportions of the material and water should be the same as to be used at the work site

Answer

cement should be mixed by hand in order to maintain uniformity

Answer

concrete mix should be stored in air-tight containers

Question 9

For preparing a test-speciMen, it is necessary

Accepted Answer

all the above

Answer

to mix cement and fine aggregate by dry hand

Answer

to mix coarse aggregates

Answer

to mix water to the cement, fine aggregates and coarse aggregates