Concrete Technology MCQs

Question 1

Grading of sand causes great variation in

Accepted Answer

all the above

Answer

workability of concrete

Answer

strength of concrete

Answer

durability of concrete

Question 2

On a grading curve, the gap grading is represented' by

Accepted Answer

a horizontal line

Answer

a vertical line

Answer

NW inclined line

Answer

NE inclined line

Question 3

IS Sieve Nos 10 mm and 475 mm are geneally used for grading of

Accepted Answer

both A and B

Answer

coarse aggregates

Answer

fine aggregates

Answer

neither A nor B

Question 4

If a grading curve is horizontal betwen the portions of 20 mm IS Sieve and 475 mm I S Sieve, the graded aggregates do not contain

Accepted Answer

all the above

Answer

20 mm particles

Answer

10 mm particles

Answer

475 mm particles

Question 5

For the construction of cement concerte dams, the maximum permissible size of the aggregates, is

Accepted Answer

40 mm

Answer

50 mm

Answer

60 mm

Answer

70 mm

Question 6

For the construction of cement concrete floor, the maximum permissible size of aggregate, is

Accepted Answer

10 mm

Answer

4 mm

Answer

6 mm

Answer

8 mm

Question 7

The most useless aggregate is one whose surface texture is

Accepted Answer

glassy

Answer

smooth

Answer

granular

Answer

honey combed & porous

Question 8

Pick up the correct statement from the following :

Accepted Answer

All the above

Answer

According to the petrological characteristics, concrete aggregates are classified as heavy weight, normal weight and light weight

Answer

According to the shape of the particles, concrete aggregates are classified as rounded rregular, angular and flaky

Answer

According to the surface texture of the particles, the concrete aggregates are classified as glassy, smooth, - granular, rough, crystalline, honey combed and porous

Question 9

The light weight aggregates are obtained from

Accepted Answer

volcanic source

Answer

sedimentary rocks

Answer

metamorphic rocks

Answer

igneous rocks