Floating Concrete II Year
- 1.The aggregate in which particle of all sizes are present in various proportions is called
- A.
Graded aggregate
- B.
All-in-aggregate
- C.
Single size aggregate
- D.
None of these
- 2.The aggregate in which majority of particles are one and same size is called
- A.
Graded aggregate
- B.
All-in-aggregate
- C.
Continuous aggregate
- D.
None of these
- 3.The maximum size of coarse aggregate for the concrete in a column of size 400 x 400 mm should be
- A.
40 mm
- B.
35 mm
- C.
25 mm
- D.
20 mm
- 4.As the size of coarse aggregate decreases, the workability of concrete
- A.
Decreases
- B.
Increases
- C.
First increases then decreases
- D.
First decreases then increases
- 5.Shape of crushed rocks is
- A.
Rounded
- B.
Irregular
- C.
Flaky
- D.
Angular
- 6.The shape of laminated rock is
- A.
Rounded
- B.
Flaky
- C.
Irregular
- D.
Angular
- 7.River gravel is
- A.
Flaky
- B.
Irregular
- C.
Angular
- D.
Rounded
- 8.Following shape of particle is not desirable in aggregate
- A.
Rounded
- B.
Irregular
- C.
Angular
- D.
Flaky
- 9.Flaky shape is not desirable because it has
- A.
Lowest surface area for given volume
- B.
Highest surface area for given volume
- C.
Lowest perimeter for a given volume
- D.
None of these
- 10.Flaky particle in aggregate
- A.
Reduces workability
- B.
Reduces durability
- C.
Hardened concrete looks like a stratified rock
- D.
All of these
- 11.The percentage of tricalcium aluminates in sulphate resisting cement is
- A.
More than 6%
- B.
Less than 6%
- C.
More than 16%
- D.
Less than 16%
- 12.Sulphate resisting cement is useful in structures
- A.
In river waters
- B.
Sea waters
- C.
In cold environment
- D.
In hot environment
- 13.Portland blast furnace slag cement can be used
- A.
In under water structures
- B.
In structures in alkaline soils
- C.
In all places where ordinary Portland cement is used
- D.
All of these
- 14.Slag from blast furnace contains
- A.
Alumina
- B.
Lime
- C.
Silica
- D.
All of these
- 15.Blast furnace slag has approximately
- A.
45% calcium oxide and about 35% silica
- B.
50% alumina and 20% calcium oxide
- C.
25% magnesia and 15% silica
- D.
25% calcium sulphate and 15% alumina
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