Concrete Technology Mock Test 4

10%

Question 1 of 10

1. Bulk density of the silica fume varies from ____________

650 kg/mm³

75-150 kg/mm³

750 kg/mm³

130-600 kg/m³

Question 1 of 10

Question 2 of 10

2. The water–cement ratio is the ratio of _______________

Density of water to the Density of cement

Volume of water to the volume of cement

Weight of water to the weight of cement

Weight of water to the weight of aggregates

Question 2 of 10

Question 3 of 10

3. Workability of concrete is directly proportional to __________

Time of transit

Grading of the aggregates

Water cement ratio

Aggregates cement ratio

Question 3 of 10

Question 4 of 10

4. For complete hydration of cement the w/c ratio needed is ________

More than 0.25 but less than 0.35

More than 0.35 but less than 0.60

More than 0.60

More than 0.25

Question 4 of 10

Question 5 of 10

5. What is the compaction factor for medium degree of workability?

.85

.92

.95

.78

Question 5 of 10

Question 6 of 10

6. Air entrainment in concrete increases ____________

Workability

Strength

The effect of temp variations

The unit weight

Question 6 of 10

Question 7 of 10

7. Approximate percentage range of A₂O₃ in OPC is _______

17-25

3- 10

3-8

4-15

Question 7 of 10

Question 8 of 10

8. A compaction factor of .85 for a cement concrete sample indicates ___________

Very good workability

Medium workability

Good workability

Low workability

Question 8 of 10

Question 9 of 10

9. How to improve the workability of concrete.

Decrease the size of aggregates

Decrease the w/c ratio

Increase the w/c ratio

Don’t mix it for longer time

Question 9 of 10

Question 10 of 10

10. This image has _________

Low porosity

High Strength

High w/c ratio

Low w/c ratio

Question 10 of 10