Concrete Technology Mock Test 6

10%

Question 1 of 10

1. From the below figure, what is A here?

Sand stone

Quartz

Grave

Granite

Question 1 of 10

Question 2 of 10

2. Approximate ratio of the strength of the cement conc of 7 days to that of 28 days (2/3)?

1.15

.85

.75

Question 2 of 10

Question 3 of 10

3. In order to avoid segregation, the concrete should not be thrown from a height.

True

False

Question 3 of 10

Question 4 of 10

4. How many types of shrinkages, caused due to cooling and carbonation?

Question 4 of 10

Question 5 of 10

5. The continuous strain, which the concrete undergoes due to application of external loads, is called __________

Creep

Segregation

Bleeding

Workability

Question 5 of 10

Question 6 of 10

6. Which aggregates have low shrinkage?

Quartz

Sand stone

Granite

Grave

Question 6 of 10

Question 7 of 10

7. What is autogenous shrinkage?

It is an important phenomenon in young concrete. At low w/c ratios, less than about 0.42, all the water is rapidly drawn into the hydration process and the demand for more water creates very fine capillaries

It is not a result of any change in the concrete production process. Rather, it is a result of certain environmental conditions which frequently occur in the Central Missouri area

It is defined as the contracting of a hardened concrete mixture due to the loss of capillary water. This shrinkage causes an increase in tensile

It occurs when the concrete is exposed to air containing carbon dioxide

Question 7 of 10

Question 8 of 10

8. Concrete exhibits initial elastic strain which depends on __________

Magnitude and rate of applied stress

Elastic modulus

Rate of applied stress

Magnitude of applied stress

Question 8 of 10

Question 9 of 10

9. It is observed that 40-80% of the 20 years shrinkage occurs in _____________

3 months

2 weeks

6 months

1 year

Question 9 of 10

Question 10 of 10

10. If the value of f_ck is 100 then what will be the modulus of elasticity?

500

5000

50000

Question 10 of 10