Workability of Concrete

Q. Consider the following statements :
1. Workability of concrete increases with the increase in the proportion of water content
2. Concrete having small-sized aggregates is more workable than that containing large-sized aggregate
3. For the same quantity of water, rounded aggregates produce a more workable concrete mix as compared to angular and flaky aggregates
4. A concrete mix with no slump shown in the slump cone test indicates its very poor workability
Which of the above statements are correct ?

1. 1, 2 and 3 only
2. 1, 2 and 4 only
3. 1, 3 and 4 only
4. 2, 3 and 4 only

Q. Consider the following statements:
1. If more water is added to concrete for increasing its workability, it results in concrete of low strength.
2. No slump is an indication of good, workable concrete.
3. Higher the slump of concrete, lower will be its workability
4. Workability of concrete is affected by water content as well as water-cement ratio.
Which of the above statements are correct?

1. 1 and 3 only
2. 2 and 3 only
3. 1 and 4 only
4. 2 and 4 only

Q. Workability of concrete is independent of

1. Mix proportion
2. Water content
3. Size, shape and texture of aggregate
4. None of the above

Q. Upon mixing water to the concrete ingredients, hydration takes place. The correct sequence of stages of the hydration process is :

1. hardening, setting, loss of workability
2. loss of workability, setting, hardening.
3. setting, loss of workability, hardening
4. hardening, loss of workability, setting

Q. Which of the following is not a test for measuring the workability of concrete ?

1. Slump Test
2. Flow Test
3. Std. Consistency Test
4. Kelly Ball Test

Q. Harsh mix of concrete ________

1. lack of plasticity
2. is cohesive
3. has high cement content
4. can be easily moulded