Workability reduces with time.

The influence of shape of aggregate in strength and workability of concrete are given below in statements S1, S2, S3 and S4. Which of the statements are correct? S1: Rounded aggregate produces concrete with high workability and low strength. S2: Angular aggregate produces concrete with high workability and low strength. S3: Rounded aggregate produces concrete with low workability and high strength. S4: Angular aggregate produces concrete with low workability and high strength.

A

S3 and S4

B

S2 and S3

C

S1 and S2

D

S1 and S4

Consider the following statements: 1. If more water is added to concrete for increasing its workability, it results into concrete of low strength. 2. No slump is an indication of a 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?

A

1 and 3 only

B

2 and 3 only

C

1 and 4 only

D

2 and 4 only

Workability of concrete can be measured using slump, compaction factor and Vee-bee time. Consider the following statements for workability of concrete: (i) As the slump increases, the Vee-bee time increases. (ii) As the slump increases, the compaction factor increases. Which of the following is TRUE?

A

Both (i) and (ii) are True

B

Both (i) and (ii) are False

C

(i) is True and (ii) is False

D

(i) is False and (ii) is True

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?

A

1, 2 and 3 only

B

1, 2 and 4 only

C

1, 3 and 4 only

D

2, 3 and 4 only

Which of the following statements are correct with regard to cement mortar? 1. Workability of cement mortar can be improved by addition of lime. 2. Fly-ash cement is economical in plastering jobs. 3. Addition of saw dust improves workability 4. Sand in mortar can be replaced by finely crushed fire bricks

A

1, 2, 3 and 4

B

1, 2 and 3 only

C

3 and 4 only

D

1, 2 and 4 only

Proper amount of entrained air in concrete results in (i) Better workability (ii) Better resistance to freezing and thawing (iii) Lesser workability (iv) Less resistance to freezing and thawing

A

(i) and (ii)

B

(i) and (iv)

C

(ii) and (iii)

D

(iii) and (iv)

Proper amount of entrained air in concrete results in
(i) Better workability
(ii) Better resistance to freezing and thawing
(iii) Lesser workability
(iv) Less resistance to freezing and thawing

A

(i) and (ii)

B

(i) and (iv)

C

(ii) and (iii)

D

(iii) and (iv)

Consider the following statements related to uplift pressure in gravity dams: 1. A drainage gallery reduces the uplift pressure at all levels below the gallery. 2. A drainage gallery below upstream water level reduces the uplift pressure at all levels below the upstream water level. 3. A grout curtain near the heel reduces seepage and uplift pressure everywhere on the gravity dam whatever the upstream water level. Which of the above statements are correct?

A

2 and 3 only

B

1 and 2 only

C

1 and 3 only

D

1, 2 and 3

Consider the following statements for air-entrained concrete: (i) Air-entrainment reduces the water demand for a given level of workability. (ii) Use of air-entrained concrete is required in environments where cyclic freezing and thawing is expectedWhich of the following is TRUE?

A

Both (i) and (ii) are True

B

Both (i) and (ii) are False

C

(i) is True and (ii) is False

D

(i) is False and (ii) is True

Consider two decision problems Q1, Q2 such that Q1 reduces in polynomial time to 3-SAT and 3-SAT reduces in polynomial time to Q2. Then which one of the following is consistent with the above statement?

A

Q₁ is in NP, Q₂ is NP hard

B

Q₂ is in NP, Q₁ is NP hard

C

Both Q₁ and Q₂ are in NP

D

Both Q₁ and Q₂ are NP hard

Workability reduces with time.

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