Concrete Technology and Design

191. Separation of water or water sand cement from a freshly concrete, is known

1. Bleeding
2. Creeping
3. Segregation
4. Flooding

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192. Setting time of cement increases by adding

1. Gypsum
2. Hydrogen peroxide
3. Calcium chloride
4. Sodium oxide

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193. Shrinkage in concrete can be reduced by using

1. Low water cement ratio
2. Less cement in the concrete
3. Proper concrete mix
4. All the above

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194. Shrinkage of concrete depends upon
(i) Humidity of atmosphere
(ii) Passage of time
(iii) Stress
The correct answer is

1. (i) and (ii)
2. (ii) and (iii)
3. Only (iii)
4. All (i), (ii) and (iii)

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195. Sinking of an intermediate support of a continuous beam
(i) Reduces the negative moment at support
(ii) Increases the negative moment at support
(iii) Reduces the positive moment at center of span
(iv) Increases the positive moment at center of span
The correct answer is

1. (i) and (iii)
2. (i) and (iv)
3. (ii) and (iii)
4. (ii) and (iv)

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196. Slump test is done for

1. Clay
2. Sand
3. Lime
4. Concrete

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197. Slump test of concrete is a measure of its

1. Consistency
2. Compressive strength
3. Tensile strength
4. Impact value

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198. Specified compressive strength of concrete is obtained from cube tests at the end of

1. 3 days
2. 7 days
3. 21 days
4. 28 days

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199. Strength of concrete increases with

1. Increase in water-cement ratio
2. Increase in fineness of cement
3. Decrease in curing time
4. Decrease in size of aggregate

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200. Strength of concrete with passage of time

1. Increases
2. Decreases
3. Fluctuates
4. Remains constant

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