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Building Materials

Building Materials
The stones obtained by blasting are used as

Aggregates for concrete
Ballast in railways
Road metal
All listed here

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Building Materials
Study the following statements.
(i) Hydraulic lime is suitable for white washing,
(ii) Fat lime is suitable for whitewashing,
(iii) Hydraulic lime is suitable for making mortar,
(iv) Fat lime is suitable for making mortar.

(iii) and (iv)
(i) and (ii)
(ii) and (iii)
(i) and (iv)

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Building Materials
Which of the following stresses is used for identifying the quality of structural steel?

Yield stress
None of these
Proof stress
Ultimate stress

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Building Materials
For the manufacture of Portland cement, the proportions of raw materials used, are

Silica 40% ; lime 40% ; other ingredients 20%
Lime 63% ; silica 22% ; other ingredients 15%
Silica 70% ; lime 20% ; other ingredients 10%
Lime 22% ; silica 63% ; other ingredients 15%

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Building Materials
The most commonly used retarder in cement is

Gypsum
Calcium chloride
Calcium carbonate
None of these

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Building Materials
The most common admixture which is used to accelerate the initial set of concrete is

Calcium carbonate
Calcium chloride
None of these
Gypsum

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