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Building Materials

Building Materials
According to IS specifications, the compressive strength of ordinary Portland cement after three days should not be less than

16 MPa
11.5 MPa
7 MPa
21 MPa

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Building Materials
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

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

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Building Materials
In a mortar, the binding material is

Cement
Cinder
Sand
Surkhi (brick-dust)

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Building Materials
The cement becomes unsound by the presence of excess

Sulphur
Magnesia
All of these
Lime

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Building Materials
Three basic raw materials which are needed in large quantities for production of steel are

Iron ore, carbon and sulphur
Iron ore, carbon and lime stone
Iron ore, coal and sulphur
Iron ore, coal and lime stone

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Building Materials
Expansion Joints in masonry walls are provided in wall lengths usater than

30 m
20 m
10 m
40 m

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