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Building Materials

Building Materials
The age of a tree can be known by examining

Cambium layer
Annular rings
Medullary rays
Heart wood

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Building Materials
The softest rock is

Diamond
Marble
Quartz
Talc

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Building Materials
The slag which floats on the surface of the molten iron generally contains

Lime (CaO) 45%
Silica (SiO2) 35%
All listed here
Alumina (Al2O3) 12% and MgO, CaSO4, KMnO2 and FeO 8%

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Building Materials
The foliated structure is very common in

Sedimentary rocks
None of these
Metamorphic rocks
Igneous rocks

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Building Materials
Whitworth compressed steel is obtained when molten steel is subjected to a pressure of

9 kg/mm²
5 kg/mm²
13 kg/mm²
15 kg/mm²

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Building Materials
Soundness of cement is tested by

Compressive strength testing apparatus
None of these
Vicat's apparatus
Le-chatelier apparatus

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