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Building Materials

Building Materials
Formula for quick lime, is

CaCO₃
None to these
CO₃CO₂
Ca(OH)₂

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Building Materials
For melting one tonne of cast iron

700 m3 air is required
All listed here
20 kg limestone is required
One quintal coke is required

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Building Materials
Invar contains

24% of nickel
30% of nickel
12% of nickel
36% of nickel

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

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

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Building Materials
Pick up the volcanic rock from the following:

Basalt
Dolerite
All listed here
Granite

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Building Materials
The cracks caused by shrinkage of the exterior surface of the wood exposed to atmosphere, are called:

Heart shakes
Twisted fibres
Wind cracks
Radial shakes

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