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Building Materials

Building Materials
Pig iron is manufactured from the ores by

Smelting
All of these
Dressing
Calcination and roasting

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Building Materials
Bessemer process is used for the manufacture of

Wrought iron
Pig iron
Steel
Cast iron

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

30 m
40 m
10 m
20 m

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Building Materials
First class timber has an average life of

Less than one year
1 to 5 years
5 to 10 years
More than 10 years

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Building Materials
Inner part of a timber log surrounding the pitch, is called

None to these
Heart wood
Cambium layer
Sapwood

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Building Materials
The fire clay contains pure

Lime
Hydrated aluminium silicate
Oxide of iron
Magnesium

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