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Building Materials

Building Materials
Which of the following ingredients of the brick earth enables the brick to retain its shape?

Alumina
Silica
Iron
Magnesia

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Building Materials
Good quality sand is never obtained from

Sea
Lake
Gravel powder
River

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Building Materials
The ratio of the thickness of web to that of flange of steel rolled structural beams and channels is

Less than 1 in beams but greater than 1 in channels
Greater than 1
Less than 1
Equal to 1

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Building Materials
The size of mould for bricks, is generally kept

A little large to specified size
Equal to specified size
A little small to specified size
10% larger than specified size

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Building Materials
Gypsum consists of

CaSO4 and H₂O
H₂S and CO₂
Lime and H₂O
CO₂ and calcium

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Building Materials
The percentage of alumina and silica in good fire clay vary respectively is

35, 65
30, 70
25, 75
All of these

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