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Building Materials

Building Materials
Plastics are compounds of carbon with element

Hydrogen
Nitrogen
Oxygen
All of these

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Building Materials
Excess of silica in brick earth results in

cracking and warping of bricks
loss of cohesion
None of these
enhancing the impermeability of bricks

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Building Materials
To retard the initial setting time of cement, the compound responsible, is

Tri-calcium aluminate
Di-calcium silicate
Gypsum
Tri-calcium silicate

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Building Materials
According to ISI, bitumen is classified into

2 grades
4 grades
10 grades
8 grades

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Building Materials
Age of a tree may be ascertained by

Number of annual rings
Circumference of its stem
Number of branches
Radius of its stem

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Building Materials
For preparing porcelains, the clay should be

Sufficiently pure
Of high degree of tenacity
Of good plasticity
All listed here

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