BUILDING MATERIALS QUIZ

100 kg/cm²

90 kg/cm²

75 kg/cm²

120 kg/cm²

Soft

Light

Hard

Heavy

All of these

tricalcium silicate

tricalcium aluminate

dicalcium silicate

Has good strength along the panel only

Cannot be bent more easily than ordinary wood of same thickness

Can be spilt in the plane of the panel

Has greater impact resistance to blows than ordinary wood

None to these

Sapwood

Heart wood

Cambium layer

Lime

Oxide of iron

Hydrated aluminium silicate

Magnesium

None of these

Metamorphic rocks

Sedimentary rocks

Igneous rocks

Thin layers below the bark

Innermost annular rings around the pith

Portion of timber between heartwood and cambium layer

Thin fibre which extends from the pith outwards and holds the annular rings together

Less than 1

Equal to 1

Less than 1 in beams but greater than 1 in channels

Greater than 1

25 mm to 50 mm

125 mm to 150 mm

100 mm to 125 mm

50 mm to 100 mm