Stone, Copper, and Iron

What is the preferred type of stone for foundation works?

• Unstructured stones that are hard and difficult to dress

• Lightweight stones

• Stones with specific gravity less than 2.4

• Stones that are not easily dressed and suitable for superstructure

Why are stones with specific gravity less than 2.4 considered unsuitable for buildings?

• They are too heavy

• They are not durable

• They are too dense

• They are weak

Which stones are known for having a good appearance when polished and are often used for face works in buildings?

• Granite and marble

• Limestone and sandstone

• Slate and quartzite

• Basalt and pumice

Which of the following properties is NOT associated with copper?

• Transparent

• Malleable

• Ductile

• Good conductor of electricity

What color is copper typically described as?

• Silver-colored

• Reddish colored

• Blue-colored

• Green-colored

Copper is known for its:

• Dull luster

• Bright metallic luster

• Matte finish

• Transparent appearance

Which of the following properties is NOT true about iron?

• It is a good conductor of heat and electricity.

• It is highly malleable and ductile.

• It is a light metal with low density.

• It can be magnetised.

What is granite primarily made up of?

• Calcite and dolomite minerals

• Silicon dioxide, aluminum oxide, potassium oxide, sodium oxide, and trace elements

• Carbonate concentration

• Acids and CO2

Marble reacts with acids because of its high concentration of what substance?

• Silicon dioxide (SiO2)

• Aluminum oxide (Al2O3)

• Calcium carbonate (CaCO3)

• Potassium oxide (K2O)

What is the atomic number of iron?

• 22

• 26

• 28

• 55