IV. READING (20 points)a) Put the following words into the certain gaps:
METALS All materials are divided into ferrous metals and 1) … metals. Ferrous metals are metals and alloys the main component of which is 2) …. The classification of ferrous metals includes iron, steel and its alloys. White cast iron is used in those machines which require some resistance to abrasion. Cast iron is chiefly used in 3) … for compressed members of construction such as the supporting members of trusses, the members of arches and vaults. Alloyed steel is steel to which elements not present in carbon steel have been added, or in which the content of manganese or silicon is increased above that in carbon steel. This kind of 4) … is widely used in machine-building. Non-ferrous metals are metals and alloys the main 5) … of which is not iron but some other element such as copper, aluminium and others. Some of their characteristics are: high electric and heat conductivity, high corrosion 6) …, non-magnetic qualities, 7) … and easiness of fabrication. Copper is found in 8) … in the form of ores but it is sometimes found in pure state. Pure copper is of reddish color and it has corrosion resistant qualities. Copper is the best 9) … of electricity. An alloy of copper and tin is called 10) …. This metal is often used for making various ornaments.
b) Define whether these sentences are true (T) or false (F): 1. There are three groups of metals. 2. Bronze consists of two elements. 3. Iron is the basic element of non-ferrous metals. 4. Copper is possible to find in nature. 5. Copper us used for building arches and vaults. 6. Alloyed steel is widely used in machine-building. 7. One of the characteristics of non-ferrous metals is high electric and heat conductivity. 8. Ferrous metals are iron, steel and its alloys. 9. Copper hasn’t got corrosion resistance qualities. 10. Steel is used for making various ornaments. Total Score – 40 points
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