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Comprehension Check 1

Decide whether the following statements are true or false.

1. Noble metals are never precious metals.

2. Metalloids are brittle elements resembling metals and conducting heat and electricity.

3. The physical properties of most metals include high density, high strength, little plasticity and considerable elasticity.

4. Metals are used less today because there are a lot of kinds of plastics available.

5. Plastics are lighter, more corrosion-resistant and stronger than metals.

6. Plastics canít be recycled, but metals are recycled.

7. Alloying is an important method of obtaining strength, toughness, resistance to wear, magnetic properties, high electrical resistance or corrosion resistance.

8. Heat treatment consists in heating the metal and then cooling it.

9. Tempering makes metals harder and less brittle.

10. When Concorde was built a material was needed to withstand extreme weather conditions.

Answer the following questions.

1. What kinds of metals do you know?

2. What metals are called precious metals? Why are they called like this?

3. What are the most common physical properties of many metals?

4. What metals are highly radioactive?

5. What happens in a structure of metals when they are heated?

6. What properties of metals make them more popular in comparison with plastics?

7. What are alloys created for?

8. How can the properties of a metal be further improved?

9. What is heat treatment?

10. What makes metals softer and less brittle?

11. What is carried out to meet all engineering specifications and requirements?

12. What alloy was used in Concorde? What else do you know about this plane?

Complete the grid. Look at these five clues and fill in the answers in the spaces provided below. You will find that you make a term-word in the vertical box. (You may hope for the key.)

 

1. Technical values, characteristics (11)

2. Any of a class of mineral substances, such as tin, iron (5)

3. The making or production of goods or materials (11)

4. Carriage (car, lorry, van) for moving goods or passengers (7)

5. Igniting or being ignited (8)

6. Creating or designing something not existing before (9)

7. Being safe, freedom from danger (6)

 

                1          
                2          
                3          
                4          
                5          
                6          
                7          

Match the verbs with the synonyms.



1) important 5) to get a) a lot of e) requirement
2) a number of 6) rapidly b) various f) main
3) need 7) for example c) quickly g) to combine
4) different 8) to mix d) to obtain h) for instance

Match the verbs with the antonyms.

1) strength 5) cheap a) disadvantage e) irregular
2) to heat 6) light b) slowly f) weakness
3) advantage 7) rapidly c) hard g) to cool
4) regular 8) soft d) expensive h) heavy

 

Fill in the correct prepositions.

1. They were interested ___ developing an effective treatment ___ ferrous metals.

2. Melting point is the temperature ___ which a substance will melt.

3. They were offered a wide range ___ facilities and services.

4. What does the strength ___ the material depend ___?

5. There are various methods ___ obtaining special properties ___metals.

6. Many required properties are offered ___ a metal ___ minimum cost.

7. Alloys are metals combined ___ other metals or non-metals to extend the range ___ metalís properties.

Part II


Date: 2015-12-18; view: 484


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Text A. Metals, Alloys, Plastics | Read text B carefully. Pay attention to the words in bold type.
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