16. Choose as many words from the table оf ex. 1 as you can and form sensible sentences in Present Simple Passive and present Continuous Passive (affirmative, negative and interrogative).

For example: The number of particles is unlimited.

17. Match the terms in Table a with their definitions in Table b

Table A

1. classification

2. insulate

3. semiconductor

4. particle

5. conduction

Table B

1. The process by which heat or electricity is directly transmitted through a substance when there is a difference of temperature or of electrical potential between adjoining regions, without movement of the material.

2. A solid substance that has conductivity between that of an insulator and that of most metals, either due to the addition of an impurity or because of temperature effects. Devices made of semiconductors, notably silicon, are essential components of most electronic circuits

3. The action or process of classifying something according to shared qualities or characteristics.

4. Any of various fundamental subatomic and most basic constituents of matter, including those that are the smallest, and those that transmit one of the four fundamental interactions in nature (gravitational, electromagnetic, strong, and weak).

5. Prevent the passage of electricity to or from (something) by covering it in nonconducting material.

18. Translate paying attention to the meanings of the word “one”.

For example: There are many ways of classifying materials. The one we shall speak about is based on the ability of a material to conduct electricity.— Существует много способов классификации материалов. Тот (способ), о котором мы будем говорить, основан на способности материала проводить электричество.

1. There are many types of robots; the ones, we are going to discuss today, are the robots of the 3-rd gen­eration.

2. The new computer is more powerful than the one put into service last year.

3. That semiconductor device is more efficient than the one under consideration.

4. Which of the gadgets is more useful than the new one?

5. There can be many schemes of different devices; the one given in Unit 2 shows the electron flow in a vacuum tube.

19. Change the form of the personal pronouns given in brackets

For example: Physicists should work in order to realize (they) ambitions. - Physicists should work in order to realize their ambitions.

1. Today we shall speak about classifying materials according to (they) electrical properties.

2. There are many ways of classifying (they).

3. The one we shall speak about is based on (it) ability to conduct electricity.

4. Do only electrons take part in (it)?

5. Сonductivity is the result of the motion of (they).

6. It is directly proportional to the number of (they) inside the material that can be set in motion.

7. There are materials which have very few of (they).

8. Materials are classified according to (they).

9. Many of (they) were discussed in the lab.

10. (It) number is not relevant.

11. The scientist (he) proved the results to be correct. He didn’t need help of any other staff.

12. (We) results in accomplishing this project were phenomenal.

13. These experiments were (they).