1. Which of these is not a conductor of electricity?

• A. graphite
• B. steel
• C. sea water
• D. plastic

2. Static electricity can be produced by friction on....

• A. conductors and insulators.
• B. conductors only.
• C. insulators only.
• D. neither conductors or insulators.

3. All atoms contain positive and negative charges. Which answer below correctly names these charges?

4. Which of these anwers describes the force between charges of differnt polarities? (+ and -).

5&6. The plastic in the picture is being rubbed by the cloth. The plastic becomes positively charged.

5. Which of these sentences describes what is being transferred?

• A. Positive charges transferred to the cloth.
• B. Negative charges transferred to the cloth.
• C. Positive charges transferred to the plastic.
• D. Negative charges transferred to the plastic.

6. What change describes a different plastic being given a negative charge when being rubbed by a cloth?

• A. Positive charges transferred to the cloth.
• B. Negative charges transferred to the cloth.
• C. Positive charges transferred to the plastic.
• D. Negative charges transferred to the plastic.

7. Static electricity can be a problem, but which of these applications uses static electricity?

• A. Ink jet printers
• B. Radiotherapy treatments
• C. Mobile (cell) phones
• D. Loudspeakers

8. Static electricity produced by friction can produce sparks. which of these best describes a reasonable potential hazard of static electricity?

• Possible fatal shock from the spark.
• Igniting fuel at a petrol station.
• Force produced by the spark can knock a person over.
• Spark can produce a surge in kitchen appliances and destroy them.

9+10. Electronic engineers and technicians often wear a static dicharge band around the wrist to prevent static electrcicity from damaging delicate circuit components.

The wire is connected to the ground to allow excess static to discahrge along the cable.

What is the name usually given to this kind of safety wire?

• A. Earth wire.
• B. Live wire.
• C. Return wire.
• D. Neutral wire.

10. The technician picks up a positive static charge through friction from a nylon shirt. Which of the statements below best describes how this charge is neutralised through the wire/cable?

• A. Postive charges flow from the wrist down to the ground to neutralise the technician.
• B. Postive charges flow up from the ground to the wrist to neutralise the technician.
• C. Negative charges flow from the wrist down to the ground to neutralise the technician.
• D. Negative charges flow up from the ground to the wrist to neutralise the technician.