9. What is static electricity? a. Aform of energy that results from the interaction of protons b. A form of energy that results from the interaction of protons c. Aform of resistance that results from the interaction of atoms d. Anon-moving charge formed through friction between two different objects e. Charge that moves 10. Which is not true about sparks? a. Sparks can cause explosions at grain elevators b. Sparks are not dangerous in any way c. Sparks can cause damage to sensitive electronics d. Sparks can ignite gases used for anesthesis is an ope thing room e. Sparks candarage paramation 11. Which of the following is trun? a. Lightning bolts, eglint boarks caused by a bulic charge b. Static cling causes plastic wrap to stick to your lunch c. People who work on computers must reduce net static charges with a grounding plug to avoid damage d. Static cling is never useful e. Static cling helps electrostatic dusters pick up dirt off the floor 12. How does a clothing dryer generate static charge on clothing? a. The current providing heat in the dryer generates static charge b. The materials tumble and rub past one another c. Charging by friction occurs in the dryer d. Both Band C e. A clothes dryer does not generate static 13. What is an electroscope? a. Adevice that detects charge b. Can be either a metal leaf electroscope or a pithball electroscope c. Start neutral and move when charge is detected d None of the above e. All of the above 14. Why must a fuel truck be grounded before it can be fuelled? a. To limit the bulld-up of static electricity, which could cause a spark or explosion b. To keep the truck perfectly still c. To reduce friction between the pavement and the tires d. Static build on the rubber tires e. It is not necessary to ground a fuel truck 15. What will happen when; a. acetate is rubbed with fur? b. Rubber is rubbed with cotton? c. Silk and wool are rubbed together? 16. Which kind of combs are best to use in the winter? Plastic or metal?Why? 17. When an object is charged by contact.what kind of charge is given as compared to the charging object? 18. Why does a shock happen when a charged person touches a doorknob?How could this be prevented? 19. Why are dust particles attracted to newly polished cars?

9. **d. A non-moving charge formed through friction between two different objects.** Static electricity is a buildup of electric charge on the surface of an object. It's created when two materials are rubbed together, causing electrons to transfer from one to the other.<br /><br />10. **b. Sparks are not dangerous in any way.** Sparks are a sudden flow of electricity, which can ignite flammable materials, damage electronics, or even cause injury.<br /><br />11. **a, b, c, and e are all true.** Lightning is a large-scale static discharge. Static cling makes plastic wrap stick and can attract dust, making electrostatic dusters useful. People working with sensitive electronics need to ground themselves to prevent static damage. Only **d. Static cling is never useful** is false.<br /><br />12. **d. Both B and C** The tumbling action in the dryer causes friction between the clothes, leading to a buildup of static charge (charging by friction).<br /><br />13. **e. All of the above** An electroscope is a device used to detect electric charge. Both metal leaf and pithball electroscopes exist, and they work by showing movement in their components when a charge is present. They start neutral and then react to the presence of a charge.<br /><br />14. **a. To limit the build-up of static electricity, which could cause a spark or explosion.** Grounding a fuel truck allows any static charge to dissipate into the ground, preventing a potentially dangerous spark in the presence of flammable fuel vapors.<br /><br />15. When these materials are rubbed together:<br /> * **a. acetate rubbed with fur:** Acetate becomes negatively charged, and fur becomes positively charged.<br /> * **b. Rubber rubbed with cotton:** Rubber becomes negatively charged, and cotton becomes positively charged.<br /> * **c. Silk and wool rubbed together:** Silk becomes negatively charged, and wool becomes positively charged.<br /><br />16. **Metal combs are best in winter.** Metal is a conductor, so it allows static charge to dissipate rather than build up on the comb and cause flyaway hair, which is more common in dry winter air.<br /><br />17. When an object is charged by contact, it receives the **same** charge as the charging object. For example, if a positively charged object touches a neutral object, the neutral object will also become positively charged.<br /><br />18. A shock happens when a charged person touches a doorknob because the built-up static charge suddenly discharges through the conductive doorknob to the ground. This can be prevented by touching a grounded metal object *before* touching the doorknob, allowing the charge to dissipate slowly and harmlessly.<br /><br />19. Dust particles are attracted to newly polished cars because the polishing process can create a static charge on the car's surface. This charge attracts the dust particles, which are often neutral or carry a slight opposite charge.<br />