- 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?
- 4. When an ebonite rod is rubbed with animal fur, the rod becomes negatively charges. Why? a. Positive charges are transferred from the fur to the rod b. Negative charges are transferred from the rod to the fur. c. Negative charges are created on the surface of the rod d. Negative charges are transferred from the fur to the rod. e. Positive charges are transferred from the rod to the fur. 5. A glass rod is rubbed with a cotton cloth. Which statement is true? a. The glass rod will become negatively charged b. The glass rod will become positively charged c. The cotton will have a neutral charge d. The cotton will become positive. e. Both will remain neutral 6. Compared to polyester.nylon will; a. Lose electrons more easily b. Lose electrons with more difficulty c. Lose protons more easily d. Lose protons with more difficulty e. Not enough information is given 7. Which of the following statements is true? a. Electrons are more able to move easily in a conductor. b. Electrons move more easily in an insulator c. Electrons are tightly held by a conductor d. Protons move more easily in a conductor e. Protons move more easily in an insulator 8. Which of the following is a good conductor a. Glass b. Wood c. Copper d. Fur e. Rubber
- 1. Which of the following is a positively charged particle? a. Anion b. Proton c. Neutron d. Atom e. Electron 2. What charge does an object have if it has excess electrons? a. Positive b. Negative c. Neutral d. None of the above e. Not enough information is given 3. What type of particle is the only one that moves between atoms in a substance? a. Anion b. Proton c. Neutron d. Atom e. Electron
- Give a reason why when using a metre rule to measure length the eye should be positioned vertically above the mark where the reading is being taken. (1 mark __
- 12. Trace the energy conversions involved when a cat hits a small bell with its paw. __
