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- 1. Multiple ChoiceMin tapes a piece of string to each of two ping-pong balls. He hangs the balls so that they are close to one another but do not touch. Later, he finds that they have pulled together. They are now touching. What could explain why the two balls are now touching?They have both lost their charges.They have gained opposite charges.They have both gained a positive chargeThey have both gained a negative charge
- 2. Multiple ChoiceCurtis uses a wool cloth to give a balloon a negative charge. What will happen when he holds the balloon near the wall, and why?The balloon will stick to the wall because a negatively charged object is attracted to an uncharged objectThe balloon will stick to the wall because a negatively charged object is attracted to another negatively charged object.The balloon will not stick to the wall because a negatively charged object is repelled by an uncharged objectThe balloon will not stick to the wall because a negatively charged object is repelled by another negatively charged object.
- 3. Multiple Choice
Aisha wanted to know how positive and negative charges affect balloons. The balloons shown below are part of her investigation. What are the charges on the balloons?They are both positiveThey are both negativeThey are both unchargedOne is positive and one is negative - 4. Multiple ChoiceWhat form of energy cooks food in a solar cooker?ChemicalElectricalLightMechanical
- 5. Multiple ChoiceTo conserve energy or if they don’t have a clothes dryer, some people hang their laundry outside to air dry. Which of the following is the most optimal day to hang laundry?a cold, rainy daya cold, cloudy daya warm, sunny daya warm, cloudy day
- 6. Multiple ChoiceAn electron is the particle most easily removed from an atom. What is the electric charge of a neutral atom from which an electron has been removed?NegativeNeutralNucleusPositive
- 7. Multiple ChoiceWhy do two socks sometimes stick together in a dryer?Both socks have a positive charge.Both socks have a negative charge.Protons move from one sock to another.Electrons move from one sock to another.
- 8. Multiple ChoiceWhich is true about how a charged object interacts with a neutral object?The charged object becomes unchargedThe neutral object remains neutral.They repel each other.They attract each other.
- 9. Multiple ChoiceIn a three-pronged plug, one flat prong carries current from the supply that enters the electrical outlet, and the other returns the current to the service panel of the building. The round prong helps protect people from electrical shocks. What has a purpose similar to that of the round prong?magnetgeneratorthe plug's plastic coveringthe holes in the flat prongs
- 10. Multiple ChoiceA material that allows an electric current to flow through it is an electrical conductor. A material through which an electric current cannot flow easily is called an insulator. Which statement best describes the difference between an insulator and a conductor?An insulator has a static charge, and a conductor does not.A conductor contains more electrons than an insulator.A conductor is a metal, and an insulator is any material that is not a metalAn insulator does not have electrons that are free to move, and a conductor does.
- 11. Multiple ChoiceAn electric clock in a classroom will not run if it is not plugged into an electric outlet. What does the clock get from the electric current from the outlet?BatteriesChemicalsEnergyTime of Day
- 12. Multiple ChoiceWhich energy transformation occurs when a fan is plugged into a wall?heat energy into motion energyelectrical energy into sound energyenergy of motion into sound energyelectrical energy into energy of motion
- 13. Multiple ChoiceYou use energy transformations every day. Which of these is a way that you would use the transformation of electrical energy to motion energy?watching your favorite show on televisiontaking an elevator to the top of a tall buildinglistening to your MP3 player while you walk to schoolturning on the lamp on your desk so you can see to do your homework
- 14. Multiple ChoiceDarrell made toast for breakfast by putting a slice of bread into the toaster and turning it on. Which energy transformation did he use to make a piece of toast?heat energy into electrical energyelectrical energy into heat energylight energy into electrical energyelectrical energy into light energy
- 15. Multiple ChoiceAn object that has thermal energy can lose some of that energy. Which answer describes an example of the thermal energy of a material decreasing?eggs cooking in a panwater freezing into icesnow melting in the springa ball bouncing on the floor
- 16. Multiple ChoiceElectric companies send electric power through an electric power grid to your home. The illustration below shows some of the parts of an electric power grid. At which part of this grid is electrical energy produced from other types of energy?subsationdistribution linetransmission linesgenerating station
- 17. Multiple ChoiceThe diagram below shows a simple electromagnet. What effect does decreasing the number of coils around the nail have on the strength of the electromagnet?It becomes weakerIt becomes strongerIt remains the same strength.It depends how many coils are removed
- 18. Multiple ChoiceThe picture below shows a spring toy. If you push down the toy and then release it, the toy would pop up through the air. Which types of energy does the spring toy have as it flies through the air?electrical and thermalkinetic and potentialpotential and electricalthermal and kinetic
- 19. Multiple ChoiceWhat type of energy does a book sitting on a shelf have?PotenialKinetic
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