Magnetic field lines flow from a magnet’s A. north pole to south pole B. south pole to north pole C. center to the outside D. outside to the center
Which of the following is characteristic of magnetic material? A. their atoms are all aligned B. their atoms are arranged in magnetic domains. C. they are all nonmetals. D. they are all made of lodestone.
The Earth’s magnetic field helps to protect living things from A. ultraviolet light B. meteors C. the Northern lights D. charged particles
To produce a magnetic field around a copper wire, you have to A. place it in Earth’s magnetic field B. run a current through it. C. supply kinetic energy to it. D. place it near a strong magnet.
An electric current is produced when a wire is A. stationary in a magnetic field B. moving in a magnetic field C. place between the poles of a magnet. D. coiled around a magnet.
In a generator, kinetic energy is converted into A. light energy B. chemical energy C. electrical energy D. nuclear energy
In an AC circuit, the current moves A. back and forth B. from one end of a generator to the other C. from one end of a battery to the other D. in one direction
What is the function of the turbine in a power plant? A. to increase the voltage B. to convert DC to AC C. to cool the steam D. to turn the coil or magnet
Which type of transformer does current pass through before it goes into neighborhoods? A. step-up transformer B. shaft C. step-down transformer D. generator
Put the steps of the scientific method in order A. conclusion B. hypothesis C. data D. problem E. experiment F. research
What are the two general types of energy? A. potential and mechanical B. nuclear and mechanical C. kinetic and potential D. heat and light E. kinetic and light
A qualitative observation A. uses numbers B. is made with your senses C. is always true D. is an inference
A quantitative observation A. uses numbers B. is made with your senses C. is always true D. is an inference
What is the name of the force exerted by a magnet? A. force B. magnetism C. magnetic domain D. attraction
If you cut off the north pole of a magnet, what happens to the remaining part? a. It is no longer a magnet. b. It has two south ends. c. Its domains become random. d. It has a new north pole.
What happens when you bring the south poles of two magnets together? A. they attract B. they pull together C. they repel D. nothing
What happens when you remove a temporary magnet from a stronger magnetic field? A. it becomes a magnet B. it stops being a magnet C. the domains line up D. the poles reverse
You can increase the strength of an electromagnet by A. adding more loops of wire and wrap it tighter B. adding more loops of wire and a bigger piece of iron C. adding more voltage and a bigger piece of iron D. adding more voltage and more loops of wire
What uses electromagnets to convert electrical energy into motion? A. electric motor B. electric generator C. transformer D. commutator
A transformer uses _______ to increase and decrease voltage. A. magnetism B. coils C. current D. resistance
The current that enters your home is _______ because it reverses direction. A. electric current B. direct current C. electromagnet current D. alternating current