Chapter 7 ReviewChapter 7 Review

Test on Friday, December 7!Test on Friday, December 7!

Magnetic field lines flow from a Magnetic field lines flow from a magnet’smagnet’s

A. north pole to south poleA. north pole to south pole B. south pole to north poleB. south pole to north pole C. center to the outsideC. center to the outside D. outside to the centerD. outside to the center

Which of the following is Which of the following is characteristic of magnetic material?characteristic of magnetic material?

A. their atoms are all alignedA. their atoms are all aligned B. their atoms are arranged in B. their atoms are arranged in

magnetic domains.magnetic domains. C. they are all nonmetals.C. they are all nonmetals. D. they are all made of lodestone.D. they are all made of lodestone.

The Earth’s magnetic field helps The Earth’s magnetic field helps to protect living things fromto protect living things from

A. ultraviolet lightA. ultraviolet light B. meteorsB. meteors C. the Northern lightsC. the Northern lights D. charged particlesD. charged particles

To produce a magnetic field To produce a magnetic field around a copper wire, you have around a copper wire, you have

to to

A. place it in Earth’s magnetic fieldA. place it in Earth’s magnetic field B. run a current through it.B. run a current through it. C. supply kinetic energy to it.C. supply kinetic energy to it. D. place it near a strong magnet.D. place it near a strong magnet.

An electric current is produced An electric current is produced when a wire iswhen a wire is

A. stationary in a magnetic A. stationary in a magnetic fieldfield

B. moving in a magnetic fieldB. moving in a magnetic fieldC. place between the poles of C. place between the poles of

a magnet.a magnet.D. coiled around a magnet.D. coiled around a magnet.

In a generator, kinetic energy is In a generator, kinetic energy is converted intoconverted into

A. light energyA. light energyB. chemical energyB. chemical energyC. electrical energyC. electrical energyD. nuclear energyD. nuclear energy

In an AC circuit, the current In an AC circuit, the current movesmoves

A. back and forthA. back and forth B. from one end of a generator B. from one end of a generator

to the otherto the other C. from one end of a battery to C. from one end of a battery to

the otherthe other D. in one directionD. in one direction

What is the function of the What is the function of the turbine in a power plant?turbine in a power plant?

A. to increase the voltageA. to increase the voltageB. to convert DC to ACB. to convert DC to ACC. to cool the steamC. to cool the steamD. to turn the coil or magnetD. to turn the coil or magnet

Which type of transformer does Which type of transformer does current pass through before it goes current pass through before it goes

into neighborhoods?into neighborhoods?

A. step-up transformerA. step-up transformerB. shaftB. shaftC. step-down transformerC. step-down transformerD. generatorD. generator

Put the steps of the scientific Put the steps of the scientific method in ordermethod in order

A. conclusionA. conclusion B. hypothesisB. hypothesis C. dataC. data D. problemD. problem E. experimentE. experiment F. research F. research

What are the two general types What are the two general types of energy?of energy?

A. potential and mechanicalA. potential and mechanical B. nuclear and mechanicalB. nuclear and mechanical C. kinetic and potentialC. kinetic and potential D. heat and lightD. heat and light E. kinetic and lightE. kinetic and light

A qualitative observationA qualitative observation

A. uses numbersA. uses numbersB. is made with your sensesB. is made with your sensesC. is always trueC. is always trueD. is an inferenceD. is an inference

A quantitative observationA quantitative observation

A. uses numbersA. uses numbersB. is made with your sensesB. is made with your sensesC. is always trueC. is always trueD. is an inferenceD. is an inference

What is the name of the force What is the name of the force exerted by a magnet?exerted by a magnet?

A. forceA. forceB. magnetismB. magnetismC. magnetic domainC. magnetic domainD. attractionD. 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 What happens when you bring the south poles of two magnets south poles of two magnets

together?together?

A. they attractA. they attractB. they pull togetherB. they pull togetherC. they repelC. they repelD. nothingD. nothing

What happens when you remove a What happens when you remove a temporary magnet from a stronger temporary magnet from a stronger

magnetic field?magnetic field?

A. it becomes a magnetA. it becomes a magnetB. it stops being a magnetB. it stops being a magnetC. the domains line upC. the domains line upD. the poles reverseD. the poles reverse

You can increase the strength of an You can increase the strength of an electromagnet byelectromagnet by

A. adding more loops of wire and A. adding more loops of wire and wrap it tighterwrap it tighter

B. adding more loops of wire and B. adding more loops of wire and a bigger piece of irona bigger piece of iron

C. adding more voltage and a C. adding more voltage and a bigger piece of ironbigger piece of iron

D. adding more voltage and D. adding more voltage and more loops of wiremore loops of wire

What uses electromagnets to What uses electromagnets to convert electrical energy into convert electrical energy into

motion?motion?

A. electric motorA. electric motorB. electric generatorB. electric generatorC. transformerC. transformerD. commutatorD. commutator

A transformer uses _______ to A transformer uses _______ to increase and decrease voltage.increase and decrease voltage.

A. magnetismA. magnetismB. coilsB. coilsC. currentC. currentD. resistanceD. resistance

The current that enters your home The current that enters your home is _______ because it reverses is _______ because it reverses

direction.direction.

A. electric currentA. electric currentB. direct currentB. direct currentC. electromagnet currentC. electromagnet currentD. alternating currentD. alternating current