module questions

Module 5 Question 1

0.5 out of 0.5 pointsIn an electrically neutral atom the number of protons in the nucleus is equal to the number of

Selected Answer:

electrons that surround the nucleus.

Answers: neutrons in the nucleus.

electrons that surround the nucleus.

both of these

neither of these

Question 20.5 out of 0.5 points

Strip electrons from an atom and the atom becomes a

Selected Answer:

positive ion.

Answers: negative ion.

positive ion.

different element.

neutral


To say that electric charge is conserved is to say that electric charge

Selected Answer:

can neither be created nor destroyed.

Answers: will interact with neighboring electric charges.

may occur in an infinite variety of quantities.

can neither be created nor destroyed.

is a whole-number multiple of the charge of one electron.


Match the following electrostatic terms with their definitions.

Question Answers Selected Match

Materials that do not allow the passage of electric charge

A. insulator

A. insulator

A material that allows the transfer of charge

C. charged

C. conductor

An object that has a net positive or negative charge is said to be.

E. coservation of charge

E. charged

The unit of electric charge. D. coulumb

D. coulumb

In an isolated system the total charge is conserved.

G. electric potential

G. coservation of charge


A positively charged object repels

Selected Answer:

positively charged objects

Answers: positively charged objects

negatively charged objects

neutral objects

everthing


An electron and a proton

Selected Answer:

attract each other.

Answers: repel each other.

attract each other.

both repel and attract each other

neither attract or repel

each other.


The electrical forces between charges depends on the

Selected Answer:

both of these

Answers: magnitude of electric charges.

separation distance between electric charges.

both of these

none of these


Two electrical charges that are seperated by a distance of 2cm are moved to a distance of 4 cm. What happens to the force between the charges?

Selected Answer:

1/4 the force

Answers: 1/4 the force

1/2 the force

double the force

four times the force


A -2C charge is brought in contact with a +10C charge and are attraced to each other. Which of the charges will have the largest force acting on it?

Selected Answer:

it is the same force on both

Answers: -2C charge

+10C charge

it is the same force on both


A balloon is rubbed against hair and sticks to a wooden wall. What charge does the balloon have?

Selected Answer:

negative

Answers: positive

negative

either

neither


What charging is occuring when clothes dry in the dryer?

Selected Answer:

friction

Answers: friction

this is not an example of charging

induction

conduction


What type of charging is occuring when you touch a friend and experience a shock?

Selected Answer:

Conduction

Answers: There is no charging happening.

Conduction

Friction

Induction


To say that an object is electrically polarized is to say

Selected Answer:

its charges have been rearranged.

Answers: its internal electric field is zero.

its charges have been rearranged.

it is only partially conducting.

it is electrically charged.

it is to some degree magnetic.


An electroscope is charged positively so tht the foil leaves that stand apart. As a negative charge is brought close to the charged electroscope, the leaves

Selected Answer:

fall closer together.

Answers: spread farther apart.

do not move.

fall closer together.

change color.


Which of the following is an insulator?

Selected Answer:

plastic

Answers: silver

plastic

the graphite in a pencil

more than one of the object listed is are

insulators.

human body


Which of the following materials is a conductor?

Selected Answer:

gold

Answers: gold

glass

wood

more than one of the objects listed is a conductor.

rubber

Module 6


The convention is that current in a circuit flows

Selected Answer:

from the positive terminal to the negative terminal

Answers: from the positive terminal to the negative terminal

from the negative terminal to the positive terminal

either way, it does not matter.

Question 21 out of 1 points

Match

Question Answers Selected

Match

Power is measured in __________ C. resistance

C. watts

Continious flow of charge is________ D. power

D. current

Objects like light bulbs slow down the the flow of electric current by providing ________

G. short circuit

G. resistance

Rate at which energy is converted from one form to another is _________.

F. complete circuit

F. power

Resistance is measured in ___________. E. ohms

E. ohms

A continuous path from one end a battery to the other end of the battery ___________.

B. current

B. complete circuit

A path in an electric circuit that has very little resistance is ________.

A. watts

A. short circuit


An ampere is a unit of electrical

Selected Answer:

current.

Answers: pressure.

resistance.

current.

all of these

none of these

Question 40 out of 0.5 points

A 10 ohm resistor has 5 A current in it. What is the voltage across the resistor?

Selected 10 V

Answer:

Answers: 10 V

20 V

15 V

5 V

more than 20 V


A 10 ohm resistor connected to a 120-V power supply. What is the current through the circuit?

Selected Answer:

12 A.

Answers: 120 A.

12 A.

10 A.

1 A.

none of these


Which statement about this image is not true?

Selected Answer:

The light bulbs are wired in series.

Answers: If one of the bulbs burns out it will not affect the other bulb.

The light bulbs are wired in parallel.

There must be a current because the bulbs are on.

The light bulbs are wired in series.


What type of circuit is pictured below?

Selected Answer:

parallel

Answers: short

combination

parallel

series


The circuit below has three 9 ohm resistors. What is the equivalent resistance of this circuit?

Selected Answer:

1/3 ohms

Answers: 3 ohms

18 ohms

1/3 ohms

27

ohms


Three resistors (R1, R2 and R3) are placed in the configuration as shown below. What is the equivalent resistance of the circuit if R1=5 Ohms, R2= 10 Ohms, R3 = 5 Ohms?

Selected Answer:

20 Ohms

Answers: 20 Ohms

10 Ohms

5 Ohms

2 Ohms


Two identical bulbs are connected in series to a new battery. Which bulb is the brightest?

Selected Answer:

They are equally bright.

Answers: They are equally bright.

The one closest to the positive end of the battery.

The one closest to the negative end of the battery.

Neither will lightbecause the battery is new.


As more lamps are put into a series circuit, the brightness of the bulbs

___________.

Selected Answer:

decreases.

Answers: stays the same.

increases.

decreases.


When two lamps are connected in series to a battery, the electrical resistance that the battery senses is

Selected Answer:

more than the resistance of either lamp.

Answers: more than the resistance of either lamp.

less than the resistance of either lamp.

none of these


In an electric circuit, the safety fuse is connected to the circuit in

Selected Answer:

series.

Answers: series.

parallel.

not enough information

combination


When two lamps are connected in parallel to a battery, the electrical resistance that the battery senses is

Selected Answer:


Answers: more than the resistance of

either lamp.


none of these


In a household circuit the lights, outlets, and appliances are wired in _____ with each other and in _____ with a fuse or circuit breaker.

Selected Answer:

parallel ... series

Answers: parallel ... series

series ... series

series ... parallel

parallel ... parallel


Alternating current is normally produced by a

Selected Answer:

generator.

Answers: battery.

generator.

both of these

neither of these


Which of the following lightbulbs draws the most current?

Selected Answer:

100 Watt

Answers: 60 Watt

45 Watt

100 Watt

They all have the same current

Sunday, December 7, 2014 12:54:54 AM CST

Module 7


Match the following magnetic terms.

Question AnswersSelected Match

Magnet constructed by wrapping wire around iron.

D. pole

D. electromagnet

Space that surrounds a magnetic object.

A. electromagnet

A. magnetic field

Unit used to measure magnetic field. C. generator

E. tesla

Part of a magnet, usually labeled North or South.

B. magnetic field

B. pole

A device that uses magnetism to create electricity

E. tesla

C. generator


Like kinds of magnetic poles repel while unlike kinds of magnetic poles

Selected Answer:

attract.

Answers: may attract or repel.

attract.

repel also.


Which pole of a compass needle points to a south pole of a magnet?

Selected Answer:

north pole.

Answers: south pole.

north pole.

both of these


An iron nail is more strongly attracted to the

Selected Answer:

north or south pole—no difference really.

Answers: south pole of a magnet.

north pole of a magnet.

north or south pole—no difference really.


Which is attracted to a magnet

Selected Answer:

All of the above

Answers: Loadstone

Stainless Steel

Ferreomagnetic Materials

All of the above


If a bar magnet is broken into two pieces, each piece

Selected Answer:

has two magnetic poles

Answers: has only one magnetic pole

is no longer magnetic

has an electric charge

has two magnetic poles


The magnetic force depends on the

Selected Answer:

both of these

Answers: magnitude of magnetic poles.

separation distance between the magnetic poles.

both of these

none of these


The magnetic force is strongest

Selected Answer:

Closer to a magnet

Answers: Closer to a magnet

Farther away from a magnet

Constant everwhere

Strong as long you are in the magnetic field range


The magnetic north pole of the earth is nearest

Selected Answer:

Australia.

Answers: Australia.

the Hudson Bay region of Canada.

both of these


Magnetic domains normally occur in

Selected iron.

Answer:

Answers: silver.

copper.

iron.


The source of all magnetism is

Selected Answer:

moving electric charge.

Answers: ferromagnetic materials.

tiny pieces of iron.

moving electric charge.

none of these


Magnetism is most closely related to

Selected Answer:

electricity

Answers: sound

light

electricity

water waves


Which is a property of electromagnets?

Selected Answer:

They can be turned on and off.

Answers: They can produce large magnetic fields.

All of these are properties of electromagnets

They can be turned on and off.

The strength of their magnetic fields can be varied by varying the current.


How can you increase the strength of an electromagnet?

Selected Answer:

Both of the above

Answers: Increase the current

Increase the number of loops

Both of the above

None of the above


What is the direction of the magnetic field pictured below?

Selected Answer:

Into the page

Answers: To the right

To the left

Out of the page

Into the

page


Thrust a magnet into a coil of wire and the coil

Selected Answer:

has a current in it.

Answers: coil becomes a magnetic monopole.

creates a spark of electricity

has a current in it.

creats an electrical resistance.


Magnetic field lines about a current-carrying wire

Selected Answer:

circle the wire in closed loops.

Answers: extend radially from the wire.

circle the wire in closed loops.

both of these


Moving electric charges in a wire creates ____________.

Selected Answer:

a magnetic field.

Answers: a magnetic monopole

a magnetic field.

a transformer

a generator

Sunday, December 7, 2014 12:56:56 AM CST

Module 11


What color are high mass stars when they are formed?

Selected Answer:

blue

Answers: green

blue

yellow

red


The Sun tends to bloat outward by nuclear fusion, and contract due to

Selected Answer:

gravitation.

Answers: reduced gaseous pressures.

nuclear fission.

its relatively slow spin.

gravitation.

mass decrease.


What is the name of the galaxy we are located in?

Selected Answer:

Milky Way

Answers: Spirial-Barred

M80

Milky Way

Andromeda


Which of the following is the smallest?

Selected Answer:

black dwarf

Answers: Jupiter

red dwarf

red supergiant

black dwarf


How many galaxies are there in the universe?

Selected Answer:

hundreds of billions

Answers: ten thousand

hundreds of billions

one

two hundred


How many stars are there in the Milky Way Galaxy

Selected Answer:

200 billion

Answers: 1

10 million

100 thousand

200 billion


A black hole is

Selected Answer:

all of the above

Answers: a small region that has the mass of many galaxies.

the remains of a giant collapsed star.

an empty region of space with a huge gravitational field.

all of the above


If the Sun collapsed to become a black hole, the earth's gravitational attraction to it would be

Selected Answer:

no different.

Answers: more.

no different.

less.


Pluto is a

Selected Answer:

dwarf planet

Answers: dwarf planet

asteroid

comet

planet


Which type of planets are least dense?

Selected Answer:

Gas giants

Answers: Gas giants

Terrestrial

Dwarf

They all have the same density


Asteroids orbit the

Selected Answer:

Sun.

Answers: Earth.

Moon.

Sun.

all of these

none of these


Is the Earth moving?

Selected Answer:

It moves both by rotating on its axis and revolving around the sun.

Answers: yes, it rotates on its axis

yes, it revolves around the sun

It moves both by rotating on its axis and revolving around the sun.

The Earth is still, if it were moving we would fall off.


The planet that is most tipped to its orbital plane is

Selected Answer:

Uranus.

Answers: Uranus.

Neptune.

Jupiter.

Mars.

Saturn.


The age of the Sun is about

Selected Answer:

5.5 billion years.

Answers: 5.5 billion years.

7000 years.

5.5 trillion years.

5.5 million years.

more than 5.5 trillion years


In a model of a solar system if the Earth is the size of a basketball, how large should the Moon be?

Selected Answer:

The size of a baseball

Answers: The size of a

cantelope

The size of a baseball

The size of a golfball

The size of a marble


The reason we don't have eclipses monthly is because of the

Selected Answer:

different orbital planes for Earth and the Moon.

Answers: tapering of the Sun's rays.

different orbital planes for Earth and the Moon.

relatively close distance of the Moon and Earth.

23° tilt of the earth's axis.

relatively long distance to the Sun.


The fact that one side of the Moon always faces Earth is evidence that while revolving about the earth it

Selected Answer:

rotates about its axis.

Answers: rotates about its axis.

does not rotate about its axis.


Polaris is always directly overhead

Selected Answer:

the north pole.

Answers: any location north of the equator.

the north pole.

the equator.


Which phase of the moon is directly after the waning gibbous?

Selected Answer:

3rd quarter

Answers: Waning crescent

Full moon

1st quarter

3rd quarter


We do not see stars in the daytime because

Selected Answer:

skylight overwhelms starlight.

Answers: skylight overwhelms starlight.

of the lack of contrast with moonlight.

the solar wind obscures their view.

they simply don't exist in the daytime part of the sky.

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