Transcript Electricity and Magnetism Posttest

Electricity and Magnetism
Posttest
CDHOOD
1. Convert to meters: 6.7 decameters
A.670 meters
B.6,700 meters
C.0.67 meters
D.67 meters
2. What is the reading shown on the
triple beam balance below?
A.313.6 g
B.310.6 g
C.310.3 g
D.424.6 g
3. Examine the table below. If the trend in the
below table continues in the future, what do
you think will happen?
A. Manufacturers will stop producing DVDs.
B. VHS tapes will eventually not be sold anymore.
C. The sales of DVDs will go down.
D. The sales of VHS tapes will pick up.
4. Alexis was interested in the way mirrors reflect. The
living room of Alexis' house had one big window in the
front, and a very large mirror on the back wall. Alexis
hypothesized that the room would heat up faster in the
morning with the mirror on the wall than it would if the
mirror were covered with a sheet that was the same
color as the walls. What will make Alexis' hypothesis
valuable?
A. It will be valuable only if it is proved correct.
B. It cannot be valuable because the investigation is in her
house and not in the science lab.
C. It will be valuable only if it is proved incorrect.
D. Any testable hypothesis is valuable.
5. As the masses of two objects
increase, how does the gravitational
force between the two objects
change?
A. The gravitational force increases.
B. The gravitational force stays the same.
C. The gravitational force decreases.
D. The gravitational force begins to repel the
objects.
6. Two negatively charged particles are
placed close together. Which of the
following best describes their interaction?
A. They will attract each other.
B. They will repel each other.
C. They will become magnetic.
D. They will remain the same distance apart.
7. What holds a moon in its orbit?
A. the gravitational pull of the planet it orbits
B. its own internal magnetism
C. the heat generated by the planet it orbits
D. the gravitational pull of the star it orbits
8. Which of the following objects exerts gravitational
force?
I.
II.
III.
IV.
V.
A.IV and V only
B.I, II, and III only
C.I and II only
D.I, II, III, IV and V
the Sun
the Earth
the Moon
a basketball
an apple
9. What will happen to the second light
bulb if the first light bulb burns out?
A. It will also go out.
B. It will get brighter.
C. It will explode.
D. Nothing will change.
10. To complete an electrical circuit, there are a
few necessary elements. An electrical circuit can
demonstrate energy flow even if it is missing
________.
A. a receiver
B. a switch
C. a power source
D. connecting wires
11. Which of these is an advantage of
parallel circuits over series circuits?
A. If the battery dies, energy can still flow
through the receivers.
B. The current is stronger through the receivers.
C. The voltage is stronger from the battery.
D. If one receiver stops the energy flow, the
other receivers can still work.
12. What will happen to the second light
bulb if the first light bulb burns out?
A. Nothing will change.
B. It will also go out.
C. It will explode.
D. It will get brighter.
13. In a closed electrical circuit, what
visible evidence indicates that energy
is flowing?
A. connected wires
B. a closed switch
C. a new battery
D. a light bulb lighting up
14. The following diagram shows a wire with a
magnetic field around it. Which of the following
describes the direction of the current?
A. from A to B
B. anticlockwise
C. from B to A
D. clockwise
15. The following diagram shows two bar
magnets. Which of the following describes
the interaction between the two magnets?
A. The magnetic fields will cancel each other out
B. The magnets will attract each other.
C. There will be no interaction between the
magnets.
D. The magnets will repel each other.
16. The following diagram shows a permanent
bar magnet. What would happen to the
magnetic field if the bar magnet were cut in half
along the center line?
A. Both halves would have only south poles.
B. Its magnetism would be destroyed.
C. One half would be the south pole and the other half
would be the north pole.
D. Each half would have a north pole and a south pole.
17. The following diagram shows a magnetic field going
into the page. A negatively charged particle enters the
field in the direction shown in the diagram. How will the
magnetic field affect the path of the charged particle?
A. The magnetic field will not
change the path of the particle.
B. The magnetic field will be
canceled out by the charge of
the particle.
C. The magnetic field will repel
the particle and it will not enter
the field.
D. The magnetic field will bend
the path of the particle.
18. A metal detector works by creating a
magnetic field. When an activated detector
comes near a piece of metal, what most likely
happens so that it is detected?
A. The metal becomes hot, and the detector senses the
temperature change.
B. The magnetic field creates a current in the piece of metal,
and when the detector comes near the current it completes a
circuit in the detector.
C. The metal is magnetically attracted to the metal detector,
and the metal detector pulls the metal toward itself.
D. The metal interrupts or changes the field, and the detector
senses the change.
19. Look at the electromagnet below. Which of
the following materials would generate the
strongest magnetic field if used as the core?
A. silicon
B. aluminum
C. carbon
D. iron
20. What is the relationship between
electricity and magnetism?
A. A moving magnet creates a magnetic field, and
an electric current makes electrons stand still.
B. A moving magnet creates a current, and a still
magnet creates a current.
C. An electric current creates a magnetic field, and a
moving magnet creates a current.
D. An electric current creates a magnetic field, and
electrons that are motionless create a magnetic
field.
Reminders
• Make sure that you have written down your point
code from the front board
• All pretests are due to be completed no later than
Monday @9:30 am.
• If completed the grade will not count against your
average.
• If incomplete you will receive a 0 major.
• Make sure that you leave your science workbooks
on the shelf to be graded.
• Make sure that you get your agenda signed
before leaving.