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- 1. Multiple Choice
Adding a second battery to an electromagnet will _____.
decrease the resistance in the wire
decrease the magnetism in the wire
increase the current flowing through the wire
increase the amount of current needed to magnetize the wire
- 2. Multiple Choice
Which of the following statements describes an electric generator?
A magnet is rotated through a coil of wire to produce an electric current.
Electric potential in a rotating coil of wire creates a permanent magnet.
An electrical current causes a coil of wire to rotate in a magnetic field
Forces from a permanent magnet allow a coil of wire to rotate.
- 3. Multiple Choice
Which diagram correctly represents the direction of the magnetic field around a bar magnet?
- 4. Multiple Choice
As the number of turns on an electromagnet is decreased, the pole strength of the electromagnet
Decreases
Increases
Remains the same
- 5. Multiple Choice
Which diagram best illustrates the magnetic field that exists around a current- Carrying wire?
- 6. Multiple Choice
Two magnets move away from each other. What happens to the magnetic attraction between them as they become further apart?
It decreases
it increases
it becomes zero
it does not change
- 7. Multiple Choice
A magnet sticks to a table leg. Based on this information, which material could the table leg be made of?
Iron
wood
copper
aluminium
- 8. Multiple Choice
Which of the circuits shown below will make both light bulbs glow?
- 9. Multiple Choice
Which of the following statements best compares direct current (DC) and alternating current (AC)?
AC flows in only one direction, and DC flows in both directions.
DC flows in only one direction, and AC flows in both directions.
AC comes directly from a power plant, and DC comes from a magnetic field.
DC can maintain a constant voltage over time, and AC loses voltage over time.
- 10. Multiple Choice
Which of the following is most likely to require direct current (DC) for proper operation?
blender
flashlight
electric heater
microwave oven
- 11. Multiple Choice
Which statement correctly describes the relationship that exists between the length of a wire and the amount of current?
Twice the length of wire allows twice the amount of current.
Decreasing the amount of current limits the length of the wire
Twice the amount of current occurs in half the length of wire.
Decreasing the length of the wire decreases the amount of current.
- 12. Multiple Choice
There are three ways in which an object can become electrically charged:
Conduction, Induction, Friction
Which two of these methods require that the objects come into direct contact (touch), in order to transfer charges
1 &2
1& 3
2 & 3
- 13. Multiple Choice
Lightning is an example of objects, clouds, becoming electrically charged due to induction. When the negative charges in the cloud jump to an object containing the opposite charge, we call the sudden flow of electrons ______________
electric generator
sonic boom
static discharge
static friction
- 14. Multiple Choice
Two negatively charged particles are 1 millimeter apart. The electric force between them is 20 Newtons. How will the amount of electric force between the particles change if the particles move closer together
force will increase
force will decrease
force will stay the same
force will disappear
- 15. Multiple Choice
If you cut a magnet in half you will have
Two magnets, one with a north pole only and one with a south pole only
One half will be a magnet and the other will no longer be a magnet
Two magnets, each with a north pole and a south pole
Two pieces but neither will be magnets anymore
- 16. Multiple Choice
When two neutral materials are rubbed together, there is a transfer of electrical charge from one material to the other. The total electrical charge for the system _________________
Increases as electrons are transferred
Increases as protons are transferred
Remains constant (unchanged) as protons are transferred
Remains constant (unchanged) as electrons are transferred
- 17. Multiple Choice
An inflated balloon which has been rubbed against a person's hair is touched to a neutral wall and remains attracted to it. Which diagram best represents the charge distribution on the balloon and wall?
- 18. Multiple Choice
Which of the following statements about gravitational fields is true?
Gravitational fields affect objects only when two objects are touching.
Gravitational fields affect objects only if the objects are not in contact.
Any object that has mass is surrounded by a gravitational field: including a speck of dust, a human body, a paperclip, AND planets.
Only very massive objects, such as Earth, are surrounded by a gravitational field.
- 19. Multiple Choice
If two objects move away from each other. What happens to the gravitational attraction between them?
it decreases
it increases
it becomes equal to zero
it does not change
- 20. Multiple Choice
Which diagram best represents the gravitational field lines surrounding the Earth
- 21. Multiple Choice
What do you call a material in which releases its electrons easily?
conductor
insulator
glass
static
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