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- 1. Multiple Choice
Object X and Object Y are rubbed together. Object X acquires a negative charge. What does Object Y experience?
a gain of protons
a loss of protons
a gain of electrons
a loss of electrons
- 2. Multiple Choice
A positively charged ball is placed an equal distance between two charged objects (1 and 2). In which case will the positively charged ball move toward Object 2?
- 3. Multiple Choice
Which is a true statement about a series circuit?
All the current flows through every part of the circuit.
Every part of the circuit is positively charged.
The current through the circuit can take several paths.
Every part of the circuit is negatively charged.
- 4. Multiple Choice
This diagram represents a circuit with three 20-ohm light bulbs. The battery is 10 volts. If light bulb 3 burns out in the circuit, what will happen to light bulb 1 and light bulb 2?
Light bulb 1 and light bulb 2 will work.
Light bulb 1 and light bulb 2 will not work.
Light bulb 1 will work, but light bulb 2 will not work.
Light bulb 1 will not work, but light bulb 2 will work.
- 5. Multiple Choice
A student wants to build a simple circuit. Which material would be used to design a circuit with the least amount of resistance?
long wires with a thin diameter
long wires with a large diameter
short wires with a thin diameter
short wires with a large diameter
- 6. Multiple Choice
Two magnets are stuck end to end by a magnetic force. Which statement best describes these magnets?
The north poles of the magnets are attracted to each other.
The south poles of the magnets are attracted to each other.
The south pole of one magnet is repelled by the north pole of the other magnet.
The north pole of one magnet is attracted to the south pole of the other magnet.
- 7. Multiple Choice
Which action will have the least effect on the strength of an electromagnet?
changing the amount of current
changing the current’s direction
changing the number of wire loops
changing the size of the metal core
- 8. Multiple Choice
In cars with electric door locks, electromagnets allow the doors to be locked and unlocked at the push of a button. Why is an electromagnet used for this kind of door lock?
Using electromagnets conserves electricity.
Using electromagnets prevents static electric shock.
Electromagnets can easily be turned off.
Electromagnets can attract metals or nonmetals.
- 9. Multiple Choice
Which diagram correctly shows how electrically charged balls will act?
- 10. Multiple Choice
A circuit has 2.25 amps of current and a resistance of 4.00 Ω. What is the voltage difference across the circuit?
9 V
6.25 V
1.78 V
0.56 V
- 11. Multiple Choice
A copper wire is connected across a constant voltage source. Which change will cause an increase in the current flowing through the wire?
an increase in the length of the wire
an increase in the resistance of the wire
an increase in the diameter of the wire
an increase in the insulation around the wire
- 12. Multiple Choice
Which will cause an electromagnetic solenoid to increase its strength?
replacing the wire with an insulator inside the solenoid
increasing the temperature surrounding the solenoid
increasing the number of wire coils in the solenoid
removing the iron core from the solenoid
- 13. Multiple Choice
How could the output voltage of an electrical generator be increased?
by reducing the generator’s rotational speed
by reducing the mechanical work put into the generator
by increasing the resistance of the coils in the generator
by increasing the number of coils in the generator’s electromagnet
- 14. Multiple Choice
This diagram represents a closed series circuit. What would happen if the voltage were doubled?
The current would quadruple.
The current would double.
The current would remain constant.
The current would be reduced by half.
- 15. Multiple Choice
How would decreasing the diameter of the wires in a circuit influence the resistance and flow of electrons in the circuit?
It would decrease the resistance, causing fewer electrons to flow through the circuit.
It would increase the resistance, causing fewer electrons to flow through the circuit.
It would decrease the resistance by allowing more electrons to flow through the circuit.
It would increase the resistance by allowing more electrons to flow through the circuit.
- 16. Multiple Choice
How does a step-down transformer alter the amount of voltage from a power line to a building?
It increases output voltage by increasing the number of wire turns in the secondary coil
It decreases output voltage by decreasing the number of turns in the secondary coil.
It increases output voltage by decreasing the number of wire turns in the secondary coil.
It decreases output voltage by increasing the number of turns in the secondary coil.
- 17. Multiple Choice
A student builds an electromagnet using a variable power source and 40 turns of wire.The electromagnet is used to pick up metal paper clips. The student changes the voltage
and counts the number of paper clips that are picked up. Which table could be the data the student collected?
- 18. Multiple Choice
Which statement best explains why there could be a force of attraction between two electrically charged objects?
because they have like charges
because they have unlike charges
because they have the same number of protons
because they have the same number of electrons
- 19. Multiple Choice
This diagram represents a closed circuit. How much current flows through this circuit?
0.5 A
2 A
18 A
72 A
- 20. Multiple Choice
A series circuit has a current of 3 A. The circuit contains a 12 Ω resistor. What is the voltage of the circuit?
0.25 V
4 V
15 V
36 V
- 21. Multiple Choice
This diagram represents a closed circuit with three light bulbs and a 10-volt battery. If bulb 3 burns out in the circuit, what will most likely happen?
bulb 1 and bulb 2 will continue to glow
bulb 1 and bulb 2 will not glow as brightly
bulb 1 will glow but bulb 2 will not glow
bulb 1 and bulb 2 will not glow
- 22. Multiple Choice
A flashlight bulb connected to a 6 V battery draws 0.5 A current. What is the power used by the flashlight?
1.25 W
3 W
6.5 W
12 W
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