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multiple choice

1. which of the following is true about the electric charges on the objects below?



(1 point)

the ball on the right has a positive charge and the ball on the left has a negative charge.

the ball on the left has a positive charge and the ball on the right has a negative charge.

the balls do not have any electrical charge.

the balls both have the same electrical charge.

2. which of the following is true about the metal boxes pictured below?



(1 point)

the magnetic force will be strongest on box #2.

the magnetic force will be weakest on box #3.

the magnetic force will be strongest on box #1.

the magnetic force will be weakest on box #1.

3. anthony is learning about electrical circuits. he has started building the circuit shown below. which of the following items should he add to his circuit to test whether it has a current flowing through?



(1 point)

switch

load or an electrical device

resistor

insulator00

4. when a fan is turned on, it changes electrical energy into energy. (1 point)

motion

magnetic

gravitational

electromagnetic

5. which of the following sentences best compares conductors and insulators. (1 point)

conductors and insulators allow electrons to flow freely.

conductors and insulators do not allow for electrons to flow freely.

insulators obstruct the flow of electrons, whereas conductors allow electron to flow freely.

conductors obstruct the flow of electrons, whereas insulators allow electron to flow freely.

6. how is a parallel circuit different from a series circuit? (1 point)

a parallel circuit only has one path for the circuit to take.

a parallel circuit has more than one path for the circuit to take.

a parallel circuit has a broken path for the circuit to take.

a parallel circuit has an unbroken path for the circuit to take.

7. which of the following boxes would have the strongest gravitational pull on a third object positioned at an equal distance from both boxes?



(1 point)

box a because it is bigger.

box a because it has less mass.

box b because it is smaller.

box b because it has more mass.

8. the ball in the image below is rolling toward the block. the ball will create a disturbance in the stability of the block by knocking it over. which of the following correctly predicts what will happen to the block?



(1 point)

it will be an unstable system because it will not be able to recover from the disturbance.

it will be a stable system because it will be able to recover from the disturbance.

it will be an unstable system because it will be able to recover from the disturbance.

it will be a stable system because it will not be able to recover from the disturbance.

9. according to ohm’s law, what is the resistance of a lightbulb if the applied voltage is 21.0 v and the current is 3.0 amps? (1 point)

24 ohms

7.0 ohms

18 ohms

3.0 ohms

10. a student studying a circuit diagram of a lightbulb, battery, and a switch correctly identifies it as a closed circuit. in this diagram, the lightbulb would be (1 point)

an insulator.

on.

disconnected.

off.

11. the force of gravity on an object on the surface of mars is less than the force of gravity on an identical object on the surface of earth. which of the following explains why this is true? (1 point)

mars has more volume than earth.

earth has more volume than mars.

mars has less mass than earth.

earth has less mass than mars.

12. adding a to an electric circuit would increase the magnetic field around a wire. (1 point)

insulator

solenoid

resistor

conductor

13. items of clothing rub against each other when they are in a clothes dryer. this can sometimes cause a person to feel a small shock when he or she removes the clothes from the dryer. this is due to (1 point)

the dryer not being grounded.

static electricity.

current caused by the electromagnets in the motor.

insulators on the dryer’s electric circuits not containing the current.

true or false

14. a kitchen ceiling light has five lightbulbs on it. when one of the lights goes out, the other four bulbs stay lit. this is an example of a series circuit. (1 point)

true

false