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ENERGY, ELECTRICITY & MAGNETISM
PRACTICE PROBLEMS
Selected Response (2 points each)
Write the letter of the best answer on the line provided or on the scantron sheet.
_____ 1. All energy transformations are less than 100% efficient. Therefore, any time an energy
transformation occurs, __________energy is released.
a.
b.
c.
d.
potential
light
nuclear
thermal
_____ 2. Light energy is an example of which form of energy?
a. thermal
b. mechanical
c. electromagnetic
d. nuclear
_____ 3. Kinetic energy is best defined by which of the following?
a. energy of position
b. energy of action/movement
c. stored energy
d. energy in a stretched rubber band
_____ 4. A ball is dropped from the top of a building. When is its potential energy the greatest?
a. right before it is dropped
b. midway between the top of the building and the ground
c. just before it hits the ground
d. The potential energy is the same at all times.
_____ 5. As the ball is falling, which of the following occurs?
a. Potential energy is converted to kinetic energy.
b. Kinetic energy is converted to potential energy.
c. Potential energy remains constant.
d. Kinetic energy remains constant.
_____ 6. Water moving in a river and wind blowing are examples of what form of energy?
a. chemical
b. electromagnetic
c. mechanical
d. nuclear
_____ 7. All negative charges of an atom are located
a. in the nucleus.
b. in the protons.
c. outside of the nucleus.
d. in the neutrons
_____ 8. The particles of an atom that have charges are
a. the proton and neutron.
b. the electron and the neutron.
c. the electron and proton.
d. the proton, neutron, and electron.
_____ 9. The Law of Electrostatics states
a. two objects with like charges will be attracted to each other.
b. two objects with like charges will be repelled from each other.
c. two objects with unlike charges will be repelled from each other.
d. two objects will always be attracted to each other because of gravity.
_____ 10. Electrostatic induction occurs
a. when a charged object contacts a neutral object.
b. when two objects are rubbed together.
c. when a neutral object is brought into the electric field of a charged object.
d. when a magnetic field is created around a circuit.
______ 11. A neutral object can be statically charged by which of the following processes?
a. water
b. friction.
c. air
d. all of the above.
_____ 12. Which of the following statements best describes the purpose for electrical circuits?
a. Electrical circuits transform electrical energy to light.
b. Electrical circuits transfer chemical energy.
c. Electrical circuits transfer electrical energy.
d. Electrical circuits transform electrical energy with no heat loss.
_____ 13. Which of the following is/are example(s) of a resistor in an electrical circuit?
a. wire
b. light bulb
c. buzzer
d. all of the above
_____ 14. What is an electric field?
a. the area around the nucleus in which the electrons move
b. the area around a magnet that is affected by its magnetism
c. the flow of electrons through a circuit
d. the area around an object that is affected by its electric charge
_____ 15. In a circuit, when the resistance increases,
a. the current increases.
b. the current decreases.
c. the current remains constant.
d. the voltage increases .
Use Figure 1 for Questions 16 and 17.
Figure 1
_____ 16. The illustration in Figure 1 shows
a. a parallel circuit.
b. a simple circuit.
c. a vertical circuit.
d. a series circuit.
_____ 17. Which type of electrical circuitry would be best for wiring a home?
a. series circuits
b. parallel circuits
c. simple circuits
d. all of the above
Use Figure 2 for Question 18.
Figure 2
_____ 18. If a light bulb is added to the circuit shown in Figure 2 in the same manner
a. the resistance in the circuit will increase.
b. the resistance in the circuit will decrease.
c. the resistance in the circuit will not change.
d. the circuit will short out.
_____ 19. Hans Oersted discovered that
a. current moving through a wire produces a magnetic field.
b. bar magnets have weaker magnetic fields than horseshoe magnets.
c. a negative magnetic pole will attract a positive magnetic pole.
d. none of the above.
_____ 20. Which of the following factors influences the strength of an electromagnet?
a. the number of coils
b. the amount of current
c. the iron core
d. all of the above
_____ 21. Which of the following statements best describes magnetic field strength in
electromagnets?
a. As the number of coils increases, the strength decreases.
b. As the number of coils increases, the strength increases.
c. As the current increases, the strength decreases.
d. As the core size increases, the strength decreases.
_____ 22. In an electric fan the energy transformation that occurs is
a. mechanical to electrical.
b. electrical to potential.
c. chemical to mechanical.
d. electrical to mechanical.
_____ 23. In a cell the energy transformation that occurs is
a. potential chemical to kinetic light.
b. potential chemical to kinetic electrical.
c. kinetic chemical to potential light.
d. kinetic chemical to potential electrical .
Use Figure 3 below to answer question 24
Figure 3
S
S
_____ 24. In the diagram above, how do the magnetic fields of the two magnets affect each other?
a. The magnetic fields attract each other.
b. The magnetic fields do not affect each other.
c. The magnetic fields repel each other.
d. The magnetic fields cancel each other out.
BONUS:
Suppose that you sprinkled iron filings around the magnets above. Draw the lines of
force that would be formed showing the interaction of the magnetic fields.
Use Figure 4 for Question 25.
Figure 4
=
Magnet A
Domain
alignment
direction
Magnet B
_____ 25. Magnet A and Magnet B are made of the same material and are the same size. Which of the
following statements best describes their magnetic fields?
a. Magnet B is stronger because all of the domains are facing in different directions.
b. Magnet B is weaker because the proton charge of the domains is not aligned.
c. Magnet A is stronger because all of the domains are facing in the same direction.
d. Magnet A is weaker because the electron charge of the domains is aligned.
PROBLEM QUESTION: What is the effect of the amount of sleep a sixth grade student gets on
his/her test performance?
_____ 26. Identify the independent variable in the investigation based on the problem question
above.
a. the amount of sleep a sixth grade student gets
b. the test performance of the sixth grade student
c. the total number of sixth grade students that take the test
d. the time that a sixth grade student goes to bed before a test