Electricity Test

50 Questions

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Electricity Test

Unit test on electricity.


Questions and Answers
  • 1. 
    In a wave, the number of oscillations per second is its
    • A. 

      Voltage

    • B. 

      Spectrum

    • C. 

      Wavelength

    • D. 

      Frequency

  • 2. 
    The distance covered by one complete wave (or one complete cycle) is called
    • A. 

      Voltage

    • B. 

      Capacitance

    • C. 

      Wavelength

    • D. 

      Frequency

  • 3. 
    Frequency is
    • A. 

      The number of oscillations per second

    • B. 

      Measured in Hertz

    • C. 

      An indicator of how rapidly current is changing

    • D. 

      All of the above

    • E. 

      None of the above

  • 4. 
     The unit for #times/sec is
    • A. 

      Hertz

    • B. 

      Amps

    • C. 

      Volts

    • D. 

      Ohms

  • 5. 
    A transverse wave is a wave that travels
    • A. 

      Parallel to another wave

    • B. 

      Perpendicularly to another wave

    • C. 

      Faster than another wave

    • D. 

      Slower than another wave

  • 6. 
    Current flowing in only one direction is
    • A. 

      Unpredictable Current (UC)

    • B. 

      Alternating Current (AC)

    • C. 

      Direct Current (DC)

    • D. 

      Detectable Current (DC)

  • 7. 
    In the electromagnetic spectrum, which waveform has the shortest wavelength?
    • A. 

      Gamma Rays

    • B. 

      X-Rays

    • C. 

      Ultraviolet Light

    • D. 

      Infrared Light

    • E. 

      Radio Waves

  • 8. 
    In the electromagnetic spectrum, which waveform has the longest wavelength?
    • A. 

      Gamma Rays

    • B. 

      X-Rays

    • C. 

      Visible Light

    • D. 

      Microwaves

    • E. 

      Radio Waves

  • 9. 
    True or False:  All types of electromagnetic waves have the same frequency.
    • A. 

      True

    • B. 

      False

  • 10. 
    True or False:  In electromagnetic waves, an electric wave moves perpendicularly to a magnetic wave.
    • A. 

      True

    • B. 

      False

  • 11. 
    In the electromagnetic spectrum, put these waveforms in order from most rapid (highest frequency) to slowest (lowest frequency):  radio waves, infrared, microwave, gamma rays, x-rays, ultraviolet light, visible light.
    • A. 

      Radio, infrared, x-ray, gamma, ultraviolet, visible light, microwave

    • B. 

      Gamma, radio, ultraviolet, visible light, microwave, x-ray, infrared

    • C. 

      Gamma, x-ray, ultraviolet, visible light, infrared, microwave, radio

    • D. 

      Radio, microwave, infrared, visible light, ultraviolet, x-ray, gamma

    • E. 

      None of these -- they all have the same frequency

  • 12. 
    True or False.  Humans can see gamma rays with their eyeballs.
    • A. 

      True

    • B. 

      False

  • 13. 
    Oscillating current is called
    • A. 

      Direct Current (DC)

    • B. 

      Alternating Current (AC)

    • C. 

      Annoying Current (AC)

    • D. 

      Disorganized Current (DC

  • 14. 
    • A. 

      AC

    • B. 

      DC

    • C. 

      60 Hz

    • D. 

      A and C

    • E. 

      B and C

  • 15. 
    True or False.  A capacitor is a circuit component that consists of two parallel plates of charge.
    • A. 

      True

    • B. 

      False

  • 16. 
    When is this equation used?REQ = R1 + R2
    • A. 

      When two resistors are connected in parallel

    • B. 

      When two resistors are connected in series

    • C. 

      When two batteries are connected in parallel

    • D. 

      When two capacitors are connected in series

  • 17. 
    When is this equation used?1/REQ = 1/R1 + 1/R2
    • A. 

      When two resistors are connected in parallel

    • B. 

      When two resistors are connected in series

    • C. 

      When two batteries are connected in parallel

    • D. 

      When two capacitors are connected in series

  • 18. 
    In this circuit diagram, where will most of the current flow and why?
    • A. 

      It will flow through the 2 Ohm resistor because it follows the path of least resistance.

    • B. 

      It will flow through the 10 Ohm resistor because it follows the first path it reaches.

    • C. 

      It will flow through the 50 Ohm reisitor because it follows the path of greatest resistance.

  • 19. 
    Find REQ for this circuit.
    • A. 

      50/3 Ohms

    • B. 

      3/50 Ohms

    • C. 

      120 Ohms

    • D. 

      1/120 Ohms

  • 20. 
    Find REQ for this circuit.
    • A. 

      15/26 KΩ

    • B. 

      6.5 KΩ

    • C. 

      26/15 KΩ

    • D. 

      7.5 KΩ

  • 21. 
    • A. 

      4,333 Amps

    • B. 

      4.333 Amps

    • C. 

      230 Amps

    • D. 

      0.23 Amps

  • 22. 
    What are these?
    • A. 

      Resistors

    • B. 

      Capacitors

    • C. 

      Batteries

    • D. 

      Lightbulbs

    • E. 

      Transformers

  • 23. 
    What do the stripes indicate?
    • A. 

      Amount of voltage

    • B. 

      Amount of current

    • C. 

      Amount of resistance

    • D. 

      Amount of energy

    • E. 

      Amount of power

  • 24. 
    What is the unit for voltage?
    • A. 

      Ampere

    • B. 

      Joule

    • C. 

      Volt

    • D. 

      Hertz

    • E. 

      Ohm

  • 25. 
    What is the unit for current?
    • A. 

      Ampere

    • B. 

      Joule

    • C. 

      Volt

    • D. 

      Hertz

    • E. 

      Ohm

  • 26. 
    What is the unit for resistance?
    • A. 

      Ampere

    • B. 

      Joule

    • C. 

      Volt

    • D. 

      Hertz

    • E. 

      Ohm

  • 27. 
    Give the equation for Ohm's Law.
    • A. 

      PE = mgh

    • B. 

      R = IV

    • C. 

      I = VR

    • D. 

      V = IR

    • E. 

      None of these

  • 28. 
    What is the unit for energy?
    • A. 

      Ampere

    • B. 

      Joule

    • C. 

      Hertz

    • D. 

      Volts

    • E. 

      Ohms

  • 29. 
    • A. 

      Radiant energy of a lightbulb in a circuit

    • B. 

      Kinectic energy of a motor in a circuit

    • C. 

      Potential energy stored in a battery

    • D. 

      The flow of electrons

  • 30. 
    What is current?
    • A. 

      The newness of a battery or resistor

    • B. 

      Flow of charge, usually in the form of electrons

    • C. 

      Something that blocks or slows the flow of electrons

    • D. 

      The potential energy stored in a battery

  • 31. 
    In this graph, what does the slope reprent?  (Hint:  think about Ohm's Law)
    • A. 

      Constant voltage

    • B. 

      Constant current

    • C. 

      Constant energy

    • D. 

      Constant resistance

  • 32. 
    A typical size-AA battery holds how many volts?
    • A. 

      15 V

    • B. 

      300 V

    • C. 

      1.5 V

    • D. 

      3 V

  • 33. 
    The resistance of a hotplate is 48 Ω .  How much current does the plate carry when connected to a 120-V source?
    • A. 

      120 A

    • B. 

      0.4 A

    • C. 

      5760 A

    • D. 

      2.5 A

  • 34. 
    A certain steam iron carries a current of 6.4 A when connected to a 120 V source.  What is the resistance of the steam iron?
    • A. 

      1.875 Ω

    • B. 

      0.05 Ω

    • C. 

      768 Ω

    • D. 

      18.75 Ω

  • 35. 
    What if a bird sat on a power line that was very close to the ground, placing one foot on the wire and one foot on the ground?
    • A. 

      No current would flow through the bird, so nothing would happen

    • B. 

      The bird would experience a voltage difference between the wire and the ground and would get fried

    • C. 

      The bird's feet are insulated, so it doesn't matter what it touches

  • 36. 
    • A. 

      Because birds have minimal resistance compared to household electronics, so current is diverted to the houses instead

    • B. 

      Because the wire is in the air and air has infinite resistance so no current flows through the wire

    • C. 

      Because birds' feet are insulated so current is not conducted through them

    • D. 

      Because both feet are on the same voltage line, so there is no potential difference, so current does not flow through the bird

  • 37. 
    • A. 

      Spiderman's, in series

    • B. 

      Batman's, in parallel

    • C. 

      Both have the same REQ

  • 38. 
    • A. 

      To store electrical energy

    • B. 

      To make current switch back and forth rapidly

    • C. 

      To control how much current flows through a particular part of the circuit so other components work properly

    • D. 

      Resistors don't really exist, they are just a concept

  • 39. 
    True or False.  In a circuit, we describe current as flowing from + to -, even though in reality electrons are moving from - to +, which results in the same effect overall.
    • A. 

      True.

    • B. 

      False.

  • 40. 
    True or False.  Circuit diagrams are schematic maps drawn to represent the connections between electrical components like batteries, resistors, light bulbs, etc.
    • A. 

      True.

    • B. 

      False.

  • 41. 
    Two identical resistors are connected.  Their REQ is less than the resistance of either resistor on its own.  Most likely, the resistors are connected how?
    • A. 

      In series

    • B. 

      In parallel

    • C. 

      They are most likely not connected at all

  • 42. 
    Two identical resistors are connected.  Their REQ is exactly double the resistance of each on its own.  Most likely, the resistors are connected how?
    • A. 

      In series

    • B. 

      In parallel

    • C. 

      Most likely, they are not connected to one another

  • 43. 
    Two identical batteries are connected.  Their total voltage is exactly twice as much as either battery on its own.  Most likely, they are connected how?
    • A. 

      In series

    • B. 

      In parallel

    • C. 

      Most likely they are not connected to one another

  • 44. 
    Calculate the REQ for the entire circuit. ( Hint:  First, calculate the REQ for the resistors in series in each branch.  Then, calculate the REQ of those REQs, which will be in parallel.)
    • A. 

      300/61 Ohms

    • B. 

      110 Ohms

    • C. 

      240/11 Ohms

    • D. 

      305/12 Ohms

  • 45. 
    True or false.  Metals make good insulators because they don't share electrons easily.
    • A. 

      True

    • B. 

      False

  • 46. 
    What are ions?
    • A. 

      Electrons

    • B. 

      Atoms that are positively or negatively charged

    • C. 

      Neutrons

    • D. 

      An unexpected outcome in literature

  • 47. 
    • A. 

      All arrows radiating out from the center

    • B. 

      Some arrows pointing out and some pointing in from the center

    • C. 

      All arrows pointing in towards the center

    • D. 

      Arrows lining up on horizontal axis and approaching the center

  • 48. 
    True or false.  Opposite charges attract.
    • A. 

      True.

    • B. 

      False.

  • 49. 
    What factors contribute to a material's resistance?
    • A. 

      The ph, the voltage, and its frequency

    • B. 

      What the material is, the flammability, and the current

    • C. 

      What the material is, the age, and the amplitude

    • D. 

      What the material is, the length, and the thickness

  • 50. 
    Alex walks across the carpet, reaching towards a doorknob, and receives a shock.  Why?
    • A. 

      Alex and the door knob were both postively charged. When Alex touched the door knob, he felt a shock because like charges attract.

    • B. 

      The doorknob was too close to the doorbell, and a wire must have been touching it. Alex has no charge because he is a person.

    • C. 

      Alex acquired charge by walking across the carpet, probably stripping electrons off the carpet. These charges jumped to the doorknob which probably had the opposite charge of Alex. The shock was the current of these moving charges from Alex to the doorknob.

    • D. 

      Alex and the door knob are both insulators. It is impossible for Alex to feel a shock.