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Physics Chapter 23

63 Questions
Physics Quizzes & Trivia

Physics Chapter 23

Questions and Answers
  • 1. 
    Electrons are made to flow in a wire when there is 
    • A. 

      An imbalance of charges in the wire

    • B. 

      More potential energy at one end of the wire than the other

    • C. 

      A potential difference across its ends

  • 2. 
    An ampere is a unit of electrical
    • A. 

      Pressure

    • B. 

      Current

    • C. 

      Resistance

    • D. 

      All of these

    • E. 

      None of these

  • 3. 
    A wire that carries an electric current
    • A. 

      Is electrically charged

    • B. 

      May be electrically charged

    • C. 

      Is never electrically charged

  • 4. 
    A coulomb of charge that passes through a 6-volt battery is given
    • A. 

      6 joules

    • B. 

      6 amperes

    • C. 

      6 ohms

    • D. 

      6 watts

    • E. 

      6 newtons

  • 5. 
    Which statement is correct?
    • A. 

      Charge flows in a circuit

    • B. 

      Voltage flows through a circuit

    • C. 

      Resistance is established across a circuit

    • D. 

      Current causes voltage

  • 6. 
    Electrons move in an electrical circuit
    • A. 

      By being bumped by other electrons

    • B. 

      By colliding with molecules

    • C. 

      By interacting with an established electric field

    • D. 

      Because the wires are so thin

    • E. 

      None of these

  • 7. 
    Heat a copper wire and its electric resistance
    • A. 

      Decreases

    • B. 

      Remains uncharged

    • C. 

      Increases

  • 8. 
    Stretch a copper wire so that it is thinner and the resistance between its ends
    • A. 

      Decreases

    • B. 

      Remains unchanged

    • C. 

      Increases

  • 9. 
    A wire carrying a current is normally charged
    • A. 

      Negatively

    • B. 

      Positively

    • C. 

      Not at all

  • 10. 
    In an ac circuit, the electric field
    • A. 

      Increases via the inverse square law

    • B. 

      Changes magnitude and direction with time

    • C. 

      Is everywhere the same

    • D. 

      Is non-existent

    • E. 

      None of these

  • 11. 
    The current through a 10-ohm resistor connected to a 120-V power supply is
    • A. 

      1 A

    • B. 

      10 A

    • C. 

      12 A

    • D. 

      120 A

    • E. 

      None of these

  • 12. 
    A 10-ohm resistor has a 5-A current in it. What is the voltage across the resistor?
    • A. 

      5 V

    • B. 

      10 V

    • C. 

      15 V

    • D. 

      20 V

    • E. 

      More than 20 V

  • 13. 
    When a 10-V battery is connected to a resistor, the current in the resistor is 2A. What is the resistor's value?
    • A. 

      2 ohms

    • B. 

      5 ohms

    • C. 

      10 ohms

    • D. 

      20 ohms

    • E. 

      More than 20 ohms

  • 14. 
    The source of electrons in an ordinary electrical circuit is
    • A. 

      A dry cell, wet cell or battery

    • B. 

      The back emf of motors

    • C. 

      The power station generator

    • D. 

      The electrical conductor itself

    • E. 

      None of these

  • 15. 
    The source of electrons lighting an incandescent as light bulb is
    • A. 

      The power company

    • B. 

      Electrical outlet

    • C. 

      Atoms in the light bulb filament

    • D. 

      The wire leading to the lamp

    • E. 

      The source voltage

  • 16. 
    A woman experiences an electrical shock. The electrons making the shock come from the
    • A. 

      Woman's body

    • B. 

      Ground

    • C. 

      Power plant

    • D. 

      Hairdryer

    • E. 

      Electric field in the air

  • 17. 
    In a common dc circuit, electrons move at speeds of
    • A. 

      A fraction of a centimeter per second

    • B. 

      Many centimeters per second

    • C. 

      The speed of a sound wave

    • D. 

      The speed of light

    • E. 

      None of these

  • 18. 
    When a light switch is turned on in a dc circuit, the average speed of electrons in the lamp is
    • A. 

      The speed of sound waves in metal

    • B. 

      The speed of light

    • C. 

      1000 cm/s

    • D. 

      Less than 1 cm/s

    • E. 

      Dependent on how quickly each electron bumps into the next electron

  • 19. 
    Alternating current is normally produced by a
    • A. 

      Battery

    • B. 

      Generator

    • C. 

      Both of these

    • D. 

      Neither of these

  • 20. 
    The electric power of a lamp that carries 2 A at 120 V is
    • A. 

      1/6 watts

    • B. 

      2 watts

    • C. 

      60 watts

    • D. 

      20 watts

    • E. 

      240 watts

  • 21. 
    When two lamps are connected in parallel to a battery, the electrical resistance that the battery senses is
    • A. 

      More than the resistance of either lamp

    • B. 

      Less than the resistance of either lamp

    • C. 

      None of these

  • 22. 
    When two lamps are connected in series to a battery, the electrical resistance that the battery senses is
    • A. 

      More than the resistance of either lamp

    • B. 

      Less than the resistance of either lap

    • C. 

      None of these

  • 23. 
    On some early automobiles both headlights went out when one bulb burned out. The headlights must have been connected in
    • A. 

      Parallel

    • B. 

      Perpendicular

    • C. 

      Series

    • D. 

      Haste

  • 24. 
    Modern automobile headlights are connected in
    • A. 

      Parallel

    • B. 

      Perpendicular

    • C. 

      Series

    • D. 

      None of these

  • 25. 
    There are electrons int he filament of the ac lamp in your bedroom. When you turn on the lamp and it glows, the glowing comes from 
    • A. 

      Different electrons; the ones that flow in the circuit to your lamp

    • B. 

      The same electrons

    • C. 

      The positive charges that flow in the filament

  • 26. 
    A 100-watt lamp glows brighter than a 25-Watt lamp. The electrical resistance of the 100-watt lamp must be
    • A. 

      Less

    • B. 

      Greater

    • C. 

      The same

  • 27. 
    In an electric circuit, the safety fuse is connected to the circuit in
    • A. 

      Series

    • B. 

      Parallel

  • 28. 
    When a pair of 1-ohm resistors are connected in series, their combined resistance is
    • A. 

      1 ohm, and when connected in parallel, 2 ohms

    • B. 

      2 ohms, and when in parallel 1 ohm

    • C. 

      1/2 ohm, and when in parallel, 2 ohms

    • D. 

      2 ohms, and when in parallel 1/2 ohm

    • E. 

      Non of these

  • 29. 
     a circuit breaker serves the same purpose as 
    • A. 

      A switch

    • B. 

      A fuse

    • C. 

      A capacitor

    • D. 

      A battery

    • E. 

      None of these

  • 30. 
    A capacitor is useful in
    • A. 

      Boosting the energy output of a circuit

    • B. 

      Increasing the current in a resistor

    • C. 

      Smoothing pulsed current

    • D. 

      Switching dc to ac in a circuit

    • E. 

      Increasing or decreasing voltage

  • 31. 
    An electrical diode is useful for
    • A. 

      Storing electrical energy

    • B. 

      Boosting voltage

    • C. 

      Limiting current

    • D. 

      Voltage modification

    • E. 

      Changing ac to dc

  • 32. 
    In the 110-volt circuit shown,
    • A. 

      110 coulombs of charge flow through the lamp every second

    • B. 

      110 joules of energy are converted to heat and light in the circuit every second

    • C. 

      110 joules of energy are given up by each coulomb of charge making up the current in the circuit

    • D. 

      110 joules of energy are shared among all the coulombs in the circuit at any instant

    • E. 

      None of the above

  • 33. 
    In the circuit of figure 23-A, energy is given to the moving charges by
    • A. 

      The bulb

    • B. 

      The wires

    • C. 

      A generator which is not shown

    • D. 

      Non of these

  • 34. 
    A capacitor is used to store
    • A. 

      Charge

    • B. 

      Energy

    • C. 

      Both

    • D. 

      Neither

  • 35. 
    The number of electrons delivered daily to an average American home by an average power utility in the mid 1980s was
    • A. 

      Zero

    • B. 

      110

    • C. 

      220

    • D. 

      Billion of billions

    • E. 

      None of these

  • 36. 
    Two lamps, one with a thick filament and one with a thin filament, are connected in series. The current is greater in the lamp with the
    • A. 

      Thick filament

    • B. 

      Thin filament

    • C. 

      The same in each lamp

  • 37. 
    Two lamps, one with a thick filament and one with a thin filament, are connected in parallel to a battery. the voltage is greatest across the lamp with the
    • A. 

      Thick filament

    • B. 

      Thin filament

    • C. 

      Both voltages are the same

  • 38. 
    Two lamps, one with thick filament and one with a thin filament of the same material, are connected in parallel to a battery. the current is larger in the lamp with the
    • A. 

      Thick filament

    • B. 

      Thin filament

    • C. 

      Current is the same in both

  • 39. 
    Two lamps, one with a thick filament and one with a thin filament of the same material, are connected in series to a battery. the voltage is greater across the lamp with the
    • A. 

      Thick filament

    • B. 

      Thin filament

    • C. 

      Voltage is the same for both

  • 40. 
    As more lamps are put into a series circuit, the overall current in the power source
    • A. 

      Increases

    • B. 

      Decreases

    • C. 

      Stays the same

  • 41. 
    As more lamps are put into a parallel circuit, the overall current in the power source
    • A. 

      Increases

    • B. 

      Decreases

    • C. 

      Stays the same

  • 42. 
    A circuit is powered with a battery. charge flows
    • A. 

      Out of the battery and into the circuit

    • B. 

      From the negative battery terminal to the positive terminal

    • C. 

      After a couple seconds passes

    • D. 

      Through both the battery and the rest of the circuit

    • E. 

      None of these

  • 43. 
    When we say an appliance "uses up electricity," we really are saying that 
    • A. 

      Current disappears

    • B. 

      Electric charges are dissipated

    • C. 

      The main power supply voltage is lowered

    • D. 

      Electrons are taken out of the circuit and put somewhere else

    • E. 

      Electron kinetic energy is changed into heat

  • 44. 
    Compared to the resistance of two resistors connected in series, the same two resistors connected in parallel have
    • A. 

      More resistance

    • B. 

      Less resistance

    • C. 

      The same resistance

  • 45. 
    If you plug an electric toaster rated at 110 V into a 220-V outlet, the current in the toaster wil be about
    • A. 

      Half what it should be

    • B. 

      The same as if it were plugged in 110 V

    • C. 

      More than twice what it should be

    • D. 

      Twice what it should be

  • 46. 
    A 60-watt light bulb is connected to a 120-volt plug. what is the current in the light bulb?
    • A. 

      0.25 A

    • B. 

      0.5 A

    • C. 

      2 A

    • D. 

      4 A

    • E. 

      More than 4 A

  • 47. 
    What is the power rating of a light bulb if 0.8 A flow through it when it is connected to a 120-volt outlet?
    • A. 

      12 W

    • B. 

      15 W

    • C. 

      60 W

    • D. 

      96 W

    • E. 

      120 W

  • 48. 
    The headlights, radio, and defroster fan in an automobile are connected in
    • A. 

      Series

    • B. 

      Parallel

  • 49. 
    A 4-ohm resistor is connected in parallel with a 6-ohm resistor. this combination produces an equivalent resistance of 
    • A. 

      2.4 ohms

    • B. 

      4 ohms

    • C. 

      5 ohms

    • D. 

      5.5 ohms

    • E. 

      10 ohms

  • 50. 
    The power dissipated in a 4-ohm resistor carrying 3 A is 
    • A. 

      7 W

    • B. 

      18 W

    • C. 

      36 W

    • D. 

      48 W

    • E. 

      Not enough information to say

  • 51. 
    Which is more dangerous, touching a faulty 110-volt light fixture, or a van de graaff generator charged to 100,00 volts?
    • A. 

      Touching the light fixture

    • B. 

      Touching the generator

    • C. 

      Touching both are about equally dangerous

  • 52. 
    A 60- W light bulb and a 100-W light bulb are each rated at 120 V. which light bulb has a larger resistance?
    • A. 

      The 60- W bulb

    • B. 

      The 100- W bulb

    • C. 

      Both have the same resistance

  • 53. 
    A 60 W light bulb and a 100- W light bulb are each connected to a 120 V outlet. Which light bulb has more current in it?
    • A. 

      The 60- W bulb

    • B. 

      The 100- W bulb

    • C. 

      Both have the same current

  • 54. 
    Compared to the filament thickness of a 60-W light bulb, the filament of a 100-W light bulb will be
    • A. 

      Thinner

    • B. 

      Thicker

    • C. 

      The same

  • 55. 
    Compared to a single lamp connected to a battery, two identical lamps connected in series to the same batter will carry
    • A. 

      More current

    • B. 

      Less current

    • C. 

      The same current

  • 56. 
    Compared to a single lamp connected to a battery, two lamps connected in parallel to the same battery will carry
    • A. 

      More current

    • B. 

      Less current

    • C. 

      The same current

  • 57. 
    • A. 

      2

    • B. 

      3

    • C. 

      4

    • D. 

      5

    • E. 

      More than 5

  • 58. 
    A heater uses 20 A when used in a 110-V line. If electric power costs 10 cents per kilowatt hour, the cost of running the heater for 10 hours is
    • A. 

      $0.22

    • B. 

      $0.55

    • C. 

      $2.20

    • D. 

      $5.50

    • E. 

      None of these

  • 59. 
    The current through two identical light bulbs connected in series is 0.25 A. the voltage across both bulbs is 110 V. the resistance of a single light bulb is
    • A. 

      22 ohms

    • B. 

      44 ohms

    • C. 

      220 ohms

    • D. 

      440 ohms

    • E. 

      None of these

  • 60. 
    A power line with a resistance of 2 ohms has a current of 80 A in it. the power dissipated in the line is
    • A. 

      40 W

    • B. 

      160 W

    • C. 

      320 W

    • D. 

      12800 W

    • E. 

      None of these

  • 61. 
    What is the resistance of a 120-W incandescent lamp connected to a 120-V power supply?
    • A. 

      1 ohm

    • B. 

      60 ohms

    • C. 

      100 ohms

    • D. 

      144 ohms

    • E. 

      None of these

  • 62. 
    Compared to the amount of electric current in the filament of a lamp, the amount of current in the connecting wire is
    • A. 

      Definitely less

    • B. 

      Often less

    • C. 

      Actually more

    • D. 

      The same

    • E. 

      Incredibly all of these

  • 63. 
    Connect a pair of lamps in series and you draw current from the connected battery. connect the same lamps in parallel and you draw
    • A. 

      The same current

    • B. 

      More current

    • C. 

      Less current

    • D. 

      Sometimes more, sometimes less