Gibilisco - Basic Physical Concepts

20 Questions

Settings
Please wait...
Gibilisco - Basic Physical Concepts


Questions and Answers
  • 1. 
    The atomic number of an element is determined by
    • A. 

      The number of neutrons.

    • B. 

      The number of protons.

    • C. 

      The number of neutrons plus the number of protons.

    • D. 

      The number of electrons.

  • 2. 
    The atomic weight of an element is approximately determined by
    • A. 

      The number of neutrons.

    • B. 

      The number of protons.

    • C. 

      The number of neutrons plus the number of protons.

    • D. 

      The number of electrons.

  • 3. 
    Suppose there is an atom of oxygen, containing eight protons and eight neutrons in thenucleus, and two neutrons are added to the nucleus. What is the resulting atomic weight?
    • A. 

      8

    • B. 

      10

    • C. 

      16

    • D. 

      18

  • 4. 
    An ion
    • A. 

      Is electrically neutral.

    • B. 

      Has positive electric charge.

    • C. 

      Has negative electric charge.

    • D. 

      Can have either a positive or negative charge.

  • 5. 
    An isotope
    • A. 

      Is electrically neutral.

    • B. 

      Has positive electric charge.

    • C. 

      Has negative electric charge.

    • D. 

      Can have either a positive or negative charge.

  • 6. 
    A molecule
    • A. 

      Can consist of a single atom of an element.

    • B. 

      Always contains two or more elements.

    • C. 

      Always has two or more atoms.

    • D. 

      Is always electrically charged.

  • 7. 
    In a compound,
    • A. 

      There can be a single atom of an element.

    • B. 

      There must always be two or more elements.

    • C. 

      The atoms are mixed in with each other but not joined.

    • D. 

      There is always a shortage of electrons.

  • 8. 
    An electrical insulator can be made a conductor
    • A. 

      By heating it.

    • B. 

      By cooling it.

    • C. 

      By ionizing it.

    • D. 

      By oxidizing it.

  • 9. 
    Of the following substances, the worst conductor is
    • A. 

      Air.

    • B. 

      Copper.

    • C. 

      Iron.

    • D. 

      Salt water.

  • 10. 
    Of the following substances, the best conductor is
    • A. 

      Air.

    • B. 

      Copper.

    • C. 

      Iron.

    • D. 

      Salt water.

  • 11. 
    • A. 

      Is like a flow of electrons in the same direction.

    • B. 

      Is possible only if the current is high enough.

    • C. 

      Results in a certain amount of electric current.

    • D. 

      Causes the material to stop conducting.

  • 12. 
    If a material has low resistance, then
    • A. 

      It is a good conductor.

    • B. 

      It is a poor conductor.

    • C. 

      The current flows mainly in the form of holes.

    • D. 

      Current can flow only in one direction.

  • 13. 
    A coulomb
    • A. 

      Represents a current of 1 ampere.

    • B. 

      Flows through a 100-watt light bulb.

    • C. 

      Is equivalent to 1 ampere per second.

    • D. 

      Is an extremely large number of charge carriers.

  • 14. 
    A stroke of lightning
    • A. 

      Is caused by a movement of holes in an insulator.

    • B. 

      Has a very low current.

    • C. 

      Is a discharge of static electricity.

    • D. 

      Builds up between clouds.

  • 15. 
    The volt is the standard unit of
    • A. 

      Current.

    • B. 

      Charge.

    • C. 

      Electromotive force.

    • D. 

      Resistance.

  • 16. 
    If an EMF of 1 volt is placed across a resistance of 2 ohms, then the current is
    • A. 

      Half an ampere.

    • B. 

      1 ampere.

    • C. 

      2 amperes.

    • D. 

      Impossible to determine.

  • 17. 
    A backward-working electric motor, in which mechanical rotation is converted to electricity,is best described as
    • A. 

      An inefficient, energy-wasting device.

    • B. 

      A motor with the voltage connected the wrong way.

    • C. 

      An electric generator.

    • D. 

      A magnetic field.

  • 18. 
    In a battery, chemical energy can sometimes be replenished by
    • A. 

      Connecting it to a light bulb.

    • B. 

      Charging it.

    • C. 

      Discharging it.

    • D. 

      No means known; when a battery is dead, you must throw it away.

  • 19. 
    A fluctuating magnetic field
    • A. 

      Produces an electric current in an insulator.

    • B. 

      Magnetizes the earth.

    • C. 

      Produces a fluctuating electric field.

    • D. 

      Results from a steady electric current.

  • 20. 
    Visible light is converted into electricity
    • A. 

      In a dry cell.

    • B. 

      In a wet cell.

    • C. 

      In an incandescent bulb.

    • D. 

      In a photovoltaic cell.