Chapter 14: Gases And Plasmas

10 Questions | Total Attempts: 523

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Chapter 14: Gases And Plasmas


Questions and Answers
  • 1. 
    The energy source responsible for the motion of molecules that make up the atmosphere is
    • A. 

      Their own natural kinetic energy.

    • B. 

      The pressure caused by the weight of air.

    • C. 

      Atmospheric tides.

    • D. 

      Solar power.

  • 2. 
    A plasma differs from a gas in that
    • A. 

      A plasma differs from a gas in that

    • B. 

      It is hotter than a gas.

    • C. 

      It is electrically conducting.

    • D. 

      Its atoms are boosted to higher atomic numbers.

    • E. 

      All of these

  • 3. 
    Atmospheric molecules do not fly off into outer space because of
    • A. 

      Their relatively high speeds.

    • B. 

      Their relatively low densities.

    • C. 

      Earth gravitation.

    • D. 

      Cohesive forces.

  • 4. 
    About what percentage of the molecules that make up the atmosphere are below an aircraft that flies at an altitude of 6 kilometers?
    • A. 

      20%

    • B. 

      30%

    • C. 

      40%

    • D. 

      50%

    • E. 

      More than 50%

  • 5. 
    Atmospheric pressure is caused by the
    • A. 

      Density of the atmosphere.

    • B. 

      Weight of the atmosphere.

    • C. 

      Temperature of the atmosphere.

    • D. 

      Effect of the sun's energy on the atmosphere.

  • 6. 
    What is the approximate mass of a 1-square-centimeter column of air that extends from sea level to the top of the atmosphere?
    • A. 

      1 gram

    • B. 

      1 kilogram

    • C. 

      10 kilograms

    • D. 

      100 kilograms

  • 7. 
    The weight of a 1-square-meter column of air that extends from sea level to the top of the atmosphere is
    • A. 

      101 N.

    • B. 

      10,100 N.

    • C. 

      101,000 N.

    • D. 

      101,000,000 N.

  • 8. 
    A balloon is buoyed up with a force equal to the
    • A. 

      Weight of air it displaces.

    • B. 

      Density of surrounding air.

    • C. 

      Atmospheric pressure.

    • D. 

      Weight of the balloon and contents.

    • E. 

      All of these

  • 9. 
    As a helium-filled balloon rises in the air, it becomes
    • A. 

      Bigger.

    • B. 

      More dense.

    • C. 

      Heavier.

    • D. 

      All of these

    • E. 

      None of these

  • 10. 
    A bubble of air released from the bottom of a lake
    • A. 

      Rises to the top at constant volume.

    • B. 

      Becomes smaller as it rises.

    • C. 

      Becomes larger as it rises.

    • D. 

      Alternately expands and contracts as it rises.

    • E. 

      None of these

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