Mec 280 Midterm 2

80 Questions | Total Attempts: 244

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Midterm Quizzes & Trivia

Questions and Answers
  • 1. 
    How many miles above the earth's surface is the ozone layer?
    • A. 

      12 to 25 miles

    • B. 

      18 to 30 miles

    • C. 

      25 to 40 miles

    • D. 

      30 to 50 miles

  • 2. 
    Which atom destroys the ozone most?
    • A. 

      Carbon

    • B. 

      Chlorine

    • C. 

      Copper

    • D. 

      Calcium

  • 3. 
    Which atom destroys the least ozone?
    • A. 

      Bromine

    • B. 

      Chlorine

    • C. 

      Nitric Oxide

    • D. 

      Hydrogen

  • 4. 
    The ozone layer was formed about
    • A. 

      10 billion years ago

    • B. 

      1 billion years ago

    • C. 

      100 million years ago

    • D. 

      10 million years ago

  • 5. 
    CFC's were devoloped in the early
    • A. 

      1920's

    • B. 

      1930's

    • C. 

      1940's

    • D. 

      2000's

  • 6. 
    What does Y represent in the chemical reaction below? O3 + Y --> O2 + O
    • A. 

      UVA

    • B. 

      UVB

    • C. 

      UVC

    • D. 

      None of the above

  • 7. 
    Which of the following in not a halogen atom?
    • A. 

      Flourine

    • B. 

      Chlorine

    • C. 

      Iodine

    • D. 

      Hydrogen

  • 8. 
    CFC's were used in
    • A. 

      Plastics

    • B. 

      Foams

    • C. 

      Anti-oxidants

    • D. 

      All of the above

  • 9. 
    Which of the following in not a greenhouse gas?
    • A. 

      Carbon dioxide

    • B. 

      Methane

    • C. 

      Ozone

    • D. 

      Oxygen

  • 10. 
    A hole (50% reduction) in the Antarctic ozone layer was first observed in the
    • A. 

      1960's

    • B. 

      1970's

    • C. 

      1980' 1980's

    • D. 

      1990's

  • 11. 
    CFC's were used in
    • A. 

      Propellants

    • B. 

      Foams

    • C. 

      Refrigeration

    • D. 

      All of the above

  • 12. 
    Which of the following ultraviolet light mostly destroys the ozone
    • A. 

      UVC

    • B. 

      UVA

    • C. 

      UVB

    • D. 

      They are all equal

  • 13. 
    Which of these greenhouse gases has the highest percentage composition in the atmosphere
    • A. 

      Water Vapor

    • B. 

      Carbon dioxide

    • C. 

      Methane

    • D. 

      Ozone

  • 14. 
    60% of the CFC-12 will disappear from the atmosphere in about
    • A. 

      55 years

    • B. 

      116 years

    • C. 

      174 years

    • D. 

      210 years

  • 15. 
    60% of CDC-11 will disappear from the atmosphere in about
    • A. 

      55 years

    • B. 

      116 years

    • C. 

      173 years

    • D. 

      210 years

  • 16. 
    Which type of UV radiation is needed to produce vitamine D
    • A. 

      Uv A

    • B. 

      Uv B

    • C. 

      Uv C

  • 17. 
    The wavelength of a uv A radiation is
    • A. 

      150-250 nm

    • B. 

      280-320 nm

    • C. 

      400-700 nm

    • D. 

      800 - 1000m

  • 18. 
     Which type of uv radiation is responsible for the most DNA damage at the earth’s surface?
    • A. 

      Uv A

    • B. 

      Uv B

    • C. 

      Uv C

  • 19. 
    The wavelength of uv C radiation is
    • A. 

      280-320nm

    • B. 

      400-700nm

    • C. 

      800-1000nm

    • D. 

      250-290nm

  • 20. 
     Which UV radiation is mostly filtered by the atmosphere?
    • A. 

      Uv A

    • B. 

      Uv B

    • C. 

      Uv C

  • 21. 
    Which of the following on the electromagnetic spectrum has the lowest wavelength?
    • A. 

      Microwaves

    • B. 

      AM radio

    • C. 

      Gamma rays

    • D. 

      X rays

  • 22. 
    Which of the following on the spectrum has the highest wavelength?
    • A. 

      Microwaves

    • B. 

      Am radio

    • C. 

      Gamma waves

    • D. 

      X rays

  • 23. 
    Which color has the highest frequency on the electromagnetic spectrum?
    • A. 

      Red

    • B. 

      Blue

    • C. 

      Violet

    • D. 

      Green

  • 24. 
    The ___ is the unit of frequency
    • A. 

      Meter

    • B. 

      Hertz

    • C. 

      Second

    • D. 

      Watt

  • 25. 
    The __ is the unit of wavelength
    • A. 

      Meter

    • B. 

      Hertz

    • C. 

      Second

    • D. 

      Watt

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