1.   Identify the precision unit of the ruler below.
    A. in. B. 4 in.
    C. in. D. in.

  2.   Identify the precision unit of the thermometer below.
    A. 5°F B. 1°F
    C. 10°F D. 0.5°F

  3.   Identify the weight shown on the scale using significant digits.
    A. 8 kg B. 8.65 kg
    C. 8.7 kg D. 8.6 kg

  4.   Identify the measure shown on the graduated cylinder using significant digits.
    A. 20 mL B. 16.5 mL
    C. 16.53 mL D. 16 mL

  5.   The temperature at the core of the sun is estimated to be over 15,000,000 degrees Celsius. How many significant digits are in this measurement?
    A. 8 B. 6
    C. 15 D. 2

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