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

  2.   Identify the precision unit of the graduated cylinder below.
   
    A. 0.5 mL B. 1 mL
    C. 2 mL D. 5 mL
    Hint

  3.   Identify the precision unit of the clock below.
   
    A. 3 h B. 1 h
    C. 1 min D. 30 min
    Hint

  4.   Identify the length of the pencil using significant digits.
   
    A. 18.15 cm B. 18.2 cm
    C. 18.05 cm D. 18 cm
    Hint

  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. 2 B. 15
    C. 8 D. 6
    Hint



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