1.   Identify the precision unit of the scale below.
    A. 1 oz B. 0.25 oz
    C. 0.3 oz D. 0.5 oz

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

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

  4.   Identify the measure shown on the graduated cylinder using significant digits.
    A. 16.5 mL B. 20 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. 2 B. 15
    C. 8 D. 6

The McGraw-Hill Companies