Read the length of the metal bar with the correct number of significant figures.
A) 20 cm
B) 15 cm
C) 15.0 cm
D) 15.00 cm
E) 15.000 cm

Question

Read the length of the metal bar with the correct number of significant figures. 
A) 20 cm 
B) 15 cm 
C) 15.0 cm 
D) 15.00 cm 
E) 15.000 cm

Quizplus · Accepted Answer

Since the given number has no decimal places, we have to assume that it is a whole number. Therefore, the answer should not have any decimal places. However, there are no leading zeroes, so we cannot choose choices A or B. The number has 2 significant figures (based on the non-zero digits), so we can choose choice D, which has 4 significant figures, but only 2 after the decimal. Therefore, the answer is 15.00 cm.

Read the Length of the Metal Bar with the Correct