Sig Figs & Calculation Practice

What is the significance of the estimated digit in measurements?

• It is always zero

• It is the last digit in the measurement

• It is the first digit in the measurement

• It is not important

What is the purpose of including an estimated digit in measurements?

• To ensure the measurement is exact

• To account for the precision of the measuring device

• To make the measurement easier to read

• To reduce the number of digits in the measurement

Which of the following is considered to be an exact quantity?

• 12 in = 1 ft

• 12.5 in = 1 ft

• 11.9 in = 1 ft

• 13 in = 1 ft

Which of the following is NOT an example of an exact number?

• 25 people

• 12 in = 1 ft

• 100 cm = 1 m

• 25.5 people

Which of the following is an example of a defined quantity?

• 25.5 people

• 12 in = 1 ft

• 25 people

• 100.5 cm = 1 m

What is the rule for leading zeros in terms of significant figures?

• They are always significant

• They are never significant

• They are significant only if they are after the decimal point

• They are significant only if they are between numbers

Which of the following numbers has more than one significant figure?

• 0.003

• 0.04

• 0.0040

• 0.004

Which type of zeros are always significant?

• Trailing zeros

• Leading zeros

• Captive zeros

• Decimal zeros

How many significant figures does the number 20005 have?

• 3

• 4

• 5

• 6

Which of the following numbers has 5 significant figures?

• 0.000482

• 1.6503 x 10^2

• 56.149

• 3.92 x 10^5