Chapter 2: Lesson 4

The estimated digit in the measurement 65,430 seconds is A. the zero B. the three C. the four D. no correct response

B. the three

How many significant figures are present in the measurement 0.0330? A. two B. three C. four D. no correct response

B. three

How many significant figures are present in the measurement 32.00? A. two B. three C. four D. no correct response

C. four

The uncertainty in the measurement 56.00 seconds is plus/minus what value? A. one B. one-tenth C. one-hundredth D. no correct response

C. one-hundredth

To what decimal position should a measurement be recorded if the smallest markings on the measurement scale are tenths of a millimeter? A. to the closest millimeter B. to tenths of a millimeter C. to hundredths of a millimeter D. no correct response

C. to hundredths of a millimeter

Which of the following statements about the "significance" of zeros in recorded measurements is incorrect? A. leading zeros are never significant B. confined zeros are always significant C. trailing zeros are never significant D. no correct response

C. trailing zeros are never significant

For each of the following measurements, give the number of significant figures present and the uncertainty associated with the measurement. 5623.00

Six significant figures are present because trailing zeros are significant when a deci- mal point is present. The uncertainty is in the hundredths place (±0.01), the loca- tion of the last significant digit.

For each of the following measurements, give the number of significant figures present and the uncertainty associated with the measurement. 97,200

Three significant figures are present because the trailing zeros are not significant (no explicit decimal point is shown). The uncertainty is in the hundreds place (±100)

For each of the following measurements, give the number of significant figures present and the uncertainty associated with the measurement. 637

Three significant figures are present, and the uncertainty is in the ones place (±1).

For each of the following measurements, give the number of significant figures present and the uncertainty associated with the measurement. 0.0031

Two significant figures are present because leading zeros are never significant. The uncertainty is in the ten-thousandths place (±0.0001), the location of the last significant digit.