Understanding Uncertainty in Measurements

What is the main characteristic of absolute uncertainty?

• It is expressed in terms of significant figures.

• It is independent of the original measurement.

• It is expressed as a percentage of the original number.

• It is always larger than fractional uncertainty.

How is absolute uncertainty visually represented on a number line?

• As a variable range depending on the measurement.

• As a fraction of the measurement value.

• As a fixed range around the measurement value.

• As a percentage increase from the measurement.

What is the relationship between fractional and percent uncertainty?

• They are unrelated and cannot be converted.

• Fractional uncertainty is always larger than percent uncertainty.

• Percent uncertainty is fractional uncertainty multiplied by 100.

• Fractional uncertainty is percent uncertainty divided by 10.

Why are fractional and percent uncertainties considered relative?

• They are always smaller than absolute uncertainty.

• They depend on the size of the original measurement.

• They are expressed in different units than absolute uncertainty.

• They are always expressed as whole numbers.

Where is the unit of measurement placed in absolute uncertainty?

• Before the measurement value.

• After both the measurement and uncertainty values.

• Next to the measurement value only.

• Next to the uncertainty value only.

What rule applies to decimal places in absolute uncertainty?

• The uncertainty should have more decimal places than the measurement.

• The measurement should have fewer decimal places than the uncertainty.

• The measurement and uncertainty should match in decimal places.

• Decimal places are not important in absolute uncertainty.

How do you convert an absolute uncertainty to a fractional uncertainty?

• Subtract the absolute uncertainty from the original number.

• Add the absolute uncertainty to the original number.

• Divide the absolute uncertainty by the original number.

• Multiply the absolute uncertainty by the original number.

What is the first step in converting an absolute uncertainty to a percent uncertainty?

• Multiply the absolute uncertainty by 100.

• Divide the absolute uncertainty by the original number.

• Add the absolute uncertainty to the original number.

• Subtract the absolute uncertainty from the original number.

What is the policy for rounding absolute uncertainties?

• Round to two significant figures.

• Round to the same decimal place as the original number.

• Do not round absolute uncertainties.

• Round to the nearest whole number.

How do you convert a percent uncertainty to a fractional uncertainty?

• Multiply by 100.

• Subtract 100 from the percent value.

• Add 100 to the percent value.

• Divide by 100.