Errors in measurement

Decide the number of significant figures: 4091.00

• 3

• 4

• 5

• 6

A measurement result is considered ________ if it is judged to be close to the true value. It is influenced by random and systematic errors.

• Precise

• Accurate

• An error

• Resolution

A quality denoting the closeness of agreement (consistency) between values obtained by repeated measurement. It is influenced by random effects and can be expressed numerically.

• Repeatability

• Precision

• Uncertainty

• Resolution

Any measurement will have some ____________. This will come from variation in the data obtained and be subject to systematic or random effects. This can be estimated by considering the instruments and the method and will usually be expressed as a range such as 20 ± 2 °C.

• Error

• Precision

• Reproducibility

• Uncertainty

The first length measured in a laboratory experiment is 2.5 + 0.1 m and the second length 3.4 + 0.1 m. What is the uncertainty of the difference in the lengths?

• 0.1 m

• 0.2 m

• 0.3 m

• 0.4 m

True or False?

Repeating a reading never removes the systematic error.

• True

• False

When you multiply or divide two quantities, you...

• add the percentage uncertainties

• subtract the percentage uncertainties

• add the absolute uncertainties

Which best describes the target?

• Precise, but not accurate

• Accurate but not precise

• Precise and accurate

• Neither accurate nor precise

Tags

NGSS.HS-PS3-2

A student uses a different balance for the third trial of their experiment. This would be an example of:

• random error

• systematic error

Zero error of vernier calipers is an example of

• systematic error

• random error