Measurements & Uncertainty

Some wooden rulers do not start with 0 at the edge, but have it set on a few millimeters. How could this improve the accuracy of the ruler?

• There is a manufacturing error that makes the ruler to not begin with 0

• Ruler get worn out.The end of the ruler is difficult to align with the edge of an object to be measured. This ensures higher accuracy for the result.

• It cannot improve the accuracy because it is difficult to locate the 0 on the ruler.

You find a micrometer that has been badly bent. How would it compare to a new, high-quality meter stick in terms of precision? Its accuracy?

• The precision is affected by the accuracy remains the same

• The accuracy is affected because the micrometre is bent. The precision is also affected.

• The accuracy is affected because the micrometre is bent. The precision is not affected.

• The precision and the accuracy stay the same.

Does parallax affect the precision of a measurement that you make? Explain.

• Parallax does not affect precision because precision is related to how exact a device can be. However, parallax affects accuracy.

• Parallax does affect precision because it does not allow the reading to be done correctly of the measurement.

• Parallax does not affect precision because accuracy is not affected as well.

• Parallax does affect precision because accuracy is affected as well.