True or False: The number 0.00456 has four significant figures.

False. It has three significant figures (4, 5, and 6).

Fill in the blank: The order of magnitude of a quantity is the ___ required to represent that quantity.

Power of 10

Riddle: I can be measured but not seen, I tell you how precise and accurate your measurements might be. What am I?

Error

What is the least count of a measuring instrument?

The smallest value of a physical quantity that can be measured accurately with the instrument.

True or False: Exact numbers have a finite number of significant figures.

False. Exact numbers have an infinite number of significant figures.

What does the term 'precision' refer to in measurement?

The degree to which repeated measurements under the same conditions yield the same result.

Fill in the blank: The difference between the true value and the measured value is known as the ___ in measurement.

Error

How do you calculate the relative error in a measurement?

Relative error = Mean absolute error / Mean value