Matching
|
|
|
Match each item with the correct statement below. a. | absolute
zero | e. | mass | b. | Kelvin temperature scale | f. | significant figure | c. | Celsius
temperature scale | g. | precision | d. | weight | h. | accuracy | | | | |
|
|
|
1.
|
closeness to true value
|
|
|
2.
|
narrowness of range of measurements
|
Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
|
|
|
3.
|
The
closeness of a measurement to its true value is a measure of its ____. a. | precision | c. | reproducibility | b. | accuracy | d. | usefulness | | | | |
|
|
|
4.
|
Which
of the following measurements contains two significant figures? a. | 0.004 00
L | c. | 0.000 44
L | b. | 0.004 04
L | d. | 0.004 40
L | | | | |
|
|
|
5.
|
When
a test instrument is calibrated, does its accuracy, precision, or reliability
improve? a. | precision | c. | reliability | b. | accuracy | d. | all of the above | | | | |
|
|
|
6.
|
Which
of the following measurements (of different masses) is the most accurate? a. | 3.1000
g | c. | 3.122 22
g | b. | 3.100 00
g | d. | 3.000 000
g | | | | |
|
|
|
7.
|
Which
group of measurements is the most precise? (Each group of measurements is for a different
object.) a. | 2 g, 3 g, 4
g | c. | 2 g, 2.5 g, 3
g | b. | 2.0 g, 3.0 g,
4.0 g | d. | 1 g, 3 g, 5
g | | | | |
|
|
|
8.
|
Three
different people weigh a standard mass of 2.00 g on the same balance. Each person obtains a reading
of 7.32 g for the mass of the standard. These results imply that the balance that was used is
____. a. | accurate | c. | accurate and
precise | b. | precise | d. | neither accurate nor precise | | | | |
|
|
|
9.
|
Which
of the following measurements is expressed to three significant figures? a. | 0.007
m | c. | 7.30  10
km | b. | 7077
mg | d. | 0.070
mm | | | | |
|
Essay
|
|
|
10.
|
Explain the difference between precision and accuracy. Suppose you made three
different mass measurements of a sugar sample you knew to have a mass of 1 g. How would you know
whether or not the measurements were accurate? How would you know whether or not they were precise?
Could the three measurements be precise, but not accurate? Explain.
|